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94 4.3 vortec cpi chugging

8 messages,  Last post on Oct 19, 2009 at 11:02 AM

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#5 of 8 Re: 94 4.3 vortec cpi chugging [biggestmexi] by pcgeek Sep 03, 2008 (7:51 pm)
Replying to: biggestmexi (Nov 19, 2007 10:27 am) That sounds like the 'nut kit' needs to be replaced. If the oil is gassy, or the exhaust smells rich or gas drips off the back of the engine, spend the $40 on the kit. It made a big improvement for me.     Replies to this message: garys_nj (Mar 29, 2009 10:23 am) tony2980 (Oct 19, 2009 10:56 am)
#6 of 8 Re: 94 4.3 vortec cpi chugging [pcgeek] by garys_nj Mar 29, 2009 (10:23 am)
Replying to: pcgeek (Sep 03, 2008 7:51 pm) I think the "nut kit" you're referring to is the gas feed and return lines to the CPI (Spider). I have a problem with my s-10 blazer 4.3 vortec where it stalls and then won't restart without either (and then still sometimes won't start). I tried a couple things fixed some vacume leaks and changed spark plugs. it always had a lopey idle, now much worse idle and still stalling.. I removed the plenum and see a lot of gas in the intake belly around the spider and the gas feed line is almost worn through (contact with a poppet line). with pressure, I only see a weep from the feed line but I'm changing the spider and the feed/return lines (the nut?). seems like there's a bolt on a holding plate for the feed/return nipples) but I can't get a wrench or socket on it. anyone know how to replace the feed/return lines?? Replies to this message: tony2980 (Oct 19, 2009 10:56 am)
#7 of 8 Re: 94 4.3 vortec cpi chugging [garys_nj] by tony2980 Oct 19, 2009 (10:56 am)
Replying to: garys_nj (Mar 29, 2009 10:23 am) its not a nut its a star head to change those lines after you remove the star and the plate the lines slide out i had to use a tool that looked like an L shape they sell them at auto zone in a kit it was like 9.99 itwas a t30 ithink its been awhile or a t15 torx head thats what they are called
#8 of 8 cpi unit by tony2980 Oct 19, 2009 (11:02 am)
my blazer cranks up and runs but it sounds and idles like i have a big cam in it it runs really rough but at 65 70 it runs alot smoother i had it checked out at shop because i kept changeing stuff and my pockets are not that deep they are tellin me its the spider injection cpi unit and its kinda costly any suggestions

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