how do i fix engine from running rich and car from bucking ?

Asked by Mar 20, 2013 at 05:31 PM about the 1986 Pontiac Fiero SE

Question type: Maintenance & Repair

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

2 Answers

25

check egr valve

295

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.

Your Answer

Add photo

Related Questions

  • how do i fix engine from running rich and car from bucking ? 2 answers

    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...

    1986 Pontiac Fiero SE

    -

    Maintenance & Repair

  • How to remove gas from 84 fiero? 6 answers

    How do I remove fuel from the tank of an 84 fiero se without dropping the tank? I've heard about connecting a hose near the fuel pump, and I've also heard siphoning, but i can't get a hose deep en...

    1984 Pontiac Fiero SE or Indy

    -

    Maintenance & Repair

  • fuel isnt coming out of the carburator and the car wont stay running. 9 answers

    So my fiero has been sitting for 7 years and i recently wanted a project, so i got it out and started working on it. The car cranks but it wont fire up. I had someone turn the key while i poured a l...

    1984 Pontiac Fiero Base

    -

    Maintenance & Repair

  • Car doesn't stay running 14 answers

    I have a 4-cyl pontiac fiero se. It's been sitting for about 7 years. when I first started to work on it, it wouldn't run. I took the carb apart, cleaned all the parts, soaked the injector, and pu...

    1984 Pontiac Fiero SE or Indy

    -

    Maintenance & Repair

  • idle rough and cuts off after running car for a extended period of time 1 answer

    V6 engine, Car runs great but after running car for a period of time, when stopping it starts to idle rough and cuts off, starts right back up with no problem, sometimes when put back in gear cuts bac...

    1988 Pontiac Fiero Formula

    -

    Maintenance & Repair

Fiero

Looking for a Used Fiero in your area?

CarGurus has 66 nationwide Fiero listings and the tools to find you a great deal.

ZIP:

Search Pontiac Fiero Questions

Pontiac Fiero Experts

#1 Andrew Welsh
Andrew Welsh
Reputation 230
#2 THORNY68
THORNY68
Reputation 220
#2 Steve Neyens
Steve Neyens
Reputation 220
View All

Related Models For Sale

Used Chevrolet Corvette
149 Great Deals out of 20,682 listings starting at $3,995
Used Pontiac Firebird
4 Great Deals out of 768 listings starting at $1,791
Used Ford Mustang
543 Great Deals out of 45,840 listings starting at $1,999
Used Chevrolet Camaro
244 Great Deals out of 31,183 listings starting at $369
Used Toyota MR2
17 listings
Used Dodge Charger
454 Great Deals out of 29,317 listings starting at $2,300
Used Nissan 300ZX
130 listings
Used Toyota Supra
53 listings starting at $32,500
Used BMW 3 Series
939 Great Deals out of 30,253 listings starting at $1,000
Used Toyota Celica
4 Great Deals out of 368 listings starting at $1,511

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.