20 Most Recent 1985 Pontiac Fiero - Page 2 Questions & Answers

I think you should probably rebuild the throttle body if you have not. Over time, some serious **** can build up in the body and also, the gaskets can shrink due to age which can cause fuel blockages in the body its self.

Can you describe the problem ? Have you checked the idle air control valve ? Is the throttle body clean ?

I had a problem with backfiring and what I found was my oxygen sensor had the wire pulld out. Being there was really no room to work I just spliced a new good wire on it and shoved the wire down in the sensor. It helpd a lot. But use a good wire. "Not speaker wire" because of the heat from the maniflod

Ok neither one have you have owned a fiero, there is no fuse box under either hood, and the ecm is in the center console! The fuel pump is run by the ecm and the fuel pressure switch to check the fuel pump apply 12 volts to the aldl connector inside your center console. all you have to do is take the little black cover off of the console where the cigar lighter is at. There are only 4 wires its the one that is farthest away from all the others. If you hear the fuel pump turn on then the fuel pressure switch is probably the culprit. I would get some schematics and check wires though. Odds are since it was in an accident there are probably some screwed up wires.

You would check for power in and out of the switch. No power to the switch would be checked at the fuse. If you have power in and out of the brake switch you would follow it to the turn signal switch if that bulb handles both circuits.

What all have you replaced? And what is you hydrocarbon lvl?

Ignition coil when dies. check for spark if there is no spark replace it

it could be the speedo cable could be worn or the cluster itself could be bad

try the fuel presure regulater it should be on the fuel rail ( that is if it is the V-6 ) it hasone vacum line on it and it has i think like 6 screws holding it in. it will cause just that same problem it will also cause it to flood at idle and foul plugs and make it idle rough you may have to chage the plugs also. you might check the vacum to. it should run on stright vacum from the intake.

they do not make adapters for the ECM plugs, you will have to get the matching one for that car

In order to replace the cam gear, you have to take it to a machine shop and have it pressed on and off.

1985 Pontiac Fiero 2.5 liter L4





1985 Pontiac Fiero 2.8 liter V-6





Hope this helps (remember to rate this answer).

Hope this helps.