MAF Mod followup - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 10-17-2004, 08:17 AM   #11
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this is the mod where the MAF sensor is located inside the TB like a mustang or something, right?


-justin
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Old 10-17-2004, 11:48 AM   #12
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he removed some of the MAF housing from the TB.
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Old 10-17-2004, 11:52 AM   #13
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oh, well.. don't know what there is to remove, but I need pics loL


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Old 10-17-2004, 12:55 PM   #14
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Looking at yours and travis' logs it looks like you have a lot of KR and its pulling timming?

What could be causing this, false knock?
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Old 10-17-2004, 01:29 PM   #15
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Sorry, is this about the removal of the little brace inside the TB? It has the MAF in it right? Could you possibly link the old thread to this one?
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Old 10-17-2004, 03:13 PM   #16
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We started out in this thread: http://www.bonnevilleclub.com/forum/...ic.php?t=24243

PDad, From I can tell with limited experience and DrJay can tell from the numbers and what I'm saying, It'* probably a fuel delivery problem. The car idles perfectly, It can handle a quick rev, But when under load at WOT it bogs like no tommorrow. This isn't connected to the mod as it'* gradually been getting worse at doing it, I just didn't know it and didn't have a scantool to check it.

I'm a couple hours from putting the TB back on, Then I'll get a Fuel Pressure Guage and we'll see whats up. This thing is scary powerful sounding, Hopefully it'll be as fast as it sounds.
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Old 10-17-2004, 03:37 PM   #17
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Dame, I just got off the phone with Pdad. We were discussing your KR. I think your loose rockers were causing most of it, falseley. Try another run after you get them all re-torqued, and try to duplicate conditions.

Your loose rockers were in the rear bank, which is closer to the knock sensor than the front. Loose rockers are VERY big contributors to false knock.
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Old 10-17-2004, 04:52 PM   #18
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All rockers are retorqued.

I got fuel pressures of about 30 at idle, on WOT snap it jumps to about 40 then slowly goes down with the rpms to about 38 at redline.

I just got a run in the scantool, I'm Going to upload it as soon as I get it in the pc here in a minute. It'* still doing the same thing...
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Old 10-17-2004, 05:25 PM   #19
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Yup, I'd say you prrooobably found your problem..

Next while letting the engine idle pull the vacuum line off the FRP and note what the difference in pressure is.

I've been working with him on this issue for a little while now. I was thinking possibly false knock but after looking at his fuel trim I started to rule that out. Between the one he posted and others of his he'* shown me his trim level is really jittery, and usually high. Since sometimes pumps will work-kinda work-work-kinda work it would match up to his bouncy trim levels. That coupled with the fact that the pcm retarding the timing was not seeming to help (KR actually growing as he accelerated) kept me believing it was a fuel issue.

In anycase dame - get that '94 one in there!
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Old 10-17-2004, 05:37 PM   #20
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The fuel pump crapping out would cause the car to run lean and create kr so that makes sense. What is the lean condition doing to your plugs? You might want to recheck the gap?
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