Re: Daewoo Lanos 1.6 ('98) ECM weirdness

redwood wrote:

"Tim S" <ts@xxxxxxxxxx> wrote in message
news:44778a27$0$775$5a6aecb4@xxxxxxxxxxxxxxxxxxxx
And another tiny followup...

Exactly 4 hours are bolloxing itself, it starts first time.

Got to be heat related methinks...

Yes, from the sounds of it it does appear to be a heat related problem.
Sorry I can't be of any more help but do let us know if you discover the
problem as it will be worth knowing for future reference.

No, not at all - you've been a great help :)

Thanks to your advice I've checked all the silly things it might have been,
which means I'm less worried about putting 100 quid or so on the line for a
speculative change of the crank sensor...

And you've formed part of a consensus decision, along with me and two
recovery men. Our village mechanic hasn't got any more idea than Vauxhall
why it's gone wrong, but he agrees it's likely too, and I'm happy enough
not to blame him if I'm wrong, and he's happy (unlike Vauxhall) to "have a
go".

The only known ECU problem that I am aware of is the high idle problem
that is a common fault with the Lanos. At some point the engine will
not idle at the correct 850rpm but instead idles at around 1500rpm.
Daewoo are aware of the problem and have a software update for the ecu.
To save paying Daewoo I found this temporary fix that's worth
knowing.

Ignition On
Disconnect Idle Speed Control Valve
Ignition Off
Re-connect Idle Speed Control valve
Repeat 4 or 5 times
Start Vehicle - It may not idle unassisted so use the throttle.
Keep vehicle idling on throttle to initialise self learn process
It should now idle within parameters.

That fix should last a few months, just repeat if the problem reoccurs.

That's interesting. Never had the problem, but the workshop manual does
detail a procedure you should follow if the battery is ever disconnected,
which goes like this (quote verbatim):

"IDLE LEARN PROCEDURE
Whenever the battery cables, the powertrain control module
(PCM)/engine control module (ECM), or the fuse is disconnected
or replaced, the following idle learn procedure
must be performed:

1. Turn the ignition ON for 5 seconds.
2. Turn the ignition OFF for 10 seconds.
3. Turn the ignition ON for 5 seconds.
4. Start the engine in park/neutral.
5. Allow the engine to run until the engine coolant is
above 185³F (85³C).
6. Turn the A/C ON for 10 seconds, if equipped.
7. Turn the A/C OFF for 10 seconds, if equipped.
8. If the vehicle is equipped with an automatic transaxle,
apply the parking brake. While pressing the
brake pedal, place the transaxle in D (drive).
9. Turn the A/C ON for 10 seconds, if equipped.
10. Turn the A/C OFF for 10 seconds, if equipped.
11. Turn the ignition OFF. The idle learn procedure is
complete."

Mind you, the workshop manual thinks I have a 16pin OBD-II diag port and a
few other bits I don't have, so the above might not apply to my earlier
('98) engine. There seemed to be a few minor changes on the Lanos' around
2000. Wonder why Haynes never did a Daewoo manual set.

Cheers

Tim
.

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