1.9TDi AVF uneven tickover/idle

[philfingers]

I seem to have read somewhere before that there can be a problem at high mileage (mine has 148k) on the 1.9 engines with the injector loom starting to breakdown as it runs in the oil in the engine. My A4 sounds like it's running on 3 cyl at tickover, the speed is always steady, as if the engine is compensating for it, off idle and throughout the rev range it runs ok. Is this a common problem.
I've just been completing a house move and have tools and bits scattered in boxes all over- and no time too! Would a resistance check of the injectors from the ECU highlight is this is indeed the case, the internal engine loom (which is my undstanding of it) breaking down,

Phil

[Alan02]

If you suspect the loom, you need to check the wires to each injector in turn. At the same time you need to check for short to ground / other injectors too. Then move onto the next wire etc.

[philfingers]

thanks Alan. Can i check these from the ECU end? if not do i have to remove the cam cover?

Thanks for the advice in advance!

Phil

[4810marcp]

Hello,personally i would advise a diagnostics check as it would have logged a short to ground fault on a specific cylinder.on my own experience i would look in measuring blocks of vcds to see if you have fuel inbalance across the 4 cylinders idealy all 4 should be close to 0.00% fuel drift at idle,other known issues is worn camshaft lobbs and hydraulic lifters due to incorrect oil grade

Regards
Marc

[philfingers]

thanks for the help. I'll run a diag check at lunch time. Oil grade is 507 spec oil so shouldn't be an issue. Car has done 148k runs ok. BUT it has been on longlife servicing, tho now I service it every 10k.
Phil

[Crasher]

I have an A3 Quattro outside (same engine basically) that has average mileage and full dealer service history on Longlife using 507. It needs a new cam…

[philfingers]

Can you tell by looking at them, are they generally scored?
thanks Crasher,

phil

[Crasher]

Sometimes it is possible to make out some patterning of the lobe peak but often you have to remove the cam to be sure, which is not a quick job.

[philfingers]

I did a diag scan and got the following, couldn't follow Marc's advice as i still don't have the internet at home and couldn't remember your advice. I've remover the no fault code parts to shorten the post. So doesn't look anythign wrong there. How easy is it to get to the injector plugs, do you remove the cam/top engine cover, by that I mean the part like a cam cover. Advice appreciated!

VAG-COM Version: Release 409.1-S


Chassis Type: 8E - Audi A4 B6
Scan: 01,02,03,08,09,15,16,17,26,36,37,45,46,55,56,63,76

-------------------------------------------------------------------------------
Address 01: Engine
Controller: 038 906 019 JT
Component: 1,9l R4 EDC 0000SG 1572
Coding: 00003
Shop #: WSC 63351
WAUZZZ8E13A347611 AUZ6Z0C0016661
1 Fault Found:
17664 - Engine Coolant Temp Sensor (G62): Open or Short to Plus
P1256 - 35-00 - -
Readiness: N/A


-------------------------------------------------------------------------------
Address 08: Auto HVAC
Controller: 8E0 820 043 K
Component: A4 Klimaautomat 1116
Coding: 00000
Shop #: WSC 63351
2 Faults Found:
00735 - Potentiometer in Positioning Motor for Air recirculation Flap (G143)
30-10 - Open or Short to B+ - Intermittent
01317 - Control Module in Instrument Cluster (J285)
79-00 - Please Check Fault Codes


-------------------------------------------------------------------------------
Skipping Address 15-Airbags


-------------------------------------------------------------------------------
Address 17: Instruments
Controller: 8E0 920 950 J
Component: KOMBI+WEGFAHRS. RB4 D36
Coding: 01400
Shop #: WSC 00001
WAUZZZ8E13A347611 AUZ6Z0C0016661
1 Fault Found:
00779 - Outside Air Temp Sensor (G17)
30-00 - Open or Short to B+

-------------------------------------------------------------------------------
Address 46: Central Conv.
Controller: 8E0 959 433 BC
Component: Komfortgerát T3B 1211
Coding: 07115
Shop #: WSC 63251
7 Faults Found:
01370 - Alarm triggered by Interior Monitoring
35-00 - -
00962 - Alarm via. Tilt Sensor
35-00 - -
01371 - Alarm triggered by Door Contact Switch: Driver's Side
35-00 - -
01573 - Alarm triggered by Door Contact Switch: Left Rear
35-00 - -
01559 - Drivers Door
59-10 - Can't Unlock - Intermittent
00943 - Heated Exterior Mirror: Driver Side (Z4)
57-10 - Electric Circuit Failure - Intermittent
00932 - Electric Window Motor: Drivers Side (V147)
62-10 - No or Incorrect Adjustment - Intermittent