cold start idle problem
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New User
Joined: Dec 2009
Posts: 6
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From: West Virginia
cold start idle problem
99 E350 7.3 PSD. It starts fine, but when temps are 35 and below as it's warming up it revs and hisses and revs and hisses and revs and hisses until the motor reaches operating temp. If you try to drive it before the temp gauge reaches operating temp, it drives the same way (revs and then when it hisses it loses power, then it revs and when it hisses it loses power). I took of the cowel and it sounds like the hissing is coming from under the turbo. I can see an arm of some type that moves with the revving and the hissing. What is the problem?
Postmaster
Joined: Dec 2008
Posts: 3,340
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I think a cat got stuck in your exhaust...lol.....No that is normal when cold the ebpv closes most of the way to help warm up the truck faster. This is the flap on the exhaust side of the turbo to the down pipe. Also, I think it is trying to high idle which is normal. If you press on the break the high idle should go back down.
Lead Driver
Joined: Jan 2007
Posts: 6,708
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From: Kiowa CO
Does your RPM's fluctuate as well when it idles? My old '99 PSD did that and I cleaned my EBPS and it went away.
Welcome to guzzle's Exhaust Backpressure Sensor Cleaning Maintenance Web Page
Welcome to guzzle's Exhaust Backpressure Sensor Cleaning Maintenance Web Page
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New User
Joined: Dec 2009
Posts: 6
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From: West Virginia
Chris: The RPM's do fluctuate.
Grant: If I touch the brake pedal, even with just my finger, it returns to a smooth idle for a short time and then continues to fluctuate again until warm.
Does that sound right?
Grant: If I touch the brake pedal, even with just my finger, it returns to a smooth idle for a short time and then continues to fluctuate again until warm.
Does that sound right?
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