LS6 4L60e 1948 Ford Pickup LTFTs 25+ @ Idle

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Stock LS6 bolted to 4L60e. 90 mm Edelbrock throttle body (came with the wiring harness/PCM setup). New MAP and MAF. New Vette front O2s. Thoroughly checked for vacuum leaks - all corrected. At and near idle LTFTs are +25. I watched stfts and they scale up the LTFTs. Both sides are +25 @ idle. Off idle cleans up. Pull the MAF plug and RPM jumps to around 1700-1800 RPM. Both sides settle down to +8 LTFT with MAF unplugged.

Attached are scans of first drive and pulling the MAF plug (also pulled brake booster vacuum line, and then reattached, early in MAF plug scan) and current tune.

The O2s are 1 1/ 2- 2 feet downstream from the exhaust ports. Are the O2s lazy due to inadequate heat??

***There are idle air problems with the 90mm Edelbrock - I'll replace it with a stock Camaro TB.

Any other ideas??

TIA.



joel

Log_0013 pulled maf connector.efi Waynes Truck_0007.ctz Log_0013 FIRST DRIVE.efi