Did you check the IMRC - intake manifold runner control system ? Do you know what this is ? Plastic clip breaks , actuator rod falls off . Video's on youtube .
SOURCE: 92 mercury tracer runs when cold, once warm dies
have you check your coil? when coil get hot they will break done .i had a car that did the same thing . and it was the coil . check your fuel fulter ok . have a good day.
SOURCE: 99 mercury sable automatic trans vehicle
Sounds like a broken or torn vacum hose, pcv valve clogged, or bad Idle air control motor. Did you spray carb cleaner on vacum hoses or near the plastic intake., and did the motor rev up or down? Those codes represent a lean condition which means most like a vacum leak or clogged idle air motor. Sometimes the intake manifolds crack or the intake manifold gaskets crack. FInd that vacum leak or inpect iac motor
SOURCE: 1987 mercury cougar 5.0. When
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
SOURCE: 3.0 LITRE V-6 STARTS AND IDLES GOOD.ENGINE SURGES
go to villager quest yahoo group for expert help. Sounds like a dirty MAF sensor. Clean heated wires with carb cleaner.
TPS readngs are good.
fuel pressure should be 43 engine off, and 34 engine running.
try disconnecting front oxygen sensor for a day & see if better.
Read All ABut files at our site.
gerry
SOURCE: 1999 Cougar w/2.5L V6 Duratec engine. Engine
Does it rev up if you spray carb cleaner into the throttle body to boost fuel supply ? Any chance its a vac leak ?
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