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fuzzy1
User
Jan 17, 2012, 4:39 PM
Post #1 of 5
(1855 views)
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wipers shut engine down
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Here is yet another stumper. I have a 1999 Ford F450 superduty 7.3 turbo diesel with 215000 miles. This truck runs like a champ but for a long time has had an ocasional dieing problem.(would die but start right back up). About 2 months ago it finally spit out a code for a cmp sensor. The sensor was replaced and the truck still had the ocasional dieing. Now here is where the problem comes in. For the last month you can drive the truck as usual and its good to go untill............................. you turn on the windshield wipers. Its seems now that my dieing problem is related to the wipers. Here is todays experiment and results. I hope this will help you to help me.
Started engine at 2 pm ran for 15 minutes with wipers off, engine ran fine. The next 15 minutes the engine ran with wiper delay set for 10 seconds and engine died 5 times.
The next 15 minutes ran without wipers and engine ran fine. For the last 15 minutes with wipers on the engine almost died 5 times but caught itself and stayed running but near the end of this time period it did die 1 time. Everytime the engine died it would throw a P0344 code. Says intermittent problem in cmp circuit. I am awaiting a breakout box to pursue testing but if anyone has any shortcuts or clue me in on the wiper issue I would appreciate it. I did print off the wiring diagram for the wiper circuit and it does not in anyway connect to the engine magement system so Im lost here.
Thanks.
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 17, 2012, 5:33 PM
Post #2 of 5
(1825 views)
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Re: wipers shut engine down
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When you replaced the cam sensor, did you use dealer part?
Could be the wiper motor is generating EMI that is somehow messing with the cam signal to the PCM. You would have to hook up an oscilloscope to watch the cam signal to see if there is interference or you have some sort of connector or connection problem. I've also read about the PCM's 5 volt reference power supply getting shorted by various sensors that use that voltage and causing the PCM to set cam codes and stalls. Probably wouldn't be a bad idea to watch the 5 volt power supply on one of the sensors to be sure its not being pulled down. You'll need a scope or meter with min/max sitting on the 5 V reference circuit recording when the fault occurs.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jan 17, 2012, 5:42 PM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 18, 2012, 5:09 PM
Post #4 of 5
(1770 views)
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Re: wipers shut engine down
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The problem with a volt meter is that it isn't fast enough to catch glitches. The volt meter averages out the voltage that comes out of the cam sensor. If a glitch occurs or you have noise in the circuit, you won't see it with a volt meter.
I heard of a lot of techs having problems with aftermarket sensors on those. Most recommend using the factory part.
I've also read of the EBP sensor pulling down the 5 volt reference circuit on those and causing cam codes to pop up. You really need to find a way to monitor the live signals on those circuits.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jan 20, 2012, 3:16 AM
Post #5 of 5
(1749 views)
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Re: wipers shut engine down
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Sorry folks for no post and you'll get a notice of a reply made. Just a spammer - gone now,
T
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I should also add the computer had been repaced Feb 2011 for a dieing problem but nothing related to the wipers. Computer was also aftermarket and it did fix the problem at that time. 