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

94 service engine light

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Old Aug 10, 2010 | 02:52 AM
  #1  
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Default 94 service engine light

So service engine light was coming on almost every time I drove.
If I was driving slow it would die but restart after some cranking.If I was driving faster it would just stall momentarly but keep running. The A/C would stop blowing cold after the light came on. The last codes I got were H72,H36,H42,&H62 . I cleared these codes once but H 62 would not clear. (Engine oil temp sensor circut voltage low.) Last time I drove the car I barely made it home. It started back firing badly. When I got home I noticed what looked like a ceramic pellet resting in the exhast tip (catalytic converter?) Also the top radiator hose was expanded and some rusty water had sprayed out,I let the water get rusty so I need to know the best way to flush the whole thing out. I also put an MSD opti spark in and I noticed the intake hose was loose and I'm wondering if it sucked any crud into it.That would make it back fire for sure,anyway any help would be apreciated.Rick
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Old Sep 15, 2010 | 10:21 PM
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Originally Posted by llesg
So service engine light was coming on almost every time I drove.
If I was driving slow it would die but restart after some cranking.If I was driving faster it would just stall momentarly but keep running. The A/C would stop blowing cold after the light came on. The last codes I got were H72,H36,H42,&H62 . I cleared these codes once but H 62 would not clear. (Engine oil temp sensor circut voltage low.) Last time I drove the car I barely made it home. It started back firing badly. When I got home I noticed what looked like a ceramic pellet resting in the exhast tip (catalytic converter?) Also the top radiator hose was expanded and some rusty water had sprayed out,I let the water get rusty so I need to know the best way to flush the whole thing out. I also put an MSD opti spark in and I noticed the intake hose was loose and I'm wondering if it sucked any crud into it.That would make it back fire for sure,anyway any help would be apreciated.Rick
Hi buddy, when was the last time you had your alternator checked? I threw all those same codes right before my alternator crapped out on me. Replaced alternator, cleared codes, PRESTO!!!! As for the coolant, I would spend the money to have a shop pressure flush all the crap out. I've tried several times to flush my system out with water and have never been able to get the stuff as good as a pressurized flush.
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Old Sep 16, 2010 | 12:25 AM
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Old Sep 16, 2010 | 10:21 AM
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Black pellets? That sounds to me like your catalytic converter's let go and is clogging your exhaust system.
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