2008 Buick Lucerne Misfire SOLVED!!!
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- Опубликовано: 30 сен 2024
- Today we are working on a 2008 Buick Lucerne, GM 3.8 Series III. The customer stated that as soon as she went to start it up that morning, it was misfiring right away. Tune in to find out the cause and watch as we solve the issue!
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#buick #lucerne #3800 #mechanic #misfire #autotechnician #problemsolved #dtc #P0300 #v6 #spark #ignitioncoil
I had bad module AND bad coils. Cost me a pretty penny.
Once you've seen this, you'll never forget it. On those engines to check for bad equipment take all the boots off the coils and tie them back so they don't get in the way. Then crank it over. If it's good you'll get a hot spark between each coil post and if it's bad, you won't. All six shoot insane fire and make quite the display. Here, the top one would not do as good as the bottom two and even with swapped out coils it would have been the same story. Good idea to replace the consumables as that's how it is supposed to be done. They will work with a 180 degree thermostat which keeps my summer temps from reaching on over 200 regularly like it used to do without complaining about it on the OBD system. But it does mean a bit less heat in the polar vortex days. Mines a 97 series II, must of had a leaky injector while eating lunch with the radio which required some ignition key on and offs to keep it alive. When I started it back up finally, it misfired quite a bit and threw the MIL on me. Great now I got to go find my code reader to clear it. Next day I fired it back up to go get the mail and it wasn't on anymore - at least mine will clear itself if the issue doesn't persist. On the other hand, I had to go to town once with the space saver spare tire on and picked up a check tire pressure nag text in the instrument panel, that one never went away until I had to pull the battery to recharge it when it wouldn't start in the above polar vortex. So disconnect the battery for that one, and I still have to find my code reader.
I like your root cause diagnosis to many people are cherry pickers.
Thank you
My mom's 2005 LaCrosse 3.8L had the ignition module fail - TWICE within 5000 miles. It also led to a premature failure of the catalytic converters so those had to be replaced. So far it has been running fine.
Parts today! Bummer when that happens, especially wiping out the convertors.
I didn’t no Oliver Anthony worked on cars too. Lmao jk jk good video man thank you.
I have the same exact car. When I first start it up it’ll do the same exact thing, the rpm’s will drop for a few seconds then rev up to normal idle. I replaced the gas pump thinking it was that but still getting the same response. Could be bad spark plugs? I’m not getting any check engine light on.
It's possible. Do you have access to a scan tool with live data?
@@andersonsgarage2334I have a scan tool but not access to live data.
What brand of diagnostic scan tool are you using? I had a hard one on a Mitsubishi 2.4 L engine. The EGR and CAT monitors would not set (no fault codes). Up stream O2 sensor going crazy trying to compensate for air leak somewhere on the intake side. Smoke test revealed TB throttle shaft leaking. Replaced throttle shaft seals. Did not work. Went to junk yard got another TB, and replaced shaft seals. FIXED. Apparently the original TB throttle shaft bore was worn out, and sucking air.
I never would have thought of the shaft seals. A smoke machine definitely reveals some things when diagnosing a problem. Its an xtool D8 pro. We have been thinking of making an in depth review on it. Would that be something you are interested in seeing? Thanks for watching btw.
In the series I AND II 3.8 you are supposed to change the plugs every 30,000 miles. It fires the plugs twice because it has a waste spark which fires on the exhaust side. 140,000 miles is a lot of miles for plugs on a 3.8L.
I agree. That's why we replaced the plugs.
@@andersonsgarage2334 The comment wasn't directed at you. I know you changed them. I was commenting so readers would know this wasn't a regular engine with 140,000 that still needed plugs changed. This was a car that previous owners were incredibly stupid about taking care of their car.
@altg5708 I apologize if my reply sounded obtuse and I do appreciate your comment. I took it exactly how you intended and agree with you.
Thank you. Just bought a 2009 Allure, 3.8L, at mechanic now. Will have him check, has 70,500 mikes in it. @@altg5708
You mean you got the spark plug boot off without damaging it? That’s a first for a AC Delco! 😂
I have a 3800 and LOVE it! Supercharged!!!
My 2009 shot out smoke while on the highway, and died.
I now own my third Buick Wildcat (ex-Lucerne). The cars look great with the mid-1960s metal emblems.
a bad plug or wire can ruin a ignition control module? wow!
Great video. I had a coil fail last fall. It was cracked. Replaced all the coils and spark plugs. And the car has been great until today. Started getting a misfire. Started with a blinking check engine light. Then it stayed on. Cylinder 2 is what my cheap code reader said po302. I removed the spark plug, and it looked fine. Swapped with #1 plug to see if it followed the plug. Took it for a drive 4 mile drive, still misfiring. But the code is po300. Maybe it hasnt settled into cylinder fault yet. Any suggestions?
Swap coils and see if the misfire follows? Could be the ignition module.
Did the check engine light come on alering you to the misfire and and ignition module problem?
Correct. The check engine light was illuminated. However the dtc was P0300 multiple cylinder misfire. It wasn't until I watched the data that we narrowed down which cylinders were misfiring.
Forgive my not understanding, but the fact that the ignition module was the ultimate problem, had to be discovered by your own investigation. There’s no tell that, the actual issue was the ignition module?
@@frederickbehn5610 that's what the video was about. Moved the coil and the misfire did NOT follow the coil, which means the module failed.
Great job! Will enjoy more vids..
Hey, thank you for watching and thank you for the feedback.
Any ideas for my Buick Lucerne 3.8 series 3, i am replacing my knock sensors but the auto shop charges $700.... So was wondering if you know how to do it yourself
There's a lot of videos covering knock sensors on the 3.8. Search here on RUclips.
Nope can't find a series 3 V6
Always a series 2 V6 and when I find a series 3 V6 they don't tell you how to replace the knock sensors they only show the location. Some people say you can do it at home and some people say I need a auto shop lol
Nice job of isolating the problem. Bravo.
Thank you
GREAT VIDEO
Thank you
I replaced my oil sensor on my 07 Buick Lucerne 3.8 but the message center still says add oil low on fluid.... Do I have to reset the oil sensor??
My car ran cooler, gave me coolant too cool code. About a week of this and she got harder to start. Today was cool damp morning. Poof, multicylinder misfire. Thermostat killed the ignition module. She has to run 177 or higher. 2006 buick lacrosse with 59,000 miles. 18 years old but driven very little. Lesson learned.
Interesting to learn.
Thank you
I have an 02 buick century and I bought an ignition module that wasn't gm original equipment got it for under a hundred bucks and I'm throwing the P0300 code I've changed plugs wires iac tps coils throttle body fuel pump and filter purge valve and maybe this might be my issue I don't know for sure but I hate P0300 it's a freaking headache
@@NoLiesToldTV it certainly could be a step in the right direction. Sometimes the aftermarket modules don't work correctly.
@andersonsgarage2334 I sure hope so man!
@@NoLiesToldTV come back here if not
@andersonsgarage2334 cool I appreciate that man!
I have a green wire hanging under my front bumper (2008 Buick Lucerne) I’m guessing it’s a sensor but I have no clue where it goes and am I able to connect it myself?
Could the icm cause a stutter when pulling off from a dead stop or cause the engine to start and then die on come start
I bought a 06 lacerne which dies after it is warmed up not sure what causes it l
Sometimes ignition modules fail when they get hot.
How is the catalytic converter doing after all that misfiring
15000 miles later and no catalyst efficiency codes so I would say it's fine.
Would it be possible he module would prevent the car from starting at all? My mother in law's car won't start snd ive went through the list. I removed the number one spark plug and tested spark the same way you did and there was nothing. HOWEVER when I put the plug on a ground point on the frame it sparked and the car started.
Spark plug needs a ground to make the spark, if it sparks on the frame and not the engine , check the engine to frame ground wire. Should be as thick as you`re little finger.Can look ok but be broken inside.
Could be fuel pump relay. My mom's burnt 2 out. Ended up being the whole fuse box under back seat was bad. Caused by the seat latch pushes against it and burns up the socket the fuel pump relay goes.
Too expensive.
Too expensive...for?
3800 runs forever.
Absolutely. Much better than 3.6
My 06 buick lucerne cxl has a misfire also and I changed the plugs and wires and it drives 85%better and I cnt get the check engine light to come on or flash like before but there is still a little miss there I can feel it..could i have the same problem???
It's very possible. What brand of spark plugs did you use? Unfortunately all spark plugs are not created equal. Do you have access to a scan tool where you can see the live misfire data?
@Anderson's Garage I believe they were ac Delco iridium spark plugs..And no I dnt have that tool..ive been chasing this problem for weeks now and it jus been a head ache
@@cali8221 AC Delco plugs are good. It's really hard to say without scan tool data. Around here a used set of coils and module is about $40 at the junkyard. Maybe it would be worth swapping a used set in and seeing if it goes away
You could also check the resistance of your coils with the multimeter.
@@andersonsgarage2334 ok thanks