CPS Woes?
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Senior User
Joined: Oct 2006
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From: Spicewood, TX
CPS Woes?
Early '99 (6/98) - Truck quit like flipping a switch. Suspected Cam Position Sensor. Replaced CPS, no joy. Ran codes, got 340 (CPS failure). Changed to another CPS, no start, ran codes, got 340 again (CPS fault). Good on oil & fuel pressure, cranks fine.
At this point, suspect wiring (piched, shorted, broken, burned, etc) or PCM.
We've done a lot of work in and around the harnesses, e.g. multiple change-outs of I/C pipes, boots, etc; changed out the turbo twice; new glow plugs; new harnesses, 6.0L cooler swap, R&R both intakes and reseal...may have knocked something loose? 130K on engine, original CPS (now new), recent oil change, re-torque oil and trans pans bolts, new fuel and air filters, recent install of AFE Stage 2 airbox, SS HPOP crossover, fuel pressure at 70, Magnaflow exhaust - and a myriad of other "little" TLC things.
Any experience with this puzzle? Any thoughts?
Thanks in advance.
At this point, suspect wiring (piched, shorted, broken, burned, etc) or PCM.
We've done a lot of work in and around the harnesses, e.g. multiple change-outs of I/C pipes, boots, etc; changed out the turbo twice; new glow plugs; new harnesses, 6.0L cooler swap, R&R both intakes and reseal...may have knocked something loose? 130K on engine, original CPS (now new), recent oil change, re-torque oil and trans pans bolts, new fuel and air filters, recent install of AFE Stage 2 airbox, SS HPOP crossover, fuel pressure at 70, Magnaflow exhaust - and a myriad of other "little" TLC things.
Any experience with this puzzle? Any thoughts?
Thanks in advance.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Is it a Ford or aftermarket CPS? The ones from the auto stores have been known to cause problems.
You may not be able to do all of these checks, but here's some info on the wiring that includes a few tests you can do.
You may not be able to do all of these checks, but here's some info on the wiring that includes a few tests you can do.
Thread Starter
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Senior User
Joined: Oct 2006
Posts: 483
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From: Spicewood, TX
Ford or aftermarket CPS?
Tried a gray and a black CPS - both from Ford, both are "post" recall and brand-new in the package.
Excellent document by the way. We'll look at these in the morning.
Thanks.
Excellent document by the way. We'll look at these in the morning.
Thanks.
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