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DAS_V8

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    09 Cayenne GTS 6MT
    08 E92 BMW M3 6MT
    98 E36 BMW M3

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  1. I thought you had already checked out the fuel system pressures and said they were OK? I checked the low pressure side operation (fuse 13/14 method) and it seemed ok, and high pressure pump seems to be doing its job. Ran another Durametric scan and logged fuel setpoint vs. high pressure value vs. pressure at rail vs. nominal fuel flow rate and the pressure is good at idle (40bar) and seems to hold up to WOT delivery at 120bar but does taper off at times. Flow rate is all over the place and doesn't show a direct correlation with higher setpoint. I'm thinking the problem lies on the low pressure side (maybe fuel regulator?). Going to just do both pumps, filter, regulator and see if that fixes it. Then onto the electrical coil issue.... Happy 4th!
  2. Also a thought I had, I can check voltage and ground easily at the connector, but going back to the root of the problem... based on the firing order, coil 4 shouldn't cause such a hard start issue since its nearly the end of the firing cycle right? Which leads me to thinking its a fuel issue as well. Fuel pumps can start to go "on the fritz" and still somewhat function even by testing with the fuse method to isolate them right? Truck has been rock solid before this issue, just trying to keep from throwing money/parts at it.
  3. First time post... hope to start contributing to the forum now! 09 GTS with 93k and excellent maintenance history, recently getting long cranking times and sometimes rough idle at startup. Starter is working properly so we can rule that out - not sure what to tackle first, coils? fuel pumps? HPFP? Durametric codes: 1023 Ignition Coil D Primary/Secondary circuit - upper limit value exceeded 1026 Fuel high pressure implausible - value below lower limit value The 1023 keeps coming back when cleared but never throws a CEL, the 1026 has been very intermittent but will throw a CEL. I swapped coils 3 and 4 (assuming D is coil 4 and coil 4 is rear-passenger side of engine?) and still get the 1023 code for "D" but no misfire codes. I tried pulling fuses 13 and 14, independently, and truck starts on both fuel pumps (with long crank). Logged with Durametric the fuel setpoint vs. actual pressure and I get 40bar at idle and it seems to keep up OK while driving up to 120bar at WOT. Plugs were changed at 80k but I believe to be on original coils and fuel pumps. So before I start throwing parts at this, any advice on what to troubleshoot next? Still fairly new to the Durametric so anythink I'm missing there with respect to data logging? Cheers, Eric
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