Cold Start Problem
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
A loose UVCH will usually throw a P1316 and the CEL. Have you tried the buzz test when the engine is cold? Have you monitored ICP pressure and % while cranking? You might want to monitor ICP % (really IPR) to see what that does and how it changes when the engine warms up.
Sorry about the MAP question. I see you already mentioned that in an earlier post.
Sorry about the MAP question. I see you already mentioned that in an earlier post.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
The 2 things that come to mind off the top of my head are either a bad TPS or a sticking IPR or o-rings leaking on the IPR(hence checking the ICP % on the scanner)
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Freshman User
Joined: Sep 2008
Posts: 34
Likes: 0
also even when its up to operating temperature there is little power until you drive it awhile. low power from 0 to 30 mph.when turbo kicks in there is lots of power and is smooth.if you run it hard for a few minutes the low end power comes back to life. hope i discribed that so you can understand its easyer for me to speak it than to type it.
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Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
But pushing the pedal with no response either means the signal is not going out, or it's not being received at the other end of the wires. Maybe we should ask an electrician.
Hotshot
Joined: Jan 2008
Posts: 13,144
Likes: 11
From: Rochdale MA
I'm going to see if I can find any info on the where's and how's of the TPS
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Injector poppets will can perform poorly with cold engine oil (buzz test when cold), then start to sound better if you buzz test them a few more times. This is usually seen with high mileage injectors, or those that have had poor maintenance schedules on the oil changes. Injector o-rings usually cause some smoke. Do you have any smoke while this is going on? If so, what color?
Out of curiosity, if you remove the oil cap with the truck at idle, what kind of blowby do you see?
Out of curiosity, if you remove the oil cap with the truck at idle, what kind of blowby do you see?
Hotshot
Joined: Jan 2008
Posts: 13,144
Likes: 11
From: Rochdale MA
This is all I can find (quickly) on the TPS
Irregular Engine Idle Speed (Diesel)
Incorrect engine idle speed adjustment or idle validation switch.
REPLACE the accelerator pedal and sensor assembly.
Irregular Engine Idle Speed (Diesel)
Incorrect engine idle speed adjustment or idle validation switch.
REPLACE the accelerator pedal and sensor assembly.
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Freshman User
Joined: Sep 2008
Posts: 34
Likes: 0
a steady wisp out of the filler cap and puffs of whiteish blue smoke when you hit the pedal and the engine flutters a little then puffs and clears up.does not smoke at idol.only smokes when you hit the pedal the engine will stumble and flutter a bit then clear. 170000 miles
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