90 3.0 tries to die at idle. help!
06-02-2007, 12:15 AM
#1
Registered User
Thread Starter
Join Date: Sep 2006
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
90 3.0 tries to die at idle. help!
when sitting at a red light or just idleing my truck tries to die. it does die alot and sometime it doesnt. the previous owner said it might be the tps sensor. no check engine light or anything. when it doesnt die it idles at 1k and runs smooth. it has 274k mi if that helps. what do yall think it could be. and yes i did search. thnks!
06-02-2007, 08:51 AM
#3
Registered User
Join Date: Jan 2006
Location: TN native stuck in AL
Posts: 256
Likes: 0
Received 0 Likes
on
0 Posts
Hows your plugs, wires, rotor, cap? Checked for vacumn leaks? Broken vacumn hoses? Throttle body clean? Both boots leading to throttle body have any splits? Air filter clean? PCV valve clean, hose OK. Timing?
06-03-2007, 05:54 AM
#5
Contributing Member
Join Date: Apr 2006
Location: TENN Native Languishing in Virginia
Posts: 4,787
Likes: 0
Received 34 Likes
on
14 Posts
How about some details on the engine/vehicle?
The TPS doesn't really control anything at idle. Idle problems are usually caused by vacuum leaks, electrical problems, etc.
The TPS doesn't really control anything at idle. Idle problems are usually caused by vacuum leaks, electrical problems, etc.
06-03-2007, 11:18 AM
#6
Registered User
Thread Starter
Join Date: Sep 2006
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
well its a 90 model 3.0 pickup. it has 274k mi. it runs pretty good. sometimes at idle it idles about 1k and runs smooth and then sometimes it starts to drop rpm's and wants to die. it does die alot but if the rpm's drop and it doesnt die. it sits there and idles horriably. like its got a big freaking cam in it. but i can tap the gas and it smooths out and. so i dont think it is a fuel problem. no check engine lights or nothing. idk. i wish i could get out and leave it running w/o worring if its going to stay running.
06-03-2007, 11:26 AM
#7
Contributing Member
Join Date: Apr 2006
Location: TENN Native Languishing in Virginia
Posts: 4,787
Likes: 0
Received 34 Likes
on
14 Posts
Check your butterfly valve in the TB. Sometimes gunk builds up around it and holds it open. That's where you may have set the idle. Then it will close up like it's supposed to once in a while & you'll let your low lumpy idle.
Trending Topics
06-03-2007, 08:19 PM
#9
Contributing Member
Join Date: Apr 2006
Location: TENN Native Languishing in Virginia
Posts: 4,787
Likes: 0
Received 34 Likes
on
14 Posts
I think there are other things to look at before you guess TPS. Get some Valvoline Throttle Body Cleaner (or equivalent, but it works great) and clean the TB out good, REMOVE THE PLUGS & pump the excess out before you start the engine over to avoid hydro locking it and blowing a HG or bending a rod.
Thread
Thread Starter
Forum
Replies
Last Post
DiZ86
Pre 84 Trucks
12
12-27-2015 09:33 PM
