Shudder problem - Ford Powerstroke Diesel Forum
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Old 03-01-2010, 07:17 PM
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Shudder problem

OK here's my story. 03 6.0L w/ ~150K miles no real issues up until about 4 months ago. I started feeling a shudder once i was up to ~70 mph and backed out of the throttle slightly. If I got back on the accelerator enough to kick into passing gear the shudder goes away.

So I took it to a couple places and they dont have any real answers but recommend a new EGR Valve and ICP Sensor. I replace still have problem.

I try another place and they say the alternator voltage is low maybe not getting enough voltage to the computer so i change the alternator. Still have problem.

One day on the way home i hear some horrible noise in the tranny so i take it to a tranny shop. They inspect and the O/D is out of spec so i have a soft parts tranny rebuild kit put in. I am towing a 5th wheel so I have my torque converter replaced at the same time. Still have shudder problem.

So now i just feel like im never gonna get it fixed. I am heading up to Globe this weekend towing the trailer up a pretty steep grade and decide since i have this new tranny to step into it and see how it handles it. A few miles into the climb, POW. I loose power but engine still running, i look in mirror for fluid on the road but there is none. I find a pull out to get the trailer off the road and shut her down. I crawl underneath and tranny looks OK. I pop the hood and all looks OK. Decide to head back down off the hill. Engine wont start. Upon further inspection I end up finding the intercooler hose blown off. 5 minutes, put it back on engine starts and all is well.

Long winded story to get to my real questions.

1) If intercooler hose is blown off is there a sensor that keeps engine from starting?

2) Shudder problem is now gone. Could that coupling have just been leaking and causing the shudder and not blown off until i got a good sustained load on the turbo?

thanks
bob
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Old 03-01-2010, 07:26 PM
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That is strange. Mine shuddered, but was the EGR.
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Old 03-01-2010, 07:28 PM
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By shudder do you mean turbo surge?
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Old 03-01-2010, 07:29 PM
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so your problem is now fixed? im kinda confused
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Old 03-02-2010, 05:28 AM
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I was confused too, that's why i posted the questions. It seems now that I have re-attached the intercooler hose my starting problem and shudder has gone away.

I don't know what turbo surge is but the shudder i had felt more like the engine was missing and was only at that certain rpm or load. If i got up to 70 backed my foot like i was just gonna cruise at 70 then just tried to speed up slightly it would shudder. If i put my foot in it hard the shudder would go away.

thanks for your help
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Old 03-02-2010, 06:18 AM
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I just took my truck to the dealer for a shutter on the highway, they replaced the EGR valve, the EGR cooler (mine was cracked), and the #3 injector.

she runs great now
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Old 04-05-2010, 05:59 AM
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I am having the same type of shudder but it is between 50 and 55 and it is only when I am in the throttle.
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