Stumble & Misfire = OH Sh*$#
Thread Starter
Staging Lane
Joined: Jan 2010
Posts: 72
Likes: 0
From: northern nj
Stumble & Misfire = OH Sh*$# 94 z28 sat all winter , so took it for about an hour ride. On the way home , leaving a red light, the car stumbled, coughed, had no power, "Service engine soon" light came on, but the car ran fine after that. The light stayed on until I turned the car off, When I restarted it it ran perfect with no check engine light.
I put on free scan tried to duplicate problem , and came up with error 36 code, high resolution failure. The car started hard but ran good (but in open loop).(I don't know, what that means).
I unhooked computer and took for a spirited ride, The car stumbled, farted, and coughed under heavy acceleration and engine light came on again.
Got it home and turned it off, the (Service engine soon light), went off, so took it for two more spirted rides around the block and ran strong and hard.
I obviously have a problem, and Don't want to change out the opti unless im sure that's the problem.
Heart surgery set me back some, I cant switch without help.
Ive ordered a new opti cable, to rule out any connection problems.
And the opti is 4 years old with about 4000 miles on it (chandler), and yes, rotor srews were thread locked and outer case sealed.
Motor has no leaks.
For you guys,that probably forgot more than I know, Thank you for you help , In Advance.
I put on free scan tried to duplicate problem , and came up with error 36 code, high resolution failure. The car started hard but ran good (but in open loop).(I don't know, what that means).
I unhooked computer and took for a spirited ride, The car stumbled, farted, and coughed under heavy acceleration and engine light came on again.
Got it home and turned it off, the (Service engine soon light), went off, so took it for two more spirted rides around the block and ran strong and hard.
I obviously have a problem, and Don't want to change out the opti unless im sure that's the problem.
Heart surgery set me back some, I cant switch without help.
Ive ordered a new opti cable, to rule out any connection problems.
And the opti is 4 years old with about 4000 miles on it (chandler), and yes, rotor srews were thread locked and outer case sealed.
Motor has no leaks.
For you guys,that probably forgot more than I know, Thank you for you help , In Advance.
I know this is a little out in left field, but did you put any fuel stabilizer in the car before you stored it? If not, MAYBE you've now got a bad fuel problem....or, maybe a slightly clogged fuel filter.
Thread Starter
Staging Lane
Joined: Jan 2010
Posts: 72
Likes: 0
From: northern nj
no stabilizer, did fill with 93 bp, I guess its worth a try, would bad fuel light up "service engine soon" light??
I'm no OBDI guy but a code 36, high res failure is definitely pointing directly at the opti. Bad fuel may set a DTC, but you'd more likely see it as a cyl misfire code...
Thread Starter
Staging Lane
Joined: Jan 2010
Posts: 72
Likes: 0
From: northern nj
Bad feul And error code??? I put in some feul stabilizer and cleared the code, and seems to run great. no engine light, Just Poking and hoping no more error code.
Went for a nice ride and no problems, ?Would bad fuel pull a code???
Misfire under load, hard starting,(only when engine light is on)????
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