Engine Performance problem
2001 Ford F150 6 cyl Two Wheel Drive Manual 70000 miles
Upon hard or sudden acceleration the engine misses (studders). I have replaced the a/filter, fuel filter, f/pump, s/plug wires and cleaned throttle plate & mas.
It is more pronounced at low rpms at any speed. Any suggestions would be greatly appreciated!
Hi: I see you replaced the plug wires, but did you replace the plugs? Has the check engine light come on?
January, 23, 2009 AT 8:05 PM
If you did replace the plugs as well, then look into faulty emissoin system components, cracked distributer cap-if equiped, weak or faulty coil(s), vacuum leak at intake minifold or plenum or vacuum hoses. Have you gone to advanced to see if you have any codes?
January, 24, 2009 AT 10:00 AM
Replaced plugs roughly 20,000 miles ago. No check light or codes thrown. Will replace plugs and go from there. Thanks for your responses!
January, 24, 2009 AT 3:08 PM
No thats not it. Plugs onley need replaced every 30k. Have you had a loss of power. Here are some more things to check, but i'm not sure about them either (ignore number 7) Engine lacks power. See one of the following: 1.) Incorrect ignition timing. 2) Fuel filter clogged and/of impurities in fuel 3) Faulty or incorrect gapped spark plugs. 4) Air filter dirty. 5) Spark timing control system not working properly. 6) Faulty ignition coil(s) 7) Brakes binding. 8) Auto Trans fluid not correct 9) faulty distributor cap or wires 10) EGR system not functioning properly. 11) Use of sub standard fuel. 12) Low or uneven cylinder compression pressures 13) Air vacuum leak at intake manifold or plenum