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CATEGORY LISTINGS > FORD DIESEL > No acceleration when cold, Is backpressure servo stuck? [ REFRESH ]
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No acceleration when cold, Is backpressure servo stuck?


Created On Wednesday January 03, 2007 17:19 Diesel Talk
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mtjcarpenter
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Joined: Mar 2006

Note Wednesday January 03, 2007 17:19 View thread in raw text format
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97 7.3l is lacking acceleration when cold. Usually takes 10 minutes to heat up and return to normal acceleration. There is much built up soot on turbo pedestal, hissing noise is associated with occuring problem. Could the servo that controls this valve not be operating incorrectly?
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GoneFishen
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Posts: 1325
Joined: Jan 2007

Note Friday January 19, 2007 22:44 View thread in raw text format
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There is a valve that closes when the engine is cold. It is controled by the pcm and needs air,oil temperature readings from the engine to open the valve. If the noise goes away after a warmup then the valve is operating normally. Mine is working this time of year also. Several people have disconnected it and made it into a retarder of sorts. Mine is still connected and will stay that way until it quits then I will either hold it open or remove the guts from the inside.

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DDA tech for 30 years,all 2 cycle,series 60,50 mbe also.
1995 F250, 191k mi.
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