New CPS, no joy??? - Ford Powerstroke Diesel Forum
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Old 04-11-2007, 05:44 PM
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New CPS, no joy???

Ok I had the dreaded Powerstroke stall last week on my 99 F350. I took it in and had the codes ran, as expected it came back a CPS failure with a low boost malfunction to boot. So I told the tech not to bother with clearing the codes untill I had replaced the CPS. I got her home and installed the new CPS and she was good for about a week, I intended to go back today to get the codes cleared anyway but when I pulled into the driveway it just shut off. I made it to the shop ok, it did cut out once kinda like my foot had slipped off the throttle but no other problems. When he ran the codes, nothing, I never disconnected the batteries or anything but the codes were gone? So I did some looking under the hood and noticed a couple of things.

1. There was a in line fuse on one of the wires going from the solenoid on the passenger side that was blown.

2. There is a module mounted on the passenger side with a harness that plugs into a sensor on the fron of the turbo housing where the after cooler piping comes in, on the front of the modual there is a red tab that goes up and down, It was in the down position but looks like it's supposed to be up.

I replaced the fuse and swithched the tab up and 30 miles with no probs.

Just looking for some input I have herd of people having problems even after a new CPS, but with no codes I'm at a loss, I'm in the process of getting another spare CPS but haven't won anything on Ebay yet.
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Old 04-12-2007, 09:05 AM
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can you pust pics of the tab and in-line fuse. I never heard of an inline fuse on a factory harness...

maybe some fandangled code eliminator or home-made chip???
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Old 04-12-2007, 09:09 AM
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oh, and when the foot-off-the-pedal scenerio happened, did the truck shut off, or slow down... could be fuel filter?
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Old 04-12-2007, 09:48 AM
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This exact scenario happened to one of my friends recently. His got a new CPS..still acting funny. He went to autozone and got a "Shim-kit" for the CPS and it had 4 shims in the package. He put all 4 on it and it was worse, so he stepped it down to 2 and now he's been running fine w/ no misses for about 2 months. It has something to do w/ how close the camshaft gets to the sensor in high-mileage motors. This may not be your problem but it fixed his and may be worth a try.
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