I am working on a 92 Laser 2.0 twin cam and idle surges up and down when warmed up..is this a common problem?Tried to get codes,but not typical chrysler tun key three times and count blinks,could it be coolant temp sensor?and where is it located on engine...thanks in advance...Lee(firstname.lastname@example.org) ,
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Re: Idle surging.Plymoth Laser
It should be on the manifold close to where the thermostatic housing is located. it should be a one wire connection. Also helpful tip, go tp autoparts store and ask to see the sensor that it is calling for your car. That will also give you and idea what your looking for.
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www.jaguarforum.com/showthread.php?t=54266 Mar 3, 2013 - I recently bought a 1993 6.0 V12 XJS and when it is started from cold it runs ... to 1300 RPM so it wants to surge forward when braking which is strange. ...Classics · XJS 3.6,4.0,5.3 & 6.0; 6.0 V12 XJS High RPM When Warm ... You might want to adjust the aux (extra) air valve to bring the idle speed down.
When idles surges its due to false air, The MAF (mass air flow) calculates the amount of air and responds to the proper amount of fuel, When you get false air such as a broken PCV valve,or ruptured vacuum hose the idle increases and you get the surge that you are describing,Your basically out of fuel control .
1.Verify that the cooling system is full of coolant and there is no air in it. 2. Remove the air boot from the throttle body and cover the throttle body with something that will stop the airflow . the Fast Idle Valve is the problem.
block off vacuum hose to brake booster and see if idle returns to normal if it does you need new brake booster has hole in diaphram internally some times slight hissing noise is evident in cab when pressing brake pedal to section where engine surges or idles high. also check for fuel leaks from hoses if you can smell fuel in engine bay while running and engine warm some leaks only leak while running and hot
Something is riching or leaning this vehicle out at the wrong time. I'm gonna go with ERG valve being stuck in the open position. The only time this thing should work is at crusing speeds. Once the car has cooled down the fast idel cam takes over and prevent it from stalling. Once temp is within range idle cam stops and EGR is dumping into the mixture.
Use shop manual to do proper testing for the valve( probably a hand held vacuum pump is all you will need and gum out to free it up but you should properly replace it if it turns out to be the culprit.