low idle at startup
when I start up my 12 valve, it has a very low idle, but when it warms up the idle gradually increases, I've adjusted the idle, and it does the same thing if I have it set at 700rpm it will warm up and be around 800-900RPM. the lift pump is new, injection pump was rebuilt not long ago, and I've got 75hp ddp injectors.
an Ideas, or is this normal |
mine does that too, 400 rpm at cold start 600 warm. then back down to 400 if its over 110F I always figured it was the thick oil and less effecent of a cumbustion burn+ mechanical throttle without any electronic idle control
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Back off the gov. springs a click, then readjust the idle.
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Mine is the same way, regardless of "cold" starting temp, will be about 200 rpms less then warm engine idle. A few seconds with foot on the throttle gets it closer pretty quick.
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same thing cold its about 400-500 and warm 600-750. Just is Cold, is normal ive come to realize.
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Seems most mechanically injected diesels do this...nature of the beast. No computer to compensate for a cold engine and cold start to advance more fuel.
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My P pumped Cummins has always done this. Figure it is normal. I also have to apply a touch of throttle to get an immediate start, otherwise it turns over a couple of times like an older gas engine. The VE pumped Cummins had neither of these issues.
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Originally Posted by eng208
(Post 3148302)
I also have to apply a touch of throttle to get an immediate start, otherwise it turns over a couple of times like an older gas engine. The VE pumped Cummins had neither of these issues.
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My truck does the same when cold...I thought that was normal...I have a manual high idle cable for warm up ...
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Originally Posted by eng208
(Post 3148302)
My P pumped Cummins has always done this. Figure it is normal. I also have to apply a touch of throttle to get an immediate start, otherwise it turns over a couple of times like an older gas engine. The VE pumped Cummins had neither of these issues.
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Originally Posted by Diesel Dave2
(Post 3148323)
My truck does the same when cold...I thought that was normal...I have a manual high idle cable for warm up ...
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Originally Posted by Tate
(Post 3142061)
Back off the gov. springs a click, then readjust the idle.
Originally Posted by Tate
(Post 3148385)
Or adjust the governor springs and idle and it fires up immediately. Seems like a simple solution.
I've been down this road already, argued about it in another thread somewhere. Tate has the answer, and it is simple. |
Originally Posted by Tate
(Post 3148385)
Or adjust the governor springs and idle and it fires up immediately. Seems like a simple solution.
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Tate hasn't been on since Dec 2014, according to his user info - and this thread died in 2012. Do you need a resource for adjusting the idle, or the governor springs? Do a google search for "p7100 pump adjust governor springs", or use the search facility on here to search this forum. This should come up in your search results...
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Originally Posted by texasprd
(Post 3383204)
Tate hasn't been on since Dec 2014, according to his user info - and this thread died in 2012. Do you need a resource for adjusting the idle, or the governor springs? Do a google search for "p7100 pump adjust governor springs", or use the search facility on here to search this forum. This should come up in your search results...
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