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02-13-2011, 01:28 AM
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#1 |
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Registered User
Join Date: Jan 2006
Location: Garland, TX
Posts: 970
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bad idling problem
I have a serious problem that I cant figure out. Its my truck, it wont idle right. Its an 89 trottle body 350 and it sounds reved up in park but when it goes into reverse or drive in revs up and down. Is there a sensor that went out and which one? Or what should I try?
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'84 swb chevy '69 swb chevy '68 swb chevy '95 Impala ss-sold '89 chevy crew cab dually 3+3 |
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02-13-2011, 08:25 AM
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#2 |
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Registered User
Join Date: Sep 2010
Location: Toledo, Ohio
Posts: 106
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Re: bad idling problem
idle air control valve will do that
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02-15-2011, 04:20 PM
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#3 |
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Registered User
Join Date: Jan 2006
Location: Garland, TX
Posts: 970
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Re: bad idling problem
should i take it off and clean it or what?
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'84 swb chevy '69 swb chevy '68 swb chevy '95 Impala ss-sold '89 chevy crew cab dually 3+3 |
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02-15-2011, 08:41 PM
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#4 |
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Registered User
Join Date: Sep 2010
Location: Toledo, Ohio
Posts: 106
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Re: bad idling problem
I never had any luck cleaning them before....try unplugging the connector and see if it smooths out at all
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02-15-2011, 09:22 PM
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the pollock
Join Date: May 2008
Location: abilene, texas
Posts: 4,423
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Re: bad idling problem
or a serious vaccum leak
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Jack of ALL trades, Master of none.. (but one... procrastination) Army vet 02-08 RIP El Jay! Miss you brother! http://67-72chevytrucks.com/vboard/s...d.php?t=343538 http://67-72chevytrucks.com/vboard/s...d.php?t=386042 |
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02-15-2011, 09:27 PM
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#6 |
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Registered User
Join Date: Jan 2006
Location: Garland, TX
Posts: 970
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Re: bad idling problem
all my vacumm lines are in and dont seem to have cracks in them. If I disconnect the vaccum from the pcv it idles a lot higher and even normal when you shift and put load on it. Once you accelerate it dies though. I did disconnect the iac this past weekend but didnt help. Im almost to the point of swapping to carb.
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'84 swb chevy '69 swb chevy '68 swb chevy '95 Impala ss-sold '89 chevy crew cab dually 3+3 |
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02-25-2011, 03:50 PM
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#7 |
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Registered User
Join Date: Jan 2006
Location: Garland, TX
Posts: 970
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Re: bad idling problem
btt
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'84 swb chevy '69 swb chevy '68 swb chevy '95 Impala ss-sold '89 chevy crew cab dually 3+3 |
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02-25-2011, 06:04 PM
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#8 |
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Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,621
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Re: bad idling problem
It sound like it could be low fuel pressure to me.
Here is a thread with fuel pressure testing information and some other test information you can use. http://67-72chevytrucks.com/vboard/s...=1#post3362772 You can do a search in the 1988-1998 forum an find many threads on this topic. Edit: More threads to look at. http://67-72chevytrucks.com/vboard/s...t=surging+idle http://67-72chevytrucks.com/vboard/s...ight=poor+idle
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For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. Last edited by ChevyTech; 02-25-2011 at 06:27 PM. |
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02-27-2011, 10:52 AM
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#9 |
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Registered User
Join Date: Jan 2006
Location: Garland, TX
Posts: 970
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Re: bad idling problem
Well I figured I would get more help here since my truck is as square body even though its a 89 model.
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'84 swb chevy '69 swb chevy '68 swb chevy '95 Impala ss-sold '89 chevy crew cab dually 3+3 |
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02-27-2011, 12:18 PM
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#10 |
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Registered User
Join Date: Feb 2011
Location: Abilene Kansas
Posts: 18
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Re: bad idling problem
you might try replacing the intake manifold gasket if they are leaking it will cause the same problem
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02-27-2011, 11:28 PM
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#11 |
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Registered User
Join Date: Jan 2006
Location: Garland, TX
Posts: 970
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Re: bad idling problem
well those are brand new. I had a head job done to it and all that is fairly new. I did take the iac off and broke it putting it back in so I now have to buy another. So new iac, pcv, and temp sensor will go in to see if it fixes the problem.
I was reading that you could take the vac line to the booster off and place your thumb on it and if it does nothing to the rpms then its not that but what do you do if I have a hydroboost?
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'84 swb chevy '69 swb chevy '68 swb chevy '95 Impala ss-sold '89 chevy crew cab dually 3+3 |
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03-25-2011, 09:59 PM
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#12 |
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Registered User
Join Date: Sep 2010
Location: Toledo, Ohio
Posts: 106
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Re: bad idling problem
any update? is it fixed?
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03-26-2011, 03:33 AM
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#13 |
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Registered User
Join Date: Dec 2005
Location: Wasilla Alaska
Posts: 73
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Re: bad idling problem
since you did have the intake off to do the heads, you might check the timing first.
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2017 Tahoe Premier - Daily '99 Silverado 2500 Wife's whip- 2020 Equinox Premier |
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03-26-2011, 01:53 PM
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#14 |
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Kid's Mechanic
Join Date: Nov 2006
Location: Kansas City
Posts: 8,241
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Re: bad idling problem
The throttle bodies had a bad habit of sucking the base gasket out .
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