Hot start issues again....
Certified Thread Hijacker
Joined: Aug 2001
Posts: 14,441
Likes: 59
I would pull the IPR and check the screen.
Then air test thru the ICP to see if the HPOP or branch tube is the culprit.
Josh
Then air test thru the ICP to see if the HPOP or branch tube is the culprit.
Josh
Thread Starter
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Tuned
Joined: Jan 2006
Posts: 293
Likes: 1
I had some time today to dig deeper into this problem. I put the truck back to stock and took it for a test run with the AE hooked up. I now am really puzzled. ICP actual pressure will now hit 3900 psi with IPR at about 85% at WOT. It will now start hot although it still has extended crank time. Could a sticky IPR cause this?
Lead Driver
Joined: Oct 2010
Posts: 5,420
Likes: 16
From: Ouray, CO
The "trouble" with a lot of tuners is they play games with the sensor values to fool the PCM into creating more power. So, without knowing the details of how that specific tuner achieves it's power a number of sensor values likely were effected with the tune.
An easy illustration would be for the tune to reduce the actual BST by 20% so the PCM unknowingly lets the BST go higher than it would normally allow it. So the PCM and dash gauge may show 25 PSI, but there might actually be 30 PSI..
An easy illustration would be for the tune to reduce the actual BST by 20% so the PCM unknowingly lets the BST go higher than it would normally allow it. So the PCM and dash gauge may show 25 PSI, but there might actually be 30 PSI..
Certified Thread Hijacker
Joined: Aug 2001
Posts: 14,441
Likes: 59
The "trouble" with a lot of tuners is they play games with the sensor values to fool the PCM into creating more power. So, without knowing the details of how that specific tuner achieves it's power a number of sensor values likely were effected with the tune.
An easy illustration would be for the tune to reduce the actual BST by 20% so the PCM unknowingly lets the BST go higher than it would normally allow it. So the PCM and dash gauge may show 25 PSI, but there might actually be 30 PSI..
An easy illustration would be for the tune to reduce the actual BST by 20% so the PCM unknowingly lets the BST go higher than it would normally allow it. So the PCM and dash gauge may show 25 PSI, but there might actually be 30 PSI..
Josh
Senior User
Joined: Mar 2012
Posts: 107
Likes: 0
Edge tuners suck, they fool the computer. Get a SCT with custom tunes and never look back. They reprogram the computer and save the stock tune for later.
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Thread Starter
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Tuned
Joined: Jan 2006
Posts: 293
Likes: 1
That is exactly what the Edge Evolution does. I've had this tuner for close to 50000 miles with no issues at all. Furthermore replacing my tuner with a SCT is not going to correct the hot start issue I described in the original post.
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Tuned
Joined: Jan 2006
Posts: 293
Likes: 1
I found the problem. Oil rail to injector o-ring on #7 injector was pooched. There is a pic here comparing it to a new one.
Ford Truck Enthusiasts Forums - ramsay's Album: 6.0 - Picture
Ford Truck Enthusiasts Forums - ramsay's Album: 6.0 - Picture
Posting Guru
Joined: Jun 2006
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I hooked him up!
Logistics Pro
Joined: Dec 2004
Posts: 4,138
Likes: 7
From: South Weber, Utah
I found the problem. Oil rail to injector o-ring on #7 injector was pooched. There is a pic here comparing it to a new one.
Ford Truck Enthusiasts Forums - ramsay's Album: 6.0 - Picture
Ford Truck Enthusiasts Forums - ramsay's Album: 6.0 - Picture
Thread Starter
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Tuned
Joined: Jan 2006
Posts: 293
Likes: 1
You need to look at a post by creator that addresses the cause of the oring failure you just had as it is likely to happen again, https://www.ford-trucks.com/forums/1...ole-story.html And thank you for the update.