Hi all.

This is regarding an OBD1 ABA Motronic 2.9 stock 2.0 Jetta engine I
installed in my Westy.

The ECU and wiring harness are from an automatic Jetta. Auto tranny
TCM (trans. control module) NOT present. TB is from a *manual* tranny
engine.

I have a TB from an automatic Jetta. (2 throttle position sensors) and
can swap it in.

I have yet to hook up the OBD interface, but here's what's happening.

It used to start, idle, but bog with throttle opened slowly to 1/3
way. After a 30 sec. - few minute run, I would shut if off and try to
restart. It would spin, "catch" a little, and sometimes start. Next
day, it would start. Yesterday same thing, but eventually no firing,
(catching) and no start.

I replaced rotor, cap, plugs, timing belt (timing ok) well before
yesterday. Got fresh gas half way through yesterdays trials, and
replaced the fuel filter.

Cleaned the TB, MAF, IAC, (and tried another IAC), double checked
electrical connections. Can't find any vacuum leaks. Fuel is pumping.
FP hotwired made no difference. Power gets to power supply relay, and
to 12V side of the coil.

I have not checked for spark yet, but checked one of the plugs. It was
pretty black. The exhaust (to an uneducated nose) might be smelling
rich. I can't test for power to the HOS2 sensor as engine needs to be
running.

I'll connect the OBD but will be relying on light flashes from the
"Mal" light (aka the CEL). I don't have a VAG-COM unit.

 Any suggestions as to why it won't start?

Does the ECU need to be cleared of error codes? i.e. would error codes
cause a no start?

Thanks much for any direction.

--
Neil Nicholson '81 JettaWesty "Jaco
http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines
http://web.mac.com/tubaneil
http://tubaneil.googlepages.com/