What up with this?
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Junior User
Joined: Dec 2006
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What up with this?
My '99 7.3 2wd a/t has developed this just recently. When the truck is fully warmed up, I get a subtle shake while stopped with my foot on the brake. If you put it in park it goes away, put it in reverse or drive it comes back. But that is the only time you feel it. Any ideas anyone??
Mountain Pass
Joined: Jul 2007
Posts: 187
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From: Watkins IA
Give us a few more details...like only when warmed up, where do you feel the shake, in the steering, brake pedal, or the whole truck. How about in neutral instead of park? On acceleration or only at idle? Be patient, someone will help.
Posting Guru
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From: Kamloops, BC
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Tuned
Joined: Mar 2009
Posts: 356
Likes: 10
From: South East PA.
My '99 7.3 2wd a/t has developed this just recently. When the truck is fully warmed up, I get a subtle shake while stopped with my foot on the brake. If you put it in park it goes away, put it in reverse or drive it comes back. But that is the only time you feel it. Any ideas anyone??
Dan
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Junior User
Joined: Dec 2006
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Could you drive it unplugged if the pcm is in default??? I forgot to mention I have Jody's 80 hp econo setting burned into my pcm. I also had a p1211 code last week. The truck acts fine except like sitting at a red light, there just seems to be more shake than normal. What about a sticking IPR valve and I have read where those can be removed, cleaned and re-installed??
Tuned
Joined: Mar 2009
Posts: 356
Likes: 10
From: South East PA.
Could you drive it unplugged if the pcm is in default??? I forgot to mention I have Jody's 80 hp econo setting burned into my pcm. I also had a p1211 code last week. The truck acts fine except like sitting at a red light, there just seems to be more shake than normal. What about a sticking IPR valve and I have read where those can be removed, cleaned and re-installed??
Dan
Posting Guru
Joined: Apr 2009
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From: Northern Idaho
According to my DTC Library P1211 does not exist or is not documented.
I wonder if you have a slipping torque converter or one that is grabbing when it shouldn't. Can you scan your rig now and run a KOER test?
I wonder if you have a slipping torque converter or one that is grabbing when it shouldn't. Can you scan your rig now and run a KOER test?
Post Fiend
Joined: Jun 2004
Posts: 9,293
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From: Parker, CO
P1211 is ICP High/Low. It's extremely common to set this code with a chip, or in your case a reflashed PCM with an 80hp tune. It just means the HPOP isn't keeping up with the oil demanded to the injectors, so the ICP pressure is lower than what is being called for. Ignore it for now, that's not what's causing the shaking problem.
If it's only shaking while in gear or in reverse, and doesn't do it in neutral or park, then it's a torque converter or flywheel problem. A bad ICP sensor would also idle rough in park or neutral.
If it's only shaking while in gear or in reverse, and doesn't do it in neutral or park, then it's a torque converter or flywheel problem. A bad ICP sensor would also idle rough in park or neutral.
