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Engine running lean 88 Chevy 454

Tiny
MRPEESHY
  • MEMBER
  • 1988 CHEVROLET TRUCK
I have a 1988 Chevy 1-ton that has a 454. After removing the exhaust and replacing it with a better breathing dual system with no cat the truck is running lean. The distributor and O2 were replaced and the timing set correctly but the truck runs lean on the road and makes the manifolds glow red. I have tested the EGR and it is working correctly. I have put a vacuum on the egr solinoid and I get no vacuum when the engine RPM is increased. Could this be the problem? What else could make the truck run this lean?
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Monday, April 23rd, 2007 AT 9:20 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The solenoid should pass vacuum to the EGR when accelerated.
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Friday, April 27th, 2007 AT 4:53 PM

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