peterdiesel
Member
I am having a problem with my 2002 Jetta automatic TDI that hopefully someone can help me with. I recently chipped the ECM with Upsolute Stage 2 and upgraded the nozzels to 184 um (was 157um). When running down the highway at about 60mph, I floored the accelerator. The trany downshifted, the rpm's went to 3500, after a few seconds I had severe shudder. I chopped the throttle, the shutter stopped, but the engine was running lumpy with reduced power and quite a bit of smoke. I hooked up Vag-com, got a misfire on cylinder #3. This coincidently occurred with my first tank of 15 ppm. I now have a rough idle, blue smoke (unburned diesel) and shutter at 1500-2000 RPM under light/medium load (OK under heavy acceleration), intermittant misfires on three cylinders.
I have replaced EGR valve, checked MAF, checked MAP, cleaned snow screen, pop tested and balanced injectors, checked compression. Last night I ran a tdi-timing graph (attached). I noticed that the timing is on the retarded side of optimal (below the blue line). Could I have slipped a tooth on the timing belt? This may have had something to do with the catastrophic event that occured. The timing belt, tensioner and water pump was changed 3K miles ago by a VW dealer. If I advance the injection timing with VAG-COM to 7 degrees BTDC (out of spec.), the idle smoothes out and the smoke is reduced. If this is the case, is there an easy way to check the timing belt alignment without major disassembly?
I have replaced EGR valve, checked MAF, checked MAP, cleaned snow screen, pop tested and balanced injectors, checked compression. Last night I ran a tdi-timing graph (attached). I noticed that the timing is on the retarded side of optimal (below the blue line). Could I have slipped a tooth on the timing belt? This may have had something to do with the catastrophic event that occured. The timing belt, tensioner and water pump was changed 3K miles ago by a VW dealer. If I advance the injection timing with VAG-COM to 7 degrees BTDC (out of spec.), the idle smoothes out and the smoke is reduced. If this is the case, is there an easy way to check the timing belt alignment without major disassembly?
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