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I have a carbureted 86 22r pickup. It runs perfect when cold. As soon as the choke pulls off the idle is rough. I have already ruled out the fuel shut off solenoid. It is clean and operates perfectly. Could it be the vacuum switch mounted on the fender well?

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It could be that you have to adjust the idle mixture screw a little . It may be set too lean or too rich which gives what you describe When the engine is at operating temperature turn the screw in or out a bit until the motor runs better. Adjust then until it starts to run rough then screw it the other way until it starts to run rough again. Correct mixture will be in the middle of those points.

Posted on Jul 22, 2013

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Posted on Jan 02, 2017

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SOURCE: 1992 gmc chevy 350 wont idle when warm

This could be a number of things but i think that your problem sounds like a vacuum leak or an EGR problem. Try listening for leaks and try un-plugging the EGR solenoid valve one time.

Posted on Apr 17, 2009

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SOURCE: Rough Idle on start up: faulty O2 sensor?

try coolant temperature sensor

Posted on Aug 19, 2009

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SOURCE: 98 Chevy Tahoe 5.7 liter engine cuts out and

Have you checked for vaccume leaks?
You've got lots of parts in there, Has the problem been the reason you have replaced all of those, or did it come up while doing some of the repairs?

Posted on Dec 18, 2009

  • 1374 Answers

SOURCE: Cold start-extremely rough idle-Shakes,smell fuel

Black smoke means buring rich. Have the vehicle's ECU scanned for codes and do the repair the codes describe. I'm gonna take a stab in the dark and say Mass Air Flow Sensor.(MAF)

Posted on May 07, 2010

Vicarious81
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SOURCE: 1992 Chevy Silverado idles rough why?

Check your MAP and TP sensors. Your throttle body may be having trouble determining position and is compensating by adjusting RPMs.

Posted on Nov 30, 2010

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1 Answer

Why does in run bad when cold as soon as it warms up she purs


Here is a maybe, based on my having had problems just like this.
There is a solenoid/switch that screws into the engine block that senses the temperature of the engine/coolant and adjusts the timing through the computer to enrich the fuel mixture ( an electronic "choke").
If and when this sensor goes bad, you will get rough running when cold, as the sensor is not telling the computer the proper engine temperature.
I have had to replace 3 of these on the cars I service in the last 6 years.
God bless your efforts.

Feb 11, 2016 | 1992 Toyota Pickup

1 Answer

It was very cold, the car sat in the garage for 3 days with very lower fuel, now it idles rough and sounds rough, did I ruin something by not having enough fuel when cold?


No,low fuel isn't your problem. If there's enough fuel for the fuel pump to pick up your car should run okay. You haven't ruined anything. It's not your fault.

It is possible that a low fuel level - very low indeed - has allowed debris/dirt into the system and is causing a blockage. However, I think this is quite unlikely to be the problem you have.

You say the car idles rough - does it drive at speed okay? If it drives okay at speed you can rule out most fuel problems .. most.

Backtrack a bit .. has your car ever ran/idled roughly before? Cold weather can exacerbate a problem.

It could be the cold weather- fuel and injections system have cold start devices or sensors of one sort or another. It may be a faulty sensor. Get somebody to do a diagnostic check for you

Jan 25, 2016 | 2007 Buick Lucerne CXS Sedan

1 Answer

Why am I having problems starting my pick up truck in the mornings ? ounce it starts it will start o k after


Fuel injected or carby,if carby check choke if fuel injected check the cold start injector if it has one.

Jan 23, 2016 | 1992 Toyota Pickup

1 Answer

My 91 Dakota starts hard and runs rough for a while and the check engine light stays on (no one around here has an analyzer for this year). After running a few miles you can shut it off and start it back...


Probably you have a lean fuel mixture for cold start up and running, but performs normal when the engine has reached operating temperature. So check all items responsible for fuel mixture such as fuel pressure and flow, air leaks ( use a smoke machine for this) choke system ( if carburetted) , engine coolant temp sensor.

Dec 24, 2014 | Cars & Trucks

1 Answer

How to adjust idle?


hot engine ?, cold or both,, EFI runs in 3 modes, cold ,warm and hot.

name it.

which engine option (displacement)??????



there is no idle adjust, that is the PCMs, job 100%, all the time.

Carbs are gone.

here is rule one for all EFI.

idle is the last thing to work correctly.

anything the causes a gross imbalance of engine power to engine load, under idle will cause , idle controls to fail.



low idling causes. (over 50 but, here ar basics)

1: AFR (air fuel mixture too lean) usually surges. (clogged or leaking injectors. or fuel pressure way to high)

2: air leaks, cause racing, so not that. (speed density car ,if is)

3: egr stuck open. low idle and misfire.

4: ISC stuck closed (IAC electric)

5: cam belt slipped, timing retarded, compression at 1/2 spec, and well, valve will bend soon....

6: CEL glowing running? can be in limphome, limp cancels Idle controls (in may cases) RTM read the FSM on DTCs.



if fails hot?, is hot = 180F temp or more? "thermometer time"

if not, the PCM goes , quite nuts.

Dec 23, 2013 | 2010 Honda Civic LX

1 Answer

My 1997 mitsubishi galant idles at 1000rpm. soon as on gear(like drive/reverse) rpm drops to 500 rpm and runs rough. if I run the A/C the engine runs rough and seems like it has no power to move on drive...


Have you run an error check on vehicle. You can have this done for free at most auto parts stores. Almost sounds like the idle sensor is having issues, but can not be sure at this point. Make sure the choke isn't sticking or hanging up if carbureted.

Sep 02, 2013 | 1997 Mitsubishi Galant

1 Answer

Vehicle: 1986 toyota "1 ton" pickup truck w/EFI L4 22-R engine. 250k miles After doing an ignition tune-up (plugs, wires, rotor, dist. cap, etc...), my rough idle issue has not subsided. Q: what should I...


Hi,
Please 1-check the PVC Valve. Block off the PCV valve and see if the miss goes away. If it does; replace it.
2-The other thing is to check the plugs to be SURE 100% SURE - they are factory rated for that engine. 3-check the fuel filter.
4-Remove the negative battery cable and give the on board computer 20 minutes - then re-connect and run the motor 20 minutes for the engine to adjust to the new settings.
5-Lastly if nothing else works -I will simply suggest a compression test - sounds like a valve may not have seated perfectly or is burnt.

Mar 17, 2010 | 1988 Toyota Pickup

3 Answers

2001 mazda tribute v6 runs rough cold ildes at about 200 rpm till it warms up then its ok what could it be


I replaced the upper & lower manifold runners seals, now it runs perfect, The reason it runs ok when warm is because the manifolds expand and seal the gaps on the surfaces that the worn old seals are not closing. Also change the spark plugs.

Jan 15, 2010 | 2001 Mazda Tribute

2 Answers

76 volvo 240 car idles and low speed is rough,


It could be the filter. Has the fuel been changed after storage? I would also thing the Carburetor or the fuel injectors might need to be cleaned.

Jun 30, 2008 | 1982 Volvo 240 Series

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