WOT 2-3 shift pinging
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Senior Member
Joined: May 2003
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From: San Marcos
WOT 2-3 shift pinging
I intermitantly have minor detonation directly after the wot 2-3 shift. Everything was fine on the dyno. I'm running a 6# lower with a custom tune. My tuner said it was the parameters in the tq management. He made some adjustments and it went away for a while. The fuel filter is new as are the plugs. I also tried different brands of gas. Not long ago I noticed the same problem during the wot 1-2. Everything seems fine today.
About this same time my driver side cat was going out and was just recently replaced. The inside was broken up and rattleing. Is the bad cat and my shift problem related or just a coincidence?
About this same time my driver side cat was going out and was just recently replaced. The inside was broken up and rattleing. Is the bad cat and my shift problem related or just a coincidence?
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Joined: Jul 2005
Posts: 58
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From: Edmonton
Pinging
What plugs are you running?
What gap?
What are your MAF voltage readings?
With a 6# I run BR7EF plugs gapped to .035.
My MAF voltage peaked at 4.8 so I have a MAFia, haven't installed it yet as my L is not going anywhere until spring.
I also had no problems on the dyno but the truck pinged on the street even at part throttle. This was with the old Diablo sport pulley tune that had too much timing. The new 91 octane pulley tune resolved those problems but I still had spark blow out at WOT on downshifts. When I changed plugs from TR7IX to the BR7EF's I noticed the Mechanic had gapped the TR7's to .052. I installed the BR7EF's myself and have had no problems with spark blow out. I still need to install the MAFia and get a new tune.
What gap?
What are your MAF voltage readings?
With a 6# I run BR7EF plugs gapped to .035.
My MAF voltage peaked at 4.8 so I have a MAFia, haven't installed it yet as my L is not going anywhere until spring.
I also had no problems on the dyno but the truck pinged on the street even at part throttle. This was with the old Diablo sport pulley tune that had too much timing. The new 91 octane pulley tune resolved those problems but I still had spark blow out at WOT on downshifts. When I changed plugs from TR7IX to the BR7EF's I noticed the Mechanic had gapped the TR7's to .052. I installed the BR7EF's myself and have had no problems with spark blow out. I still need to install the MAFia and get a new tune.
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Senior Member
Joined: May 2003
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From: San Marcos
BR7Ef @ .035 and running 14psi on the non ported Eaton.
MAF counts was in the mid 960's. in 55 deg weather.
I know it's not related to the bad cat either. A change was recently made to a spark adder table that had been overlooked and left at stock settings. Seemed to help a bit.
I will have to log the MAF counts, but temps don't make a difference. Anywhere between 60-80 degrees and it still happens. So I suspect the MAF isn't being maxed out. I'm in southern CA, so cold temps are non existant, but bad gas is. I have also pulled timing/added fuel with my SCT which didn't make a difference.
Where should I be looking in the tune to possibly remedy this. Could tq management parameters be off?
MAF counts was in the mid 960's. in 55 deg weather.
I know it's not related to the bad cat either. A change was recently made to a spark adder table that had been overlooked and left at stock settings. Seemed to help a bit.
I will have to log the MAF counts, but temps don't make a difference. Anywhere between 60-80 degrees and it still happens. So I suspect the MAF isn't being maxed out. I'm in southern CA, so cold temps are non existant, but bad gas is. I have also pulled timing/added fuel with my SCT which didn't make a difference.
Where should I be looking in the tune to possibly remedy this. Could tq management parameters be off?
Last edited by RGCBSHRTY#1; Dec 10, 2006 at 11:54 PM.