Question about 1991 Chevrolet Corvette

1 Answer

My engine Lopes between 500 and 900 rpm at idle or when in drive but at a stop. 1989 C4 Auto transmission.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 132 Answers

Did you put a cam on it or any kind of performance systems?

Posted on Nov 08, 2010

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,
a 6ya expert can help you resolve that 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.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Why does it idle at 2,500-3,000 rpm then drop to 1,000 rpm in drive or reverse?


Hi Paul:
Here are my random observations:
- 2500 to 3000 is really high for "idle"
- Putting it into drive or reverse engages the transmission and puts load on the engine through the torque converter. Since the RPM is high enough that the vehicle thinks it should be moving, the transmission will engage and rpm will drop since more power is needed.
What to do? How long since tuneup?
History? Did this just start immediately, or did it sneak up a bit at a time.
Make, model, engine, year, Kms or miles. Give us some info and someone who is a better transmission specialist will probably kave some more ideas.
Cheers.

Feb 28, 2016 | Cars & Trucks

1 Answer

MY Hyundai Veracruz engine (3.8L) idle too low (600 Rpm) in cold weather (less than 40F), when engine is warm and transmission on drive and vehicule stop. This cause a undesirable vibration. When outside...


It may be no engine thermostat which keeps the engine temperature at a constant 180F usually. Or you have some bad connections to a temperature sensor that sends temperature information to the Ecu (brain) and controls fuel. Corrosion causes
bad connections If you have an auto parts store scan your error codes that will be a better diagnostic. It is possible a problem with transmission fluid level or quality of fluid.

Mar 17, 2015 | 2007 Hyundai Veracruz

1 Answer

Engine "lopes" at idle or when coasting. Suspect vacuum leak. Possible?


That will do it. Cut back the hose just enough to get past the crack. Caps can be had at an auto parts store.

Aug 27, 2014 | 1989 Lincoln Mark VII

1 Answer

Audi 100 c4 with automatic transmission engine turns off when gear put on drive


stationary rpm is to low,its normal higher the handgearbox.
too keep motor running it chould be higher so engine stay running,
while put in drive.

Apr 13, 2013 | Audi 100 Cars & Trucks

1 Answer

Was loping in drive, would have to put in neutral, now stalling in neutral, at first i thoght it was the fuel injector, not sure


engine runs smooth if giving more than idle pressure. It is when the motor is engaged with transmission at start the engine lopes and wants to cut off. If I press the throttle hard it takes right off. If I come to a stop I can put transmission in neutral to keep it from cutting off. This creates a shifting that is not normal and I'm afraid it is a sign of failure coming.

Sep 28, 2009 | 1990 Mazda 626

1 Answer

93 Magna Auto vibration at idle


Check your engine and transmission mounts .

Jun 26, 2009 | Mitsubishi Sigma Cars & Trucks

2 Answers

Throttle/Idle/running problem - wants to run too fast, or stall out


RPM's up and down check EGR valve and sensor. EGR valve and sensor control idle. That's why your getting the surging on rpm's and this could be giving out the other codes. If mass flow was bad car will not start and the same for the map sensor. O2 sensor measures gas and air for right mixer. TPS controls 0-60 speed as in throttle respons.

Apr 28, 2009 | 1989 Pontiac Grand Prix

1 Answer

1989 Mercury Sable, 3.0L V-6, Auto Trans. Engine Idles at about 2000 RPM.


Check your vacuum hoses (They are 3/8" Rubber hosing on the right side of the engine, you will need to remove the air intake piping (Also remove the throttle body to make accessing them easier) This is the #1 cause of high idling in the 3.0 OHV and 3.0 DOHC sable engines.

Jan 17, 2009 | 1989 Mercury Sable

1 Answer

1989 Mercury Topaz Transmission problem !!!


overdrive should be activated by a solenoid ..internal and perhaps an external one also.. in 89 the computer was primitive and i dont think controlled shift points..also if engine health is bad or missing or vacuum to any cacuum modulator at trans is damaged or compromised.. these issues could occur...good luck

Dec 26, 2008 | 1989 Mercury Topaz

1 Answer

Engine wont idle


Here is the most common cause of surges and stalls, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Dec 02, 2008 | 1989 Ford F 250

Not finding what you are looking for?
1991 Chevrolet Corvette Logo

Related Topics:

153 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

75197 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7782 Answers

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

Answer questions

Manuals & User Guides

Loading...