I have not seen or thought about that video in a long time.
High Idle
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Fleet Mechanic
Joined: Aug 2015
Posts: 1,828
Likes: 359
From: Candy Mountain
I took the breaker box out of the equation, and did continuity checks again, and everything still looked good. So, I plugged the main harness back in to the computer, and plug the tps back in and fired it up. CEL, and now a 126 MAP code. No other codes present. nightmares of the past return!
There has to be something going on in the harness... I am thinking of just replacing the whole main harness with a NOS part.
There has to be something going on in the harness... I am thinking of just replacing the whole main harness with a NOS part.
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Fleet Mechanic
Joined: Aug 2015
Posts: 1,828
Likes: 359
From: Candy Mountain
Alright, so the old harness is out.
Comparing the fuse boxes, I realized the original is missing a a relay and a fuse. Pulled out the owners manual, and it looks like a PO disabled the ABS and I never noticed since there was never any problems... so we will see how that works out when everything is back together. I am surprised the ABS light hasn't been on...
Comparing the fuse boxes, I realized the original is missing a a relay and a fuse. Pulled out the owners manual, and it looks like a PO disabled the ABS and I never noticed since there was never any problems... so we will see how that works out when everything is back together. I am surprised the ABS light hasn't been on...
Lead Driver
Joined: Jan 2019
Posts: 5,067
Likes: 863
From: N.W. Alabama
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Fleet Mechanic
Joined: Aug 2015
Posts: 1,828
Likes: 359
From: Candy Mountain
okay, so...
Harness installed, truck running. No CEL, no MAP issues, but high idle issue remains. I am thinking the throttle isn't returning to idle baseline mechanically or bad TPS. The lack of TPS codes/CEL makes me lean toward the mechanical, and the computer just doesn't think the throttle is closed. I am thinking of putting a BBK unit on the truck to see if that makes any difference. I have one on the shelf, i just hate the dang thing. The pedal is way too stiff because of heavier return springs.
A little further down the rabbit hole we go...
Harness installed, truck running. No CEL, no MAP issues, but high idle issue remains. I am thinking the throttle isn't returning to idle baseline mechanically or bad TPS. The lack of TPS codes/CEL makes me lean toward the mechanical, and the computer just doesn't think the throttle is closed. I am thinking of putting a BBK unit on the truck to see if that makes any difference. I have one on the shelf, i just hate the dang thing. The pedal is way too stiff because of heavier return springs.
A little further down the rabbit hole we go...
Logistics Pro
Joined: Dec 2003
Posts: 3,776
Likes: 862
From: Foothills of NC
Are you sure the TPS is installer correctly? It's possible to get the TPS tangs in front the throttle shaft tangs instead of behind.
I always rotate the top of the TPS slightly toward the rear of the throttle body when installing, then rotate forward until the screw holes line up.
I always rotate the top of the TPS slightly toward the rear of the throttle body when installing, then rotate forward until the screw holes line up.
Hotshot
Joined: Jun 2015
Posts: 12,784
Likes: 2,422
I don’t think that is the problem. I have one that was so stiff that the cruise control cable would pop off the throttle cable. Eventually the springs broke, I believe, because the shaft couldn’t move
freely in the bushings. I sent it back under warranty. BBK said they didn’t see anything wrong but must have either done something to it or sent me another one in exchange. I don’t recall if it looked like the same one or not. I also complained to them that the lower coolant nipple is angled wrong and is turned in the wrong direction compared to the original part. I put the it on but it wasn’t any better than before so I put an OEM one back on it’s still in the box on a shelf. Same as yours.
I removed the antilock bulb in my Bronco but I had also replaced the 8.8 with a 9” and removed the RABS HCU on the frame with an adjustable valve.
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Fleet Mechanic
Joined: Aug 2015
Posts: 1,828
Likes: 359
From: Candy Mountain
Are you sure the TPS is installer correctly? It's possible to get the TPS tangs in front the throttle shaft tangs instead of behind.
I always rotate the top of the TPS slightly toward the rear of the throttle body when installing, then rotate forward until the screw holes line up.
I always rotate the top of the TPS slightly toward the rear of the throttle body when installing, then rotate forward until the screw holes line up.
As I said earlier... I see it oriented differently sometimes... I have it with the pigtail pointing toward the driver side, but it doesn't seem it would make a difference if you turned it 180 degrees, except the pigtail would clear the ignition wires much better.
Thread Starter
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Fleet Mechanic
Joined: Aug 2015
Posts: 1,828
Likes: 359
From: Candy Mountain
I don’t think that is the problem. I have one that was so stiff that the cruise control cable would pop off the throttle cable. Eventually the springs broke, I believe, because the shaft couldn’t move
freely in the bushings. I sent it back under warranty. BBK said they didn’t see anything wrong but must have either done something to it or sent me another one in exchange. I don’t recall if it looked like the same one or not. I also complained to them that the lower coolant nipple is angled wrong and is turned in the wrong direction compared to the original part. I put the it on but it wasn’t any better than before so I put an OEM one back on it’s still in the box on a shelf. Same as yours.
I removed the antilock bulb in my Bronco but I had also replaced the 8.8 with a 9” and removed the RABS HCU on the frame with an adjustable valve.
