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#1
09-08-2004, 05:25 PM
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Knocking at start up ?????
I have a 97 K1500 with a 350 vortec engine. When it sits overnight and I start it in the morning everything sounds great. When it sits for about 15 min or 30 mins it knocks for a few seconds at start up. What can it be?
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#2
09-09-2004, 03:46 AM
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Re: Knocking at start up ?????
about how many seconds? about 30 to 45 seconds. if so main bearings, it happened on my truck there is a bullettin on the GM Vortecs about it I can't remember were it is. The guy that rebuilt my engine found it on a disk about it. I beleive the crank was not torqued even. It usaully happens at about 80000 to 100000 miles.
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#3
09-09-2004, 11:16 AM
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Re: Knocking at start up ?????
Actually, it only for about 1 to 2 seconds, then it just goes away.
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#4
09-09-2004, 09:38 PM
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Re: Knocking at start up ?????
Sounds like its not oiling proper then if it does it after it just sets for a few minutes compared to not doing it over night.
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**1966 Chevy II**  355 SBC, Turbo 400, 5.13 gear, IHRA Certified to 8.50 in the 1/4 Last Race (10-6-07) So its been awhile... Dial: 6.77, RT: -.0001, 60': 1.4360, 1/8th: 6.7942 @ 100.65 mph Fastest Pass of '07 (10-6-07) 60': 1.4360, 330': 4.3453, 1/8th: 6.7942 @ 100.65 mph 25 and in BIG TIME Debt Crew member #2  Deuce's Wild Racing: Take a Ride on the WILD SIDE 
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#6
09-10-2004, 10:42 AM
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Re: Knocking at start up ?????
Actually, I just got the truck so I don't know what type of filter is has. I'll be changing the oil this weekend, perhaps the filter it has doesn't have a check valve. I do know that it's not an ac delco or fram filter so that might be it.
Thanks, I'll let you guys know the outcome. Homerun
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