HELP! - Scan Results for L36 w/ cam, high compression - Page 5 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-04-2005, 02:12 PM   #41
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Something I forgot to post.

Your misfire may be due to all the octane boost you put in your gas tank as that craps up your plugs. Remember that orange stuff on the base that I told you about..... That'* cuz of the additive. Also I'm glad to hear that no problems are to be suspected with the internals. I also believe that(according to Bill), you have a bit more low end grunt than you are seeing right now. You just need more fuel to bring it out.
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Old 12-04-2005, 02:14 PM   #42
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Good point, but let'* remember the 3 cans of octane boost he dumped in only raised his octane 0.3, not 3 full points.

So he was only running 93.3, at the most.
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Old 12-04-2005, 02:36 PM   #43
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I just got off the phone with a buddy of mine whose dad is an ASE master mechanic. He was talking to his dad about my car, and mentioned that it was running lean even though the PCM was attempting maximum correction. His dad suggested to look for a vacuum leak, because he says that a seemingly uncorrectable lean condition could be the result of losing vacuum.

Doug can attest to the fact that I have some pretty crappy rubber vacuum fittings right now, and it got me thinking that maybe my buddy'* dad could be right. Comments?
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Old 12-04-2005, 04:23 PM   #44
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That would tend to make it worse on the high end as opposed to the low end IMO.
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Old 12-04-2005, 04:37 PM   #45
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That'* good to know, and makes sense because my buddy probably didn't describe the RPM/load conditions under which the lean condition has been occurring. Thanks for the analysis. I'll see if I feel like getting the plugs out tonight. I know it doesn't take long, but it'* cold outside and the car currently resides under 4-5 inches of snow .
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Old 12-04-2005, 04:39 PM   #46
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I gotta think some more on the vacuum idea. It'* possible still, I suppose, since the ratio of 'dilution' would be less at the higher RPM'* when you factor in the sheer volume of what the throttle plate is letting by.

If you had a vacuum leak, that equates to un-metered or undected air getting into the manifold without the MAF having the luxury of 'seeing' it.

Anyone else have any thoughts on this idea?
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Old 12-04-2005, 04:50 PM   #47
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Interesting line of thought...

My scantool shows manifold vacuum through my MAP sensor reading, so perhaps I can go out for a quick scan later today. What do you think?
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Old 12-04-2005, 05:01 PM   #48
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I think a good scan of yours and a couple other known good L36'* may be in order.

Try cold idle, hot idle, 2000 rpm'* and 3000 rpm'*.

I can't help you there, as the only purpose of the MAP sensor on my 93 is for the boost reading (never reads manifold vac except at idle) and the 95 didn't get one, as it didn't come with a boost gauge.

Really need to compare to some L36'* here.
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Old 12-04-2005, 05:37 PM   #49
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I almost forgot, I have this thread as a reference:

http://www.3800pro.com/forum/showthread.php?t=3671


Maybe Mike will peek back in here, as well as some other L36 owners. I need to get an actual vacuum gauge instead of relying solely on my MAP. Not sure if I'll scan with my AutoXray or if I'll wait to post results from a better scanner. Either way, I have to admit that I'm quite reluctant to venture out into the cold right now . We're at 12 degrees with a wind chill of -2 right now, but it'* supposed to get back into the high 30'* again next weekend so you can probably expect results by next Friday, Saturday, or Sunday. It'* just no fun to work out in the cold with no garage!
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Old 12-04-2005, 06:56 PM   #50
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Sissy....
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