KR maxed out on startup

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Oct 17, 2008 | 12:56 PM

animuL

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From: Wichita, KS

KR maxed out on startup

I did a search and found that several people have had this issue before but I dont see any definite answers. I never noticed this problem on my car before, but after installing the MS3 cam, when I start the car up it maxes out KR at 14* and very slowly decays. The car barely wants to idle until it gets the timing back. I've tried killing the Knock Sensors below 1600 RPM, added fuel, taken fuel out, and its always the same story. Car is a 98'

Oct 17, 2008 | 07:13 PM

animuL

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Just verified on my old log files that this was not happening before. Stock cam = 0KR at startup, install an MS3 cam, chromoly pushrods, and new valve springs and bam, 14*KR at startup.

Oct 17, 2008 | 08:01 PM

69LT1Bird

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From: Lapeer, MI

post your logs and tunes files

Oct 18, 2008 | 10:22 AM

animuL

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From: Wichita, KS

Attached tune and log

Attached Files

StreetTireTune01ModifiedforCam01.hpt (449.1 KB, 86 views)

StreetTireTune01ModifiedforCam01Log01.hpl (76.7 KB, 62 views)

Oct 18, 2008 | 11:57 AM

TAQuickness

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From: Houston

Sounds like valve train noise. Did you measure the PR's and lifter preloads?

Oct 18, 2008 | 07:48 PM

animuL

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Quote:

Originally Posted by TAQuickness

Sounds like valve train noise. Did you measure the PR's and lifter preloads?

I did not measure any preloads, never knew I was supposed to I guess. I did follow the GM torque spec procedure for the rockers tho and used loctite. I also dont hear the valve train like I have on some other cars (Mustangs

). Thing is, if it was a noisy valve train, why would it only do it on startup? It gets a few ticks every once in a while at idle, but not much. I could see it if it got a few degrees of KR on startup, but 14*?!? Who knows, if the max KR value was set to 25* it might show that. I could also see this if it only hapened after the car sat for a while and all the oil drained off the rockers and such, but I can shut the engine off and immediately restart to see the same thing happen.