Popping Sound - ZR-1 Net Registry Forums

Twinmags · 02-05-2007

My '91 Z has a popping sound coming out of the exhaust at idle. I don't have a service manual so I was wondering if anyone could help me out? It is a slight sound and only occurs when engine is warmed up. I am not showing any codes and everything works. It seems as if it is only performing at about 95%. I'd appreciate any help.

Kevin · 02-05-2007

could be leaking injectors. how many miles on the car? stock injectors?

Twinmags · 02-05-2007

They are stock injectors and it only has 28,000 miles.

RICHARD TILL · 02-05-2007

read the plugs yet?

Twinmags · 02-05-2007

Quote:

Originally Posted by RICHARD TILL

read the plugs yet?

This might be a stupid question, but what do you by read the plugs?

jonszr1 · 02-05-2007

Reading the plugs will give you an Idea of the fuel mixture. what you dont want to see is litle dark specs on the porcelin . that means its detonating . those little specs are little bit of piston. Don't worry to much it sound scarier than it is . Ck your fuel pressure to see if its within spec when you floor it . You can get a gauge with a long enough hose and tape it to the windshield. go find a safe place to get on it have a buddy sit in the passenger seat and read the gauge. i believe it should be between48-55 lbs, but check your manual to be sure. hope that helps.

DaveK · 02-05-2007

He means have you pulled the spark plugs to see if any is showing signs of fouling etc. which could indicate a cylinder wasn't firing properly or something like that. There's a good explanation here -

http://www.nightrider.com/biketech/spkplghnbook.htm#We

02-05-2007	#1
Twinmags Join Date: Feb 2006 Location: Tulsa, OK Posts: 8	Popping Sound My '91 Z has a popping sound coming out of the exhaust at idle. I don't have a service manual so I was wondering if anyone could help me out? It is a slight sound and only occurs when engine is warmed up. I am not showing any codes and everything works. It seems as if it is only performing at about 95%. I'd appreciate any help. __________________ All cars, none a trailer queen.

02-05-2007	#2
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,632	Re: Popping Sound could be leaking injectors. how many miles on the car? stock injectors? __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

02-05-2007	#3
Twinmags Join Date: Feb 2006 Location: Tulsa, OK Posts: 8	Re: Popping Sound They are stock injectors and it only has 28,000 miles. __________________ All cars, none a trailer queen.

02-05-2007	#4
RICHARD TILL Join Date: Aug 2005 Location: Iuka, Mississippi 38852 Posts: 756	Re: Popping Sound read the plugs yet?

02-05-2007	#6
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: Popping Sound Reading the plugs will give you an Idea of the fuel mixture. what you dont want to see is litle dark specs on the porcelin . that means its detonating . those little specs are little bit of piston. Don't worry to much it sound scarier than it is . Ck your fuel pressure to see if its within spec when you floor it . You can get a gauge with a long enough hose and tape it to the windshield. go find a safe place to get on it have a buddy sit in the passenger seat and read the gauge. i believe it should be between48-55 lbs, but check your manual to be sure. hope that helps.

02-05-2007	#7
DaveK Join Date: Jul 2004 Location: Sudbury, Ontario. Canada Posts: 1,540	Re: Popping Sound He means have you pulled the spark plugs to see if any is showing signs of fouling etc. which could indicate a cylinder wasn't firing properly or something like that. There's a good explanation here - http://www.nightrider.com/biketech/spkplghnbook.htm#We __________________ 1991 #1516 Black/Black davidmkelly.com Author of fast-paced, sci-fi thrillers.