TJ's Motors built/in (working on KR issues now, update 9-12) - Page 23 - 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 09-12-2007, 07:16 PM   #221
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Also if it is some kind of false knock and the sensors only show knock when the car is up to temp is there a way to check that. Bill (boost) had suggested wrapping my knock sensors in like the intense false knock eliminator kit stuff (dynamat). I mean it couldnt hurt.

The thing that truely confuses me is the car will see 15 degrees of KR when in park just free reving it. That just makes me want to believe deep down it is false KR.
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Old 09-12-2007, 08:16 PM   #222
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Or it'* just crazy lean.

I've already said what I think you should try. Get a chip burned. I think at this point there'* nothing more we can theorize without trying some new parts and seeing what happens. It seems like your fuel pump is probably alright... we can't be certain, but all things point to it being fine right now. I don't understand why you would keep suspecting it when you just swapped in a cam and you know you're pulling way more air than before. While my car is a slightly different case, my experience points to an insanely lean mixture after a cam swap with no tuning.

I'm not saying you absolutely have to do a chip right now... you just need to change something at this point or we're all going to sit around and guess about it without ever figuring it out. Shotgunning parts at a car is never good, but at some point you have to follow your best guess. That'* how you learn more.
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Old 09-12-2007, 08:42 PM   #223
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Well lets say... My next thing is a custom pcm It has to be done sometime, so i will do it next. Might as well get a start on the tuning.
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Old 09-12-2007, 09:11 PM   #224
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Out of curiosity, have you tried another pcm?
Also, tried plugging the big vacuum line that goes to the brake booster? Plug it at the intake if you can. This will give you a really hard brake pedal (hard to stop) so be sure to only test in a safe place. Though with no KR when cold I doubt its a vacuum leak but hey its worth a try.
Do you hear any ping?
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Old 09-12-2007, 09:30 PM   #225
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No i havent tried another pcm.


I just got my first chance to actually watch the scan gauge while the car is being droven. Usually i just record and watch it later. I was watching live data. Something is totally not right lol.


The KR is too random. If you brake boost off the line and smash it it sees anywhere from 6-9 KR though first and right before (actually sorta during) the shift it sees 15 and stays 15 all the way until you let off. Now say you roll into the throttle instead of brake boosting, you can see anywhere between 0-5 KR until shift. A few times at shift it would hit 15 and stay there but i would say 1/3 of the time it didnt see more then 2 degrees of KR the whole time.

Now from a roll. If you are rolling from 20 and smash it, you can see all kinds of different amounts of KR and the same as it shifts 15 and 15 all the way up. Roll from 52-56 and no KR all the way. Roll from 40 and it sees about 6-8 KR until about 4600 rpms then 15 the rest of the way. Roll from 50 or say 60 then 15 kr all the way. It is almost like it is the Tranny . Probably not but it seems when it is loaded let that be pre loading or shifts it sees the KR. So maybe it is false or real knock by the tranny.

I am so confused at this point truthfully. I mean the O2'* were all over the place. I seen O2'* anywhere from 690 to 890. Saw IPW'* of 18-23.

Also what should the O2 crosscount be?? (it was 0 the whole time)

I want to bite so hard right now on a custom pcm but i cant see spending 100if that isnt it. I am going to need 1 anyways so i mean it is still well spent money but with how limited my budget is at this point (being layed off) i dunno. I should almost wait til i get a job again (probably will be within the next 2-3 weeks) but..... by then it will take me atleast another week to catch up on bills. So that is a month from now. Umm that leaves me about 2 weeks of track time. So even if i order parts with my 2nd pay check it gives me about 1 week to recieve and get them in. Soooo i get maybe 1 time at the track before it closes. It is beginning to look like the car will not see the track again until like next april or something
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Old 09-12-2007, 09:32 PM   #226
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Sorry for all the random thoughts and confusion. Just the car is kinda getting the best of me right now.
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Old 09-12-2007, 09:34 PM   #227
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why don't you try the black car PCM its free and easy to swap ?
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Old 09-12-2007, 09:39 PM   #228
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I think i am going to try it tomorrow. I mean it could be just a screwy pcm. I mean i never had a problem with it before. But i only went to the track with this car like what 2 times, and went WOT maybe 20 at the very most. I dunno, guess it wouldnt hurt to try.
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Old 09-12-2007, 09:41 PM   #229
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Yup, you know what Bill thinks about 94 & 95 PCM'*...
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Old 09-12-2007, 09:43 PM   #230
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sometime to find a problem you need to back track go whit parts you know where ok that engine was running perfect before and i can"t see why the cam beside the ER whould make that much of a change
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