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1999 Pontiac Grand Prix SE 3.1 P0440, P0303 Codes
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luke11492
New User
Nov 21, 2011, 12:13 PM
Post #1 of 1
(3461 views)
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1999 Pontiac Grand Prix SE 3.1 P0440, P0303 Codes
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I have a 1999 Pontiac Grand Prix SE 3.1 Liter with engine light codes P0440 and P0303
P0440: Vacuum Leak
P0303: Cylinder 3 Misfire. Which doesnt make sense because I have very new coilpacks, wires, and sparkplugs which worked fine when installed and I have FULL power all my horses are still there
What happen (important please read):
Well nothing really, I went driving about 85 Miles to and from and I stopped alot for long periods of time so it wasnt a consistant trip
I'm parked idleing when I get home and I noticed the engine light was on so I go to autozone and get it diagnosed and those codes came up
Misfire I dont believe because I have full power and everything is new there is no rough idleing at all I smell gas sometimes but not always and for some reason my engine temperature gauge is going up and down (slowly but not accurate) my coolant is topped off, new, and not leaking
(This post was edited by luke11492 on Nov 21, 2011, 12:15 PM)
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