Quote:
Originally Posted by upallnight
Open loop means it is following a predetermine set of values for the engine and not relying on the 02 sensors to adjust the mixture. If your fuel pressure was at 60 psi and not 50 psi it could be the engine is running too rich at open loop. You will need to actually determine what the fuel pressure is and not rely on the press the schrader valve to determine the fuel pressure in the rail. You need to connect a fuel pressure gauge at the fuel rail and get an actual reading. A lot of info can be determine if you are able to view Live Data. Unable to get live data you might as well load the parts canon and fire away.
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as the fuel pump is not variable voltage...... if it runs fine when warm, shouldnt be fuel pump. &, it is not just a miss, it pops and farts and both rich and lean, intake pop &exhaust pop. and only had small missfire issues before i did coolant crossover. & i did not pull Valvetronics solenoids to do coolant crossover. i have done smoke test and carb cleaner spray test.IDK.
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01Evolve M5 86k silver over black, 02 M5 indi, Dinan, white over caramel 106k. 1991 850i with 66k ttint 72 TA # matching 455HO, with a few tweaks, 06 CCSB 2500 Duramax LBZ with 120 hp efilive tune, 03 CCDRW,LB7 with a 120hp efi live tune 140k. 99 FLHT. 03 FXDWG with 103 in it. 1981 yamaha 850 3cyl. Piped and carbed, cafe in progress. 1997 26' Eliminator eagle, 548 cid BBC built by me. 93mph. Lastly the reason why i am here, 05 x5 4.4. Purchased for pocket change and trailered home.
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11-11-2017, 02:05 PM
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