I have done the basic. plugs wires and the seafom but still a bad idle sounds as if its missing on all cylinders and not alot of power? i did just get it so dont know much on history. im guessing now either bent valves or out of time. Can u PLEASE help???
SOURCE: replacing timing belt 91 mercury capri
according to a manual , the crank key will point to arrow , the intake cam should have an letter i aligned with arrow on belt cover and exhaust cam should have letter e aligned with arrow on belt cover , and as always rotate the engine 2 full turns to inspect timing marks before cranking or trying to start the engine . if you haven't taken the original belt off yet , paint your marks for quicker reference .
SOURCE: 2001 Mercury sable bad idle
CHECK THE PCV VALVE HOSE THAT CONNECTS AT THE BOTTOM OF THE THROTTLE BODY, THESE HOSES ARE KNOWN TO DETERIORATE AND ALLOW UNMETERED AIR TO ENTER THE COMBUSTION CHAMBER, WHEN THIS OCCURS THE OXYGEN SENSOR'S SIGNAL TELL THE PCM TO INCREASE THE PULSE WIDTH OF THE INJECTORS CAUSING THE VEHICLE TO ALMOST STALL.
SOURCE: Running Rough: P1131 & P0171 DTCs
They both refer to oxygen sensors, but a lot of times a dirty mass airflow sensor is the cause. Get a can of Tuner cleaner spray from electronics store, or radio shack & remove battery cable (Neg - ), then remove MAF sensor and clean it well with the spray & let it sit & dry out for 1/2hr or so, then re-install & try it. Careful with the wires, they break easy. I don't recommend carb or brake cleaner be used, because they leave residue, which kinds of defeats the purpose of cleaning it.
SOURCE: I have a 2002 mercury cougar (v6) it has a miss
Engine miss can be caused by lots of things. f this has coil on plug ignition system it cold have a bad coil. This can be checked with a cheap "spark checker" that looks like spark plu with the center electrode removed and a aligator clamp welded to the side of the nut. It takes 30-35k volts to fire this thing so if your coil will fire this then it will fire the plug. Then check the sides of the spark plug boots for white spots where it has been arching out to ground. I good then it could be a dirty injector with a bad spray pattern, vacuum leak on that cylinder, but one the first things to check is to make sure you have good copression. no compression or intermittent compression from poor seating/sticking valves, weak springs, the list goes on, no or low conpression= misfire . need to figure which cylinder is causing first.
SOURCE: engine light on, idles rough. had engine light diagnosis.replaced
See if you can get the codes. If it is still number 4 only (probably a P0304) it could be the fuel flow through injector 4. Try some Techron cleaner and make sure number 4 plug isn't fouled. Also get the compression checked on number 4.
If not, it could be the ignition control module assuming all other changes have been made. If you get a code it will help. A P0300 would point toward the ICM. If it is number 4 only it could still be the ICM. Expect around $150 for the module if you do it yourself. The ICM may be under the coil pack. If you are getting a P1361 and/or P1362 it could be the Cam position sensor. They are around $40 and are usually near the number one cylinder. Mine is hiding under the water pump pulley. It is a Buick with the 3.8 engine but the principal is the same.
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