Pickup Tube Goes Back On (GM 4.2L Oil Pickup Tube Removal - Part 3)
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- Опубликовано: 10 фев 2025
- Pickup Tube Goes Back On (GM 4.2L Oil Pickup Tube Removal - Part 3)
In this Part 3 video, I start putting things back together! Hope this is helpful to you. Stay tuned for future installments.
After an initial diagnosis of low oil pressure with a manual pressure gauge in my 2004 GMC Envoy (~255,000 miles), I decided to investigate the oil pickup tube. Come to find out, it was about 90% clogged! This is how I fixed it.
GM 89017622 Crankshaft Oil Seal (Front)
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How to Remove Oil Pickup Tube GM 4.2L - Part 1
• How to Remove Oil Pick...
I Broke My Oil Pan (GM 4.2L Oil Pickup Tube Removal - Part 2)
• I Broke My Oil Pan (GM...
Diagnosing Envoy Low Oil Pressure Part 1
• DIAGNOSING ENVOY/TRAIL...
Diagnosing Envoy Low Oil Pressure Part 2
• Diagnosing Envoy Low O...
Diagnosing Envoy Low Oil Pressure Part 3
• Diagnosing Envoy Low O...
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Thanks for the videos!
I have a small coolant leak coming from a bolt on the timing cover but not enough to cause a puddle. This video really helps as it show the inner structure of the timing cover and engine.
I'd say this job is a 6.8 out of 10.
Very labor intense
Having the GM repair manual is a PLUS
Great video! TY for the whole oil pressure series.
Thank you👍
2-5-2020 UDPDATE and RESOLUTION for the low/no oil pressure at idle and turn engine off light on car panel ! Refresher from the notes below thread added by me 1-3-2020 . This is for 2005 Envoy 156,000 miles, 4.2L
++++++Review date 1-3-2020 Here’s what was done PRIOR to the hail-mary GUNK attempt.:
- Put engine cleaner in oil drove about 20 miles,
- Drained oil installed new engine oil pressure sensor,
- Changed the oil & filter,
- Still no oil pressure at idle indicated on car display panel:
Here’s what we did:
1-12-2020
- Used GUNK carb cleaner all 96 oz in the can ($27 @ pep boys) carefully poured down dipstick tube
- Let set for 36 hours and rocked car occasionally
- Drained and measured amount of GUNK we put in it was very close to all of it and not really dirty
- Refilled with fresh oil but no filter this time as it had less than 80 miles on it. We wanted to see if low oil pressure was resolved first. Because if it worked we were going to drain the cheap oil and put new filter and all synthetic oil in.
- Unfortunately it did not fix the low oil pressure indicator on car panel
Fast forward to last week 1 -27-2020
My mechanic buddy attached a real oil pressure gauge next to oil filter and drove it to confirm there was actually real oil pressure in the proper range and there was and right on spec. So he then checked with his sources and was told to test the EMC control for voltage. He flashed the EMC a couple times it stayed at 12 volts it was to be at 5 volts, We replaced the EMC computer control and VOILA no more false drop of oil pressure indicator. I have now driven it 250 plus miles and all is well. I wanted to share this as it made my day finally getting it resolved and NOT having to drop oil pan and all the work associated with that! Thanks to Kevin and everyone else who posts on youtube to share their help!
Hello Greg. Thank you for providing a detailed diagnosis in trying to get this problem sorted out. Can you please elaborate what the EMC is? I have a 2005 Trailblazer with 137k miles and scarily enough, I am traveling the same rabbit hole. From what you mentioned, your approach might have been a little less expensive? Please let me know. Really appreciate your help. Thank you.
I have heard of people pouring the gallon of parts cleaner into the motor after draining the oil course. They left it for two days and drained it. Then, they ran the old oil through it so it pushes the parts cleaner out. Next, refilled it with fresh oil + filter and it solved the problem. Has anyone mentioned this to you after you did the job and if so what have you heard. I consider myself good at working on cars but man, this seems like this would be a quick easy fix.
Sorry, I just found a post from Paul that answered my question. The Gary gentleman didn’t say what his oil pressure was afterwards but he did say that it worked. Thank you for posting these videos by the way. That was a heavy job and it took a lot of commitment to film it.
Several people have mentioned this. Had I thought about this, I probably would have tried it. If I were to attempt this approach, I would pour the parts cleaner in the dipstick tube, let set, and drain out. I wouldn't pour the cleaner through the valve cover, and certainty wouldn't crank the motor with a gallon of parts cleaner in the oil pan.
Kevin Nadeau here is an update. I put gunk carburetor cleaner down the dipstick and was still getting a low oil pressure warning. I sucked it up and bought an oil pressure test kit. When I hooked it up I was actually getting low oil pressure. Obsessed with the idea of a clogged pickup tube, I drilled a hole in the oil pan because I didn’t want to go through the fiasco to remove it. The pick up tube was clean as a whistle. So, the gunk trick down the dipstick works. I am leaning towards the oil pump being bad. Looks like I am going to have to go through the hassle that you went through. I am stuck at home from the coronavirus like everyone else. Looks like I’ll have time to do the job. Would you consider selling me one of your harmonic balancer tools? Thanks for your time man, and I really appreciate the time you spent to film this job.
@@Mitchc0nner Thanks for the update! I appreciate your time to reply. Good luck with the job. I'll be doing a timing chain replacement on a 2007 Cadillac CTS this weekend. Another fun project.
Kevin Nadeau Sounds like fun. Would you be willing to sell me one of those harmonic balancer tools that you fabricated?
I'm glad you ended up with a new oil pump, they do fail and it would be false economy not to change it this deep into the engine.
Eric Corse Agreed. It was a blessing in disguise I guess.
@@KevinNadeau Yeah, considering how many miles were on your vehicle already at just over 250,000, It was definitely a good idea even if it wasn't necessary. But also, considering what the other person said and how much you were already into as far as the removal of components from the engine, it wouldn't make sense to not do it. With all the debris in the oil pickup tube, It was probably damn near necessary. Better safe than sorry and with them only being about $75 brand new online, you really can't afford not to do it.
Question
Have you ever remove the freeze plugs on a your vehicle the ones by the exhaust manifold, I can’t seem to find them no where
No I have not
I am completely rebuilding my 4.2. Question: did you have to take the sprockets off the camshafts when changing the chain? Were you able to re-use the camshaft sprocket bolts?
I didn’t change my timing chain on this job.
Hello me again
Did you also remove the crankshaft timing sprocket?? If so what did you use to remove it??
I didn’t remove that on mine
Do u think i have the same problem could i take the oil out of the pan and put gasoline in the pan and force clraner down the oil tube to clean it out
It's possible you may the same issue. I think if I had to do this job over again, I would start by draining the oil and putting parts cleaner in the pan to try and unclog the pickup tube. But no guarantees it would work though. I would probably try a bore scope to see if the pick up tube is actually clogged. And if you haven't done so already, hook up a manual pressure gauge to check your oil pressure.
@@KevinNadeau yea thats what i wanna do
Ive got it tore down to the timin chain
@ 15 min mark is the point I sifted thru hours of your videos to see... I didn't see the actual removal earlier on. Just the mention that it was done...
Thank you for taking the time to make this video, I am about to replace the valve cover gasket on my 2002 GMC Envoy and I have found your videos to be extremely helpful. I do have a question and although it is not related to what you are showing us here. In 5:02 there is a green cover on the bottom and in the middle of the screen. It is next to where the PCM should be and I was wondering if you can tell me what's that line for?
dmel193 I'm glad the video was helpful. The green cap is for the evaporative emission (EVAP) service port. The EVAP control system limits fuel vapors from escaping into the atmosphere.
1-3-2020 Happy New Year & Friday! ...and a BIG Thank You Kevin for this series of posts on your low oil pressure journey! If you would be so kind I have a couple of questions for you please - 1.) is your Envoy pressure good still (hopefully it is) >... and 2.) how did the top look as far as sludge/build up? I saw the cleaned up version here but was not able to see it when you pulled the cover off initially.
My 05 Envoy 4.2L, 156,000 miles, exact same issue as yours, once warmed up and stop at idle, oil pressure drops then the warning to stop engine. I did an engine flush thenan oil change and filter, it helped briefly 80 miles or so and then same issue. I am about to also enjoy this same journey (not ) and replace the oil pickup tube and will also check and clean the top end too. I was pretty surprised that this happened as I am adamant on changing oil and yes using good filters and oil. From watching you I can guess that you also did the same care. I love my Envoy and hope to chase your 300k! Thanks again! Greg
Hi Greg, Happy New Year! I'm glad my videos are helpful. After about 2 years now, my oil pressure is still good. What you saw on the top side (cams, etc) was what they looked like when I pulled the valve cover. I cleaned out the intake ports, but that about it. There was a little bit of buildup around the valve cover matting surface that I vacuumed out, but other than than, I didn't clean it out.
I am pretty diligent about changing my oil and filter. I use 10W-30 full synthetic with AC Delco filters. My I make a suggestion before you dive into the motor, try this...drain the oil and pour about 3-4 quarts of carb cleaner down the oil dipstick tube right into the pan. Let it soak the pick up tube for a little while (maybe 35-45 min) then drain. Fill with oil and see if that helps. Id likely do another oil change after about 20-30 miles, to make sure the cleaner is out. You could also try an inexpensive bore scope to confirm this worked.
Let me know how you make out. And good luck.
@@KevinNadeau I will try this. Thanks for the suggestion I will post here what happens. Not able to do this for a couple days.
@@KevinNadeau 1-12-2020 Update on the infamous low oil pressure gauge and the stop engine warning on my 2005 Envoy 4.2L 156,000 miles.
Background- mind you I have been diligent on changing oil and filters since I purchased used in 2006. It had 19,000 miles on it when I bought it. NO problems until now. Usual maintenance, I changed the plugs at 100k, had to do the brakes a couple times, 3 sets of tires and took off and cleaned throttle body several times, Did the water pump , serpentine belt and a transmission service with a new filter two months ago before my last leg of road trip. It’s really been a good vehicle overall. I had driven about 8,500 miles over the past 5 months with no sign of a problem no oil leaks, not burning any oil. No knocks, quiet engine, and getting 20mpg on the highway.
So now 10 days ago or so the low oil warning stop engine comes on at idle when the car has been driven approximately 12 or so miles. Since I found this post from Kevin last week and seeing some other comments I thought I would try the GUNK down the dipstick process. I hate to say it but it did not resolve the low oil pressure.
Here’s what was done PRIOR to the hail-mary GUNK attempt.
- Put engine cleaner in oil drove about 20 miles,
- Drained oil installed new engine oil pressure sensor,
- Changed the oil & filter,
My mechanic drove it for 6 miles, brought it back to shop and let it idle for 15 minutes. No problem (so we thought) he called me and said ready come pick it up. I picked it up less than an hour later we said cross our fingers hopefully resolved. Drove about 8 miles to my house and when I stopped in front of my garage door…..yup low oil pressure warning & light as well as stop engine warning back on!
So we thought we would try the GUNK hail-mary carb cleaner to see if it might fix the oil pressure as maybe the oil pickup tube was clogged- sadly it did not resolve the low pressure issue. Here’s what we did:
- Used GUNK carb cleaner all 96 oz in the can ($27 @ pep boys) carefully poured down dipstick tube
- Let set for 36 hours and rocked car occasionally
- Drained and measured amount of GUNK we put in it was very close to all of it and not really dirty
- Refilled with fresh oil but no filter this time as it had less than 80 miles on it. We wanted to see if low oil pressure was resolved first. Because if it worked we were going to drain the cheap oil and put new filter and all synthetic oil in.
- Unfortunately it did not fix the low oil pressure
NOTE: when we changed oil the first time it was clean and could not see anything in it but if you rubbed the oil between your fingers you could feel very faintly a smattering of very fine particles here and there of some sort but you could not see anything with your eye.
Not sure of my next steps for my Envoy at this time but it points to the main bearings uggggghhhhh. It may be time to put it out to pasture. As much as I don’t want to it may be time.
I welcome any thoughts or ideas. In meantime I am looking at getting a new/used vehicle and I hope this post helps as much as Kevin’s helped me.
Thanks to all those who take time to post their work on youtube!
@@gregrussell4189 Sorry to hear this man!
I watched your other videos showing how you accidentally broke the oil pan, but I couldn't find where you showed how you broke the front timing cover? I looked in one video and it showed you getting it off and I even paused it when you turned the front timing cover Immediately after you removed it from the engine. so we could see the oil pan rail side, and I don't see any damage. So what did you end up accidentally doing that caused it to be broken?
There is an allen screw at the bottom of the oil pump that I tried to take out. It's right near the gasket mating surface. When I tried to unscrew it, I broke the flat surface that mates with the oil pan. Cost me about $160 ☹ that I wasn't planning to spend.
@@KevinNadeau bummer. Did you damage the flat surface because you accidentally slipped and hit the timing cover or was the bolt stuck to the point you couldn't get it loose and it broke the cover or something else?
Sorry for the questions, but I'm just trying to get an idea because I think I'm going to end up having to do the exact same thing to my parents vehicle So I'm just wondering if there is some secret hiding place for a bolt that you weren't aware of or if it takes a special tool or something else just so I know ahead of time.
I just changed the oil in my parents' 2002 Trailblazer and when it warms up, it has low oil pressure (been doing this for a little while now) so, I'm going to do some diagnosis and connect a gauge directly to the oil pressure sensor port like you did but, I'm assuming I'm going to have to remove the pan and do some cleaning just like many other people have been doing (and you obviously).
I'm assuming I'm also going to have to change the oil pump unfortunately. Guess I will see. Wasn't looking forward to this even though I work on cars regularly.
Just a suggestion so you can do things in the future. I would recommend to use a number of different wire wheel brushes with a drill. I don't know why more people don't use these because they are actually very low as far as abrasiveness and don't damage the mating surfaces like abrasive wheels or sanding discs do that a lot of people use.
I've always used wire brushes on a drill and never had any issues with damaging parts or engine components.. This is something that you could have used in the intake ports of this engine as well and it would have cleaned the intake ports quite well. Or, you could have used a Dremel type of rotary drill with. a wire brush on it as well.
Keep in mind that you could have done that and then simply use the shopvac to try and vacuum out any potential debris that got inside the intake ports.
Also, keep in mind that even if you do get a little bit of debris in the ports, unless it's something extremely major, It's going to go right through the exhaust and not typically cause a problem with the engine.
Sure, there are horror stories of people that have bent a valve when they have got debris inside the engine, but that's typically when it is something pretty major like a small or larger piece of metal.
Keep in mind that you already have carbon deposits in the engine as it is already. So, what do you think would happen if a few of those carbon deposits loosened up and decided to go through the engine? Where do they go? They simply go through the engine and out the exhaust like any other carbon deposit.
So, if you were to take a wire brush on a wheel connected to a drill to the carbon deposits on the intake side and loosen them up, it wouldn't be the end of the world if you couldn't get every single piece of debris vacuumed out.
Just something to consider.
Or, you could maybe get a really small tube or fuel hose and duct tape it to your vacuum cleaner and then put it down in the intake ports to make sure you got as much vacuumed out as possible.
Wire wheel brushes connected to a drill or other rotary tool are one of the best ways to remove gasket material from an engine or cylinder heads and other parts and not cause any damage to the surfaces. That's been my experience. Anyway. I have never likes using the abrasive discs or anything because they take too much material off.
Muchas gracias me sirvió mucho el video
Hey Kev. I have 02 trailblazer 8th digit is S. Just took cover off has the old style cover with beveled end. I already ordered and have new style. Can I use new style and if yes is do they sell a new styles pickup tube.
I would think you can, but I'm not 100% sure. Maybe check some of the forums like TrailVoy and GMTNation.
I’m thinking u can just called dealership old style pump and cover can’t even buy. Even rockauto and other parts store sell new style pump. Thnx for reply
Kevin Nadeau
Hey Kev I saw you installed the new design front cover. Did your truck have 2nd design balancer as well. Do you know off hand if old design balancer will work with new design front cover?
@@cobblv Yes my truck has the new design balancer. I'm not sure if they are compatible, I would guess no, but don't quote me on that.
Hello Kevin why does the small 7mm front cover bolt need to be installed last.? My Chilton's book didn't specify that and I didn't do this last so I was wondering.
I'm not sure why, but that's what my shop manual says to do.
Please provide a link to the vehicle catalog book you used in this video for me. Thank you in advance
A quick Google search found this...diyrepairmanuals.com/product/2004-gmc-envoy-service-manual/?gclid=Cj0KCQjw6575BRCQARIsAMp-ksNAUwactVp8MHBklzRpkz6Ucfy16MKpDEqh8emgadxAXhzJKlmriwsaAgC9EALw_wcB
Its a little pricey. Maybe check ebay too.
I have a 2005 and the oil gauge is going to zero and i ran it till it started to make horrible noises but it still runs is it blowed or i changed the oil and it still runs but when it get to temp the gauge still falls to zero and it starts makin knockin sounds did i scar the baring or can it be saved what is wrong with it please contact me soon
I would check the oil pressure with a mechanical gauge to confirm your actual pressure. If its making noises, I would drive it as little as possible.
@@KevinNadeau im not but can thw motor be saved or what shoukd i do
You have to take it apart and see what is causing the noise or just buy another engine
Would it have been easier to pull the motor?
😁 probably 👍
How do you line the timing cover up to the sprocket
Kevin. Can the Gunk Parts Cleaner be use when an oil change is done? Do you think the Gunk parts cleaner can just be add after draining the oil to disolve the gunk on the pick up tube, then drian out the Gunk Cleaner and finally do the oil change and filter? What do you think about this method to avoid all that work for people less mechanically inclined.
Paul I think it's a pretty good idea. Someone else mentioned this in another comment. I would pour it through the dipstick tube. Let me know how it works out for you.
Kevin Nadeau Ok. How much Gunk Parts Cleaner should I put in the oil pan so that the level doesn't go so high the it damaged the oil Pan's gasket. I would like to put enough to get to the pick up tube and dissolve the sludge
Paul I just went back and watched my Part 2 video and the pickup tube is closer to the bottom of the pan than I thought. I'd probably start with 2-3 qts of Gunk.
Kevin Nadeau . I try that as preventive maintenance on my 2003 Envoy 4.2 engine. I will keep you posted do we can help others.
Kevin IT WORKED. After watching the series got thinking about exactly the comment Paul said above. First some base line measurements. This 02 Envoy would get the low oil pressure warning after a couple of minutes of driving. Pressure gauge installed, start up cold about 35psi as the engine warmed pressure dropped quickly to under 10psi. At first reving the engine did push the pressure back up, the more driving I did that stopped happening and stayed under 10psi the whole time. Now your VVT works on oil pressure a code for the valve timing was set in memory. FIX I purchased a can on Gunk Parts Cleaner / basket, warmed the engine up (getting base readings) drained all oil from the pan. Using a funnel and a rubber hose I poured the whole contents of the Gunk can (about 3 qt) down the dip stick tube. Don't want it to touch any seals or gaskets. Left it sit in there for 2 days, then drained it back into the can. The cleaner was notably darker. let that drip for a bit. Then flushed 2 quarts of trans fluid
Thanks my Trailblazer 2003 neither.
Can i ask u some questuons about my trailblazer
Hey body one question does it have oil level sensor?
The '04 and newer do not have an oil level sensor. Some '03s had them, and '02s and earlier did as well.
So, after all is said and done, do you have a list of which parts, gaskets, seals etc had to be replaced in order to clean the oil pickup tube and replace the chain guides? I’m about to start the exact same repair on my 04 Envoy! Anything you would suggest replacing whilst I’m in there?
Brad R. I haven't put together a list yet, but I plan on doing another video with a parts list and cost breakdown. Be sure you have the correct balancer puller and installer.
I dont wanna take all that off
🤣🤣
Ok thank you Kevin.
P.S. (Also) The music audio being 10 times louder than the working audio is annoying as F...