rough idle after new motor - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dropped87 · 07-10-2001, 07:30 AM

Cracked a head on my old motor and just dropped in a new Vortec 350 but I am having some problems. Here is the setup: Factory Vortec 350, with my original TBI with GM #12496821 intake. Everything bolted up pretty well, just had to do some plumbing for the EGR. The problem I am running into is now that I have the truck out of the shop it idles kinda rough and is a little hesitant in the A.M. Ran diagnostics and the temp sensor was not registering the correct temp, so I replaced it. I also went ahead and replaced the throttle position sensor, no help. My only thought at this point is that when I cracked the head, the TBI filled with steam from the block, and might have hosed something up. Any sugesstions?

07-10-2001, 07:30 AM	#1
dropped87 Registered User Join Date: Jun 2000 Location: Greenville, TX, Posts: 29	rough idle after new motor Cracked a head on my old motor and just dropped in a new Vortec 350 but I am having some problems. Here is the setup: Factory Vortec 350, with my original TBI with GM #12496821 intake. Everything bolted up pretty well, just had to do some plumbing for the EGR. The problem I am running into is now that I have the truck out of the shop it idles kinda rough and is a little hesitant in the A.M. Ran diagnostics and the temp sensor was not registering the correct temp, so I replaced it. I also went ahead and replaced the throttle position sensor, no help. My only thought at this point is that when I cracked the head, the TBI filled with steam from the block, and might have hosed something up. Any sugesstions? __________________ 1987 SWB Silverado, EFI 350 w/700R4, lowered 5/7 with 17" Impalas on BFG rubber.



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