Question about 1991 Ford Festiva
My car did the same thing. It was a problem with the EGR system, caused by the EGR valve opening too far when it shouldn't. Disconnect your EGR valve and make sure it is not stuck open. I removed mine and blocked it off with a metal shim and it solved the problem, so then I cleaned out the valve and replaced it and it worked. Check to see if it always cuts out at 3500 rpm or if its only when driving and not while parked in neutral. Also verify if it happens when the engine is cold too or only when cold, for example. Your EGR may be getting wrong signals from the EGR switch or from the EGR position sensor (EVP). You must verify that the EGR is the problem. If its not, it might be a coil problem loosing output at high energy demands. You also could have a fuel volume problem. At high fuel volume demands, the fuel quantity can't keep up. So you see, its a tricky problem to troubleshoot. If none of that worked, run the car at 3500 rpms and pull off each spark plug wire (one at a time) and see which cylinder does not cause a change in engine speed. That would be the problem cylinder and probably that fuel injector.
Posted on Oct 04, 2009
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Posted on Jan 02, 2017
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