problems with 99 SD..stalls out only when raining or wett - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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post #1 of 19 (permalink) Old 02-13-2007, 07:16 PM Thread Starter
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problems with 99 SD..stalls out only when raining or wett

My truck keeps suddenly cutting off only when its wet outside or raining,runns fine all other times,anyone know what this could be ,thanks
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post #2 of 19 (permalink) Old 02-13-2007, 07:26 PM
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Re: problems with 99 SD..stalls out only when raining or wett

[ QUOTE ]
My truck keeps suddenly cutting off only when its wet outside or raining,runns fine all other times,anyone know what this could be ,thanks

[/ QUOTE ]Bad connection to the CPS ? Water in the PCM? just a thought....

Rick.....
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post #3 of 19 (permalink) Old 02-13-2007, 08:06 PM
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Re: problems with 99 SD..stalls out only when raining or wett

Yep what ^^he^^ said. Sometimes you can unplug the CPS (hopefully not on the side of the road in the rain) and coat the connections with grease to create a better seal and cure the problem. Other times it's a windshield leak running down on the PCM.
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post #4 of 19 (permalink) Old 02-13-2007, 08:59 PM
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Re: problems with 99 SD..stalls out only when raining or wett

I guess you guys drive through 1' of water all day cause I've never seen a PCM get wet, unless he missing an inner fender completely.

I have seen the IDM get wet, and cut a truck off when raining.

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post #5 of 19 (permalink) Old 02-13-2007, 09:30 PM
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Re: problems with 99 SD..stalls out only when raining or wett

I have just finished towing my 99 F-350 up the driveway with old faithful 1989 F-250. My 99 cut off coming down the driveway tonight. It was raining, I did not think it was too bad, the wind was up and as I was going downhill and then uphill, it cut off. Towed it into the driveway and after sitting level it fired up. I guessed it was water related, but logged in to see if anyone else had this problem.Is this just happening to 99's?

1989 F-250 4x4 7.3 C-6 315000 miles and counting-sold
2001 Excursion Limited 4x4 7.3 165000 miles-new transmission-12-24-12
2008 F450 XLT CC 4X4 4.88 gears 11' Reading Service Body 168000 miles-too nice to be a work truck-new engine, 5th radiator
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post #6 of 19 (permalink) Old 02-13-2007, 09:38 PM
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Re: problems with 99 SD..stalls out only when raining or wett

I have a 2001 F-250 and mine would cut out when it rained real hard.So I changed the cps about a month ago and it has'nt cut out since. Is it flashing a check engine light? Whenever mine cut out it would flash the check engine light. I ran a code and it came back cps code.

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post #7 of 19 (permalink) Old 02-13-2007, 09:52 PM
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Re: problems with 99 SD..stalls out only when raining or wett

I did not notice if the check engine light flashed, I will drive it tomorrow-its my work truck- and see if it happens again. thinking about putting some dielectric grease in CPS connector just to make me happy [img]/ubbthreads/images/graemlins/grin.gif[/img]

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2008 F450 XLT CC 4X4 4.88 gears 11' Reading Service Body 168000 miles-too nice to be a work truck-new engine, 5th radiator
2001 F250 4X4 Lariat CC bought April 2011 185000 miles
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post #8 of 19 (permalink) Old 02-13-2007, 10:23 PM
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Re: problems with 99 SD..stalls out only when raining or wett

I have an early 99 that started acting up only when it was raining out. I changed out the cps and it's been running great ever since.

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post #9 of 19 (permalink) Old 02-14-2007, 08:42 AM
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Re: problems with 99 SD..stalls out only when raining or wett

My 99 350 did almost the exact same thing. I changed the CPS (very easy job btw)and it fixed it no questions asked. I am not sure exactly how the moisture effects it but it did.

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post #10 of 19 (permalink) Old 02-14-2007, 09:22 AM
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Re: problems with 99 SD..stalls out only when raining or wett

[ QUOTE ]
I guess you guys drive through 1' of water all day cause I've never seen a PCM get wet, unless he missing an inner fender completely.

I have seen the IDM get wet, and cut a truck off when raining.

[/ QUOTE ]You have ,I'm sure , heard of leaking windsheilds..Mine got wet that way...

Rick.....
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post #11 of 19 (permalink) Old 02-14-2007, 10:50 AM Thread Starter
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Re: problems with 99 SD..stalls out only when raining or wett

hmm,good info here,whats strange is,it does not have to be raining hard or raining at all,if its just wet outside it does it.also it does not do it while driving,only at idle when stoped,while driving it just sounds like a miss for a sec,then drives fine till the next stop. I assume the cps,is the cranck position sensor? where is it located in this truck,and does it need to be replaced like some have done or just the plug greased or sealed
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post #12 of 19 (permalink) Old 02-14-2007, 11:41 AM
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Re: problems with 99 SD..stalls out only when raining or wett

Does it do it when the wipers are on or just when it is wet out?

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post #13 of 19 (permalink) Old 02-14-2007, 11:52 AM
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Re: problems with 99 SD..stalls out only when raining or wett

[ QUOTE ]
hmm,good info here,whats strange is,it does not have to be raining hard or raining at all,if its just wet outside it does it.also it does not do it while driving,only at idle when stoped,while driving it just sounds like a miss for a sec,then drives fine till the next stop. I assume the cps,is the cranck position sensor? where is it located in this truck,and does it need to be replaced like some have done or just the plug greased or sealed

[/ QUOTE ]The CPS is on the rt front of the motor by the bigest pully, 1 plug two wires . clean the connections & seal them with dialectric grease & see what happens.... click here ....

Rick.....
97 F 350 ...Lucky 13
"Most stuff's just stuck & needs hittin with a hammer .Supporter/End user of ShiftSolutions THE CURE E4/4R Trans Control. Helping Cancer patients and families
Special thanks to RacerX USA

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post #14 of 19 (permalink) Old 02-14-2007, 04:54 PM
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Re: problems with 99 SD..stalls out only when raining or wett

[ QUOTE ]
hmm,good info here,whats strange is,it does not have to be raining hard or raining at all,if its just wet outside it does it.also it does not do it while driving,only at idle when stoped,while driving it just sounds like a miss for a sec,then drives fine till the next stop. I assume the cps,is the cranck position sensor? where is it located in this truck,and does it need to be replaced like some have done or just the plug greased or sealed

[/ QUOTE ]
It is the CPS. For what ever reason, when weak, high humidity causes them to act up. You can search and you will find just about every case of these trucks shutting down in the rain is cured by replacing the CPS.

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post #15 of 19 (permalink) Old 02-14-2007, 04:56 PM Thread Starter
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Re: problems with 99 SD..stalls out only when raining or wett

ah camshaft sensor,I see. thanks for the pics that makes it easy.

I notice it with or without wipers running? why would that matter?

what is it doing when wet,missing a fire cycle? seems that way.
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