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Lumpy Idle When Cold


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#1 flames7607

flames7607

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Posted 14 September 2019 - 09:46 AM

Hi Everyone

 

2003 1.9Tdi, PD engine, 90k miles

 

Two problems

1. Misfiring when pulling in 1st and 2nd

 

2. When starting from cold, engine ticks over with an intermittent stutter/misfire until the engine is warm, accompanied with dark blue smoke from the exhaust, which coincides with the stutter/misfire

 

I've solved Problem 1 (hopefully) by fitting a new injector wiring loom, but Problem 2 persists.

 

I hooked up VAGCOM and there are no fault codes, however the readings on Measuring Block 13 seem a little strange. Cylinder 1 is always much higher than  the other 3. Regularly over 2.0 during the misfire. Whilst it's still within what VAGCOM says it should be (-2.8 to +2.8) the other cylinders have much lower readings. Am I right in thinking that the high reading is associated with the misfire ? When the engine has warmed up the misfire goes away, and all the readings on Block 13 are all low.

 

Also, in Block 4, (Unit injector valves command) box 2 reads 4.3 BTDC and box 3 reads 5.1 CF. I'm not sure if those readings are relevant

 

Clutch in or out doesn't make any difference.

 

Any suggestions gratefully received

 

Cheers