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94 s-10 blazer still runs ruff after tune-up
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jcshort
User
Mar 15, 2011, 10:02 AM
Post #1 of 10
(2000 views)
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94 s-10 blazer still runs ruff after tune-up
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i have a 94 s-10 blazer with a 4.3muti-port injection system i;ve done complete tune-up all filters,plugs,wires cap rotor and it still runs ruff and idles bad and stalls any ideas what could be going on.
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 15, 2011, 10:04 AM
Post #2 of 10
(1996 views)
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Re: 94 s-10 blazer still runs ruff after tune-up
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Is the check engine light coming on at all?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jcshort
User
Mar 15, 2011, 10:10 AM
Post #3 of 10
(1992 views)
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Re: 94 s-10 blazer still runs ruff after tune-up
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nope no lights no nothing
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 15, 2011, 10:16 AM
Post #4 of 10
(1989 views)
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Re: 94 s-10 blazer still runs ruff after tune-up
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You don't have a multiport, you have a Centralport system.
You're going to have to do some investigating to determine exactly what is happening, whether it be misfiring, running lean, running rich, possible EGR sticking open.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jcshort
User
Mar 15, 2011, 10:26 AM
Post #5 of 10
(1985 views)
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Re: 94 s-10 blazer still runs ruff after tune-up
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ok, i knew it wasnt a tbi just wasnt sure it was the cpi cause the way the intake looked could the Ignition Control Module have any thing to do its the only part i didnt replace? it really idles like it has an after market cam in it lol
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 15, 2011, 10:28 AM
Post #6 of 10
(1983 views)
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Re: 94 s-10 blazer still runs ruff after tune-up
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Throwing parts at it is not the solution.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jcshort
User
Mar 15, 2011, 10:36 AM
Post #7 of 10
(1979 views)
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Re: 94 s-10 blazer still runs ruff after tune-up
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lol yeah i know it can be a waste of money. just looking for a starting point really i"ll check the stuff you posted here in a bit but if all checks out good then what?
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 15, 2011, 10:47 AM
Post #8 of 10
(1976 views)
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Re: 94 s-10 blazer still runs ruff after tune-up
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It can't all check good. You just have to determine what is going on in the engine.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jcshort
User
Mar 15, 2011, 11:09 AM
Post #9 of 10
(1972 views)
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Re: 94 s-10 blazer still runs ruff after tune-up
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i understand that totally theres something causing to run like it is jus have to hunt it down
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tireman77
Novice
Mar 23, 2011, 6:07 PM
Post #10 of 10
(1957 views)
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Re: 94 s-10 blazer still runs ruff after tune-up
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Take the EGR valve off of it and clean it out with some carb cleaner. i think hammer time suggested it. they have a lot of trouble with those EGR valves getting carbon stuck in them and holding the pintle open just a little. take it off clean it out and start the truck up for a split second to blow the crap out of the intake. they also make a gasket with a screen in it.
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