poor running fiero
Posted: Mon Apr 06, 2015 3:36 pm
HI everyone, I'm new here but not new to cars. I have a problem with my stock 86 2.8 fiero gt. This car has never seen a winter and still has its original exhaust.
To get right to the point, cylinders 2,4,6 plugs are black and it blows black out the tailpipes. Plugs 1,3,5 are perfect, light brown no issues. I have been over this car with a fine tooth comb but have run out of ideas. To review the things I have done, I have done a complete tune up, rebuilt the heads,(was under 100 on the front head, now 150 psi per cylinder x 6). Taken off the exhaust at the manifolds to check for a blockage (nope not that). I have tested the 6 pin weather pack at the injector harness and it tests good. I have a obd 1 scanner and it shows I'm running rich.
One thing that has got me baffled is that if I pull injector fuse 1 which controls injectors 2,4,6, the car dies right away. I put the fuse back and pull injector fuse 2 which control injectors 1,3,5 and the car keeps running without any change.
The car starts like a champ and will idle all day long, not perfectly smooth but not bad, I find it does rev high (approx 1200). When I put it into drive (basically under a load), the idle gets real rough and the car stalls out within 10 seconds
I'm looking for ideas where to go from here.
cheers
To get right to the point, cylinders 2,4,6 plugs are black and it blows black out the tailpipes. Plugs 1,3,5 are perfect, light brown no issues. I have been over this car with a fine tooth comb but have run out of ideas. To review the things I have done, I have done a complete tune up, rebuilt the heads,(was under 100 on the front head, now 150 psi per cylinder x 6). Taken off the exhaust at the manifolds to check for a blockage (nope not that). I have tested the 6 pin weather pack at the injector harness and it tests good. I have a obd 1 scanner and it shows I'm running rich.
One thing that has got me baffled is that if I pull injector fuse 1 which controls injectors 2,4,6, the car dies right away. I put the fuse back and pull injector fuse 2 which control injectors 1,3,5 and the car keeps running without any change.
The car starts like a champ and will idle all day long, not perfectly smooth but not bad, I find it does rev high (approx 1200). When I put it into drive (basically under a load), the idle gets real rough and the car stalls out within 10 seconds
I'm looking for ideas where to go from here.
cheers