I have a 1988 camaro iroc-z and when i first start it up it idles good then after it warms up it idles horrible... 500 rpm up to 1200 or so and back and forth the timing is good and so is the egr valve...
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Re: 88 camaro poor idle when engine is warm
Don't remember if they used an idle air control valve or mass air flow sensor on ones that old but either can do that. If not check your vacuum hoses for splits, cracks and good connections. You did not list engine size, but controls are pretty much the same. I'm pretty sure you can do a computer scan on those by jumping the under-dash connector...get a manual for codes and instructions on that. good luck!
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Change the temperature control sensor to the front if the engine near radiator 1 start the truck let it run till you think it is at normal operating temperature 2 unplug the temp sensor if the idle changes then the sensor is bad
That ticking is usually a loose rocker arm. Use a mechanic stethoscope and you will find which one needs adjusting or replacing. A push rod may be partially clogged and caused excessive wear. Older vehicles which have been in storage often have oil leaks and related. This happens if the vehicle has not been started on a regular basis. Nonuse causes seals and gasgets to dry and shrink so be aware and look for leaks.
The high idle is caused by the choke and the high idle on the carb. It is working normal and you do won't to warm up this motor before going. When it is warm and you hit the gas it activates the choke pull off to bring the idle to normal. Your mechanic is used to fuel injection that will control the fuel/air mix according to temp. I still let my injected cars warm up so the oil can thin a little. If you jump on the highway with cold thick oil it can all wind up in the to of the motor.