Question about 1990 Mercury Grand Marquis
Runs fine under 2800 rpms, when accelerating getting over 2800 rpms, the engine trys to cut out.
Try several things...
Fuel injector cleaner
New fuel filters
Check for vacuum leaks
New spark plugs and wires
Posted on Jan 17, 2015
CHECK THE COLD START ENRICHMENT VALVE AND OR THE IDLE CONTROL VALVE. I AM ASSUMING THAT YOUR VEHICLE IS FUEL INJECTED. ONE OF THOSE HAVE GONE BAD.
Posted on Jan 24, 2009
SOURCE: wont start after warmed up
here are things to do.
Clean MAF sensor wires with carb cleaner and toothbrush carefully. This will remove varnish.
Check under distributor cap and rotor (1 screw) and under slotted plate. If brown dust, you need new distributor. Clean optical sensors for cam sensor before re- assembling. Temporary fix only.
Check ECT, engine coolant temp sensor.
Have Autozone run free computer scan for fault codes.
Finally, go here for expert Villager support
Posted on Jun 02, 2009
So he the mechanic said that your timing belt was off and gave it a tune up instead..Unplug your mass air flow sensor which is located in the air filter duck work or in the filter its self.Its should be the only 3 to 5 wire plug in the air cleaner or the piping from that to the intake.Now with that unplugged start it and drive it .If problem is gone the tats your problem.If it jumped a tooth on timing it would run bad all the time.But if he says it the sensor could possibly be and just working than not working.Try this and see if it helps you..
I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_a3369546f8067589
Posted on Mar 31, 2009
Have a mechanic take a look at your throttle position sensor and engine idle sensor. Make him manually adjust them as opposed to just putting in new ones. It may require that you have to have a higher idle than normal. Your underlying cause is going to be that I am sure you have a lot of miles on your engine.
Posted on Jul 20, 2009
since the code is the circuit malfunction and just not the sensor recheck the wiring and connections may have a bad connector or a break in wire also check the crankshaft sensor wiring and connections which is also part of circuit
Posted on Dec 13, 2009
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