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RE: ECU error codes 1.8T motor - HELP!! (kinda long)
I am having cold start problems with my A4 1.8Tqm.
'96 1.8Tqm with MTM 187hp ECU upgrade.
K&N filter (p/n: 33-2675), Remus rear muffler/tailpipes
96 RON fuel unleaded, Mobil 1 last 62000kms
Oil consumption effectively nil, good performance when warmed.
Starting from cold (no accelerator) engine fires normally, then revs fall
to 200-400 misfires, struggles then stalls.
Might do this once or twice more before running smoothly. Then when
throttle applied revs fall before recovering.
Driving while cold: car hesitates when throttle applied before picking up.
When fully warm: no starting or driving problems
This has happened 3 or 4 times and been corrected by dealer who reports
"there were some errors on the VAG ECU test but we have cleared them now".
Car has been fine for a while then problem has recurred - however despite
service today problem is still present.
The VAG test results follow:
8D09075577 1.8l R4/5VT MOTR HS D05
2 faults recognised
16989 P0605 035
Control Unit defective
Boost pressure control solenoid-N75
<other modules follow all with "no fault recognised">
End of test
These codes have occurred on previous tests. As well an error code 01247 has
I would really appreciate anyone with technical knowledge in this area
helping me (and my dealer!) sort this out because it is a PITA!
Apologies for length of post and TIA
'96 A4 1.8Tqm
'87 80 1.8E
'98 Golf IV 1.6