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  1. Replies
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    Interesting, I hadn't thought about that. To...

    Interesting, I hadn't thought about that. To offset the "used" up exhaust gases being introduced into the combustion chamber. Controlled by "EGR fuel reduction vs RPM vs Vacuum"... right? I have set...
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    Would this be the "EGR Spark Correction vs. RPM...

    Would this be the "EGR Spark Correction vs. RPM vs Vacuum" in the $0D mask?
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    No, I've definitely done more that just disable...

    No, I've definitely done more that just disable the error code 32. Over time, in desperation i guess, I started adjusted things just to see what it would do, if anything. Here is the list of EGR...
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    Another thing I keep going back to in my...

    Another thing I keep going back to in my head...Was eliminating the EGR a mistake? Has anyone ever had this knocking issue because they eliminated the EGR or cured knocks because they reinstalled...
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    I checked my distributor, I guess I over...

    I checked my distributor, I guess I over exaggerated a little. 0.055" vertical play and 0.005" side to side. I don't believe either is really bad enough to contribute to spark scatter. I'll shim...
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    Big...I've checked my timing at least a handful...

    Big...I've checked my timing at least a handful of times just to be sure, so I think it's good but I am going to pull my dizzy out tomorrow to check shaft end play. Read a few great threads on a...
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    Thanks to the guys who have responded....I've...

    Thanks to the guys who have responded....I've tried or checked just about everything suggested in one form or another but no luck. I'm running out of ideas, I may just pull the engine out and go...
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    I considered what you said so I found a timing...

    I considered what you said so I found a timing table posted in a thread that was a little more aggressive than a stock vortec table, but my results are still the same...knock counts and some...
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    Fast...the negative values were from my timing...

    Fast...the negative values were from my timing losing 10 degrees because of the Altitude Spark Bias. I don't have the table available to me right now but I would swear that the standard vortec table...
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    So I looked at my spark advance table from my...

    So I looked at my spark advance table from my last datalog run and compared it to my timing table in my bin and it is approx. 10° off. Thinking "how could I have missed this before" I played back...
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    Not all that common but I have heard a regulator...

    Not all that common but I have heard a regulator spring can break or just get weak and not hold pressure. What was your pressure before?
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    OysteinB...have you had any luck solving your...

    OysteinB...have you had any luck solving your knock issues?
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    Is it a good idea to shut off the knock sensing?...

    Is it a good idea to shut off the knock sensing? I ask because I have knock retarding issue with my 7427, $0D, that I haven't been able to tune out by adjusting timing. I'm on the road now but when I...
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    I'm going to have to read that a few times to...

    I'm going to have to read that a few times to grasp it all...but i will try that and see what happens. Thanks!

    I may have another issue though. Looking at my spark advance in my latest data log...
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    Big....It is certainly worth looking into. ...

    Big....It is certainly worth looking into.

    Btw, Brian, I double checked and I have already made those changes for eliminating the EGR. I thought I had...I'm sure I read to do it on a thread...
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    Pretty sure I made those changes to the egr but I...

    Pretty sure I made those changes to the egr but I will double check my file when I get home.
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    I had thought about double checking the...

    I had thought about double checking the adjustment on my rockers but Is a knock sensor that sensitive that it will retard the timing because of rocker arms or lifters being a little noisy?
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    Timing ...help!! 94 k1500, 5.7, $OD, 7427

    So, I've got knock counts...alot of them... and I keep getting a handful of cells showing knock retard. I'm starting to think my issue is probably mechanical (bottom end) but I am hoping I'm...
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    When PE is active it will command an AFR that is...

    When PE is active it will command an AFR that is equal to your TPS for PE vs RPM table. Mine ranges from 12.1 to 12.6.
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    Thanks...I think I am going to do the same as you...

    Thanks...I think I am going to do the same as you and stay with the factory curve, at least for now. Maybe later once I have a better feel for what i am doing I'll experiment with varying PE AFR's ...
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    So...has anyone else tried using different PE...

    So...has anyone else tried using different PE AFR's for different RPM ranges like suggested below?

    "A good PE AFR for a truck would depend on the TPS for PE vs. RPM. Low TPS for PE you would...
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    Turbo on your Blazer...nice!

    Turbo on your Blazer...nice!
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    My timing is still a work in progress but right...

    My timing is still a work in progress but right now not very aggressive (see below). I'm getting some knock retard in 5 or 6 cells at WOT so I will need to dial that back a little I guess. I was...
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    Adjusting Power Enrichment

    I have tuned my VE tables on my 94 K1500 and have gotten them pretty close, all within 122-130 (though a couple of cells seem to have strayed a little on this run). Anyhow, I've re-enabled PE, hooked...
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    Well, i thought about it and decided to order an...

    Well, i thought about it and decided to order an ignition control module ...the symptoms match so we'll see. I'm still concerned it could be the ECM but I feel a little better knowing I can get one...
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