Start up - ZR-1 Net Registry Forums

BBBAD94ZR1 · 03-21-2006

I have a odd one here, every now and they when I start my car. Hook opened I can hear the plug arching on the right cylinder head area. I does it for arond 3 seconds and goes away, it does not affect the idle or engine perfomance. My wires are original and the plugs are new split fire triple electrodes. .50 gap. It only does this from what I can see at start up. The car runs fantastic otherwise.
Any ideas other than possilbly are wire going bad.
Your thoughts please.

RAY

tomtom72 · 03-22-2006

I was thinking...I know bad idea...about that sound you hear Ray. It can't be a plug or a wire that is n/g or going bad because it would get worse the longer the motor runs...or at I would think that would happen.

If a plug archs to ground it's not gonna stop and if a wire is leaking voltage that don't stop either. Could the noise from the right side be the secondary vacuum pump? That runs for a bit upon start up to charge the secondary vacuum system and then shuts off...as long as the sys doesn't have any leaks.

Do you think you hear the chains before the oil PSI comes up? I know on my 90 I do but I think the later Z's don't have that noise because of a redesign on the tensioners, I think???

The only other thing I can think of that is on the right side is the alternator and the belt tensioner(serp belt) but I would think that if either made noise due to impending failure the noise would not stop.

Sorry I don't have a better answer to contribute.

Maybe one of the senior guys has a direction to go in for you.

Tom

BBBAD94ZR1 · 03-22-2006

It sounds exactly as if you pulled a wire off when the car is running and it starts to arch.

Ray

tomtom72 · 03-23-2006

Hey Ray

I was thinking about the sound you're hearing and this thought wandered into my mind...Is it possible that you could hear the pintle in the injectors close? I would think that if it's possible for an injector to make a metallic noise from the pintle closing that it might sound like an electrical arc??

Just thought I'd toss that out to see what you think?

Tom

We Gone · 03-23-2006

Start touching plug wires while its running...If you have a leaker you'll find it..

..Or start it up at nite you should see it..can you tell I'm from the old school...Good luck.

BBBAD94ZR1 · 03-23-2006

TRIED THAT AND NOTHIN.
IT DOES NOT DO IT ALL THE TIME.
RAY

03-21-2006	#1
BBBAD94ZR1 Join Date: Nov 2005 Location: NJ Posts: 298	Start up I have a odd one here, every now and they when I start my car. Hook opened I can hear the plug arching on the right cylinder head area. I does it for arond 3 seconds and goes away, it does not affect the idle or engine perfomance. My wires are original and the plugs are new split fire triple electrodes. .50 gap. It only does this from what I can see at start up. The car runs fantastic otherwise. Any ideas other than possilbly are wire going bad. Your thoughts please. RAY

03-22-2006	#2
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,609	Re: Start up I was thinking...I know bad idea...about that sound you hear Ray. It can't be a plug or a wire that is n/g or going bad because it would get worse the longer the motor runs...or at I would think that would happen. If a plug archs to ground it's not gonna stop and if a wire is leaking voltage that don't stop either. Could the noise from the right side be the secondary vacuum pump? That runs for a bit upon start up to charge the secondary vacuum system and then shuts off...as long as the sys doesn't have any leaks. Do you think you hear the chains before the oil PSI comes up? I know on my 90 I do but I think the later Z's don't have that noise because of a redesign on the tensioners, I think??? The only other thing I can think of that is on the right side is the alternator and the belt tensioner(serp belt) but I would think that if either made noise due to impending failure the noise would not stop. Sorry I don't have a better answer to contribute. Maybe one of the senior guys has a direction to go in for you. Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

03-22-2006	#3
BBBAD94ZR1 Join Date: Nov 2005 Location: NJ Posts: 298	Re: Start up It sounds exactly as if you pulled a wire off when the car is running and it starts to arch. Ray

03-23-2006	#4
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,609	Re: Start up Hey Ray I was thinking about the sound you're hearing and this thought wandered into my mind...Is it possible that you could hear the pintle in the injectors close? I would think that if it's possible for an injector to make a metallic noise from the pintle closing that it might sound like an electrical arc?? Just thought I'd toss that out to see what you think? Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

03-23-2006	#5
We Gone Join Date: Apr 2004 Location: Atlanta, GA Posts: 2,169	Re: Start up Start touching plug wires while its running...If you have a leaker you'll find it.. ..Or start it up at nite you should see it..can you tell I'm from the old school...Good luck. __________________ Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold

03-23-2006	#6
BBBAD94ZR1 Join Date: Nov 2005 Location: NJ Posts: 298	Re: Start up TRIED THAT AND NOTHIN. IT DOES NOT DO IT ALL THE TIME. RAY