WOW. Didn't see that one coming! Congrats to you on your persistence.Originally Posted by 67SS509
Mr. P.
WOW. Didn't see that one coming! Congrats to you on your persistence.
Mr. P.
Highlander wins the prize! Well done.
Howard
YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
DUCT TAPE.
IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.
98 K1500 'HOLDEN' Suburban.
Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit
Good work.
The Tremor at AIR
It appears that Highlander did indeed...see posts #89 and #196......good job...
This would have shown up on the oscilloscope waveform... as the crank walks away from the CKP sensor the reluctor produces a weak signal... the waveform would have shown either a decreasing amplitude or incorrectly shaped ripples... the trick is having a good signal waveform as a reference to compare against... and a scope with a high resolution display.
The Snap-On scope display isn't quite high resolution... but maybe it did show us a few clues... see attached image (from scope display in post #86)... this is at low rpm (I calculate ~21 Hz = ~1260 rpm)... compare the waveform shapes with a known good waveform (square-tops, all same amplitude, 3rd image)... at higher rpm the amplitudes would have dropped further and the pulses would have become more mis-shapen.
Last edited by joecar; October 28th, 2009 at 04:36 PM.
The trick is knowing what to look for... and then it's easy...
man, had feeling that was going to be the end results. i guess running a motor on street ride is not as abusive as running it in a drag car. i wonder if that is a common failure due to high reving launches or is it just an assembly/tolerance issue from the start.
04 gto 243 gmpp cnc ported heads , hot cam 219/228 .525 112, kooks 1 7/8 l/t,lm-1wb, sending unit for fuel press. logging, drag bags for the track na 12.2@112mph 1.77 60ft. new add ons 42lbs lucas injectors, lpe walboro, daves wet plate kit, purge,heater, fpss, wot sw., fjo mini controller,nano, new p/b on hoosier 275/40/17 10.998@126.49mph,1.588 on 103vp, 18* timing 11.2 afr. n150w bassani catbk. catless with ls7clutch.
The converter for various reasons (ballooning, line pressure excessive, insufficient clearance, ...) it puts forward pressure on the crank bearing thrust surface causing it to wear prematurely... there are other causes.
Here's but one article: http://www.artcarr.com/page/news/1.acpp
thanks for the info. i wonder if a carburated/distributor type motor would have shown any signs, like the efi set-up did.
No signs at all... except maybe bearing metal presence in the oil.
and falling oil pressure!
2002 Chevy truck, SCSB 2WD, Stroked LS3 w/Big Mutha Thumper cam
2002SS Camaro LS7/427 with stock suspension setup
2012 Chevy truck, SCSB 2WD, Magnaflow exhaust + K&N
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