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Old August 20th, 2009, 01:21 AM   #1
unclebeaner
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2000 s-10 yet again its a long one this time

well my poor little s-10 has been a truck but his year seems to have faile me again. alright here we go

i take out truck it can idle forever drive down the road just like normal no problem. so after driving it around for a while if i try and get on it from a get go it will back fire out of the intake and hardly run you try and give it gas it acts like its running out of fuel and it pops and misses like crazy and will limp home. it will sit for a while and run great. no codes, good fuel pressure, and tune up components are new. only other thing i can witness is it idles kinda high and it doesnt wanna downshift correctly.

if you have no knowledge and think because your truck stalled on time because your left blinker light was out or dont know what i speak of dont comment on this.thanks
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Old August 20th, 2009, 02:25 AM   #2
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What year S10 and what is good fuel pressure? I ask both those questions because my wifes Bravada started acting like that and progressively got worse. I am not sure what the Fuel pressure is supposed to be for CPI? I think they did away with CPI starting in 1998 and replaced it with TBI and it needs between 60 and 66 psi to run correctly. Did you actually check the fuel pressure while driving it under load? Fuel pump and intake manifold gaskets are the two number one problems with the S10 series trucks. I would also try a new fuel filter for shits and giggles they are $12 at autozone. I would have to say it is definitely a lean condition, if not getting enough fuel at idle it will cause it to idle high and would for 100% sure cause it to run as described under load. Also intake or TBI gaskets being bad would also cause the lean condition because it would be sucking air.

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Old August 20th, 2009, 02:53 AM   #3
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Quote:
Originally Posted by Disturban
What year S10 and what is good fuel pressure? I ask both those questions because my wifes Bravada started acting like that and progressively got worse. I am not sure what the Fuel pressure is supposed to be for CPI? I think they did away with CPI starting in 1998 and replaced it with TBI and it needs between 60 and 66 psi to run correctly. Did you actually check the fuel pressure while driving it under load? Fuel pump and intake manifold gaskets are the two number one problems with the S10 series trucks. I would also try a new fuel filter for shits and giggles they are $12 at autozone. I would have to say it is definitely a lean condition, if not getting enough fuel at idle it will cause it to idle high and would for 100% sure cause it to run as described under load. Also intake or TBI gaskets being bad would also cause the lean condition because it would be sucking air.
4.3 used CSI, 60-66 PSI; 2.2 used SFI, 41-47 PSI.

TBI hasn't been used in Chevy's since like '95, far as I know.

Ever check the fuel pressure while its acting up? Or just after it has sat?
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Old August 20th, 2009, 03:09 AM   #4
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Originally Posted by 1988JeepXj View Post
4.3 used CSI, 60-66 PSI; 2.2 used SFI, 41-47 PSI.

TBI hasn't been used in Chevy's since like '95, far as I know.

Ever check the fuel pressure while its acting up? Or just after it has sat?
Our 2000 is MPFI, they used TBI from 1988 to 1992 then in 1993 the Vortech used CPI with the popet injectors until I believe 1995ish and the switched to MPFI so they say? It dont look like a MPFI system though? I have one gas line coming in to the throttle body and no fuel rails or injectors for each cylinder so I am assuming it is just a modern TBI? Confused now I am going to go look tomorrow...I could swear it is a TBI setup of some sort?

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Old August 20th, 2009, 04:06 AM   #5
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It should be two fuel lines, a feed and a return, going into a plastic intake plenum, underneath which is the central injector module, and the 6 poppet valves.

CPI is non-sequential (93-94?), CSI is sequential. 95ish is when they switched to central sequential, which still uses poppet valves, thus requiring the strict 60psi pressure threshold.

Sorry for the hijack unclebeaner.
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Old August 20th, 2009, 10:19 AM   #6
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Quote:
Originally Posted by unclebeaner View Post
well my poor little s-10 has been a truck but his year seems to have faile me again. alright here we go

i take out truck it can idle forever drive down the road just like normal no problem. so after driving it around for a while if i try and get on it from a get go it will back fire out of the intake and hardly run you try and give it gas it acts like its running out of fuel and it pops and misses like crazy and will limp home. it will sit for a while and run great. no codes, good fuel pressure, and tune up components are new. only other thing i can witness is it idles kinda high and it doesnt wanna downshift correctly.

if you have no knowledge and think because your truck stalled on time because your left blinker light was out or dont know what i speak of dont comment on this.thanks
what engine do you have? 2.2 or 4.3
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Old August 20th, 2009, 10:22 PM   #7
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2.2 yes is checked under load and when its cool. no intake leaks which i am 100 percent positive. ignition module tested fine along with coil packs. ill figure it out sooner or later it just isnt top on the list of shit to do
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