Runs rough when warm
Thread Starter
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Freshman User
Joined: Mar 2004
Posts: 45
Likes: 0
From: Idaho
Runs rough when warm
My '99 SD V10 (4wd,auto, crew cab, short box, Lariat) runs rough when warm. It is smooth when cool, but the longer it runs the worse it gets. I have 45k miles, new fuel filter, clean air filter, and a tank of Gum-Out through it.
It just doesn't seem to have the power it used to have, either, but that is very subjective.
I'll take it to the dealership, but I'd like to get some ideas about what the problem could be before I give myself (and my checkbook) to the dealer's tender mercy.
Any suggestions?
It just doesn't seem to have the power it used to have, either, but that is very subjective.
I'll take it to the dealership, but I'd like to get some ideas about what the problem could be before I give myself (and my checkbook) to the dealer's tender mercy.
Any suggestions?
Post Fiend
Joined: Jan 2002
Posts: 5,859
Likes: 7
From: USA
It can be a # of things !
1)cop going bad (coil on plug)
2)could be plugs (might be loose or worn)
3)any # of sensors that control engine idle and fuel trims
4)Iac valve dirty or sticking.
Its not easy to determin without a scanner or manuals to chk voltage ref's
scanning can point to a certain cylinder for misfire
Take it in have them look at
Rich
1)cop going bad (coil on plug)
2)could be plugs (might be loose or worn)
3)any # of sensors that control engine idle and fuel trims
4)Iac valve dirty or sticking.
Its not easy to determin without a scanner or manuals to chk voltage ref's
scanning can point to a certain cylinder for misfire
Take it in have them look at
Rich
Thread Starter
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Freshman User
Joined: Mar 2004
Posts: 45
Likes: 0
From: Idaho
Thanks!
Rich -
Thanks for the list! That is what I was looking for - some suggestions of what to ask the service guys about, so they don't charge right off and do the most expensive thing first.
Thanks for the list! That is what I was looking for - some suggestions of what to ask the service guys about, so they don't charge right off and do the most expensive thing first.
