doesn't down shift
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Senior User
Joined: Dec 2002
Posts: 385
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From: airdrie canada
doesn't down shift
Was towing the trailer home this morning, goin up a fairly steep hill, pedal fairly close to the metal, truck shudders very briefly, never stalled or stopped, but it won't downshift anymore even pressed to the floor boards rpm's never go above 2200, isn't over heating, oil pressure appears normal. Any ideas? Tranny problems? Truck has 259,942 km's, changed filter and fluid late May 2012. 
Thanks
Thanks
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,704
Likes: 2,625
From: SE Florida
The wrench light is a BIG clue. We need the codes to help. I suspect it is an engine problem, not the transmission.
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Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
Need a Code reader that will read wrech light codes those are more dealer specific and not generic DTC
If it was a trans issue it would likely be a Bad Tourque Converter and it usualy Drags Engine RPM Down at Idel and will cause Shudder
But it Sounds to me like its an Engine Problem to Me To
If the truck seems to work Harder at Idel and wont rev up very much might have a Plugged Exhaust.
Can you Read EBP Sensor Values???
Might try to undo the Downpipe at back turbo the Exhaust pipe that runs out the Back the Truck start it up see if it runs Better
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Thread Starter
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Senior User
Joined: Dec 2002
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From: airdrie canada
No I haven't read any values, I have a very good meter but have no idea of what any values should be. I did notice on friday, while I was hooking up trailer (I have a turbo back exhaust, no converter) it was sounding like a jet plane like normal, then it had a little rumble'burping ?? noise, then went right back to jet noise, with no converter, what could plug up? I was pushing it pretty hard while on that hill, boost was about 28 lbs. I looked for any hoses or wires to see if they were off, but found none, my son in law had a hose come off the turbo and the symptom was somewhat the same or not exact.
Thanks
Thanks
Thread Starter
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Senior User
Joined: Dec 2002
Posts: 385
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From: airdrie canada
so it was too much pedal to the metal? So a damaged turbo? I don't think its a plugged exhaust, but who knows?
Hotshot
Joined: Apr 2010
Posts: 19,055
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From: Saratoga Springs,UT
Neither do I if its Straight piped
Im with Mark being a Boost Issue
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
The wrench light could be a defuel from high ECT/EOT delta's also. If you're relying strictly on factory gauges then basically you're "driving blind".
You really need to get something to read the wrench light codes to get a proper diagnosis. Anything else and we're just guessing.
You really need to get something to read the wrench light codes to get a proper diagnosis. Anything else and we're just guessing.