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Twinmags
02-05-2007, 03:19 PM
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, 09:07 PM
could be leaking injectors. how many miles on the car? stock injectors?
Twinmags
02-05-2007, 09:33 PM
They are stock injectors and it only has 28,000 miles.
RICHARD TILL
02-05-2007, 10:40 PM
read the plugs yet?
Twinmags
02-05-2007, 10:59 PM
read the plugs yet?

This might be a stupid question, but what do you by read the plugs?
DaveK
02-05-2007, 11:23 PM
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
jonszr1
02-05-2007, 11:29 PM
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.:thumbsup:
Twinmags
02-06-2007, 11:08 AM
Thanks for all the help guys. I believe the plugs are the cause but I am going to check the rest. Its supposed to get up to 60 degrees today, so the girl and I are going to take Z out for a drink this evening. Thanks again.
ZR1 MK
02-07-2007, 11:14 AM
Popping sound is usually an over rich condition. Probably caused by too much fuel, but can be an electric deficiency such as not burning all fuel.
Injector check would be my first priority. Possible small leak from one to a few.
RICHARD TILL
02-08-2007, 04:22 AM
meaning if you find a wet plug= Bingo, theres the problem.