Hi All
My Service Engine Soon Light keeps coming on. This is the 4th time. The dealer can not find any codes.They clear the light it will be ok for a while, then all off a sudden the light is back on.
The truck is running fine, idles perfect, no loss of power, or any driving problems. After the 2nd time I put on a K&N fipk, when it went on the third time, the dealer cleared the computer, but said because of the K&N they could not figure out what was wrong.
So I put the stock intake back on, and a few weeks later the light is back on.

Anyone have any ideas what is causing the Service Engine light to come on, and what can be done to keep it coming on.
I tried disconecting the battery for a few hours, but the 2nd or 3rd time you start it after the battery is disconected the light comes back.
Thanks
Don

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1999 F150 4x4 4.6V8 regcab/shortbed
Oxford White with Wedgewood Blue two tone, with Blue Captains chairs
Bullet Cat Back, Superchip, K&N FIPK Intake.
Centerline Saber rims 17x8" with Firestone GTA 275/60hr-17 tires.
Alpine CDA-7845, ADS P640 Amp, Focal Poly Kevlar seperates.


http://members.tripod.com/donf150/Welcome/id7.html




[This message has been edited by Don C (edited 11-23-2000).]

 

Hello Don,

I bought a 2001 F150 that had the same problem. The "Service Engine Soon" light came on but the truck seemed to be running just fine. In my case, it was a faulty cam positioning sensor assembly. The part number was 1W7Z-6B288-AA. The following is from the work order:

"C/S Service engine soon light on when driving
WDS, EEC Test, P1000/P0340, WDS Diagnostics - Cam Sensor fault - Monitor found to be ok at this time - Install 104 pin breakout box, checked sensor circuits, ok. R&I Cam sensor, test with ohm meter, reading ok until cool down. Then goes open until room temp. and then it is ok again. Replace sensor and RE EEC Test ok"

I hope this helps. Good Luck.

 

Did they find any codes on your truck?
Every time the light comes on the dealer scans the truck, but no codes come up.
They can not find any problems, and this is getting frustrating.

 

Have you tried cleaning the MAF sensor?

Good luck

 

E Mac
Thanks I cleaned it and so far so good, will see if it comes on in the next day or two.
Da feel like a jerk, I had it out the other day but never cleaned it. Lets hope the light stays off.

 

Clean the MAF ans air temp sensors...if it comes back on, I'd bet it's an O2 sensor...failing that, the Cam Pos. sensor very well could be it.

-AR

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2001 F-150 XLT 4X4 Off-Road, S/C, FS, Black[*] 4.6L Triton V8 HPI[*] 5 Speed / 3:55 Reg. Axle[*] Keyless[*] Premium Audio CD

Mods:[*] K&N Cold Airbox / Throttle Body Mod.[*] Flowmaster 40 (3" x 20" "Turn-Down") [*] Cranked Torsion Bars[*] APC XENON PLASMA Super Whites[*] Bugshield[*] Bedliner[*] Ventshades[*] "Light Argent" 4X4 Off-Road Decals[*] K&N & Flowmaster Stickers (Under the Hood)

Audio:[*] Rockford Fosgate G360A2 Punch Amp[*] JL 12W3-D2 (JL ProWedge Box)

Build Date: 8/23/00 (Kansas City Plant)

arobbins@mail.liberty.k12.mo.us