Car Missing
Thread Starter
Instructor
Joined: Dec 2010
Posts: 134
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Car Missing
My car has recently started mission a few months after my AA install. Not so much at idle mainly at higher RPM's and it does not do it all the time. I installed new MSD plug wires when I put the SC in. Also put in Kooks headers. Could it be heat? It is not throwing any codes either. I will pull the plugs and wires and reinstall my stock wires and see if that helps. Any other ideas?
Dave
Dave
Team Owner
Joined: May 2006
Posts: 21,473
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From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
(1) Ohm each plug wire and record the readings!
(2) Check each coil connection for moisture and corrosion
(3) Check each wire at the tips for moisture and corrosion
(4) Check each wire by bending it to see if there are cracks and or leakage areas
(5) Thuroughly inspect plugs and record any disclolration, wetness, check tips both ends etc
(6) Inspect and check gap on the plugs, make sure no electrodes are bent missing etc
Which spark plugs are you running and what are they currently gapped at?
Let us know what you find and make sure you LABE each plug out of which cylinder it came!
Thanks,matt
(2) Check each coil connection for moisture and corrosion
(3) Check each wire at the tips for moisture and corrosion
(4) Check each wire by bending it to see if there are cracks and or leakage areas
(5) Thuroughly inspect plugs and record any disclolration, wetness, check tips both ends etc
(6) Inspect and check gap on the plugs, make sure no electrodes are bent missing etc
Which spark plugs are you running and what are they currently gapped at?
Let us know what you find and make sure you LABE each plug out of which cylinder it came!
Thanks,matt
Burning Brakes
Joined: Feb 2004
Posts: 1,130
Likes: 0
From: Camarillo/Oxnard CA
Put those MSD wires in the trash, buy GM Red Hot wires and never look back. I've had the best results using the GM red hots and use the stock metal boot to protect them from heat.
Just had a H/C LS2 Vette last week with a random misfire under during WOT and it was the MSD wires. I've seen it happen several times.
Just had a H/C LS2 Vette last week with a random misfire under during WOT and it was the MSD wires. I've seen it happen several times.
Melting Slicks
Joined: Jun 2001
Posts: 2,340
Likes: 2
From: Moro IL
Most good scan tools can pull up a missfire history on GM's, even if they are minor enough not to set a code. If you have access to one, check and see the missfire history per individual cylinders. If it's just one cylinder doing it, then swap the coil, wire , and plug with other cylinders (all different). Clear the missfire history and drive it again, see if the missfire moved to another cylinder, if it did, see if it was the one you moved one of the components from the original missfire cylinder to. For example if you had a missfie history on #3, move your coil to #2, your wire to #4, and your plug to #5. If the missfire count comes back and changed to #4, then you had a bad wire. If the missfire stays on #3, well you eliminated all those components fom the possible cause of your problem and will have to look deeper into #3.
Patrick
Patrick
Safety Car
Joined: Jan 2008
Posts: 4,797
Likes: 52
From: Boise
Put those MSD wires in the trash, buy GM Red Hot wires and never look back. I've had the best results using the GM red hots and use the stock metal boot to protect them from heat.
Just had a H/C LS2 Vette last week with a random misfire under during WOT and it was the MSD wires. I've seen it happen several times.
Just had a H/C LS2 Vette last week with a random misfire under during WOT and it was the MSD wires. I've seen it happen several times.
Go make sure all your plug wires are pushed on tight to both the coils and the plugs. I had a plug wire that didn't double click onto one of my coils once and it causes a miss at partial throttle, took me FOREVER to figure that out
Thread Starter
Instructor
Joined: Dec 2010
Posts: 134
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That is what i was thinking. I am going to start my putting the stock wires back on it and see if that will fix it. While I'm at it I will pull the plugs and regap to .032. I am running the NGK plugs and theyare gapped .035. Not sure if there is a difference with .003??? Thats what people have been telling me though. Thanks for all the input.
Safety Car
Joined: Jan 2008
Posts: 4,797
Likes: 52
From: Boise
I had the GM "red" performance wires and now have the MSD's and the MSD's seem to have way better construction in my non-professional opinion
I'd be surprised if you were blowing out spark @ that gap
I'd be surprised if you were blowing out spark @ that gap
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From: cookeville tennessee
(1) Ohm each plug wire and record the readings!
(2) Check each coil connection for moisture and corrosion
(3) Check each wire at the tips for moisture and corrosion
(4) Check each wire by bending it to see if there are cracks and or leakage areas
(5) Thuroughly inspect plugs and record any disclolration, wetness, check tips both ends etc
(6) Inspect and check gap on the plugs, make sure no electrodes are bent missing etc
Which spark plugs are you running and what are they currently gapped at?
Let us know what you find and make sure you LABE each plug out of which cylinder it came!
Thanks,matt
(2) Check each coil connection for moisture and corrosion
(3) Check each wire at the tips for moisture and corrosion
(4) Check each wire by bending it to see if there are cracks and or leakage areas
(5) Thuroughly inspect plugs and record any disclolration, wetness, check tips both ends etc
(6) Inspect and check gap on the plugs, make sure no electrodes are bent missing etc
Which spark plugs are you running and what are they currently gapped at?
Let us know what you find and make sure you LABE each plug out of which cylinder it came!
Thanks,matt
Thread Starter
Instructor
Joined: Dec 2010
Posts: 134
Likes: 0
Thread Starter
Instructor
Joined: Dec 2010
Posts: 134
Likes: 0
Found a bad wire, header burned it up. Pulled all the MSD wires, reinstalled stock wires with heat shield, and re-gapped all plugs. Car is running strong now. Thanks to all for your input. Thought it was something easy. Now time to upgrade valve train!