'97 PSD surging during warmup
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Junior User
Joined: Oct 2004
Posts: 63
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From: Slana, Alaska
'97 PSD surging during warmup
Hello FTE folks,
Does anyone have any thoughts as to why my '97 PSD surges or lugs down during warmup. This is especially obvious on cold mornings.
Thanks for your help
Does anyone have any thoughts as to why my '97 PSD surges or lugs down during warmup. This is especially obvious on cold mornings.
Thanks for your help
Postmaster
Joined: Feb 2002
Posts: 2,773
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From: Bonney Lake, WA
Is this happening when the truck is first started and idling, or when you're underway?
If it's when you're idling, it could be caused by one or more glow plugs not operating properly, so the current "pulsates" as a result.
If it's when you're idling, it could be caused by one or more glow plugs not operating properly, so the current "pulsates" as a result.
New User
Joined: Mar 2004
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You may want to have your glow plug relay checked I go through at least one a year. I was told that there are two relays each with four opposing cyclnders so if one relay goes the other will heat four opposite cylinders. Of course I've had for glow replaced at once also. The extreme cold is not to friendly to our PSD's. I was in Tok a couple weeks ago during the -60 F cold snap, I'd leave the truck plugged in all night then throw a 50,000 btu master heater under for a half hour to warm belts and seal so that stuff wouldn't shatter when started. My buddies just let them run all night the 6.0l burns just under a 1/4 tank in a night.
Senior User
Joined: Aug 2004
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From: Las Vegas, Nevada
Originally Posted by psdinalaska
Hello FTE folks,
Does anyone have any thoughts as to why my '97 PSD surges or lugs down during warmup. This is especially obvious on cold mornings.
Thanks for your help
Does anyone have any thoughts as to why my '97 PSD surges or lugs down during warmup. This is especially obvious on cold mornings.
Thanks for your help
Senior User
Joined: Jul 2004
Posts: 318
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My 97 starts and idles ok (although it's obvious it does not like the cold). but when I drive away it makes quite a noise. Not sure how to describe it. Simular to large truck using exhaust brake but nowhere near that loud. My guess is something past the turbo is restricting air flow until it warms up. after it's warm it sounds and runs fine. I'm getting ready to haul a trailer, and temps look like they'll be in the 20's. Should I be looking for something or is all working right??
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Postmaster
Joined: Feb 2002
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From: Bonney Lake, WA
What you're hearing is the Exhaust Backpressure Valve, or EBPV. It consists of a butterfly valve in the housing immediately downstream from your turbo. When it's cold enough, the pcm sends a signal to the actuator, which closes the valve. Once the engine warms up sufficiently, the valve stays open.
The idea is to allow the engine to warm up faster, but many have found that it doesn't help enough to notice, and that the only true accomplishment of the device is to make an annoying sound, and require extra throttle pedal to overcome it.
I've gutted my EBPV, and haven't seen any increase in warmup time, EGT's are slightly lower, and boost is slightly higher as a result.
If you want to disable it, disconnect the two-wire harness at the base of the turbo. Gutting it is a little more involved, but instructions are readily available.
The idea is to allow the engine to warm up faster, but many have found that it doesn't help enough to notice, and that the only true accomplishment of the device is to make an annoying sound, and require extra throttle pedal to overcome it.
I've gutted my EBPV, and haven't seen any increase in warmup time, EGT's are slightly lower, and boost is slightly higher as a result.
If you want to disable it, disconnect the two-wire harness at the base of the turbo. Gutting it is a little more involved, but instructions are readily available.
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Thread Starter
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Junior User
Joined: Oct 2004
Posts: 63
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From: Slana, Alaska
I'll bet that the EBPV is what is causing it. If I unplug it will it fail to the open position?
Thanks for your suggestions, I think that I will invest in a extra glow plug relay and have it under the back seat. I've never had a problem yet, but it sounds like it's just a matter of time. I only live about 65 miles from Tok and parts stores in that country are not very handy.
Thanks for your suggestions, I think that I will invest in a extra glow plug relay and have it under the back seat. I've never had a problem yet, but it sounds like it's just a matter of time. I only live about 65 miles from Tok and parts stores in that country are not very handy.
