1991 Chevy C1500 Idle Air Control Valve Replacement
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- Опубликовано: 1 окт 2024
- This is a tutorial on how to swap out an IAC valve in your 1991 Chevy C1500 pickup. This motor is the 5.7 V8. I am not an expert, I’m a semi professional amateur learning as I go. I hope I can help!
Dear colleagues; disconnecting the battery before any repair on a sensor is advisable in order to reboot the computers of any car.
Thank you
What’s happens if you don’t disconnect the battery, because unfortunately I didn’t and the truck keeps shutting down??
@@romansandoval5399
You can still try and disconnect the battery.
Connect the 2 battery connectors together for a couple of minutes in order to reboot the car computer.
Reconnect the battery.
If this do not work it is possible that the sensor got defective due to installing it without disconnecting the battery.
You have to reboot the car computer otherwise the car will not detect the new sensor.
Normally this is done with the car scanner but if you don't have a scanner this is the only option.
Thank you so much this helped a problem with my truck but I still have anouther problem it idles fine when In park and I can even rev the enigne but when I put in in drive or reverse if I don’t step on the gas it stalls But if I get it to 10 mph I can drive just fine but as soon as I slow down to stop or turn it stalls do you know what it could be? I have the same truck as you it’s a 93
Did you find out what was causing it. I'm having the same problem.
@@theblack_6.033 all new distributor would help had a buddy with a problem truck turned on but once in gear would turn off sometimes and it was only if he didn’t have his foot on the gas it fixed his problem
Thanks for the video. My 90 Cadillac Brougham has the same motor and issue, hopefully it helps me. If not at least it won't break the bank.👍🏻
I unplug the iac valve on my 92 gmc sierra iac valves are useless all they do is break and create problems
My idle on my truck after taking it to a old mechanics shop was somewhere areound 600 i think where before it would idle around 1500 with a bad throttle gasket
My 02' Blazer ZR2 has always idled like this at cold start but kicks down after a minute or 2.
My 94 C1500 had random rpm surges when idling. Replaced fuel filter, a vaccum line, and ran Seafoam through the gas tank in case it was the injectors. Still happens. Was going to clean the MAF until I realized....theres no MAF🤦♂️. Anyone think that cleaning or replacing the IAC will fix it? Its not a huge issue, just annoying that half the time I stop at a red light, someone thinks I'm trying to race
Sounds like a base gasket vacuum leak. Replace the gasket. Common problem. Can also be a vacuum leak elsewhere, but that sounds like a base gasket issue.
Fyi. These are easy to clean and they are way better parts than the overpriced replacements
If the control valve is blocked would this lead to a weak idle? My truck has been running way too low when stoped but seems to be okay when driving? Any ideas?
Replacing all of the easy to access sensors fixed my low idle in my 5.0 TBI. MAP sensor seemed to be the one that did it and it's relatively cheap and super easy. Control valve and MAP sensor.
My 92 s10 gets 10 mpg and runs super rich, lots of power and runs good besides the above mentioned, I’ve changed everything except egr and o2 sensor which I did check and they’re working
Change EGR . Promise you’ll notice a difference.
what in the absolute hell is that ticking?
So I've replaced my map sensor, rebuilt the throttle body, replaced the IAC that you replaced in this cid, also did the injectors and fuel filter, new pcv. The vacuum lines are good and the motor has been rebuilt. I honestly don't know why it wants to still stall or have a decent idle until a stop light. It runs great but it doesn't. Didn't know if anyone had any thoughts
Sounds like the problem I'm having...its killing me
@@RogueKnight33 I was told to go to a carburator set up and delete alot of the electronic stuff
@@SekadaJones I figured mine out! It was the maf sensor!!
@@SekadaJones I did also do a fuel filter too but positive it was my maf(map) sensor
@@RogueKnight33 thank you, I've done both of those aswell. Still acting up
I put a new one in the 87 Chevy g20 but it didn’t run correctly, 5.7 liter didn’t seem like it wanted to run correctly. Put old one back in it was ok. Am I doing something wrong? How to reset?
If that was a lifter tap ad a qt of transmission fluid to the oil every change it will keep the lifter clean and right !
Where did you purchase the part from ??? Someone pls help, because I bought one at auto zone and it didn’t seem to work had same problem.
I think I got this one from Rock Auto.
unplug computer advance while running and plug it back in idle will drop to around 600rpm
When I bought my truck 5 years ago started changing sensors aic,tb,map, temperature control,knock I'm finding the AIC about 2 years needs cleaned or changed ilove my k1500 1995 350 tbi I hate the sensors but the engine is kick ass also Didi differential fluid front and rear does anyone have problems with the brake safety switch what a pain in the ars
I have a issue while driving, after cruising for awhile it’ll get stuck at 150k rpm and I have to put it in Neutral an rev it a couple times before it goes back down.
150k rpm sounds like your engine would explode.
This was straight to the point and very easy to understand thank you 💯
Low idle is a good thing
They say that when this is replace needs to be recalibrate or reset is that true? U didnt show that or u didnt do that?
Just unplug battery for 5 mins no need to do anything but install plug in and first start won’t work at all turn it off then back on and it should work that’s what happened to me
Would this fix a low idle problem?
What does that dryer vent thing do that attaches underneath the air intake?
it takes some ambient heat from the manifold and directs it into the throttle body to assist in warming up the engine
Thanks for posting
Why is my idle to low how can I fix that
Replace the IAC.
Put mine in today. Idle went through the roof. Did all correct resets and still was super high idle. Put old one back in. Normal idle Any ideas? I’m guess it’s a fault valve. The spring was low on the new and the old was up.
Mine has this same problem what do I do?
@@brayanbasalduamartinez9937check the pcv grommet, if it’s cracked or old you’ll need to replace it. Idle goes back to normal
Your connector isn 't plugged in correctly.
@@alanrives6731 turns out it was the valve cover gasket last owner just shoved one in Replaced gasket. Perfect idle 😎
@lht5dy31 why did the valve cover cause the issue? The gasket for the grommet
Did this solve your problem?
Yep!
Great video and nice looking truck. I have a 1995 C1500. What’s the air drier looking connection off the bottom of air cleaner assembly?
Cold start something I think
Got the thing on my 88
Heat riser. Funnels warm air off the exhaust manifold for cold weather starts. Not exhaust gas, just ambient heat.
that engine should idle at 750 rpm not 1200 you need new idle speed sensor.!
I was about to say the same exact thing! I drilled mine out and adjusted it ...helped but still alittle high. 750 is perfect! 1200 is still to high.
The tach is incorrect. It's idling perfectly.
It’s been 2 years, what happened?
Well, truck is still running great. I replaced the AC blend door actuator and am 95% done getting the new LMC dash in and installed. Just waiting on a few small things.
Gracias por su video
there is a wire harness disconnect for the a/c flapper door,, no need to remove any panels just reach under that area where noise is coming from and disconect it
Problem is I want to actually fix it so I can run with A/C. Unplugging it only stops the noise.
What’s the wrench size ?
1 - 1/4
Or and adjustable
What is the average fuel economy on your van?
Unplug actuator...problem solved....
Dont forget to reset it ab terminal with key
Can you elaborate more on the reset, please
My 94 always idled around 800 to 1000. Recently on start ups it been idling real ruff, like the plugs or wires or something electrical is wrong. Isn't throwing codes yet, so i'm thinking it's some little dollar part. Just don't know what part it is yet.
My 94 Chevy k 1500 idled rough for about 10 minutes when you would first crank it up. I changed the 02 sensor and it fixed it.
I had the same problem, was the knock sensor for me on my 90 firebird tpi
Common problem with idle on these trucks is your cap and rotor they tend to crack try replacing those
I replaced a vaccum line and the fuel filter and it smoothed it out but I still get RPM surges, working to fix that now
My truck dies on drive lmao idk wth is going on with it 💀
Battery or alternator maybe. Could be a bad ground on the battery.
First check for spark and fuel
Maybe fuel delivery /pressure . Fuel pump may be weak, more likely a clogged fuel filter. Start there, then fuel pressure regulator , clogged injectors.
Maybe a stuck open EGR valve, or even a coolant temp sensor .
Mine would die when I turn the steering wheel when I’m parked or do a turn to park/go into my driveway and I hear it idle down than normally and it shuts off mid turn and sometimes at a stop sign or light when I do a complete stop. Doesn’t shut off all the time, just sometimes. Still looking for a fix. When I leave the wheel straight without touching it, it idles where it’s supposed to be at.
My fuel sending unit was bad. I unscrewed the o2 sensor near the cat and it tricked the computer to send more fuel to the carb. Got me home and to the shop. Was pretty loud though