Random cylinder mis fire and tcc unlock
10-26-2008, 10:01 PM
#1
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Random cylinder mis fire and tcc unlock i took my car to the track on saturday amd after 6 or 7 passes my check engine light came on random cylinder misfire was the code then when i left i noticed the torque converter lockup wasn't working i had the predator hooked up so i hit clear codes and it stayed locked for about 5 miles then unlocked again no check engine light but i cleared the codes and continued this every 5 miles on my was home i got home and check the plugs they looked good then i double checked to make sure the wires were on good and went for a drive and the same thing happened it would unlock the tcc and at a steady 3000 rpm you can hear a strong mis. i would like to drive it with out clearing the codes but the trans starts to get warm with out being locked up. any ideas
thanks blake..
thanks blake..
10-28-2008, 07:44 AM
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You may have compound problems. Misfires will
inhibit TCC lock. A TCC that won't ever lock,
but gets better at every key-on and then quits
again may be seeing a slip code (P1870?), this
faults into a never-lock mode. But maybe you
are just misfiring full time, like the nitrous ate
a plug tip or something. I'd start with pulling
them and see. And do that leakdown or at
least a cranking compression while the holes
are open.
inhibit TCC lock. A TCC that won't ever lock,
but gets better at every key-on and then quits
again may be seeing a slip code (P1870?), this
faults into a never-lock mode. But maybe you
are just misfiring full time, like the nitrous ate
a plug tip or something. I'd start with pulling
them and see. And do that leakdown or at
least a cranking compression while the holes
are open.
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10-28-2008, 04:34 PM
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With a stock cam you ought to see over
130# I think; high overlap cams will be a
lot less. Key is more the consistency from
cylinder to cylinder, if one is way less
than the others it's got a problem.
130# I think; high overlap cams will be a
lot less. Key is more the consistency from
cylinder to cylinder, if one is way less
than the others it's got a problem.
10-29-2008, 08:13 AM
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Actually the crank sensor is used to figure
whether misfire is occurring, a failed crank
relearn or a flaky sensor can drive bogus
misfire detects. I don't think the crank
sensor plays any role in actual misfiring.
But it does, in the counts.
whether misfire is occurring, a failed crank
relearn or a flaky sensor can drive bogus
misfire detects. I don't think the crank
sensor plays any role in actual misfiring.
But it does, in the counts.
