Question about 1994 Chevrolet C1500

1 Answer

Fast idle after warm up .already changed IAC valve

1994 gm 4.3L fast idle after warm up .already changed IAC valve.

Posted by on

  • 1 more comment 
  • Anonymous Mar 19, 2014

    idle surge between 120 degrees and 160 degrees

  • Anonymous Mar 19, 2014

    idle surge between 120 degrees and 160 degrees on 1985 corvette

  • Anonymous Mar 19, 2014

    idle surge between 120 degrees and 160 degrees on 1985 corvette

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • Chevrolet Master
  • 80,339 Answers

Fast idle is many times caused by a engine intake vacuum leak, use a can of carb spray and spray the top of the engine for leaks, if u hit one u will hear the eng change idle speed, also look for split or leaking vacuum hoses.

Posted on May 20, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My 1994 samurai idles really high when I first crank it, but later slow down. is there anyting I can do to ?


From a cold start my sami idles really fast, but as I drive it and the engine warms up it will idle correctly. Is there a way to make it idle slower from a cold start?
what engine ? 1.3 L
carb or EFI? (94 was first year of efi, and many have been converted this old)
but the answer is the same , that is normal.
on car its a fast ilde cam on the carb.
in EFI its on the software and in the IAC thermal valve.

Mar 29, 2013 | 1994 Suzuki Samurai

1 Answer

What is the IAC valve?


Idle Air Control valve -used to control engines idle

Jan 09, 2013 | 1994 Nissan Quest

1 Answer

MY F250 IS ROUGHT AT COLD AND IT TAKES TO WARM UP. AND EVEN AFTER WARM UP IS ROUGHT BUT NOT AS MUCH. A MECHANIC CLEAN THE EGR AND IT IMPROVE BY 85 PERCENT BUT IS STILL ROUGHT


If you already check for vacuum leaks, change the plugs, fuel and air filters, the next step is to remove the plastic duct from the TB to expose and wipe clean the IAT sensor (screen covering TB entrance) applying Carb. Cleaner into a clean rag to wipe it clean. Do not apply Carb. Cleaner directly into TB or IAT Sensor. If problem persists, your IAC valve may be defective.

The Idle Air Control (IAC) valve adjusts the engine idle speed. The valve is located on the side of the throttle body. The valve is controlled by a duty cycle signal from the PCM and allows air to bypass the throttle plate in order to maintain the proper idle speed.

Do not attempt to clean the IAC valve. Carburetor tune-up cleaners or any type of solvent cleaners will damage the internal components of the valve.



Good Luck!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa!!

Feb 18, 2011 | 1999 Ford F250 Regular Cab

1 Answer

I have a 91 s10 chevy, and lately i have been having problems with the way it has been running on warm up. When i fire it up it spuders and dies right away. But will run fine after it is warm? i dont know...


Hi there sounds like idle air control valve failure. Or also known as fast idle valve. I would suggest locate and clean. If that doesn't help then replace it and you should be good to go

Nov 04, 2017 | 1991 Chevrolet S-10

2 Answers

1994 honda civic 1.5 16v stalling after pressing accelerator from idle


Another place to look is your IAC, or Idle air control valve. It is bolted to the back of the intake manifold, and can be removed and cleaned. It is usually the cause of most Honda Idle problems.

Apr 18, 2010 | 1994 Honda Civic

1 Answer

Jeep fast idle


check for broken pcv valve

Feb 05, 2010 | 1990 Jeep Cherokee Limited

2 Answers

My 1991 Celica GTS has a fast idle even when the engine is warm. I have already turned the idle adjust screw all the way down.


The idle on these is controlled electronically by an IAC solenoid (idle air control). Adjusting the screw will not do anything to adjust your idle down. Chances are you could have a vacuum leak, or a faulty IAC solenoid. I would start by checking for vacuum leaks.

Oct 17, 2009 | 1991 Toyota Celica

1 Answer

I have a 92 honda accord ex that the it idles go


If it does that when the engine is warmed up (full operating temp.) it may be you iac valve, or your fast idle valve. They get gummed up. It also could be your PVC valve, but probably not.:

accord8.jpg
IAC in red. Fast Idle in yellow. Your PVC valve is plugged into the valve cover (the black hose in between the red and yellow in the picture) it simply pulls out. It should rattle when shaken.
Hope this gives you a start on the problem.

Oct 09, 2009 | 1992 Honda Accord

1 Answer

87 Ford F150 idles too fast


either a vacuum leak or an idle air control valve problem most likely.the iac is on the side of the throttle body.cylinder shaped with a small harness.

Jun 11, 2009 | 1987 Ford Ranger

Not finding what you are looking for?
1994 Chevrolet C1500 Logo

Related Topics:

1,182 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

80339 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...