Question about Ford F-150

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I have a 97 Ford F150 that has had a check engine light on for the past 3 years. Everytime and I mean everytime they do a diagnostic they tell me it is the O2 Sensor then the EGR - well I replaced them all. Then the tell me it is my spark plugs and wires - had them replaced along with the cap and new air filter - still ON. The second I can get it off I immediately take it to the shop, get the inspection and less than a day later - yup you guess it the check engine light is back on. My most recent experience to see how to get it off cost me around $1500 where they replaced or checked: Computer Diagnosis and Smoke Machine Test Pitman Arm Balljoints Solenoid Value DPFE Sensor Air Filter Fuel Filter Throttle Body Cleaner MAF Sensor Cleaning Service Manifold Hardware Again the check engine light never went off. Someone please give me another option or an idea because so far in repairs to try and get it off has cost be about $4000 in total over the last 3 years. I am tired of paying for diagnostic tests and just getting the run around of being told the same stuff.

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  • betty3791 Jun 18, 2009

    No driveability issue and I make sure to click the gas cap 3 past. Temperature runs fine. I did have the computer checked but was told they could not know for sure. I did take out 1 of the fuses and the check engine did go out but came back on once I replaced it.



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I had a similar problem with my 97 f150 4.6L. I work on it myself and after continuous check engine light with an EGR insufficient flow I replaced all 3 EGR components. (EGR valve, DTFP, and EVR regulator) Still got EGR insuffiecient flow. This Saturday I took the throttle body off (has the ports that EGR flows through) and WhaLaa!! It was totally, and I mean TOTALLY clogged with tar and gunk from the exhaust. 3 hours to clean it out and soak it and clean it all up. Fixed the problem, 300 miles later and it's still good with no codes. I have my own code reader so it made it easy to check sensors. All read "OK" now. It was worth the 5 hrs spent taking it apart and reassembling. I changed spark plugs and PCV too!! Good luck. You can do it yourself If you tell yourself you can.

Posted on Jul 14, 2009

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Ok So let me ask you, do you have any performance problems? Next did the test the catalytic converter with a temp gun? The only reason the check engine light will come on is if there is a malfunction of the emission control devices, Being an OBD II system it has to be emissions related, have they tested the computer for a malfunction? Also the panel cluster could have a short in it causing the check engine light to come on, but again I need to know if you have any drivability problems. Even a loose gas cap will cause the check engine light to come on and the canister purge valve could be leaking causing the problem post back to me about the drivability issues if you have any and if so what and if it's cold or hot.

Posted on Jun 18, 2009

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It's a common problem with the 97 ford 4.6l. most of the time it's the plug wires not sealing right around the plug, it throws fire to the nearest ground. even if you get it to seal, it won't last long.

Posted on Feb 28, 2010

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Like the first guy asked, are there drivability issues? Do you have performance drops or worsening MPG? Honestly with my experiance with FORD's especially 90's vehicles, you could spend 10k dollars and never get that light to go off. It really could be a a malfunction in the relays somewhere. basically 99% of the time FORD Check Engine lights are a mistake, a bad sensor and there isnt anything really wrong, and if there is, its something so small and stupid that it has no effect or bearing on the vehicle except to make that light come on and make you worry and spend a whole bunch of money for nothing, Unless your car starts acting up, dont worry. Thats your best bet, Those lights are "dummy lights". Too dumb to even know when something is REALLY wrong

Posted on Jul 20, 2009

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