How to set the base idle on a TBI Chevy or GM v8
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- Опубликовано: 13 июл 2024
- In this video, I will show you how to set the base idle for your Chevy or GM V8 engine. This will apply mostly to 1987-1998 vehicles
with Throttle Body Injection TBI.
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Thank you sir, it is videos like this that help me keep my 1995 2 door tahoe on the road with 299,000 miles
What are you setting the multimeter at to get those calculations
I had the same issue, i replaced my original from amazon and it was accelerated for about 2500rpm. I also replace the tps sensor and had a terrible time finding the issue. I removed the cap to adjust the screw and big big mistake to mess with that. I did brought the acceleration down but not the right way. Cold starts was weak and wanting to stall so i would adjust the screw again and will not get it right. To my surprise, the idle control valve was the PROBLEM since was new i never thought it would be defective. I took it to the shop and explained them what I did and they laughed when i told them i adjusted the screw for the throttle body. They told me it was sealed for a reason and it should not be altered. So they charged me 60 dollars to hook it up to a scanner and it indicated that my problem was the NEW idle control valve. I told them its new and i just replaced it. He said it was bad, so i purchased another one and a used throttle body from ebay and i rebuilded it with new gaskets and cleaned really good. I also installed the injector spacer to raise the injectors to add more air in. Installed the new idle control valve and wow was running like it should. Like a new truck. I had a very long weekend figuring this out and finally I could have a beer relaxing and admiring my work😅
Thank you! I've been needing that info. For a long time now.
This could have been phenomenal.......if you had shown us what you did to hook up the meter......and what settings you used...........dammit man
The coil has tach on it. Power and tach harness
Very good informative video. I need to do this to mine. Thanks!!!!
Thanks. I was going to adjust mine unlike an old carburetor. Good info
Thank you! No more high idle problem on my 1989 Chevrolet Suburban!
Thanks for your video. I heave the same problem with my 91 Chevy Caprice, 305 cui 👍
Worked great. Thanks brotha.
Thanks so much I needed this video
This is the most helpful video I have ever seen . I have 88 c1500 with the same motor. And I have replaced fuel pump , filter and all and could not for the life of me figur out my high idle. Thank you so much
did you vehicle rise and lower , the revs
hate to break the news but what u replaced
have ZER0 to do with
high idle. fuel pump
replacement is tough.
Sorry Russel -Replaced the IAC on my 1992-K1500. The manual says : after installing the AIC and connecting the plug- in . #1- turn on key to On (do not start ) for 10 seconds. #2 turn key Off for 10 seconds #3 Start motor ,let idle for 5 minutes. #4 Turn motor Off for 30 seconds. #5 Restart motor and observe idle operation (rpm ) .I did this and now it,s idling at app. 600 rpm ( on dash tach. ) Couldn,t get passed 115kph ( app. 70 mph ) before ,without surging and power loss. Now i,m easily getting there and more , plus much stronger pulling .I,m anticipating better fuel economy as well. Oh yes, I did change the MAP sensor as well ,since everything is over 30 yrs. old. This time I trusted the manual and it worked. I,m happy. We both love this truck
@@cecilsabourin9462that didn’t do shiiiii😂
Thanks man , I had no idea , I was looking for vac leaks
Excellent help thanks
Where do you connect the multimeter to get that reading
Thanks for the video. Just got a 97 c50 1500 Silverado and love this truck.
Yeah because it's either avortec 4300, L31 vortec 5700 or 5000 without tbi but cpfi.
Nice bro i just got an 80 el camino, i love this truck myself 😅
Where do you plug the meter for rpms
yeah wth lol
TBI is from 1987 to 1995. TBI means Throttle BODY Injection, not Throttle BORE Injection. Thanks for the video.
When you start the vehicle after removing the electrical plug on the IAC do you leave the jumper on the AB port or remove it to set the idle before restarting the engine? Thanks
not splitting hairs, but throttle BODY injection. =) thanks for posting.
thanks for the info
Nice job
Where was the meter hooked up to? Also, what did you do with the torque screw?
That’s what I’m saying 😩😩
right smh
Helpful
Ok what did you hook that meter up to so you can get them readings
I want to get a little more detailed with my comment below. My idle was well over 2000rpm on my 87 C20 when I bought it from the prior owner. He replaced all the sensors including the IAC. I tried the reset with the paper- clip described in the video and this worked well for about 2 minutes. I then checked for a vacuum leak for several hours and found nothing. With the engine off I rotated the ICA plug-in 1/4 turn to see what would happen. The idle dropped by about 1/2 (still high but better). I rotated it back, the idle was way high again. I then decided to rotate it 1/2 turn, this fixed the problem the idle has been perfect for 3 days and about 100 miles. Hopefully, this is a long-term fix and not a fluke. I could not find anything that says the IAC valve plug adjusts the idle but it worked for me. so before you start spraying carb cleaner all over your top end and sticking paper clips in your computer try rotating the IAC plug. every 1/4 turn changed the idle.
Turbo Broccoli Injector
😂😂😂
@@tjtj3027 😮0
Yes
Did you pull out the paper clip before you started it? And did you leave the IAC unplugged when and you adjusted the idle (torcks) ? And did you adjust it also while running?
I installed a new IAC. It says needs calibration I didn't do any calibration. Just installed it. Should I use this method to calibrate the new one.y idle is too high. I was having problems with stalling and erratic idle and stalling. Now it just idles too high. If really appreciate any help you can give me
Did this changed the throttle body to a new one with new fuel injectors new iac new tps new fuel pump new fuel filter also battery. I tried to bring it down to number 7 on the tachometer and if I go that low the truck stalls out
an alright video so many steps left out to really make a true repair without more knowledge before hand.
Was the multimeter hooked to the IAC or o2 sensor to read voltage?
Where do you hook the VOM to? Did you remove the Jumper when you checked the Idle Speed with the IAC Valve unplugged?
I have an idea now on how to adjust the idling on my truck. It was actually not wanting to Idle so I will try this. I just replaced the Idler Control. Thank you, I will let you know how it turns out!
I rotated the plug that goes into the ACI 1/4 turn idle dropped slightly. Rotated it again and it sounds perfect.
what plug are u speaking of ? do u mean the pintle shaft coming out of the IAC/
@@randy1ization the 4 prong plug that goes into the IAC is the same plug the guy disconnects in the video. rotate the plug and see what happens.
@@yourmortgageguyneilrobinso9166 NO, NADA, NICT, NINE, !!!!! there is no adjustment by turning the Iac Valve in and out, IT SEALS BY TIGHTENING THE IAC AGAINST THE TBI WITH A GASKET... and your not supposed to dick with the factory preset idle screw.. AT ALL FOR ANY REASON...EVER !!!!!!!!!!!!! the truck is not right, his idle was hunting from 600 to 1000 rpms.,., at warm engine it should stabilize.. The computer controls the idle thru the Iac, throttle position sensor and coolant temp sensor as well as the 02 sensor... he probably has a vacuum leak at the TBI base gasket, or the IAC is so tweaked it cannot retract properly anymore, you cannot clean them with solvent, you can only lightly clean the pintle with a soft brass wire brush..either that or the TPS is not installed correctly, or its bad. LOTS of chinese junk parts out there...
if theres carbon in the tbi where the pintle is supposed to seat and too much air leaks past, it will raise the idle.. these TBIs run kind of dirty. you have to take them off, clean and re gasket them abt every 5 years. not hard at all if u pay attention... there were 2 slightly different styles made, and they use a different gasket, so u must use the right gasket for the tbi u have or u will have problems... also on the TBI is the fuel pressure regulator.. the diaphram can tear or the spring can rust, weaken and or break and cause problems.. Dont do what this guy is doing.,. he will have it so out of whack he may never get it right. His Idle is hunting because the components are not in agreement.. the computer is trying to get everything in sync, but once he dicked with the idle screw, it cannot do it.. he needs to try and put the idle screw back to its factory position, and then figure out what the real problem is.. I would pull the TBI and rebuild it, and install a new OEM iac VALVE and see how it does.. he could also have a vacuum line unplugged from the map sensor, or elsewhere.
By rotating the plug do you mean unplugging it and rotating it 1/4 at at time? Or actually turning the whole plug while still plugged in to the assembly 1/4 at a time?
Where did you hook the probes from the meter to
I was wondering how much you turned that screw? I'm guessing less than 1/8 of a turn?
...counterclockwise?
I'm also curious how the throttle position sensor reacts to something like this if you know.
I appreciate the video.
TBI Throttle BODY Injection.
when did you take the clip out and when did you replug the iac
When did you take the paperclip jumper out of the data port? Is it still there?? I can understand the obvious answer, but it may make a difference if someone is unfamiliar with how and why you jump it to start with.
Thanks
Is the alligator clip on the spark plug wire to get the idle?
My 90 model K1500 doesn't have a tach and I don't know what you are measuring, so I just faked it.
I followed instructions, removed the plug to the torx adjustment and turned it CCW about 1/8 turn.
Disconnect Battery for 5 minutes then reconnected everything and started it back up.
Sounds and works a lot better. Still don't know my idle RPM but it's not too high. And it used to be.
so what if the screw is covered with a metal seamless cap appearing as sealed into the carb base and the screw is protruding on the throttle side just can't adjust since the head of screw is untouchable?
where was the multi meter connected? what was the selector set on? ( mA, or ohm or...). please reply 🙏🙏
I read that after unplugging the IAC, you're supposed to remove the paper clip from the ALDL prior to starting the engine and adjusting the screw.
When do u connect the iac
Is there a way to reset iac valve without using one port because mine has no connection
I have the 5.7 350 in my 98 Chevy Express G15 and it idles way too low... This is very helpful in understanding where everything is to adjust it. The only issue I have now is "Can I fit my giant mitts in the engine bay to adjust this?" 🤣
Is this the same procedure for the v6 also
Can I use the basics for a 91 s10 2.2, 220 model tbi.?
Wheredo you pin the volt meter to get that reading
I’m experiencing the opposite. Terrible hum when going down freeway. Thanks.
Puente en AB llave en contacto ,espere 60 segundos desconecte la valvula IAC encienda el motor y ajuste las RPM segun modelo del motor , apague el motor, vuelva a conectar la IAC desconecte el puente de las terminales AB encienda el motor, dejelo 10 minutos funcionando...apague el motor y desconecte el neg. -- de la bateria 5 min. Encienda de nuevo el motor y maneje por 10 minutos.....y liiiiiiistooooo. Jejeje saludos a todos.
Eres mecanico
No, pero tengo un CANCER IGUAL AL DEL VIDEO
Jejeje
“ the last thing you want to do is adjust the screw.. I adjusted the screw.” Ok so which on is it? Lol
1995 was the last year for TBI on the 5.7L. I'm not sure about the other engines GM used. The Vortec engines were MPI.
262, 454, 305 of this era used tbi. Early Vortec 4300, 5000, 5700, 7400 used cpfi with a spider valve, mpfi came later on the 4300, 4800, 5000, 5300 5700, 7400, 8100.
@@shadowopsairman1583 The 5.7 didn't get rid of TBI, at least on trucks, until 1996; with the introduction of the Vortec engines.
The 5.7/350 used TBI until the introduction of the Vortec. I know because my brother had a 1994 1/2 ton Chevy Suburban with a 5.7 and it was TBI.
I have been driving a 1995 K1500 GMC w/ 5.7L since 1998 and it's TBI as well.
Excellent video, mine idles at 12,000. Can you do this without a meter?
Sounds like the idle is the least of the problems for that engine
why?
What is the meter hooked to ?
I'd replace the map if not done already along with the tps, iacv. AC DELCO/DELPHI/STANDARD
good show brother
Great video. Do you start the vehicle with the old ports still jumped when making the adjustment or do you remove it?
That’s a good question that should be answered. I would think not but that is my opinion. The poster needs to address this question.
can this problem can be related to loose of power 5-8 sec after acelerartion on the reoad when chek engine is light no problem , and wen chek engine light off run fine , the motor is hi on rpm on idle
I could be wrong but I don't see it in the video, I think its necessary worm the engine up to operating temperature before you start this.
that nice but the multimeter is connected ware?
Would this also apply to a 454?
Great video Russel. Question, The location of the torx screw has a metal plug, How do you remove it?
Same
I think the tbi housing wears where the pintle shaft seats is why the IAC cant bring the idle down far enough on its own anymore.
Your comment is a year old but is relevant. I replace my IAC about a year ago. My intern has had some carbon buildup and during some cleaning of the throttle body I remove the IAC and noticed it was worn on one side pentil tip. Who is shiney metal, but only on one-quarter to one-third of the tip.
Does this apply to 89 chevy s10 pick up 4 cylinder??
My 89 Cheyenne C2500, 4 speed Muncie. Will idle high when it gets hot. I know the egr valve solenoid is not hooked up. Is my issue the a valve. Or is it due to the egr not being hooked up?
Have you checked that gasket under the tbi? Its notorius for breaking
How could I do this with no obd port, put a 305 in s10.
Arachnid mess with this title screw becuz of a cam that was put in the screw was sealed factory I was told never to mess with it now trying to set my timing seems like it can never get to proper timing becuz of the screw tampering wat would u sujust that needs to be done what the video shows? Or somthing else? Would appreciate it if u can find me a way out of this situation I have a 1989 scottsdale 350 looks identical to the moter in ur video that u for ur time
Could you please indicate where you are taking your voltage readings from ? Thank you
I believe it’s the rpm rating from the iac, i’m not too sure but i believe that’s what he did
The only way to keep it running is to keep your foot on the throttle so it wont die. It does better after it has warmed up a bit
O
If all else fails and you still have high idle. You will need 2 IAC valves.
step 1. remove the IAC valve, next adjust the pintle either CW or CCW and reinstall back (DO NOT connect connector to IAC) start engine and check RPM, you have to keep removing and adjusting until you get the RPM you want example 700rpm. (DO NOT reconnect connector).
step 2. Once you got the proper RPM, get a spare IAC and connect the connector to it (make sure and remove the pintle on it otherwise it will fall off when activated) and next tie the IAC valve down somewhere so it doesn't go anywhere. The reason you need this second IAC valve is so you won't get a check engine light.
This will fix the high idle (mine was over 1500 rpm and I got it down to 700rpm). The only downside is when you start the engine you need to give it gas so it doesnt die out, but as soon it runs a few seconds you can drive without the engine dying out. After fixing the high idle I actually was getting somewhat better mileage, from 12 mpg to 14 mpg.
So, could you just disconnect the plug after jumping the test port under the dash? Seems you waited for a step down, but then went ahead and disconnected the plug on TBI. What was the purpose of disconnecting the battery, it too seemed to be an afterthought in your commentary. Please clarify. Thanks
What stage do you plug it back in
I have a 2000 Chevrolet pickup, it idling slow, sometimes it cuts off, are loops when stopping at a traffic light.
Sorry sir but seems like you left some info out. When you set the idle with the screw was the IAC hooked up or not? You said in passing about unhooking your battery,why? Is it necessary? Where do you hook the multimeter?
OP please answer
So you leave the AIC valve disconnected while adjusting the idle screw????
Do you know what the brake light blinking is? Ever had that issue? Thanks!
That turned out to be the ABS wanting a reset. I unplugged the ABS module and then plugged it back in a fixed it.
What setting on multimeter and what wires do you connect your leads to so you can test them ?
That was a mystery to me too
Wondering the same
Same here, I’m thinking since he’s not answering one goes to battery and the other to wire to cylinder 1
@@gregcardenas9132 that would make the most sense
That meter he has ,has a clamp that indicates direction towards sparkplug and simply connects to meter . But I do believe you turn key off after unplugging iac then remove obd1 jumper wire to A&B ,start and make adjustments. Turn off engine, disconnect battery negative 5 min, start vehicle 5 seconds, turn off then restart.
at what point do you reconnect the airflow sensor.
I have a 1988 k1500 with a 305 in it. I did this and my truck is still surging. I rebuilt the throttle body and changed the injectors. All new gaskets in the throttle body. It idles where it should just surges like it’s trying to die then jumps back up to 730-750 then back down to 400-450 in park. After it warms up a bit idles is about 900 then when I go into gear it surges again.
My 1992 GMC Sierra with 5.7 350 TBI idles with IAC disconnected and once I connect it, it stalls. Tried resetting and I guess it’s not budging.
Where did you connect the meter to show the rpm’s?
For the iac connector if that plug in piece is broke (like the plastic around the prongs) would that cause a bad idle
yes, but it may not be the only problem... the tip of the iac pintle should not be more than 1 and 1/8" from the tip of it to the body of the iac where the gasket sits on it (or the part of the body of the iac that touches the throttle when it is installed) if not you have to adjust it manually by pressing it down, or get a new one.. the one the guy showed in this video is waaaay to far stretched out... go to the store and look at a new one and you'll see how it "should look" and that is just the deal for the iac, your idle issue could be a vacuum leak, spark plugs, wire, distributor, ignition control module, etc...
@@HOTRODRICO new one from store is not set they must be set!
When the iac goes bad< what will happen to the truck?
You think this would work on a vortec?
I have replaced several things on my son's truck ( 1995 Chevy Silverado with a tbi )
The IAC, throttle position sensor , new coil , ignition switch module , and rotory Buttons .I even changed the spark plugs but it still isn't running at idle speed on its own ..
What should I do next ???
Replace EGR valve.
Does this apply to a 305 also
T.B.I throttle body injection
friend, can you help me please, I have a Chevrolet suburban 1500 5.7 vortec 1996, I made the TBI carburetor and distributor, I had the camshaft altered a bit in stage 2 and I put an aluminum radiator with electric fans (the problem is that it It heats up after 15 or 20 minutes and the time according to the mark on the pulley is not left, I move the distributor and not Measure the time) What is the problem? can you help me
have the same motor in my 94 c1500 2wd idle is good but tach gauge drops down to almost nothing after warmed up and check gauge light comes on, give it a little gas tach goes back up light goes off. could this be the icv
Ground wire under dash Proubly check all grounds
@@jaydzesabala4369 what ground?
I did everything like you said. Idle came down and ran perfectly. But when I shut off engine and started it back up high idle came back. Did this twice with same result. Would my IAC be bad?
the same here.
@@mattmarshall2232 idle air control must be reset first as he did use jumper with IAC plugged in 30 secs or so this sends it home, turn off key remove jumper and then unplug IAC start engine, it will high idle, now you set idle speed. shut off engine plug in IAC should idle fine
Same with 7.4l 454 tbi ?
Some exact motor that I have and I’m having the bogging issue that you explained with IAC and I’ve changed that and I still have bogging and idle issues it runs like 200-350 sometimes will drop to 100 and bogg out any tips? Great video really helping me pin point the issue
May be an issue with your throttle position sensor (TPS)? I'm investigating that now with mine because I'm bogging when it down shifts sometimes.
@@Kin2InuYasha I’ll check it out! Thanks for the reply, unfortunately I just got rear ended about a week ago completely messed up the whole back end mf but she is still turning on lol
@@Kin2InuYasha was that the problem?
@@1DonJulito turns out it was not, at least for me. I replaced the TPS but did not fix it. The truck is still very drivable but I have to save up a little before I do further diagnosing.
@@Kin2InuYasha did you figure it out?
Great video. Very informative. I was wondering if you may any insight to a slightly different idle issue. After driving awhile with the AC on my idle gets so low the truck is on the verge of shutting off. Thinking maybe a vacuum line or something but I haven’t found it yet.
EGR valve?.... Easy replacement.
The reset worked great for about 2 minutes then idle climbed back up. whats next?
When you cranked the engine, is the jumper still in?
No. Remove the connector then remove ground before starting
Do I plug connector back in while running
How about adjusting the fuel mixture? Lean/rich...? Have 1991 suburban newly rebuilt engine and it continually backfires through the "TBI / CARB"... was told it's running lean and to adjust "the screw" but I'm not familiar, can't seem to locate.
Thanks for the time and the video.
Tbi doesn't have fuel screw. All computer controlled
Backfiring through the TBI? Check your timing. Kinda sounds like it's 180° out.
@@brockpedigo3807 I was wondering about that... Tnx
@@jdnixon3937 spot on, plus the plug wires were shot... Bastards...🎯
that is done by the computer
Where did you hook the ohmmeter up at?
into the tach wire at the ignition coil wires, there should be one wire not used out of the few wires that go to your ignition coil