Warm start/low speed issues
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Laughing Gas
Joined: Mar 2006
Posts: 1,164
Likes: 2
From: Tri-Cities, TN
Warm start/low speed issues
Trucks starts great when cold, high idle kicks down at the proper temp, good glow plugs. But after it has warmed up and I try to restart, it coughs, sputters, and is generally a cranky beast. Smoky and won't clean up until it has run for a couple of minutes with some revs, at idle it is just fogging the neighborhood with grey smoke and running rough. Definitely diesel smoke, so I know it's over-fueling at idle/low speed. My question is whether this is a timing issue, or injectors, or injection pump. Or a combo platter of all three!? Ideas from my fellow IDI junkies?
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
Sounds like the IP is heading south ... Next time it's hot/warm and won't start take some non cold (ie cool but not cold) water and cool the IP, if it starts the IP is on it's way out ...
A spray bottle works well ...
-Enjoy
fh : )_~
A spray bottle works well ...
-Enjoy
fh : )_~
Junior User
Joined: Jan 2016
Posts: 61
Likes: 0
From: West TX
Sounds like it could be injection pump failure. I have one on the way out myself. Anybody know, Is it absolutely essential to replace the injectors with the pump? I have an old work truck and the pump is showing signs of heat soak failure. Was planning to just have it rebuilt and drop it in there with the original injectors and parts. I understand it's best to have all new parts, but for something that only is used occasionally for Lowe's runs is it necessary? What's the worst that can happen with old injectors and a new pump?
Last edited by Impreza_gc8; Jul 28, 2016 at 04:49 PM. Reason: forgot one word
Thread Starter
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Laughing Gas
Joined: Mar 2006
Posts: 1,164
Likes: 2
From: Tri-Cities, TN
I have an email in to R&D to see what Justin thinks I need for pump/injectors to match the turbo from last year. We'll be loading up our trailer for a cross-country move in September, so everything needs to be working properly. I imagine it is running on the OE pump/injectors and has 180+k on it, so it is likely time.
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
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i ain't rite
Joined: Mar 2005
Posts: 65,450
Likes: 5,520
From: Marlboro Mental Hospital.
Sounds like it could be injection pump failure. I have one on the way out myself. Anybody know, Is it absolutely essential to replace the injectors with the pump? I have an old work truck and the pump is showing signs of heat soak failure. Was planning to just have it rebuilt and drop it in there with the original injectors and parts. I understand it's best to have all new parts, but for something that only is used occasionally for Lowe's runs is it necessary? What's the worst that can happen with old injectors and a new pump?
i tried it a few times years ago because i could get 145-150k out of a pump, and 175k out of injectors.
the only reason i would put the pump in without injectors is because i needed the truck rite away and did not have the time to lay it up to put the injectors in with the pump. then would forget to put them in until one would die.
since the idi truck does not go out every day now, it can be laid up for the few days it takes me to do pump and injectors.
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Joe Kucinski
Mountain Pass
Joined: Oct 2000
Posts: 180
Likes: 0
From: Backwoods Massachusetts
My mechanic buddy looked at me like I had three heads when I wanted him to change the injectors at the same time as the pump. "In 30 years of doing this I've never had to change an old mechanical diesel injector - they just don't fail"
I can easily appreciate the benefit of fresh injectors with known pop-off pressures. My old ones were working but you could hear several made different sounds. I was glad I was able to talk him into it.
BTW when my injector pump went (unknown mileage on a Jasper reman that appears to have been in there a while), it did not respond to the cool water treatment. It would idle or run up a little but with any more than about 10-20 seconds of load it would just fold up its' cards. Of course I discovered it while doing a "stress test" 75mi from home with 3600lbs in it...
At any rate I am glad to have known components all around, with the GPs I've basically done a 100k refresh - or so I hope!
Cheers,
- Jeff
I can easily appreciate the benefit of fresh injectors with known pop-off pressures. My old ones were working but you could hear several made different sounds. I was glad I was able to talk him into it.
BTW when my injector pump went (unknown mileage on a Jasper reman that appears to have been in there a while), it did not respond to the cool water treatment. It would idle or run up a little but with any more than about 10-20 seconds of load it would just fold up its' cards. Of course I discovered it while doing a "stress test" 75mi from home with 3600lbs in it...
At any rate I am glad to have known components all around, with the GPs I've basically done a 100k refresh - or so I hope!
Cheers,
- Jeff
i ain't rite
Joined: Mar 2005
Posts: 65,450
Likes: 5,520
From: Marlboro Mental Hospital.
that "mechanic" does not know what he is talking about. life expectancy of injectors is around 150k miles, if you really push them you can maybe get 200k out of them, but they are shot by them. the nozzles start to fail and will drip instead of spray.
or they will just plug up and stop working all together.
i have one in my truck rite now that will shut off if it idles for more than about 15 minutes, and will not come back on unless you run it hard at the governor for 2 minutes.
once the cab comes off it is going to get the new pump and injectors sitting on the shelf in the shop installed with all the new gaskets sitting next to them .
or they will just plug up and stop working all together.
i have one in my truck rite now that will shut off if it idles for more than about 15 minutes, and will not come back on unless you run it hard at the governor for 2 minutes.
once the cab comes off it is going to get the new pump and injectors sitting on the shelf in the shop installed with all the new gaskets sitting next to them .
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
I just a half hour ago did a roadside rescue in the same sort of situation. He stopped at the recycling bins, and the truck wouldn't restart. I dumped a quart of water on it, fired it up, and told him to go to idiperformance.com for a new pump.
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Laughing Gas
Joined: Mar 2006
Posts: 1,164
Likes: 2
From: Tri-Cities, TN
Since I haven't received any word back from Justin, I will ask my fellow IDI junkies: what pump/injector combo for a rebuilt factory turbo with a 3" elbow, full 3" DP, 4" exhaust? To be used for pulling a big trailer at moderate speeds. When the turbo was rebuilt, Justin suggested the stock wheel as I was looking for low RPM boost and don't care about the power over 2400 as that is not where I drive. So should I go 80/90/110? I would think that a 90 would be more than sufficient? And stock or stage 1 injectors?
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