my first Z! running rich...
#1
my first Z! running rich...
i just bought my first Z today. its a 1990 N/A 2-seater 300ZX. i hope i can find some good help here! so i got this car, and from the minute i stood beside it i could tell that it was running rich. soot build up on the bumber, fuel smells, and an estimated mileage of 17 mpg out of this N/A with 150,000 miles. i have a few ideas about potential causes. O2 sensor, spark plugs, air filter, and if the car hates me, maybe leaky fuel injectors. i don't really know how to go about tunign the car, seeing as my last was a "78 MG Midget. any advise on fixing this problem would be appreciated. i don't know how to find which thing it is. anythign else to look for on a 150,000 mile car would be appreciated.
#5
To add to your list....a few more basics....new fuel filter and clean your throttle bodies. Just don't go cheap....use OEM wherever possible. I would be willing to a venture a guess that the PCV valves are in need of replacement as well. A little Sea foam wouldn't hurt either.
Other than that....enjoy the ride.
Other than that....enjoy the ride.
#6
yeah, thats what i did on my car when i had teh Z32, ran seafoam through both sides of the plenums something else and carb cleaner to. makes lots of white purty smoke lol. theres a write up on twinturbo.net on how to clean out your junk in the engine/plenum/throttle boddies/valves and what not
#8
well i think i fixed it. incase anyone was wondering, the temp. sending unit wiring harness was pretty burnt up. a little dielectric grease and a bend of the pliers and my carbon build up problem is gone.
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