Question about 1987 Mercury Cougar

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1987 mercury cougar 5.0. When the engine is started cold, it stalls after 30 seconds. To keep it running, you have to rev the engine until it is warmed up. While reving the engine, it feels like it misses and it backfires a bit. Once the engine is fully warmed up, it idles and drives fine. The air charge temp sensor, engine coolant temp sensor, MAP sensor, and idle speed control motor have all been replaced within the last 2 weeks and I still have this problem. Could the problem be the EGR valve be the problem?

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Hi,
plug the EGR line and see how it acts. better yet put a ball bearing in that line and reconnect it to the EGR and see if it goes away. definate vacuum issue somewhere. tranny modulator, check every line coming off the firewall manifold. the throttle position sensor might need to be replaced. its one of the only moving sensors under there. on my 89 tempo I could adjust my idle, move that idle screw around so it idles up a bit to get it out of that dead area on the TPS. plug wires after that. those notchbacks are getting extremely rare, and with a V8! put it far far away....

jm

Posted on Mar 20, 2011

  • Jude Meredith
    Jude Meredith Mar 20, 2011

    vacuum advance on the distributor, check for leak also.. forgot..jm

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