460 Surging, Missing, Bucking.
Postmaster
Joined: Oct 2008
Posts: 3,026
Likes: 0
From: Renton, WA
To continue from my first post.
The truck cuts out anytime it is under load like on a flat or moving up any hill. This mostly occurs at 1900 to 2300 RPM.
I replaced the small frame rail filter about a month ago. No help.
I plugged the vacuum line for the fuel regulator. No change.
I just today, changed plugs, wires, cap and rotor with NAPA/Belden, Eclin parts. No change. The Motorcraft double platinum plugs I replaced looked fantastic, but maybe a little lean.
I guess I now move to vacuum, but need a gauge first.
The truck cuts out anytime it is under load like on a flat or moving up any hill. This mostly occurs at 1900 to 2300 RPM.
I replaced the small frame rail filter about a month ago. No help.
I plugged the vacuum line for the fuel regulator. No change.
I just today, changed plugs, wires, cap and rotor with NAPA/Belden, Eclin parts. No change. The Motorcraft double platinum plugs I replaced looked fantastic, but maybe a little lean.
I guess I now move to vacuum, but need a gauge first.
Cross-Country
Joined: Jul 2004
Posts: 52
Likes: 0
Cutting out at 2000 RPM or more.
Fuel pressure regulator.
Yes, I unplugged the fuel pressure regulator from the manifold vacuum source and plugged this source with a vacuum cap. Then I drove the truck. It still had the miss.
I've also learned that the transmission shifts properly and probably not the problem.
Currently checking vacuum, fuel pressure and looking to see if all of the sensors are getting their 5 volt reference voltage from the ECU.
It also seems that it will miss under any heavy load, even at 1500 RPM.
I'll eventually get there.
Yes, I unplugged the fuel pressure regulator from the manifold vacuum source and plugged this source with a vacuum cap. Then I drove the truck. It still had the miss.
I've also learned that the transmission shifts properly and probably not the problem.
Currently checking vacuum, fuel pressure and looking to see if all of the sensors are getting their 5 volt reference voltage from the ECU.
It also seems that it will miss under any heavy load, even at 1500 RPM.
I'll eventually get there.
Postmaster
Joined: Oct 2008
Posts: 3,026
Likes: 0
From: Renton, WA
Fuel pressure regulator.
Yes, I unplugged the fuel pressure regulator from the manifold vacuum source and plugged this source with a vacuum cap. Then I drove the truck. It still had the miss.
I've also learned that the transmission shifts properly and probably not the problem.
Currently checking vacuum, fuel pressure and looking to see if all of the sensors are getting their 5 volt reference voltage from the ECU.
It also seems that it will miss under any heavy load, even at 1500 RPM.
I'll eventually get there.
Yes, I unplugged the fuel pressure regulator from the manifold vacuum source and plugged this source with a vacuum cap. Then I drove the truck. It still had the miss.
I've also learned that the transmission shifts properly and probably not the problem.
Currently checking vacuum, fuel pressure and looking to see if all of the sensors are getting their 5 volt reference voltage from the ECU.
It also seems that it will miss under any heavy load, even at 1500 RPM.
I'll eventually get there.
Cross-Country
Joined: Jul 2004
Posts: 52
Likes: 0
Cutting out at 2000 RPM or more.
Looks like it's fuel related.
45 lbs at a fast idle and stays that way until there is a load. Then it drops to less than 20 lbs.
Brand new fuel pump is really noisy. I'm also going to replace the inline fuel filter and check the filter in the large black canister.
May have to replace the new fuel pump.
Here's hoping I don't need to drop both tanks and replace the socks......
Must have bought BAD fuel somewhere.
45 lbs at a fast idle and stays that way until there is a load. Then it drops to less than 20 lbs.
Brand new fuel pump is really noisy. I'm also going to replace the inline fuel filter and check the filter in the large black canister.
May have to replace the new fuel pump.
Here's hoping I don't need to drop both tanks and replace the socks......
Must have bought BAD fuel somewhere.
Postmaster
Joined: Oct 2008
Posts: 3,026
Likes: 0
From: Renton, WA
Looks like it's fuel related.
45 lbs at a fast idle and stays that way until there is a load. Then it drops to less than 20 lbs.
Brand new fuel pump is really noisy. I'm also going to replace the inline fuel filter and check the filter in the large black canister.
May have to replace the new fuel pump.
Here's hoping I don't need to drop both tanks and replace the socks......
Must have bought BAD fuel somewhere.
45 lbs at a fast idle and stays that way until there is a load. Then it drops to less than 20 lbs.
Brand new fuel pump is really noisy. I'm also going to replace the inline fuel filter and check the filter in the large black canister.
May have to replace the new fuel pump.
Here's hoping I don't need to drop both tanks and replace the socks......
Must have bought BAD fuel somewhere.
Cross-Country
Joined: Jul 2004
Posts: 52
Likes: 0
Cutting out at 2000 RPM or more.
Nailed it. Brand new fuel pump had gone bad after two days. Cost me an additional $350.00.
to continue:
The vacuum was fine and nothing suggested an issue in this area.
The fuel pressure with the fuel pressure regulator disconnected was 45 lbs at idle and quite unstable at that. It fluctuated between 45 lbs at idle and 20 lbs under load.
Replaced the fuel filter downstream from the high pressure pump and cut it open. It was a month old and clean.
Replaced the fuel filter in the black canister prior to the high pressure pump. It had been in place for about four years. Cut it open and found some dirt but not nearly enough to keep fuel from flowing.
That left the new high pressure noisy pump. I could not believe that a new pump would go bad that quickly, but that was it. NAPA replaced it no problem. I think it was a Carter and made in the USA.
Kind of made me mad since I'd nailed the issue from the get go. I guess that is life.
Fixed it and I hope it helps the rest of you. Read the codes and then check the fuel pressure and vacuum readings.
to continue:
The vacuum was fine and nothing suggested an issue in this area.
The fuel pressure with the fuel pressure regulator disconnected was 45 lbs at idle and quite unstable at that. It fluctuated between 45 lbs at idle and 20 lbs under load.
Replaced the fuel filter downstream from the high pressure pump and cut it open. It was a month old and clean.
Replaced the fuel filter in the black canister prior to the high pressure pump. It had been in place for about four years. Cut it open and found some dirt but not nearly enough to keep fuel from flowing.
That left the new high pressure noisy pump. I could not believe that a new pump would go bad that quickly, but that was it. NAPA replaced it no problem. I think it was a Carter and made in the USA.
Kind of made me mad since I'd nailed the issue from the get go. I guess that is life.
Fixed it and I hope it helps the rest of you. Read the codes and then check the fuel pressure and vacuum readings.
Thread Starter
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Senior User
Joined: Oct 2002
Posts: 187
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Yeah, CLASSIC example of a highjacked thread.
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Postmaster
Joined: Oct 2008
Posts: 3,026
Likes: 0
From: Renton, WA
What are you so grumpy about? You didn't give any info to work with, lorenr did. I asked several questions in an attempt to help you, and got no answers, what do you expect?
Cross-Country
Joined: May 2007
Posts: 86
Likes: 0
I've got an '88 SuperDuty with the 460 and it runs well until about 2400-2500 RPM and then loses power, and will miss or buck until about 3000 RPM and then it will take off like a switch was thrown. Any ideas?? I've checked the plugs, timing and put a new fuel regulator in. Same thing.
Thanks.
Thanks.
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