Knocking Sound From down Under ......
Thread Starter
7th Gear
Joined: Nov 2007
Posts: 7
Likes: 0
Knocking Sound From down Under ......
It's a 90 Vette with six speed. I have intermittent knocking sound from the bottom of the engine area only after the engine fully warm up, the noise is worst with the a/c on. Every now and then it stalls out and I have to wait 5- 10 minutes before I can restart it. I went under the car with engine on , it sound like it's coming from inside the oil pan. Does anyone have a problem with their Vette like this and what can I do figure out exactly what's the problem here and what to do ???????????
Former Vendor
Joined: Nov 2006
Posts: 2,482
Likes: 3
From: Carmichael ca
Knocking noise from inside the oil pan? Not good. How's the oil pressure?
Your next move would be to drop the oil pan (can be done with engine in car) and check some rod and main bearings.
Good luck, Paul
Your next move would be to drop the oil pan (can be done with engine in car) and check some rod and main bearings.
Good luck, Paul
Racer
Joined: Aug 2006
Posts: 277
Likes: 8
From: Calgary Alberta
Knocking?
I had the same problem with my '90 6 spd. Take a long piece of wood and try to trace the knock.... On my car I traced the sound to the passenger side of the transmission/engine. Then zero'd in on the starter,I replaced the starter and threw in a heat shield and all is well. I don't have headers on the car, the old starter was just getting heat soaked. Hope this helps
Safety Car
Joined: Jan 2006
Posts: 3,566
Likes: 4
From: Mt Laurel NJ
St. Jude Donor '06-'07
It's a 90 Vette with six speed. I have intermittent knocking sound from the bottom of the engine area only after the engine fully warm up, the noise is worst with the a/c on. Every now and then it stalls out and I have to wait 5- 10 minutes before I can restart it. I went under the car with engine on , it sound like it's coming from inside the oil pan. Does anyone have a problem with their Vette like this and what can I do figure out exactly what's the problem here and what to do ???????????
Good luck, let us know how you make out.
Randy
Advanced
Joined: Jan 2008
Posts: 75
Likes: 0
From: hinton ia
you test the injectors with the engine off, injectors in place but you unplug the wireing harness and use a multimeter to test resistance/ ohms by connecting the test leads to the 2 metal prongs or what ever you want to call them, where the wireing harness hooks up. check when cold, hope this helps i guess i kinda suck at explaining this stuff. good luck and let us know what you find out.
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Safety Car
Joined: Jan 2006
Posts: 3,566
Likes: 4
From: Mt Laurel NJ
St. Jude Donor '06-'07
you test the injectors with the engine off, injectors in place but you unplug the wireing harness and use a multimeter to test resistance/ ohms by connecting the test leads to the 2 metal prongs or what ever you want to call them, where the wireing harness hooks up. check when cold, hope this helps i guess i kinda suck at explaining this stuff. good luck and let us know what you find out.
Randy