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Posted on Jan 02, 2017
SOURCE: ford ranger 3.0l 1999
The knock is because the EGR not opening or its passages in the intake manifold are plugged. And the Knock is causing the KNOCK SENSOR to ****** the timing to reduce detonation Test the egr by hooking up a vacuum pump to the egr and while idling pump vacuum the engine should stumble and nearly die until you release the vacuum. If it does not or the EGR will not hold vacuum first if it will not hold vacuum replace the EGR then test like I described a bit earlier, If the engine does not stumble at all you need to clean the EGR passages and sometimes this means removing the intake plenm and cleaning that way whic is actually the best and only way to completely remove all the carbon and while you are there replace the PFE SENSOR Or sometimes known as the BACKPRESSURE SENSOR If you need parts only BUY ORIGINAL EQUIPMENT FORD PARTS BECAUSE FORD HAS SO MANY UPDATES THAT ONLY FORD HAS THE MOST CURRENT PARTS !!!!!!!
If this information helps and it will prove to be correct I have done this hundreds of times while I owned my diagnostic shop for 14 years here in Seattle,
Please give me a fixya Rating Thanks and if you need further help please contact me Thank you, Randy
Posted on Aug 26, 2008
SHOWING MISFIRES ON SCAN TOOL?IF NOT,ENGINE CONTROLLER HAS NOT LEARNED MISFIRE MONITOR..WILL HAVE TO BE DRIVEN A BIT FOR RELEARN..IF YOU CAN SEE MISFIRES..MISFIRING ON MORE THAN 1 OR ALL CYLINDERS?CHECK UNDERSIDE OF IGNITION COIL FOR CRACKS..IF NOT CRACKED,YOU MAY HAVE A FAULTY CRANK SENSOR..ANY CORRODED PLUG WIRES AT DISTRIBUTOR CAP?ALSO CHECK IF ANY OIL PRESENT IN INTAKE MANIFOLD..GASKET ON BOTTOM OF INTAKE MAY BE BROKEN CAUSING AN INTERNAL VACUUM LEAK
Posted on Jun 22, 2009
My gas petal used to stick on the jeep so i spray up in there on the petal to stop it from sticking ore the brake light woud stay on becuse petal got stuck try some WD40 just dont sray on your petal ok might work
Posted on Jul 21, 2009
my 1994 had the same problem,where the TPS sensor connects there is a small rod that moves you should be able to see it without taking anything apart it wsa rusty and sticking so i sprayed it with wd-40 a couple of times and that solved the problem for me,don't know it that will help but maybe it's worth a try. or maybe your throtle cable to the gas pedal has worn a grove inside the cable and you can't see this problem,but atleast have it checked to see if it's sticking.
Posted on Oct 28, 2009
Testimonial: "I HAD THE UNIT TPS OFF LAST SUMMER AND TESTED IT AND IT SEEMED TO BE SHOWING ACTION WHEN I USED THE VOM ON IT. I WILL CHECK FOR RUST AND STICKING "
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