Engine Loading at Idle D15B Hondata
02-20-2014, 02:10 PM
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Engine Loading at Idle D15B Hondata
Hello everyone,
We have recently installed a JDM D15B (2 Vtec switchovers) head onto a D16Y8 block, using a Z6 intake manifold. The car starts and runs, but for whatever reason we are reading that the engine is (heavily) loaded at idle and low RPMS. We are unable to get the engine to unload.
Some points:
1) When the car is just starting to warm up, the A/F Ratios are maintainable (in the 13:1 range). As soon as it reaches even close to operating temperature, the AFRs become extremely rich (AEM Wideband reads 10:1 which is the lowest it can read).
2) We have tried to decrease the overall fuel significantly yet the 10:1 ratio remains. The 02 sensor does record varying voltages, and it was just thoroughly cleaned. It worked excellent for the last engine (D16Z6) and there is no reason to expect that it is not functioning properly.
We have tried:
Base timing has been set. The Crank Pulley was matched with the 16 degree mark and the Hondata Timing set at 16 degrees with timing light.
Heard that possibly crankcase ventilation issues could cause engine loading, so removed the dipstick to allow ventilation with no improvement.
Adjusted the valve lash to 0.007'' on the intake and 0.009'' on the exhaust. A little hesitant about the 3-stage system and valve lash adjustments as the system operates in 12V operation until either of the selenoids are energized.. So obviously valve lash adjustment was done with the 12V mode set in place.
Removed and inspected PCV valve. It works as it should..
MAP sensor is set properly in Hondata
Been working away at this for a couple days now and I'm getting pretty stumped, and valuable advice would be incredibly appreciated.
Thank you
We have recently installed a JDM D15B (2 Vtec switchovers) head onto a D16Y8 block, using a Z6 intake manifold. The car starts and runs, but for whatever reason we are reading that the engine is (heavily) loaded at idle and low RPMS. We are unable to get the engine to unload.
Some points:
1) When the car is just starting to warm up, the A/F Ratios are maintainable (in the 13:1 range). As soon as it reaches even close to operating temperature, the AFRs become extremely rich (AEM Wideband reads 10:1 which is the lowest it can read).
2) We have tried to decrease the overall fuel significantly yet the 10:1 ratio remains. The 02 sensor does record varying voltages, and it was just thoroughly cleaned. It worked excellent for the last engine (D16Z6) and there is no reason to expect that it is not functioning properly.
We have tried:
Base timing has been set. The Crank Pulley was matched with the 16 degree mark and the Hondata Timing set at 16 degrees with timing light.
Heard that possibly crankcase ventilation issues could cause engine loading, so removed the dipstick to allow ventilation with no improvement.
Adjusted the valve lash to 0.007'' on the intake and 0.009'' on the exhaust. A little hesitant about the 3-stage system and valve lash adjustments as the system operates in 12V operation until either of the selenoids are energized.. So obviously valve lash adjustment was done with the 12V mode set in place.
Removed and inspected PCV valve. It works as it should..
MAP sensor is set properly in Hondata
Been working away at this for a couple days now and I'm getting pretty stumped, and valuable advice would be incredibly appreciated.
Thank you
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