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Old 04-24-2009, 11:02 PM   #1
Steve B
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Member#: 71165
Join Date: Sep 2004
Default Intermittent Huge Hesitation

Car is a 1987 GL Wagon, e82 SPFI 5-speed DR 4wd 329,000 miles. Symptom is sudden drop in idle speed from the normal 750 rpm to 200 rpm or less- sometimes bounces off the zero on the tach but never actually dies. When this happens, accelerating from a stop causes a major hesitation, that can be cleared by stepping on it pretty much to the floor- then it goes. When it starts idling low, if I shut it off then re-start, the problem goes away for the time being like 5 minutes or so.

Otherwise the car starts like it always has, runs fine on the freeway, the idle kicks up a little when turning on the AC, and really runs fine considering the miles. I have changed the hot wire air flow sensor with a wrecking yatrd replacement with no change. I removed the IAC valve and cleaned it well- no change. I then swapped out the IAC valve solenoid- no change. Car has been recently tuned with plugs cap rotor fuel filter.

Ideas?
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Old 04-25-2009, 09:30 AM   #2
euro_tech
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Member#: 206785
Join Date: Mar 2009
Chapter/Region: TXIC
Location: San Antonio
Vehicle:
1999 legacy outback
silver

Default

your car has the opti-window in the distributor IIRC. If you are seeing the tach jump around in combination with the hesitation/misfire, I would suspect the distributor of being bad. I've seen it many many times in the Nissans and Toyotas with the same crank position sensor configuration. One thing you can do is take the cap and rotor off and clean the window with some brake cleaner in case there is oil on it. Sometimes this fixes it. Other times it makes it worse. Which is actually not so bad because it confirms the diagnosis.
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Old 04-25-2009, 09:35 AM   #3
Un0RiGiNaL
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Member#: 189748
Join Date: Sep 2008
Chapter/Region: MAIC
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329k miles?

I think its time for you to let go
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Old 04-25-2009, 10:22 AM   #4
yarrgh
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Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Aurora, CO
Vehicle:
2001 2.5RS
Black Diamond Pearl

Default

there is a specific forum for older cars, you may find better help there. To me, it sounds like a fueling problem, either pump or pressure regulator.
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