Question about 1997 GMC Jimmy
Changed spider, plugs, iac valve, to no avale. help please
Verify throttle position sensor voltage off idle. oscilloscope is best. on regulur voltmeter use min max
Posted on Aug 28, 2017
Sounds like the fuel pressure regulator. Could also be that the timing jumped. But I'm leaning towards the pressure regulator. Hope that I could help. Best wishes.
Posted on Jan 17, 2009
I had the same problem with my 99 Jimmy. try to disconnect your battery for about 5 minutes and see what happen. it fixed mine by doing it.
Posted on Feb 07, 2009
Idle is controlled through the on board computer and is not adjustable, however after u cleaned the system you need to disconnect the battery for 5 minutes and then let the system relearn the idle speed, this takes about 30 miles of driving a combination of city and highway.
Posted on May 07, 2009
fast idle is many times caused by a engine intake vacuum leak, use a can of carb spray and spray the top of the engine for leaks, if u hit one u will hear the eng change idle speed, also look for split or leaking vacuum hoses.
Posted on May 20, 2009
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