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Thread: So the wife & I are driving along

  1. 11-12-2011 #1
    Duffster
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    So the wife & I are driving along

    minding our own business just about to decide what dinner plans we had and suddenly the engine starts bogging at constant throttle. Not cruise control, but foot control (no cruise any longer). About 2K rpm, 3rd gear (th400) and 4.30 rear ratio so about 35ish mph. Few back fires, more bogging/studdering from the engine and I saw some smoke popping w/the backfires (I suspect just cleaning out carbon...) Anyway, I managed to get the last mile home with the engine calming down for a few minutes then repeating and dying. Got the last few blocks bogging and studdering again. Got into the garage and pulled the valve covers, looked for leaks everywhere, checked fluid levels, nothing obvious. Rockers and springs appeared to be fully in tact. No issues with leaks. . . nothing.

    Pulled out the HP and recorded a few moments of running. During the log attached the engine died twice (as you might observe). I copied the DTCs as well and have included it too.

    I welcome thoughts.

    GMPP intake, Aarons elbow, Lunati 55008 cam shaft (237/242 .642/.644 with 1.82 roller rockers), LT headers, 3" exhaust, TH400 trans, TCI super street fighter converter, 4.30 rear 10-bolt.
    2001 Z28 (Black-6 Speed converted to 4L60E) - Holley Hi-Ram LS3 Iron 6.0 bored/stroked 408 Forged Internals 11.4:1CR (anticipate 475+RWHP) Moser M9 35-spline Posi Strange center 3.00:1 gears - Best 1/4 Mile: 12.18 @ 113.15 (3360# race weight) when near stock --- No new times yet ---
    BMR tubular front L/U a-arms and k-member. UMI Adj. T/A and adjustable rear LCA's, Spohn PHR and Dragbar. !Air!,!P/S!,!TCC/ABS!.
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  2. 11-12-2011 #2
    mecanicman
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    Crank sensor codes seem like a pretty good place to start, you have 2 and they would explain your description of how it runs. Bad sensor, damaged wiring, to much crankshaft endplay.....
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  3. 11-12-2011 #3
    Duffster
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    Alright, crank sensor appears good in place, wires good, crank moves on .0007, .0008 and .0011. Changed out my passenger O2 on a friends read of the logging...

    Worked much much better. short logging here.

    Thanks for sure. I'll get to the crank sensor tomorow and I'll insulate the wires (about 1.5" from headers....)
    2001 Z28 (Black-6 Speed converted to 4L60E) - Holley Hi-Ram LS3 Iron 6.0 bored/stroked 408 Forged Internals 11.4:1CR (anticipate 475+RWHP) Moser M9 35-spline Posi Strange center 3.00:1 gears - Best 1/4 Mile: 12.18 @ 113.15 (3360# race weight) when near stock --- No new times yet ---
    BMR tubular front L/U a-arms and k-member. UMI Adj. T/A and adjustable rear LCA's, Spohn PHR and Dragbar. !Air!,!P/S!,!TCC/ABS!.
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  4. 11-13-2011 #4
    Duffster
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    Alright, took it for a brief spin this afternoon and had speedo for the first time since the trans swap. Minor tweek needed there but irrelavant here.

    About 1:20 into it I let off the gas and the O2s both dropped down and 1:25 the advance dropped to 0 as the engine died. It didn't do the backfire or lurching thing as last night, just simply died. waited a few seconds, restarted and all was fine from what I saw...

    Any thoughts on this?
    2001 Z28 (Black-6 Speed converted to 4L60E) - Holley Hi-Ram LS3 Iron 6.0 bored/stroked 408 Forged Internals 11.4:1CR (anticipate 475+RWHP) Moser M9 35-spline Posi Strange center 3.00:1 gears - Best 1/4 Mile: 12.18 @ 113.15 (3360# race weight) when near stock --- No new times yet ---
    BMR tubular front L/U a-arms and k-member. UMI Adj. T/A and adjustable rear LCA's, Spohn PHR and Dragbar. !Air!,!P/S!,!TCC/ABS!.
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  5. 11-13-2011 #5
    Duffster
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    Took for a bit more of a spin and made more adjustments to the abs/vss tuning...
    2001 Z28 (Black-6 Speed converted to 4L60E) - Holley Hi-Ram LS3 Iron 6.0 bored/stroked 408 Forged Internals 11.4:1CR (anticipate 475+RWHP) Moser M9 35-spline Posi Strange center 3.00:1 gears - Best 1/4 Mile: 12.18 @ 113.15 (3360# race weight) when near stock --- No new times yet ---
    BMR tubular front L/U a-arms and k-member. UMI Adj. T/A and adjustable rear LCA's, Spohn PHR and Dragbar. !Air!,!P/S!,!TCC/ABS!.
    Reply With Quote Reply With Quote
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