Gjac
Milford, CT
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Joined: 08/16/2006
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RVKamper wrote:You are all great, thank you for the input. To expand on the second paragraph as someone suggested, it is when I rev the motor in neutral that it settles. And other than the rattle that settles, it seems “normal”. As far as the behavior when driving, it slowly, gradually loses power until I’m creeping along in the shoulder, then the tow truck. My thinking tells me if it was a catastrophic failure in the engine, as was my first thought, then it wouldn’t run at all. My home made other demands on my time this weekend (can you say garbage disposal?), so I have not gotten under the rig yet. If I understand your post correctly, it starts fine runs fine for a while then gradually loses power until the engine dies? How long does it run fine for at hiway speeds? Hours or just until engine comes up to temperature? When was the last time the in tank fuel pump was replaced? How many miles ago?
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opnspaces
San Diego Ca
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It sounds like a plugged cat to me. With a willing helper start the truck and in neutral rev the engine a few times. Have the helper stand in the back stick their open palm by the exhaust and feel the strength of the exhaust coming out while you rev it. Then go for a drive and when it slows down pull into a parking lot and have them feel the exhaust again.
When it loses power will it still rev in neutral?
Does power level temporarily go back to normal after it gets towed home?
Pull the cat and see if it's plugged or rattles. If it;s welded on then maybe talk to a local muffler shop guy have them cut the cat out and see if it's plugged. If not plugged they can weld it right back in.
2001 Suburban 4x4. 6.0L, 4.10 3/4 ton
2005 Jayco Jay Flight 27BH
1986 Coleman Columbia Popup.
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klutchdust
Orange, California
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Joined: 06/09/2004
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Have experienced fuel lines that collapsed and restricted fuel flow. They would rest and open up again then suction would collapse them. again.
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Grit dog
Black Diamond, WA
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klutchdust wrote:Have experienced fuel lines that collapsed and restricted fuel flow. They would rest and open up again then suction would collapse them. again.
Kinda doesn't explain the bang clatter, whatever noise. Although fuel system could be an issue.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
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Grit dog
Black Diamond, WA
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opnspaces wrote:It sounds like a plugged cat to me. With a willing helper start the truck and in neutral rev the engine a few times. Have the helper stand in the back stick their open palm by the exhaust and feel the strength of the exhaust coming out while you rev it. Then go for a drive and when it slows down pull into a parking lot and have them feel the exhaust again.
When it loses power will it still rev in neutral?
Does power level temporarily go back to normal after it gets towed home?
Pull the cat and see if it's plugged or rattles. If it;s welded on then maybe talk to a local muffler shop guy have them cut the cat out and see if it's plugged. If not plugged they can weld it right back in.
I'm believing this is the most likely issue and where I'd start as well.
If you can even reasonably verify you think there is a restriction, (if there's not, it'll only cost you a $20 band clamp to repair the self inflicted damage I'm about to suggest) I'd cut the exhaust pipe off just ahead of the cat, in a spot you can clamp it back together, move the cat aside a bit, tie it up or whatever and take a run with it.
Hope you go the garbage disposal fixed! Its always something aint it??
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Chum lee
Albuquerque, NM
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opnspaces wrote:It sounds like a plugged cat to me. With a willing helper start the truck and in neutral rev the engine a few times. Have the helper stand in the back stick their open palm by the exhaust and feel the strength of the exhaust coming out while you rev it. Then go for a drive and when it slows down pull into a parking lot and have them feel the exhaust again.
When it loses power will it still rev in neutral?
Does power level temporarily go back to normal after it gets towed home?
Pull the cat and see if it's plugged or rattles. If it's welded on then maybe talk to a local muffler shop guy have them cut the cat out and see if it's plugged. If not plugged they can weld it right back in.
I agree with the above.
Chum lee
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Krusty
Calgary, Alberta,Canada
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I would investigate the catalytic converter further. It sounds similar to an issue I had with my truck. It ran fine with good power most of the time, and intermittently the power would drop right down. It turns out that one of the catalyst "pucks" in the converter had broken in half, and the halves would rattle around in there until one of them became lodged sideways in the outlet of the converter, causing a severe restriction. It would break itself free after a bit, and power would be restored. Not sure you would be able to locate this blockage with a pressure test as it is intermittent. I cut my converter in half and knocked the guts out and welded it back up. Been fine since.
Krusty
92 F-250 4x4 460 5spd 4.10LS Prodigy
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RVKamper
CA
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Thank you Ernie, and thanks all. I’ve got some things to check. I’ll che k back in and let you know how it goes.
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heyobie
Maryland
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It could also be a fuel issue. You can drive it but can't get up to speed.
i have a 1988 FI 450.Mine has 2 fuel pumps. One in the fuel tank. Low pressure. Then one on the frame. High pressure.
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30sweeds
Iowa
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My old 88 had the exact same situation and noise. (88 was actually 1st year for F.I.) It was the cat.One sign to look for is evidence of heat on exhaust before the cat...like a blue tint.
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