Question about 1996 Chevrolet C/K 2500

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Rough idle rich mixture - 1996 Chevrolet C/K 2500

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Check th condition of the air flow sensor, the ignition system also( spark plug,coils, wires,control module)

Posted on Sep 27, 2009


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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....

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.

Jul 21, 2013 | Cars & Trucks

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88 olds cutlass ciera international getting error code 45 cant find it in the book

Code 45 is for a rich O2 sensor. If you have already changed the sensor, the fuel mixture may actually be rich.
Possible causes include a leaking fuel injector, faulty fuel pressure regulator, or other problems.

Apr 14, 2013 | 1992 Oldsmobile Cutlass Ciera

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O4 sebring, PO175, PO174 codes?

Sounds like a problem with one of the O2 sensors.
Code 174 is bank two being too lean, and 175 is bank two being too rich. The computer tries to keep the fuel mixture switching back and forth between rich and lean. If the sensor is "lazy" the computer will make the mixture too rich or lean trying to get the sensor to react.
A mechanic can watch the sensor performance with a scanner to see what they are doing. You have two sensors on each bank.

Apr 06, 2013 | Cars & Trucks

1 Answer

Idles rough then takes off good

The emittion of black smoke on start-up is an indication that the fuel mixture is rich, (there's too much fuel going into the engine for the amout of air present in the engine), this could be because the fuel in one of the cylinders is not being ignited (burnt) by the spark plug,or one of the sensors is giving a false reading.

Oct 11, 2012 | 1984 Ford F 150

1 Answer

I have a F-150 99 with a code of P1131... Is it that sensor off the exhaust manifold the problem?? I also heard you have to have a special tool for this?? It runs great maybe idles a little rough. Does...

The P1131 means that your upstream oxygen sensor (the one closest to the engine) is not switching rich to lean and back as frequently as it should. This could be due to a vacuum leak, a failing oxygen sensor, or a rich fuel mixture.
Rich mixture - Too much fuel, not enough air.
Lean mixture - Too much air not enough fuel.

Jun 29, 2017 | 1999 Ford F150 Regular Cab

1 Answer

My 2000 ford expedition idles rough when the outside temp is 65 degrees or colder in the summer there is no problem i have already replaced the idle control valve did not help

so, when the engine is burning a rich mixture, it runs rough. Please take it to an Autozone and ask that they read the ODB messages.

It could be that your idle mixture is too lean. So a fuel system cleaner may be the fix... or a carb cleaner...

Something to get the system to give the engine more fuel on a cool morning.... that will make it better!!-Jim

Oct 22, 2009 | 2000 Ford Expedition

1 Answer

Idle is rough and rich after warming up 1986 toyota 4wdwagon 3 ac

sounds like you are not geting the right amount of air to fuel system.Have you checked the air filter is clean.Change the air flow senser if it is clean.Good luck!!

Jul 07, 2009 | 1987 Toyota Tercel Liftback

1 Answer

Engine backfires when accelerating, idles rough but runs fine over 50+ miles per hour.

Idle is rough because not a right Air/ Gas mixture.
The ideal air /gas ratio is 14.6:1. If less than that it has rich mixture. If it more then that it has a lean mixture.
Back fire happens when accelerated because of of rich mixture pumped out at exhaust cycle is burning.
At speed above 40 miles/hour, temperature and fast compression cycle make the problem is less obvious.
Cheap first shot is to replace the air filter to correct this ratio. If it doesn't help, need Fuel distributor service. ( However people like to make easy money from you first, they will convince you for a turn up) Good Luck. I'll check back to see how the progress going.

Jul 05, 2009 | 2001 Dodge Neon

1 Answer

1993 nissian p/u run rich and it running real rough

If it is a carb engine have the air fuel mixture corrected by adjusting the screws on the carb. Try also adjusting the idling.

For EFI engines see if you can check the Idle Control Solenoid Valve, have it cleaned. You can also check the oxygen sensor if it is working or not

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87 Supra idles rough and dies out

check timing and set idle to 650rpm

Dec 15, 2008 | 1987 Toyota Supra

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