February 12, 2006my truck has an idle problem it idles rough then it starts running great then its back too running rough. using a lot of gas, and when at normal operating temp. it runs very rich . and seems like its holding back then at a certain rpm it takes off until its at a constant speed .engine light just stays on now i have already changed the tps, egr, mass air flow sensor, both coil packs plus a tune up, and the, dpfe,evr. and checked the fuel pressure, and changed all hard lines to new rubber lines . my first ford ( 98 ford f-150) and i`m ready to burn please help
Forums : General Tech Questions : Running out of options! (182 Views)
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February 16, 2006Try plugging in a scan tool and check the readings on the O2 sensors, as well as all the other sensors, while the engine is running. This will let you know which one is causing your problem.