misfire
Le Mans Master
Joined: Nov 2005
Posts: 6,993
Likes: 25
ok here we go again, rented noid light and bought stethescope. all injectors are recieving power... light flashing. not much change in how engine ran while switching from one injector to the next. all injectors sound like there opening... clicking sound thru scope, all sound very similar.
Le Mans Master
Joined: Nov 2005
Posts: 6,993
Likes: 25
Yes.
Something doesn't make sense here; you're seeing cold exhaust off of bank two at the tailpipes and normal at bank one. But when you measure temps at the headers your seeing cold temps on the forward headers on both banks and normal temps the the rear headers on both banks... That makes absolutely no sense...
I would start by rechecking your temps. Measure the temperature at the tails, then measure the temperature at the cats then measure the temp at the pup-cats (if you have them) then measure the temp at the headers... Let your car heat up to operating temperature.
Also, did you ever verify that your right tails are blowing cold air instead of sucking air per post 16?
Something doesn't make sense here; you're seeing cold exhaust off of bank two at the tailpipes and normal at bank one. But when you measure temps at the headers your seeing cold temps on the forward headers on both banks and normal temps the the rear headers on both banks... That makes absolutely no sense...
I would start by rechecking your temps. Measure the temperature at the tails, then measure the temperature at the cats then measure the temp at the pup-cats (if you have them) then measure the temp at the headers... Let your car heat up to operating temperature.
Also, did you ever verify that your right tails are blowing cold air instead of sucking air per post 16?
Thread Starter
Heel & Toe
Joined: Sep 2011
Posts: 22
Likes: 0
From: lockport il
the front two on each side are colder by approx. 150 to 200 degrees. previously checked for spark at coil packs the old fashion way, pulled wires on at a time, blue spark came from all coil packs. new wires and new plugs.
Last edited by jacksbadvert; Sep 29, 2011 at 03:13 PM.
Tech Contributor
Joined: Aug 2008
Posts: 2,902
Likes: 21
From: Oak Hill Virginia
which is what I repeated in my post... That scenario doesn't make any sense to me.
Last edited by cdkcorvette7; Sep 29, 2011 at 03:32 PM.
Tech Contributor
Joined: Aug 2008
Posts: 2,902
Likes: 21
From: Oak Hill Virginia
Someone correct me if I'm wrong but I thought a tailpipe sucking air was indicative of an exhaust valve hung open. OP, did this just start happening all of the sudden for no reason? Did you over-rev the motor at the track recently?
Last edited by cdkcorvette7; Sep 29, 2011 at 03:35 PM.
Thread Starter
Heel & Toe
Joined: Sep 2011
Posts: 22
Likes: 0
From: lockport il
yes one tail sucking one blowing on each muffler. started about 15 miles after fueling,only twenty bucks worth, which is why i changed fuel filter and pressure reg, same thing i know, thought maybe bad gas. that gas went very quickly four gallons in twenty miles give or take, though a lot of idleing in garage trying to figure out whats wrong. added 5 gal. of shell gas since.
and no over reving, never been to track, just play on street. but positively has not been over red line
and no over reving, never been to track, just play on street. but positively has not been over red line
Tech Contributor
Joined: Aug 2008
Posts: 2,902
Likes: 21
From: Oak Hill Virginia
I don't get that. Per the diagram below the split happens waaay back in the exhaust system. Both tails on a given side should be doing exactly the same thing unless you have a partially clogged muffler... Time for me to get out of here and let someone far more experienced help you.
Last edited by cdkcorvette7; Sep 29, 2011 at 03:57 PM.
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Thread Starter
Heel & Toe
Joined: Sep 2011
Posts: 22
Likes: 0
From: lockport il
thank you for the ideas of what to check. I appreciate all of yours and every one else's input. It might be time to put her away and save up for a speed shop. anybody know a good shop around the lockport/ homer glen area that does tuning and repair?
Last edited by jacksbadvert; Sep 29, 2011 at 04:08 PM.
Tech Contributor
Joined: Aug 2008
Posts: 2,902
Likes: 21
From: Oak Hill Virginia
I found this thread if you do decide to take it in: http://forums.corvetteforum.com/c6-s...go-wanted.html
Burning Brakes
Joined: Mar 2008
Posts: 983
Likes: 36
From: Middle Of Kali CA
Man this is getting hard to follow.
If four of eight cylinders are firing properly and the BAD 4 are getting fuel AND spark as you have said, Compresion is all that is left.
Any top end, valve train noise?
I find it hard to swallow that you would loose 4 holes due to valve springs at once.
Leak down test?
If four of eight cylinders are firing properly and the BAD 4 are getting fuel AND spark as you have said, Compresion is all that is left.
Any top end, valve train noise?
I find it hard to swallow that you would loose 4 holes due to valve springs at once.
Leak down test?
Thread Starter
Heel & Toe
Joined: Sep 2011
Posts: 22
Likes: 0
From: lockport il
if computer went bad im guessing that could throw off timing causing misfires and effect temp at header tubes. going to straightline performance next fri to find out. I'll post whatever i find out.
Thanks again for everyone's help
Thanks again for everyone's help
