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Author Topic: truck wont idle  (Read 3955 times)

Offline huntnfmly

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truck wont idle
« on: February 13, 2012, 09:00:00 PM »
Pulling my hair out. I have a 89 Chev pu 305 tbi truck idles when cold when it warms up idle slowly drops then dies I have replaced fuel pump during. A hunting trip that's another story. Also replaced iac it just happened one day any help would be great thought I would get some opinions before I run it to the shop and pay their diagnostic. Fee
I'm your dam tour guide Arnie please don’t wonder off the dam tour.
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Offline Bulldozer

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Re: truck wont idle
« Reply #1 on: February 13, 2012, 09:16:31 PM »
Being TBI you probably have a vacuum leak somewhere.
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Offline jrebel

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Re: truck wont idle
« Reply #2 on: February 13, 2012, 09:18:14 PM »
I had a ford escort that would do that and it took me forever to find the problem.  Ended up being a vaccuum hose that went into the top of the valve cover of all places.  It cost me a whopping $2 to fix it.  It would run find when cold then once it was warm it would die every time I came to a stop unless I kept the idle up.  I am no mechanic and I have know Idea why that would do that, but it did.  So maybe check all your vaccuum hoses....usually you can hear them drawing air and kinda hissing. 

Good Luck

Offline coachcw

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Re: truck wont idle
« Reply #3 on: February 15, 2012, 09:42:47 PM »
make sure that you have a good vaccum supply to the map sensor, they plug up in the throttle body . also check the pcv system to see that its not plugged up in the tbi. if it runs well at road speeds the reat of the tune is most likley ok. at idle your iac counts should be around 15-20 counts .if it's down around zero then you probilly have a vaccum leak .good luck.

Offline Widgeondeke

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Re: truck wont idle
« Reply #4 on: February 15, 2012, 10:21:55 PM »
I had an 89 GMC. Did the same thing. I recall it was a vacuum related leak and the TBI.

Offline luckyman

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Re: truck wont idle
« Reply #5 on: February 17, 2012, 05:45:47 AM »
Check the egr. They Can carbon up and cause that.
I'm not sure.

Offline huntnfmly

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Re: truck wont idle
« Reply #6 on: February 17, 2012, 11:04:51 AM »
Thanks everybody. Is there. Any problem with disconnecting vacuum lines going to Tbi. And squirting Carb cleaner to clean out?
I'm your dam tour guide Arnie please don’t wonder off the dam tour.
Take as many dam pictures as you want ....
Are there any dam questions ..

Offline huntnfmly

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Re: truck wont idle
« Reply #7 on: February 17, 2012, 01:10:15 PM »
I was just checking the egr.I unplugged it and there was no change then I sprayed starter fluid on it and there was no change . That should of acted. Like a vacuum leak and revved up shouldn't. It have? I hope so maybe. That's the issue
I'm your dam tour guide Arnie please don’t wonder off the dam tour.
Take as many dam pictures as you want ....
Are there any dam questions ..

Offline Buckmark

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Re: truck wont idle
« Reply #8 on: February 17, 2012, 01:18:37 PM »
I was just checking the egr.I unplugged it and there was no change then I sprayed starter fluid on it and there was no change . That should of acted. Like a vacuum leak and revved up shouldn't. It have? I hope so maybe. That's the issue
Nope, if the valve is closed it wont rev up, and it should be closed at idle
To hunt and butcher an animal is to recognize that meat is not some abstract form of protein that springs into existence tightly wrapped in cellophane and styrofoam.

Offline RoyBoy

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Re: truck wont idle
« Reply #9 on: February 27, 2012, 11:48:50 PM »
did you check your  0 2 sensor? mine broke in my 94 chev and it wouldnt idle either  :twocents:
"It aint about how hard you hit. Its about how hard you can hit and keep moving forward! how much you can take and keep moving forward!!
 
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