High end miss
Thread Starter
Team Owner
Joined: Apr 2001
Posts: 22,267
Likes: 3
From: Dallas TX
High end miss
I've got a slight high end miss... above 4500 or so. I revved it up to check that the vibrations were gone, and they are. But there was definitely a miss all over above 4500. I could hear it. Didn't pick up any knock when it missed, so am I to assume it's not detonation? I have new MSD wires, a new optispark, and a high performance coil. Any ideas?
Thread Starter
Team Owner
Joined: Apr 2001
Posts: 22,267
Likes: 3
From: Dallas TX
Re: (scorp508)
oh.. yes, they are semi-new ... NGK TR55's .. put then in in July... they have about 2k miles on them. I suppose I could go ahead and change them... you recommend going to the TR6 (cooler) because of my compression?
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: High end miss (Glock'94)
Is it running out of gas? Try it with a fuel pressure guage hooked up. If the pressure drops off at high rpms, check the filter. Possibly the pump is too weak to maintain pressure at hige volumes. Just a shot in the dark. Good luck.
Melting Slicks
Joined: Aug 2001
Posts: 2,047
Likes: 0
Re: High end miss (Glock'94)
Very well could be bad wire... I do see they are new, but, run the car in complete darkness.. by the way, well ventilated darkness, and look carefully in the motor compartment.. You may be surprised! Arcing? :yesnod:
Former Vendor
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
Re: High end miss (CFI-EFI)
CFI_EFI,
No problem. I did not realize it did that. And for the resolution, forget that. I changed mine to a smaller setting last week and it allows you to get more on your screen too. Did not realize I was the cause of the super dooper screen! :lol: You see you learn more here than just about cars. Thanks amd sorry if I was the cause of your carpal tunnel syndrome. :lol:
[Modified by ski_dwn_it, 9:47 PM 3/8/2002]
No problem. I did not realize it did that. And for the resolution, forget that. I changed mine to a smaller setting last week and it allows you to get more on your screen too. Did not realize I was the cause of the super dooper screen! :lol: You see you learn more here than just about cars. Thanks amd sorry if I was the cause of your carpal tunnel syndrome. :lol:
[Modified by ski_dwn_it, 9:47 PM 3/8/2002]
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Thread Starter
Team Owner
Joined: Apr 2001
Posts: 22,267
Likes: 3
From: Dallas TX
Re: High end miss (CFI-EFI)
Is it running out of gas? Try it with a fuel pressure guage hooked up. If the pressure drops off at high rpms, check the filter. Possibly the pump is too weak to maintain pressure at hige volumes. Just a shot in the dark. Good luck.
Safety Car
Joined: Jun 1999
Posts: 3,570
Likes: 3
From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
Re: High end miss (Glock'94)
If you are sure its a miss, thoroughly check the ignition wires.
New wires do not guarantee you don't have a problem. It could be a wire leaking to ground or cross fire to another wire. Do the check in the dark garage. Check all connections, make sure you used the silicone grease, wire separators, and plastic insulators especially on the wire from the coil to the Optispark. Make sure the gaps are right on the plugs.
New wires do not guarantee you don't have a problem. It could be a wire leaking to ground or cross fire to another wire. Do the check in the dark garage. Check all connections, make sure you used the silicone grease, wire separators, and plastic insulators especially on the wire from the coil to the Optispark. Make sure the gaps are right on the plugs.
Former Vendor
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
Re: High end miss (Mez)
I will also second MEZ suggestion about wires. I spent 75 bucks for a set and they had a small pinhole in the one wire. All of a sudden the car had NO power, couldn't even pass a grandma in an oldsmobile! Got to my Dads and started looking around after he gave me a lecture on why I should not mess with stuff like this, meanwhile he has a whole fleet of muscle cars that are hopped to all hell. Anyways I started moving wires around while the car was idling and I got about knocked on my butt. Dad said he saw sparks fly off my one fingers to the SR! I kept poking around (not grounding myself as good and only received static type shocks till I pinpointed the hole. After getting some electric tape on the hole the car ran like a champ again. I surely would be able to take that old grandma now! :yesnod: Shes probably still telling stories to her card club! As stated before do not rule out the wires. How are the BLMs? You may be running super rich. Glock, thought I would also rub in that I ordered my WB o2 sensor the other day! The only way to tune! Puts your mind at ease when doing WOT and also tuning for mileage. I will be watching to see if you find out what it is.
-jesse
-jesse