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1998 S-10 knocks and rough idle at start

Tiny
S10
  • MEMBER
  • 1998 ALL OTHER MAKES ALL OTHER MODELS
I have a Vortec 4.3 that knocks and idles roughly when I start it, especially on cold mornings or after it sits for a while. The knock seems loudest over cylinder 1. I ran engine cleaner (Gunk) through it once and it seemed to solve the problem. The knocking returned 1000 miles later. Put Gunk in a second time, changed the oil, and is silenced the noise until about 750 miles on the new oil. The engine has 76K miles on it. What is going on and about how much would it cost to fix it?
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Wednesday, January 18th, 2006 AT 2:52 PM

2 Replies

Tiny
AVALANCHE1
  • MEMBER
  • 2 POSTS
I have the same problem with my 5.3 lit avalanche, took it in its still under warranty the told me it was carbon build up burning off and gave a written guarentee for 100,000 miles a few other friends have gotten the same thing
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Thursday, January 19th, 2006 AT 9:34 AM
Tiny
S10
  • MEMBER
  • 2 POSTS
I just got a call from the shop. The lifters had lost their prime.
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Thursday, January 19th, 2006 AT 9:49 AM

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