Question about 1984 Pontiac Fiero

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84 Fiero. trouble starting and runs rough and the surges/stalls

My car has trouble starting and runs rough and the moment I use the throttle it bogs down and stalls out. I changed alternator, MAF,TPS,Ox, sensors. ECM, plugs, wires, coil, Distributer cap. Replaced EGR valve and fuel relay switch. Made sure the car has clean gas in it. Problem started while cruising at about 70km and thats when car started losing power and surging and havent been able to get it running right since.
I thought from reading forums that it woulda bin the MAF or EGR valve. Could be the fuel pump but by watching the throttle body it seems to be getting fuel no problem but hey Im not a expert. Hope you can help.


Posted by on

  • cliffhopkins Aug 01, 2010

    Replacing fuel pump now. Just waiting for the part to come in. I mean what else can there be. Strange how there is fuel going to the injector but maybe its not the right amount cause of a malfunctioning pump. Here's hoping it works.
    The Engine is the Iron Duke 2.5. If the pump doesnt work I fear what the problem could be lol My guessing is at its end.
    thanks for the tip with the pump.



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It sounds like a fuel pump. Check the fuel pressure. What size engine?

Posted on Aug 01, 2010

  • Clint Smock
    Clint Smock Aug 02, 2010

    Fuel pressure should be 11-13 psi on a 2.5



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