Spark plug wire?
Thread Starter
Instructor
Joined: Jan 2001
Posts: 169
Likes: 0
From: Rock Hill SC
Spark plug wire?
I recently installed a set of long tube headers. I have a Diablosport In-Tune with custom tune. The rev limit should be out of the way but It stops pulling at about 5900 - 6000 rpm. Runs fine and pull strong up to that point then just stops pulling like it hit a rev limit. After the shift, it's back to pulling hard and then the same thing at 5900. Is it possible that I damaged one of those bast#$d plug wires when changing the headers and that would cause this? I would think a damaged wire would cause problems through out the rpms and not just high rpms. What plugs wires are you guys upgrading to on the C7?
Race Director
Joined: Jul 2007
Posts: 10,961
Likes: 2,643
From: Texas Hill Country
we all leave stock wires because there is nothing gained going otherwise, except for looks. if you have a show car that sits around with the hood up then get aftermarket wires. if you drive you car and it has some dirt on it, stick with stock.
Thread Starter
Instructor
Joined: Jan 2001
Posts: 169
Likes: 0
From: Rock Hill SC
Diablosport is looking at the custom tune vs stock tune right now. Removing the plug wires to install the headers was kind of tight and I thought pulling on them may have damaged one. But it does not act like it since it starts, idles and drive fine below 5900.
Drifting
Joined: Sep 2013
Posts: 1,906
Likes: 51
From: Tampa Florida
I kind of had a similar problem I just figured out. I am supercharged and accelerating hard from 2nd through 3rd about 4500/5000 up to 6000 rpm in boost the car started sputtering. But if I was rolling on in a higher gear it did not. Turns out the plug wire on cylinder 8 was not seated. Its funny I did no realize this during normal driving, only hard acceleration above 4500rpm.
The car was having meth kit and exhaust on a few weeks ago, with plugs. I have aftermarket wires on the car for looks, and either the boot slipped off (doubtful because how firm they seat) or when the plugs were changed the plug wire was never fully seated. Once pushed on the car ran great.I guess I was driving around for a few weeks with an arcing plug wire.
The car was having meth kit and exhaust on a few weeks ago, with plugs. I have aftermarket wires on the car for looks, and either the boot slipped off (doubtful because how firm they seat) or when the plugs were changed the plug wire was never fully seated. Once pushed on the car ran great.I guess I was driving around for a few weeks with an arcing plug wire.
Thread Starter
Instructor
Joined: Jan 2001
Posts: 169
Likes: 0
From: Rock Hill SC
I kind of had a similar problem I just figured out. I am supercharged and accelerating hard from 2nd through 3rd about 4500/5000 up to 6000 rpm in boost the car started sputtering. But if I was rolling on in a higher gear it did not. Turns out the plug wire on cylinder 8 was not seated. Its funny I did no realize this during normal driving, only hard acceleration above 4500rpm.
The car was having meth kit and exhaust on a few weeks ago, with plugs. I have aftermarket wires on the car for looks, and either the boot slipped off (doubtful because how firm they seat) or when the plugs were changed the plug wire was never fully seated. Once pushed on the car ran great.I guess I was driving around for a few weeks with an arcing plug wire.
The car was having meth kit and exhaust on a few weeks ago, with plugs. I have aftermarket wires on the car for looks, and either the boot slipped off (doubtful because how firm they seat) or when the plugs were changed the plug wire was never fully seated. Once pushed on the car ran great.I guess I was driving around for a few weeks with an arcing plug wire.
Last edited by typhoon186; Jul 1, 2014 at 01:04 PM.
Melting Slicks
Joined: Jun 2004
Posts: 2,503
Likes: 71
Thanks, maybe that is the case with mine. The boots all feet tight. I don't like those metal boots for some reason. I'm afraid I may have pull a wire loose from inside one of them. Diablosport said it's not the tune or rev limit so I'm going to install a set of MSD 8.5mm wire and see if it changes anything.
Thread Starter
Instructor
Joined: Jan 2001
Posts: 169
Likes: 0
From: Rock Hill SC
Probably no valid reason for not liking the metal boots but they tend to slip off the rubber boot and I just plain don't like the looks of them. But again not much of a valid reason. I did replace them with the MSD 8.5 super conductor wires. Part # 32819. $66.50 at Summit Racing. They claim 50 ohms per foot. The wires are about 6-8 inches long. I checked the resistance and all were 23 - 25.7 ohms. The factory wires were 3,600 to 3,970 ohms.
However, this did not correct my problem of not revving past 5900 rpm. I still think there must be something in the Diablosport tune that is not giving me a higher rev limit. More investigation to do. But my new wires look good.
However, this did not correct my problem of not revving past 5900 rpm. I still think there must be something in the Diablosport tune that is not giving me a higher rev limit. More investigation to do. But my new wires look good.
Last edited by typhoon186; Jul 7, 2014 at 03:36 PM.
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Melting Slicks
Joined: Jun 2012
Posts: 2,226
Likes: 1,029
From: Thomas Texas
If you have HP Tuners, you can set up a scan to log miss fires by cylinders. I was able to determine #8 on a friend's car was causing a flashing CEL light due to the wire not being fully seated.
Oh, another thing...if it is a misfire, the CEL will flash rapidly. If its been tuned, the tuner could have changed the table number of misfires before the CEL starts flashing.
Oh, another thing...if it is a misfire, the CEL will flash rapidly. If its been tuned, the tuner could have changed the table number of misfires before the CEL starts flashing.
Thread Starter
Instructor
Joined: Jan 2001
Posts: 169
Likes: 0
From: Rock Hill SC
If you have HP Tuners, you can set up a scan to log miss fires by cylinders. I was able to determine #8 on a friend's car was causing a flashing CEL light due to the wire not being fully seated.
Oh, another thing...if it is a misfire, the CEL will flash rapidly. If its been tuned, the tuner could have changed the table number of misfires before the CEL starts flashing.
Oh, another thing...if it is a misfire, the CEL will flash rapidly. If its been tuned, the tuner could have changed the table number of misfires before the CEL starts flashing.
Melting Slicks
Joined: Jun 2012
Posts: 2,226
Likes: 1,029
From: Thomas Texas
Log it.
Have you changed anything on the intake side? OI witnessed was a similar situation where the owner had installed a supercharge put a cheap flexible silicone coupling between the air filter and supercharger. At full throttle, the coupling would collapse basically shutting off 90% of the air. We added an aluminum tube inside the coupling and it kept it open and solved the problem.
Have you changed anything on the intake side? OI witnessed was a similar situation where the owner had installed a supercharge put a cheap flexible silicone coupling between the air filter and supercharger. At full throttle, the coupling would collapse basically shutting off 90% of the air. We added an aluminum tube inside the coupling and it kept it open and solved the problem.
Thread Starter
Instructor
Joined: Jan 2001
Posts: 169
Likes: 0
From: Rock Hill SC
Log it.
Have you changed anything on the intake side? OI witnessed was a similar situation where the owner had installed a supercharge put a cheap flexible silicone coupling between the air filter and supercharger. At full throttle, the coupling would collapse basically shutting off 90% of the air. We added an aluminum tube inside the coupling and it kept it open and solved the problem.
Have you changed anything on the intake side? OI witnessed was a similar situation where the owner had installed a supercharge put a cheap flexible silicone coupling between the air filter and supercharger. At full throttle, the coupling would collapse basically shutting off 90% of the air. We added an aluminum tube inside the coupling and it kept it open and solved the problem.
Last edited by typhoon186; Jul 7, 2014 at 03:41 PM.
