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

Puzzled!!!!

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Old Nov 10, 2008 | 07:19 PM
  #1  
RG86VET's Avatar
RG86VET
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Default Puzzled!!!!

I NEED SOME ADVICE,
I REPLACED THE STARTER AND THE FUEL FILTER THIS WEEKEND AND THATS IT. NOW WHEN I START THE OLE 86 I GET A TERRIBLE RATTLE SOUND FROM UNDER THE CAR AT IDLE AND NOW WHEN I ACCELERATE IT DOWN SHIFTS BUT NO PICKUP ,FEELS LIKE IT HAS NO POWER AND I GOT A SLIGHT "EGG" SMELL FOR A SECOND.
THE CAR IDLES FINE BUT NOW POWER UNDER WOT

PLEASE HELP
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Old Nov 10, 2008 | 07:44 PM
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Check your fuel pressure at the fuel rail. Should be about 44psi or so.

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Old Nov 10, 2008 | 07:48 PM
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RG86VET
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I just noticed the air pump hose has came loose from the converter.

The car operates fine under normal conditions but at wot feel like no power

a bad converter perhaps??????
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Old Nov 10, 2008 | 09:21 PM
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engle1147
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Originally Posted by RG86VET
I just noticed the air pump hose has came loose from the converter.

The car operates fine under normal conditions but at wot feel like no power

a bad converter perhaps??????
I'm not sure if your car has 2 pre cats and the main cat (the one with the air pipe). Clogged cats could be the issue but those things don't usually go bad over night. If you want to swap it out I have a brand new never been used High Flow cat converter posted in the C4 parts for sale section for a great price.

I'm still leaning toward the fuel pressure check first. Get a hold of a fuel pressure gage and check the pressure at idle and leak down times with the key off.

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Old Nov 10, 2008 | 10:09 PM
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Fuel filters are directional. Installed correctly?
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Old Nov 11, 2008 | 12:53 PM
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The rattle and egg smell definetly sounds like the cat, and it would also cause the performance issue you're describing.........my money is on the cat.
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Old Nov 11, 2008 | 03:14 PM
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hey lambert. in ref to the filter , it had a out printed on it no arrows
i put the out towards the front of the car. i hope its just a cat
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