Stumbling Six
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Mountain Pass
Joined: Nov 2015
Posts: 121
Likes: 5
Changed the TPS plug. Still a little hard to start but it is idling a bit better now. Seems like the more of the wiring harness i clean up the better it is at idle. transmission rear seal was looked at by my local shop and i was told i can do it with it in the truck and the rear main seal will be attempted this weekend sometime. Thanks for the help and if i figure anything else out for the idle i will post it here.
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Mountain Pass
Joined: Nov 2015
Posts: 121
Likes: 5
This is the code reader most on here use. This is from Amazon but available elsewhere. Your issue could be a bad throttle position sensor TPS. https://www.youtube.com/watch?v=_skVHdgtMTU. Also you could check your fuel pressure with a loan gauge free from auto parts stores.
https://www.amazon.com/INNOVA-3145-F...s%2C197&sr=8-5
https://www.amazon.com/INNOVA-3145-F...s%2C197&sr=8-5
Lead Driver
Joined: Jan 2019
Posts: 5,081
Likes: 865
From: N.W. Alabama
Pressure is too low, needs to be 50+, but more like 55-60, on 4.9L, make sure you check the 'Operating Pressure' before buying, example-Standard Ignition - PR18, is 47psi, and not enough.
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Mountain Pass
Joined: Nov 2015
Posts: 121
Likes: 5
Found a bad fuel pressure regulator and replaced. No it won't start and i got the code reader to power on. Code 34, egr valve, and 67, ac switch. Egr delete is on the way and going to drop the tank this evening because the fuel filter was pouring out brown fuel from the tank side. Going to check all the fuel system parts now. Anyone know the proper resistance that the sending units are supposed to read? I am going to try to fix the gauge problem while i have the tanks dropped.
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
From a subford post.....Service Code 67 indicates that during Self-Test, voltage was high on NDS (Pin 30) or ACCS (Pin 10) circuit.
NOTE: Verify A/C selector is off (and shift selector is in PARK for E40D vehicles).
Your EGR code could have been from the truck not being at operating temp when you ran the test.
Also your clutch needs to be depressed when testing if you didn't do that. Only applicable to the 4.9 and manual shift.
NOTE: Verify A/C selector is off (and shift selector is in PARK for E40D vehicles).
Your EGR code could have been from the truck not being at operating temp when you ran the test.
Also your clutch needs to be depressed when testing if you didn't do that. Only applicable to the 4.9 and manual shift.
Thread Starter
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Mountain Pass
Joined: Nov 2015
Posts: 121
Likes: 5
From a subford post.....Service Code 67 indicates that during Self-Test, voltage was high on NDS (Pin 30) or ACCS (Pin 10) circuit.
NOTE: Verify A/C selector is off (and shift selector is in PARK for E40D vehicles).
Your EGR code could have been from the truck not being at operating temp when you ran the test.
Also your clutch needs to be depressed when testing if you didn't do that. Only applicable to the 4.9 and manual shift.
NOTE: Verify A/C selector is off (and shift selector is in PARK for E40D vehicles).
Your EGR code could have been from the truck not being at operating temp when you ran the test.
Also your clutch needs to be depressed when testing if you didn't do that. Only applicable to the 4.9 and manual shift.
Lead Driver
Joined: Jan 2019
Posts: 5,081
Likes: 865
From: N.W. Alabama
check that they didnt give you wrong FPR, or you will still have the stumble off idle, because pressure is too low
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
Found a bad fuel pressure regulator and replaced. No it won't start and i got the code reader to power on. Code 34, egr valve, and 67, ac switch. Egr delete is on the way and going to drop the tank this evening because the fuel filter was pouring out brown fuel from the tank side. Going to check all the fuel system parts now. Anyone know the proper resistance that the sending units are supposed to read? I am going to try to fix the gauge problem while i have the tanks dropped.
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Mountain Pass
Joined: Nov 2015
Posts: 121
Likes: 5
Fuel filter allowed the fuel pressure to get up to 50. The only tank selector valve the parts store gad was the late model version with an electrical plug. Mine has the earlier version and i don't know if it will work or not. Still won't start. Every time i find a confirmed bad part, fuel pressure regulator pushing fuel out of the vacuum line, and fix it it makes more problems. I am getting to the point of frustration with this motor.
Lead Driver
Joined: Jan 2019
Posts: 5,081
Likes: 865
From: N.W. Alabama
Thread Starter
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Mountain Pass
Joined: Nov 2015
Posts: 121
Likes: 5
