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

HELP!!! Running very rich!

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Old Dec 30, 2001 | 03:34 PM
  #1  
PonyH8R's Avatar
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Default HELP!!! Running very rich!

Hey all. Well I must have done something wrong. I decided it was time to clean the engine of my 86 and also replace a hose that blew going to the bottom of the throttle body. So I removed the intakes and also replaced my valve covers with chrome ones and cleaned the engine. All through this I took pictures so I would make sure I put everything back. Well I must have done something, now the poor thing runs rough and is burning very rich. Makes my eyes burn.

Does anyone have any ideas for me? I checked the vacuum lines and they seem to be fine. The sensors are all plugged back in. I do not get a service engine soon light.

I took it out for a test drive and the cars rpms keep getting higher. So at this point I am lost.

Thanks for any and all suggestions.

Kam :crazy: :confused:
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Old Dec 30, 2001 | 05:34 PM
  #2  
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From: Lafayette IN
Default Re: HELP!!! Running very rich! (kghott)

Check the Cold start switch connector and the ECT sensor connector which are both right on the front of the lower manifold right below the throttle body.

Either of those connectors being unplugged or not seated could easily cause a rich condition. The ECT connector looks like the IAT connector and the CSS looks like a fuel injector connector. Good luck, -Matt-
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Old Jan 3, 2002 | 10:04 AM
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Default Re: HELP!!! Running very rich! (kghott)

My 85 did this right after I washed the engine. Water had gotten in the TPS. A new TPS, plus adjustment made the problem go away.

Just a thought.
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Old Jan 3, 2002 | 10:12 AM
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From: Springfield MO
Default Re: HELP!!! Running very rich! (NHVett)

I would check your tps voltage as well as your IAC counts. The Idle air controller will make your car run too rich at idle if its not functioning correctly.
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