C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Has anyone had this problem?

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Old Feb 13, 2004 | 12:14 PM
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Default Has anyone had this problem?

New member enjoying corvette forum very much, I have a problem I need help with.My 93 starts and runs fine cold, as soon as it reaches normal temperature it starts running very bad,feels like I'm puling a big trailer when I accelerate,misses,hesitates,backfires.I took it to dealer they said it was computer,still no change.I have a few mods,KN,160 thermo,hypertech,355 gears,no mufflers,60,000 miles.I'm thinking optispark,its original.Anybody have anyother ideas?
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Old Feb 13, 2004 | 12:17 PM
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Default Re: Has anyone had this problem? (ItsAVett)

When you saw no mufflers does that mean you forgot or removed the O2 sensors in the front of the exhaust system? Might have to do with them. :flag
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Old Feb 13, 2004 | 12:27 PM
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Default Re: Has anyone had this problem? (ItsAVett)

Any engine codes? My 92 had 44K on it when I replaced my optispark. It was a mess inside and I vented the new one.

WELCOME TO THE FORUM :hurray:
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Old Feb 13, 2004 | 12:29 PM
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Default Re: Has anyone had this problem? (VictorRussell'92)

I ment i removed mufflers and replaced with pipes everthing is intact.this problem arose much after all mods were made. :banghead: :banghead:
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Old Feb 13, 2004 | 12:31 PM
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Default Re: Has anyone had this problem? (Strick)

No codes
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Old Feb 13, 2004 | 01:00 PM
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Default Re: Has anyone had this problem? (ItsAVett)

OPTI most likley
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Old Feb 13, 2004 | 04:18 PM
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Default Re: Has anyone had this problem? (ItsAVett)

A clogged cat will cause problems the more it warms up to the point where the car almost has no power. Something to look into if it is not the computer.
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Old Feb 14, 2004 | 12:14 PM
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Default Re: Has anyone had this problem? (ItsAVett)

1st welcome.... the CATS have been know for alot of those issues... something to check...
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Old Feb 14, 2004 | 12:22 PM
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Default Re: Has anyone had this problem? (C4-Wolf)

I was told by the dealer that cats were OK. HELP! :banghead: :banghead:
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Old Feb 14, 2004 | 12:42 PM
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Default Re: Has anyone had this problem? (ItsAVett)

If it's idling roughly and you suspect ignition problems, clip a timing light onto a spark plug wire to see if the miss coincides with missed flashes.
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Old Feb 14, 2004 | 02:06 PM
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Default Re: Has anyone had this problem? (VictorRussell'92)

OPTI most likley
:iagree:
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Old Feb 14, 2004 | 06:01 PM
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Default Re: Has anyone had this problem? (GS057)

Had similar symtoms on my 87 when maf sensor went bad.
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Old Feb 14, 2004 | 06:07 PM
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Default Re: Has anyone had this problem? (Pete K)

Are you getting any black smoke? If you are it's the O2 sensors, but it's odd your getting no codes.
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Old Feb 14, 2004 | 06:09 PM
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Default Re: Has anyone had this problem? (Pete K)

Had similar symtoms on my 87 when maf sensor went bad.
:cheers: I am having similar problems now with my 88 and it seems to be in the MAFcircuit. Getting codes 33 & 34, but diagnostic tests say the Maf sensor itself is OK, ground is bad.

I replaced relays and now the problem is intermittent and the car runs great as long as it doesn't get an "intermittent"! When it does, it runs like limp home, but as soon as I clear the code, it runs great again

go figure

:seeya

:steering:
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Old Feb 15, 2004 | 07:18 PM
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Default Re: Has anyone had this problem? (jackdaroofer)

MAF checks out OK,still no codes.I'm still thinking OPTI? :banghead: :banghead:
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