update on high RPM missing problem
Thread Starter
Le Mans Master
Joined: Apr 2004
Posts: 7,106
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From: Newark DE
update on high RPM missing problem
got my NGK B4 non-resistor plugs today and put them in.
Just got back from a test drive and was able to get in a couple nice high speed/high RPM runs.
took her up to redline (6500) in 1st, 2nd, and 3rd gears and up to about 4000rpm in 4th on each run and couldn't hear nor feel any missing at all while previously it was VERY obvious starting at around 4,000rpm or so.
It was a good friend that recommended I swap my R45's for the non-resistor plugs as he had a similar problem a while back himself and after going thru everything imaginable he switched to a non-resistor plug and it cured his missing problem.
his theory on this is that the original plugs were non-resistor plugs but the current plugs of the R45's are resistor plugs and that the resistor could be causing just enough of a voltage drop to cause the mis-firing.
I was running R45's previous to the new ones I had just installed in Jan without a problem but in Jan I had also installed new ignition wires. Perhaps it was the combination of the new wires with the resistor plugs that caused the problem? I have NO idea!
Made a bit of sense to me so I tried it out as the first item on my list of parts to go through on my checklist to try to solve the problem and it seemed to have worked.
I'll give it a few more days of driving the car to make sure the missing doesn't come back before I reistall all the shielding pieces but so far the missing has disappeared.
Just got back from a test drive and was able to get in a couple nice high speed/high RPM runs.
took her up to redline (6500) in 1st, 2nd, and 3rd gears and up to about 4000rpm in 4th on each run and couldn't hear nor feel any missing at all while previously it was VERY obvious starting at around 4,000rpm or so.
It was a good friend that recommended I swap my R45's for the non-resistor plugs as he had a similar problem a while back himself and after going thru everything imaginable he switched to a non-resistor plug and it cured his missing problem.
his theory on this is that the original plugs were non-resistor plugs but the current plugs of the R45's are resistor plugs and that the resistor could be causing just enough of a voltage drop to cause the mis-firing.
I was running R45's previous to the new ones I had just installed in Jan without a problem but in Jan I had also installed new ignition wires. Perhaps it was the combination of the new wires with the resistor plugs that caused the problem? I have NO idea!
Made a bit of sense to me so I tried it out as the first item on my list of parts to go through on my checklist to try to solve the problem and it seemed to have worked.
I'll give it a few more days of driving the car to make sure the missing doesn't come back before I reistall all the shielding pieces but so far the missing has disappeared.
Last edited by BarryK; Jun 20, 2006 at 06:21 PM.
