Josh_WA
Veteran Member
- Joined
- May 8, 2015
- Location
- Mountlake Terrace WA
- TDI
- 2014 Jetta TDI, 1993 Eurovan Weekender TDI(AHU) converted 2/2016, 93 Eurovan MV TDI(1z)(sold!)
I've had my AHU (160K miles) swapped into my 93 Eurovan weekender for a few years now. I've always had what seems like excessive vibration at idle. It shakes the van through the floor, stick, steering wheel, doors, everything. Once underway, everything is great vibration wise and drives great. Pretty much once I get above 1000 rpm. I've just lived with it for the most part, after trying a number of changes to try and relieve the vibes, and since this was the first diesel engine I've owned. Late last year I built another TDI Eurovan, but with a 1Z (326K miles) and it didn't nearly have the same amount of shake at idle as my weekender. The 2nd van was built with little/less replacement of existing parts to the engine or mounts, so this has brought me back to seeing if I can figure out what I've got that needs replacement or adjustment on my current. The van builds are in my signature. Here's some things I've already looked at or replaced.
Mounts are all new
Single mass flywheel with no changes whether clutch in or out
I don't see any air in the fuel lines
Fuel filter is new
Harmonic balancer is new
I don't see any wobble or shake with any of belts or rotating shafts
The engine is not contacting the body/frame/firewall
Compression is 400, 420, 420, 400 on letting it turn over 5-6 times
I went from stock injectors with 170K to Bosio DLC 520 injector with no changes in vibration (power at the pedal went up though!)
K03 Turbo is new, but only because the original was leaking.
Injection pump doesn't appear to have ever been serviced, but the van starts instantly, and the IP is not leaking.
VCDS-
Timing is dead on the middle line, but jumps up and down to the next upper and lower line interval
IQ is 3.4, but theres not much change if I move it up to 3.8 or down to 2.6.
Injector values are 0.14, -0.21, 0.12 (bosio DLC 520)
So I'm open to any advise to help remedy some vibrations. Or if someone knows a trusted mechanic in the North Seattle area to look at the engine. Could it be fuel delivery in some way? Are there ways to test fuel flow or the IP? Its the last part to make this van perfect mechanically, to me. Thanks if you have some advise.
Mounts are all new
Single mass flywheel with no changes whether clutch in or out
I don't see any air in the fuel lines
Fuel filter is new
Harmonic balancer is new
I don't see any wobble or shake with any of belts or rotating shafts
The engine is not contacting the body/frame/firewall
Compression is 400, 420, 420, 400 on letting it turn over 5-6 times
I went from stock injectors with 170K to Bosio DLC 520 injector with no changes in vibration (power at the pedal went up though!)
K03 Turbo is new, but only because the original was leaking.
Injection pump doesn't appear to have ever been serviced, but the van starts instantly, and the IP is not leaking.
VCDS-
Timing is dead on the middle line, but jumps up and down to the next upper and lower line interval
IQ is 3.4, but theres not much change if I move it up to 3.8 or down to 2.6.
Injector values are 0.14, -0.21, 0.12 (bosio DLC 520)
So I'm open to any advise to help remedy some vibrations. Or if someone knows a trusted mechanic in the North Seattle area to look at the engine. Could it be fuel delivery in some way? Are there ways to test fuel flow or the IP? Its the last part to make this van perfect mechanically, to me. Thanks if you have some advise.
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