Loss of Power, Wait to Start Light while driving - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 04-24-2014, 11:17 AM Thread Starter
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Loss of Power, Wait to Start Light while driving

I ignored this problem for a couple months and just parked the truck for the rest of winter.

Ever since I replaced my clutch, I have been having this random loss of power and the "Wait to Start" light comes on, and I release the gas, then press and it truck regains power. Some times it does it again almost immediately, some times at different intervals. I never really get much past 20 miles per hour if that.

The last time I tried to mess with it, it was doing it while idling, which was not happening originally.

After it sat for a month and warmed up. I started it on a nice day. It started with no issue, and I drove it a couple miles around block, and no problem. I think parked it for about 2 weeks since I didn't have time to risk a problem.

I started it today, let it idle for at least a half hour while I gathered tools to put in it before taking it to pick up some supplies. Didn't hear an issue at all. Then right as I pulled onto the road, it started happening. And happening bad. I turned around and brought it back. Parked, turned it off for a minute. Then started it back up, and drove it for several miles without any issue.

Now I am afraid to go any further and risk a problem.

At some point after clutch, I did replace the Camshaft sensor since it was cheap and easy.

Last person I talked to says a computer issue. Since it appears it thinks the glow plugs need to come on. It there a thermostat somewhere that might be reading wrong and causing the glow plugs to kick on? I ask because of the inconsistency. The first day I drove it fine, it was warmer than today.
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post #2 of 3 Old 04-24-2014, 09:32 PM
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No thermostat, no temp sensor. The WTS light is just a light, not tied to teh glow plugs. The GPs probably are turning on as well, however. The PCM decides on the WTS and glow plug run times (two different time periods) based on the EOT sensor, but ONLY when you FIRST turn the key on. So what's probably happening to you is that you're getting an intermittent interruption in the main switched power to the PCM. Either a loose wire connection, a fuse that's not fully seated (fuse #22 under the hood, IIRC), or a bad connection in the ignition switch.

Another remote possibility is the key itself moving slightly, shutting off power to the PCM for a split second. Does the cylinder feel normal when you turn it? Not loose, or sticky, and definite click stops in each position? You don't have a huge wad of keys on the key ring by any chance, do you?
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post #3 of 3 Old 04-30-2014, 02:25 PM
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check your UVCHs and the wiring from the IDM to them

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)

Originally Posted by alberta 7.3 View Post
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