Arisley
Moderator
Tuning. Try a different chip.
Sent from my truck while eating, adjusting the radio and passing a Mustang sideways.
Sent from my truck while eating, adjusting the radio and passing a Mustang sideways.
Major 7.3 Headscratcher
- Thread starter Marty
- Start date
lincolnlocker
Well-known member
whs^^^ or put it back to stock tuning and see what it does...
live life full throttle
live life full throttle
dsberman94
Well-known member
He already did that when he changed the PCM. Said above PCM had stock tune when swapped.
lincolnlocker
Well-known member
ghohouston
Active member
But was it another stock pcm swapped in, or did he write some "stock" tune onto said pcm? Sorry if i missed it
Powerstroke Man 6.4
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If all else fails and it smooths out with the ICP sensor unplugged and it defaults to the 7xx and idle smooth could you possibly put a chip in or pcm flash and tell a tuner to bump up ICP to the point where it smooths out at idle ie 7xx to fix the problem?
Marty
New member
Another stock PCM.
Not really the direction I am going with this. Something is wrong, and apparently has caused the truck to shut off on the customer. It needs to be figured out.
Bustedknuckles
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What's the EBP sensor showing?
boggerr
New member
Easy fix, change cap and rotor.
Check oil pressure at the hpop resevoir.
Check oil pressure at the hpop resevoir.
Arisley
Moderator
Easy fix, change cap and rotor.
Check oil pressure at the hpop resevoir.
Colder spark plugs.
^^^ we may not be on same page, but EBP was something that I was thinking about as well.. The power supply for the MAP, EBP, and ICP is all on the same line. Any shorts, chafing, etc? It does not explain the sudden dying.
Can the cam gear pickups for the CPS die?
Arisley
Moderator
Marty, have you checked the little fittings between the fuel lines and the heads. They may be clogged enough to have bad flow at idle, but once off idle, they flow fine.
Just a WAG.
Just a WAG.
Bustedknuckles
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His icp is fluctuating, don't see how the fuel side would affect that. Someone earlier posted about checking LPO which is a great idea!
Arisley
Moderator
Forgot about that.
Scope the CPS sensor and see if it follows the rpm drop. I have seen once where a trucks cam shaft would walk causing a weird idle issue.
Also are you taking reading thru the computer or with anctually scope. I have seen reading thru PCM be off before.
I usally use my 4 channel modis for this so I can monitor a few channels at once.
Mike
Also are you taking reading thru the computer or with anctually scope. I have seen reading thru PCM be off before.
I usally use my 4 channel modis for this so I can monitor a few channels at once.
Mike
lincolnlocker
Well-known member
Marty
New member
Ebps reading 17 @ idle. Absolute reading. Does this with tune and without tune.
Lpo is fine, so is icp off idle or with sensor unplugged.
I inspected icp sensor face and checked resistance, no marking and was the same from one 7.3 to another. This is a stock 7.3 and the cam gear hasn't been off. I doubt it has cam gear walk for that reason too.
Lpo is fine, so is icp off idle or with sensor unplugged.
I inspected icp sensor face and checked resistance, no marking and was the same from one 7.3 to another. This is a stock 7.3 and the cam gear hasn't been off. I doubt it has cam gear walk for that reason too.
Marty
New member
I inspected cps*** face. I'm on my phone. It won't let me multi quote or edit.
