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Old March 28th, 2008, 13:35   #1
EnthymematisHabilis
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Join Date: Feb 2008
Location: Lincoln, NE
Fuel Economy: 43mpg
Default Power loss, DTC 17656/P1248

Hi, I have a 2000 1.9L ALH TDI Jetta 5sp and I've been having intermittent power loss (particularly on long hills with cruise on, sometimes the power will "pulse" ie. power-no power-power-no power etc but usually just drops off) and the MIL has come on. I can sometimes maintain speed by pulsing the throttle. The DTC reads as P1248/ 17656 - "Injection Start Control Deviation". I've also noticed air bubbles in the fuel line between the fuel filter and the injection pump. If you can help with any suggestions as to what the problem might be or where to look for the problem that would be great.

So far, prior to determining the DTC pointing to the fuel system, I've replaced the MAF, checked/cleaned the intake and turbo (and inadvertently messed up the impeller balance, apparently, as the turbo shook itself into the housing and destroyed the compressor and bushings two days ago) and replaced the N75 solenoid. At least now I definitely know the turbo needs to be replaced, too. (By chance, anyone have a good VNT15 or VNT17 lying around?)

thanks, David
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