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08-30-2014
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#1 |
 Join Date: Mar 2013
Location: Roswell, GA
Posts: 234
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Clicking Noise Heard Upon Throttle Stab
Hearing a little clicking noise when a mildly stab the throttle from idle. Got my stethoscope out but seem most noticeable if I removed the rod part and just listened in the general exhaust area. Couldn't pick up much when placing the rod against the IH's or head. I guues it could be an exhaust leak but it sounds to metallic for that. Engine runs fine. I did just complete some port work on the heads and it is possible a few small flecks of aluminum may have made it into the cylinder. Not that familiar with OHC engines and looking for some input regarding possible cause and additional diagnostic ideas.
I can also hear a little click when driving with the windows open at times. Just dyno'd the engine to 7000 rpm and it achieved 400 rwhp. Clicking was there before testing however. Thanks!
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1995 ZR1 #159 Ported,Corsa,4.10 Rear, Dual Disc RAM Clutch, Alum Flywheel, Haibeck Chip, ZFDoc Plates, Relocated Battery 400 rwhp 1992 ZR1 #280 Ported, Locked Secondary's, Flowmaster Exhaust, Haibeck Chip, 375rwhp 1996 Collectors LT4 (Stock) 1972 Convertible 434 Small Block 572 rwhp |
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08-31-2014
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#2 |
 Join Date: May 2007
Location: Addison IL
Posts: 250
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Re: Clicking Noise Heard Upon Throttle Stab
It's likely that the dual mass flywheel is a little loose. It's just an annoying sound. It might get louder but does not lead to a catastrophic failure. You can address it when the next clutch service is due.
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09-02-2014
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#3 |
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Join Date: Mar 2013
Location: Roswell, GA
Posts: 234
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Re: Clicking Noise Heard Upon Throttle Stab
After further checking I am not sure if sound is coming from rear of engine. It is a light metallic tick that would be compatible to a noisy lifter. It only happens upon throttle stab at idle and also seems to happen while throttling under load. I wish there were a trained ear locally I could bring it to who knows these engines. I have also heard similar sounds form noisy cam chain followers on other OHC engines. Is there anything in the valve train that could be the cause if it isn't the fly wheel?
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1995 ZR1 #159 Ported,Corsa,4.10 Rear, Dual Disc RAM Clutch, Alum Flywheel, Haibeck Chip, ZFDoc Plates, Relocated Battery 400 rwhp 1992 ZR1 #280 Ported, Locked Secondary's, Flowmaster Exhaust, Haibeck Chip, 375rwhp 1996 Collectors LT4 (Stock) 1972 Convertible 434 Small Block 572 rwhp |
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09-02-2014
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#4 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,180
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Re: Clicking Noise Heard Upon Throttle Stab
Mine has lifter noise also....brand new lifters too on the rebuild too....6K+ miles no issues. Comes and goes seems to be dependent on the weather....BMW had a lifter issue in their N52 engines....
Other possibilities: exhaust leak, chain tensioner(unlikely), Serp belt tensioner...
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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09-02-2014
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#5 |
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Join Date: Mar 2013
Location: Roswell, GA
Posts: 234
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Re: Clicking Noise Heard Upon Throttle Stab
Thanks for the input. Just annoying and I don't want to ignore anything that may get worse.
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1995 ZR1 #159 Ported,Corsa,4.10 Rear, Dual Disc RAM Clutch, Alum Flywheel, Haibeck Chip, ZFDoc Plates, Relocated Battery 400 rwhp 1992 ZR1 #280 Ported, Locked Secondary's, Flowmaster Exhaust, Haibeck Chip, 375rwhp 1996 Collectors LT4 (Stock) 1972 Convertible 434 Small Block 572 rwhp |
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09-02-2014
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#6 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,180
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Re: Clicking Noise Heard Upon Throttle Stab
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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09-02-2014
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#7 |
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Join Date: Mar 2013
Location: Roswell, GA
Posts: 234
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Re: Clicking Noise Heard Upon Throttle Stab
It is similar but not as loud are "heavy". It is more of a light metallic "chirp". I plan on looking into it further but first I need to get it home, it is sitting at a restaurant parking lot with a dead alternator. I knew I had a intermittent issue with the regulator. It would also just stop charging then start back up again. I guess I will rebuild it with ECHLIN parts from NAPA. Need to first see what unit it is 124 or 140 amp. Sounds like the remains don't last long.
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1995 ZR1 #159 Ported,Corsa,4.10 Rear, Dual Disc RAM Clutch, Alum Flywheel, Haibeck Chip, ZFDoc Plates, Relocated Battery 400 rwhp 1992 ZR1 #280 Ported, Locked Secondary's, Flowmaster Exhaust, Haibeck Chip, 375rwhp 1996 Collectors LT4 (Stock) 1972 Convertible 434 Small Block 572 rwhp |
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09-02-2014
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#8 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,180
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Re: Clicking Noise Heard Upon Throttle Stab
Are you sure it wasn't just the alternator and sound echoing.....
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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09-03-2014
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#9 |
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Join Date: May 2007
Location: Addison IL
Posts: 250
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Re: Clicking Noise Heard Upon Throttle Stab
Does the sound have any resemblance to the so called "chain rattle" clicking sound that is sometimes heard at start-up? If so it could be a loose secondary chain tensioner. It should be easy to isolate a tensioner sound to the left or right cylinder bank.
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09-03-2014
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#10 |
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Join Date: Mar 2013
Location: Roswell, GA
Posts: 234
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Re: Clicking Noise Heard Upon Throttle Stab
I recorded the noise with my phone while holding it down near the driver side exhaust manifold while I stab the throttle. I captures pretty much what I am hearing. It is definitely coming from this area of the engine.
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1995 ZR1 #159 Ported,Corsa,4.10 Rear, Dual Disc RAM Clutch, Alum Flywheel, Haibeck Chip, ZFDoc Plates, Relocated Battery 400 rwhp 1992 ZR1 #280 Ported, Locked Secondary's, Flowmaster Exhaust, Haibeck Chip, 375rwhp 1996 Collectors LT4 (Stock) 1972 Convertible 434 Small Block 572 rwhp Last edited by KJL; 09-03-2014 at 05:22 PM. |
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