how do i fix engine from running rich and car from bucking ?
jus t rebuilt 1986 4 cyl fiero engine. after reinstalling the engine is running rich and the car bucks as you apply the gas, i also get a oxygen sensor code . have replaced oxygen sensor and still get code, still runs rich and still bucks. i am not driving car at this time. any ideas .thanks
check egr valve
Wouldn't think a faulty egr would be to blame... Mine is blocked of and runs fine and before would leak frequently causing it to rapidly increase rpm... check injector for even spray pattern... maybe throttle position sensor... or maybe MAP sensor... also check all vacuum lines as a vacuum leak may make the engine think it's getting more air than it actually is.
Looking for a Used Fiero in your area?
CarGurus has 72 nationwide Fiero listings and the tools to find you a great deal.
Search Pontiac Fiero Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Pontiac Fiero Experts