Shudder problem - Ford Powerstroke Diesel Forum
 
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post #1 of 7 Old 03-01-2010, 07:17 PM Thread Starter
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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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post #2 of 7 Old 03-01-2010, 07:26 PM
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That is strange. Mine shuddered, but was the EGR.

Kevin
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post #3 of 7 Old 03-01-2010, 07:28 PM
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By shudder do you mean turbo surge?

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post #4 of 7 Old 03-01-2010, 07:29 PM
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so your problem is now fixed? im kinda confused

2007 F250 king ranch 6.0 powerstroke
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post #5 of 7 Old 03-02-2010, 05:28 AM Thread Starter
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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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post #6 of 7 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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post #7 of 7 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.

05 250 PSD
Crew Cab short bed
4" MBRP exhaust with cat delete
35x12.5 on 18" black XDS's
Sinister EGR Delete
SCT with SLR Tune

105K miles

Not much, just a DD.
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