Injectors
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More Turbo
Joined: Sep 2016
Posts: 580
Likes: 4
From: Michigan
What would cause the truck to run at a higher idle for a couple minutes at startup? It's 44 degrees and it sits at about 1000 for a minute and a half two minutes then drops to normal idle. Is it just tripping the high idle because of the ambient temperature?
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,354
Likes: 5,946
From: Lake Hartwell, GA
There is a high idle built into the PCM programming if the conditions are right. It will warm the engine up to a specified value and then bring the idle back down.
Very similar to how some of us have a manual selected high idle, the truck will do this on its own if it sees fit.
Very similar to how some of us have a manual selected high idle, the truck will do this on its own if it sees fit.
Hotshot
Joined: Dec 2012
Posts: 11,278
Likes: 1,658
From: Las Cruces New Mexico
Yes, check armature clearance, should be a tight .004 to a loose .003 filler gauge. After that they have to be fully disassemble which IMO only a pro should do it.
Last edited by z31freakify; May 6, 2017 at 09:49 PM. Reason: Added more info
Fleet Mechanic
Joined: Jul 2003
Posts: 1,614
Likes: 22
From: Springfield, PA
The only quantitative test I know of is the CCT, but even that has qualifiers, such as stock fuel system & injector #8 and the CPS. Beyond that you need a good data logger and running some highway WOT tests and asking someone here on the forum - not me - too look over your data.
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Fleet Mechanic
Joined: Jul 2003
Posts: 1,614
Likes: 22
From: Springfield, PA
Someone with no shop experience can replace injectors in these things - that being most of us the first time we had to do it. It's just tedious, and a DIY'er can do them all in a day. Although I prefer one day to remove and clean, and the second to install when rested and no longer grumpy. There is a lot of PM stuff that can be done on the way in and while buttoning things up, which most shops won't do. And no special tools are needed, beyond something to clear the fuel/oil out of the cylinders. The hardest part may very well be reaching some of those valve cover bolts!
Any shop can do it, but if they shove them in quickly they can damage the very orings that will send you back in there later.
Any shop can do it, but if they shove them in quickly they can damage the very orings that will send you back in there later.
Cargo Master
Joined: Mar 2008
Posts: 2,975
Likes: 19
From: Archdale,N.C.
Absolutely do them yourself. You won't have to worry if they were done correctly. If I can do them surely you can. For me the toughest part is removing the passenger side valve cover. All in all its not that difficult.