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|All Messages in Thread||Author||Date|
|Engine spike||gerald hoffman||6-26-12|
|What would make a 1990 ford ranger spike between 1 and 2 rpms when just sitting and idling? Like when I start it it idles at 1 rpm or just a hair above then after it sits for a min it starts spiking between 1 and 11/2 and 2 rpms|
|Re: engine spike||BUBBA THE BUS TECH||6-27-12|
|Usually the computer will only do this if you have a miss or other run problem.|
The other things that can be dificult to track back are sticky egr valve, worn throttle shaft, poor or bad fuel injectors, throttle not returning completly to idle.
|Re: engine spike||Phil Feinstein||6-27-12|
|If this happens at idle under no load, it would point to a bad or sticking Idle Air Control (IAC) valve. Your model is EEC4, so this should set a code and be easy to retrieve.|
If you have access to a code scanner, I suggest running a "Key on, Engine running" test (KOER). If the problem is an IAC valve, this will show it immediately.
Hope that helps!