Exhaust popping update....
Thread Starter
Race Director
Joined: Apr 2000
Posts: 11,840
Likes: 0
From: Galloway NJ
Exhaust popping update....
When the #2 cylinder spark plug wire is disconnected the pop goes away...
what the hell does that mean??
I haven't tried changing out spark plugs or anything yet, won't have time to play around with it til tomorrow...
what the hell does that mean??
I haven't tried changing out spark plugs or anything yet, won't have time to play around with it til tomorrow...
Safety Car
Joined: Jun 2001
Posts: 4,004
Likes: 2
From: Severna Park Md
Re: Exhaust popping update.... (Metal Wulf)
That could mean that #2 is the one that is firing out of time due to cross fire in the cap. so what cylinders are closest to #2 in the cap? Lets see...the firing order goes 18436572. So I would say maybe a bad plug or wire in either #7 or #1 since those are the ones that are next to #2 in the cap. so when the charge for 1 or 7 can make ground thru the plug for whatever reason, that charge will find the next closest path to ground. So it could be jumping to post #2 in the cap. #2 fires out of time with the exhaust valve open and POP!!!
Melting Slicks
Joined: Jun 2001
Posts: 2,429
Likes: 14
From: CA
Re: Exhaust popping update.... (Jvette73)
Jevette 73 - Good reasoning, but how can you get a fire on a cyl that was just lit? It could be a weak spark or bad plug on that cyl #2 too (not getting full burn) which would back up your theory.
One thing you could check is for a vac leak. My other car use to pop like crazy in gear going down a hill. I found a small vac line disconnected. Hooked it up, no more popping. Another thing that will cause popping is a bad diverter valve on your A.I.R. system. (if you still have the smog hooked up)An easy check on this is to look at the rubber hose that goes into the exhaust manifold from the smog pump. If it's dried out or burnt looking, the valve is bad.
If you still have the problem, do a compression test. The #2 cyl may have a bad exhaust valve - hope not :(
One thing you could check is for a vac leak. My other car use to pop like crazy in gear going down a hill. I found a small vac line disconnected. Hooked it up, no more popping. Another thing that will cause popping is a bad diverter valve on your A.I.R. system. (if you still have the smog hooked up)An easy check on this is to look at the rubber hose that goes into the exhaust manifold from the smog pump. If it's dried out or burnt looking, the valve is bad.
If you still have the problem, do a compression test. The #2 cyl may have a bad exhaust valve - hope not :(
Thread Starter
Race Director
Joined: Apr 2000
Posts: 11,840
Likes: 0
From: Galloway NJ
Re: Exhaust popping update.... (71coupe)
thanks guys, I'll be playing with it tomorrow, changing out plugs and simple crap like that.
i'll post an update, if I figure anything out...
i'll post an update, if I figure anything out...
Safety Car
Joined: Jun 2001
Posts: 4,004
Likes: 2
From: Severna Park Md
Re: Exhaust popping update.... (71coupe)
71coupe, good point on the posibilty of burnt exhaust valve in #2.
I can personaly attest to the fact that unburnt gasses in the exhause will cause a pop when a plug fires out of time. I traced this exact problem with now cure. My bro came over one day and listened to it. He explained to me the situation as I have repeated. When I changed the plugs the problem was solved. I had one bad plug that would not let the charge ground. So it jumped posts to the adjacent cylinder in cap order and fired that one out of time causing the popping.
I can personaly attest to the fact that unburnt gasses in the exhause will cause a pop when a plug fires out of time. I traced this exact problem with now cure. My bro came over one day and listened to it. He explained to me the situation as I have repeated. When I changed the plugs the problem was solved. I had one bad plug that would not let the charge ground. So it jumped posts to the adjacent cylinder in cap order and fired that one out of time causing the popping.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Race Director
Joined: Apr 2000
Posts: 11,840
Likes: 0
From: Galloway NJ
Re: Exhaust popping update.... (Jvette73)
:cheers: I think she should run a bit better now considering you had to be running on 6 instead of 8 with two wire crossed. :cheers:
need to do a little tuning and she'll be running a lot better :yesnod:
to bad it's raining, and isn't suppose to let up til next saturday!!
thanks for the help :seeya