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09-29-2010
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#1 |
Join Date: Jan 2008
Location: antioch
Posts: 167
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strange loud ticking noise under plenum
I have a strange loud ticking noise from under plenum. Also i noticed when i drove the car this morning that the oil pressure gauge was erratic and eventually went to 0. When apply throttle it goes back up to normal reading. Could it be the oil pressure gauge that causing this and need to be replace?
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09-29-2010
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#2 | |
 
Join Date: May 2008
Location: USA
Posts: 1,093
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Re: strange loud ticking noise under plenum
Quote:
Check your oil level. The ticking would make me nervous, what kind of ticking? |
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09-29-2010
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#3 |
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Join Date: Dec 2008
Location: San Diego
Posts: 189
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Re: strange loud ticking noise under plenum
The ticking could be a plug wire. I know that when I was messing with my Z a few weeks ago we were pulling the plug wires to find a dead cylinder and it was definitely a loud click when it would fire. Just a guess...
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09-29-2010
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#4 |
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Join Date: Jan 2008
Location: antioch
Posts: 167
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Re: strange loud ticking noise under plenum
The noise sounds like its coming from the lifters and travel up to plenum. Oil level is fine. The noise gets louder when apply throttle.
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09-29-2010
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#5 |
 
Join Date: Aug 2008
Location: Houston, TX
Posts: 2,314
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Re: strange loud ticking noise under plenum
Bad lifter.
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09-29-2010
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#6 |
Join Date: Dec 2003
Location: Arcadia, OK
Posts: 3,392
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Re: strange loud ticking noise under plenum
There are two oil pressure sensors on the LT5. The big one on the top of the oil filter adapter is the sender for the gauge. The other is for a warning light on the panel.
The top sensor has a male 1/8"NPT thread where it screws into the oil filter adapter housing. I suggest that you buy a 4" long 1/8" pipe nipple & the fittings to attach a pressure gauge (suggest 0~100 psi or there-abouts) Install the gauge & see the pressure before installing a new sender. The whole test apparatus can be had for about $25.00. The ticking sound made by a lifter can be one of the first indicators of low oil pressure. You need to know from a real gauge. Afterwards, you will know if your sender is bad, whether a new one is needed and how accurate your dash panel gauge is reading. If oil pressure is above 15 pis at idle and the ticking is still present, set emerg brake, put in 2nd gear, no throttle and slowly release the clutch untill engine rpm pulls down. Get back to us if the noise quits when a load is on the engine.
__________________
Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. Last edited by A26B; 09-29-2010 at 03:37 PM. |
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09-29-2010
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#7 |
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Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,843
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Re: strange loud ticking noise under plenum
Have you recently changed the oil and filter?
H |
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09-29-2010
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#8 |
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Join Date: Jan 2008
Location: antioch
Posts: 167
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Re: strange loud ticking noise under plenum
I did change the oil and filter recently. The motor ran fine after the oil change. I will spend sometime on Friday. Jerry is probably right and i will follow his suggestions. I will get back to you guys on this.
Shayne |
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09-29-2010
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#9 |
Join Date: Aug 2005
Location: Scottsdale, AZ
Posts: 2,446
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Re: strange loud ticking noise under plenum
antioch, IL?
you could go see Marc H |
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09-29-2010
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#10 | |
Join Date: Oct 2004
Location: Folsom CA
Posts: 1,657
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Re: strange loud ticking noise under plenum
Quote:
He's in Antioch CA. It would be a 3 day drive to see Marc H. How many miles on her? Has she made this sound before? What filter and what oil did you use? Normally the mighty LT5 is nearly bullet proof so I wouldn't be too worried... but you never know... TomC 'Crabs |
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