99 F350 reving issue - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 05-27-2014, 02:52 PM Thread Starter
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99 F350 reving issue

I have a '99.5 F350 CCLB 4x4 with 160k miles. I've only had the truck about 6 months and it didn't have this problem when I got it but I don't remember exactly when the problem started happening. But anytime I turn the truck on and it's cold the check engine light will come on. After about 20-30 seconds the light will shut off and the RPM's will jump about 200 or so. The RPM's jumping and check engine light going off happen simultaneously. If I drive the truck for a while, turn it off and then turn it back on before the engine cools to much this doesn't happen, only when it's a cold start. Does anyone know what this could be?

1999 F350 4x4 Crew Cab Long bed. 240k miles and bone stock as of now. Looking to change that soon
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post #2 of 6 Old 05-27-2014, 03:42 PM
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have you pulled codes?

-Vance-
.2002 f350 Lariat 4" lift w/ 35's. Hydra w/PHP. Swamps 175/146 injectors. gauges. banks power elbow, 4" dp 5"out,RiffRaffs FRX ww, ccv, AIH delete riff raff boost port, '10 tailgate mod amongst a bunch of other goods
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post #3 of 6 Old 05-27-2014, 03:52 PM
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Do you have the latest and greatest cps? That'd be my first guess.




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post #4 of 6 Old 05-27-2014, 04:00 PM Thread Starter
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I haven't had a chance to pull codes yet.

And what do you mean by cps?

1999 F350 4x4 Crew Cab Long bed. 240k miles and bone stock as of now. Looking to change that soon
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post #5 of 6 Old 05-27-2014, 04:21 PM
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Crank Position Sensor. About 20$ from Ford




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post #6 of 6 Old 05-27-2014, 04:28 PM
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beings as theres been a check engine light, id start off by pulling codes. for what its worth, its always good to have a CPS in the glove box

-Vance-
.2002 f350 Lariat 4" lift w/ 35's. Hydra w/PHP. Swamps 175/146 injectors. gauges. banks power elbow, 4" dp 5"out,RiffRaffs FRX ww, ccv, AIH delete riff raff boost port, '10 tailgate mod amongst a bunch of other goods
.B&W turnover/ companion to haul my 2001 Prowler 5'ver. Home away from home
I.B.E.W. Local 1002


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