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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-20-2004, 08:08 PM   #11
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Now I put my stock injectors (cleaned) back in. I leaned it out quite a bit, but then it wouldn't idle less than 1500. So I leaned out the bottom end just a tick more. It did the trick. 800 rpm and MUCH BETTER gas mileage.
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Old 09-20-2004, 09:06 PM   #12
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Randy also had the high idle, not too long ago. Seach for his thread, he'* got the fix.


-justin
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Old 09-20-2004, 10:09 PM   #13
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Quote:
Originally Posted by jwikoff99
Now I put my stock injectors (cleaned) back in. I leaned it out quite a bit, but then it wouldn't idle less than 1500. So I leaned out the bottom end just a tick more. It did the trick. 800 rpm and MUCH BETTER gas mileage.
Mmm...important question, did you lean it out or make it 'not so rich'? I have a similar thing with my car, not enough fuel = IAC tries to compensate by closing more. But if you actually did lean it out (below stock) you might just be putting a band-aid on it.

CFoote good thought to suspect the TPS although with my experiments with the TPS a 1500rpm+ idle resulting from mis-adjustment makes it very difficult to get into OD and is quick to downshift so there would be other problems associated with it. Wow, what a drag-on sentence huh?
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Old 09-20-2004, 10:13 PM   #14
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Can you elaborate on:

Quote:
Originally Posted by jwikoff99
So I leaned out the bottom end just a tick more. It did the trick. 800 rpm and MUCH BETTER gas mileage.
My idle problem wasn't fully cured with the changes I recently made. It'* strange, it'* fine one day and fluctuates another.
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Old 09-20-2004, 10:18 PM   #15
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Oxygen sensor in exhaust manifold?
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Old 09-21-2004, 05:57 PM   #16
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Quote:
Originally Posted by randman1
Can you elaborate on:

Quote:
Originally Posted by jwikoff99
So I leaned out the bottom end just a tick more. It did the trick. 800 rpm and MUCH BETTER gas mileage.
My idle problem wasn't fully cured with the changes I recently made. It'* strange, it'* fine one day and fluctuates another.
With my AFC, I took the reading down one point in the lowest two settings.
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Old 09-21-2004, 06:25 PM   #17
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Let me clarify a little more. I had 24 lb injectors I thought were bigger than stock after recieving some bad advice. Had them in for several months. Replaced FPR, fuel pump and strainer. Idle rose over then next few weeks, and was a little rough. Saw a cracked vac line, replaced it, smoothed out idle, but no RPM change. Waited two days, reset the PCM, waited some more, no change. Got back stock serviced 30 lb injectors. Adjusted the AFC down proportionally, put in injectors, reset PCM. A little more smooth, but even 1500 rpm. Waited a day, no change. Took the bottom two settings on AFC down a point each, 800 rpm. It'* a little rough, but I think the lack of a MAF screen may have something to do with that.
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Old 09-21-2004, 06:58 PM   #18
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Yeah, I have a lopy idle with the MAF screen removed. It was smooth at first, but after driving a little, and the idle dropping a little. It roughened out, but man do I love it! Sounds mean as hell! Some may interpret it wrong though.


-justin
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