2006-07-05 04:24:51 · 9 answers · asked by Karl 1 in Cars & Transportation ➔ Car Makes ➔ Chevrolet
Short answer...Worn crankshaft main bearings. This is common as an engine gets older. I recommend adding some LUCAS Engine oil treatment. It makes the oil stick to the bearings better to help avoid dry start knock on your bearings. The main problem is that as the bearing wears, the gap betweent the bearing and the crankshaft gets bigger. This gap allows the oil to drain fully away from the bearing and crankshaft surface. So when you start the engine, the bearings are being run 'Dry' for a couple seconds untill the oil pump gets oil to them. The Lucas additive helps the oil stay on the bearing surface to prevent this problem.
I have the same problem with my Ford Escort with alot of miles on it. The Lucas took the knock out immediately. I have been using it for over 15,000 miles so far successfully. Good luck!
2006-07-05 04:47:44 · answer #1 · answered by FreedomLover 5 · 3⤊ 0⤋
Is it a Knock or a Tap/Rattle? If it's a Knock it's probably due to worn main/rod/cam bearings. If it's a Tap/Rattle, it's probably because your rocker arms/cam shaft clearance needs adjusting.
Check your oil level and oil filter first, and then the oil sending unit. Then investigate the rocker/cam, and finally the bearings. A thicker oil will help, but this will not be a long term solution. Since it gets quite on the second start it sounds like your pump is working.
2006-07-05 12:15:26 · answer #2 · answered by gamecock009 1 · 0⤊ 0⤋
My 97 suburban's oil pressure sending unit went out recently and we replaced the fuel pump after draining all 44 gallons of gas. and bought a new fuel pump. then it still didnt work so we thought it might be the computer, but it was the oil pressure sending unit. I know this has nothing to do with your question but check that if your car wont ever start.
2006-07-05 11:32:05 · answer #3 · answered by Anonymous · 0⤊ 0⤋
My husband says this could be a cracked flywheel. Sometimes it will make a loud noise like an engine knock & other times will be quiet. I'm not sure about the Suburbans, but I know this was a major problem with the early Astro vans.
2006-07-06 01:34:52 · answer #4 · answered by Anonymous · 0⤊ 0⤋
The Chevy 350 cid engine had some issue's with main and rod bearings. I have done quite a few of these. There is a GM service bulletin out there that discusses this issue.
2006-07-06 13:10:50 · answer #5 · answered by jarhed 5 · 0⤊ 0⤋
It is more likely a function of worn out oil or crankshaft bearings.
Jules, auto tech and lecturer. Australia.
2006-07-05 11:29:23 · answer #6 · answered by Jules G 6 · 0⤊ 0⤋
It probally is a lifter stuck in the engine...it is usually cased by not haveing enough oil in the engine or not haveing enough oil preasure.
2006-07-05 15:06:21 · answer #7 · answered by Anonymous · 0⤊ 0⤋
my 94 does the same thing, i heard it was a big problem with chevys but i would call the dealer to be sure
2006-07-05 13:33:01 · answer #8 · answered by marcosm_65 3 · 0⤊ 0⤋
It's called BUY A FORD! You said what the problem was CHEVY.
2006-07-05 12:38:01 · answer #9 · answered by Anonymous · 0⤊ 0⤋