Thread: annoying hot/warm starting problem

When you changed the stepper motor, did you check the mating surfaces and clean those up too?

Also, try to clean the MAF both internally and the electrical connectors to it.

After that... maybe lambda sensors?

stepper motor was replaced by Ritter L/R service centre, so I have to assume they did it correctly....also, I have no idle problems as such, only those brief first few seconds after 2nd start up. Also, no problems starting cold.
OK, will clean out the MAF and check its connections, lambda sensors, what and where are they located?

The stepper motor could be replaced without cleaning the mating surfaces and still have been fitted correctly. Unclip the connector to the stepper and using 5mm (i think) allen key, unscrew the the housing that the stepper screws into and remove it. Check the gasket and clean it internally. 10 minute job so easy to rule out.

I'm not too sure about whether the lambda sensors could cause your problem. They are the O2 sensors on the front downpipes on the exhaust. They measure the CO in the exhaust which is fed back the ECU to help control the idle. Might be worth waiting for someone else's thoughts on this before heading this route, I don't think the O2 sensors are very cheap.

Originally Posted by westonben

Might be worth waiting for someone else's thoughts on this before heading this route, I don't think the O2 sensors are very cheap.

Nor are they fitted to Aus built D1s

Originally Posted by westonben

The stepper motor could be replaced without cleaning the mating surfaces and still have been fitted correctly. Unclip the connector to the stepper and using 5mm (i think) allen key, unscrew the the housing that the stepper screws into and remove it. Check the gasket and clean it internally. 10 minute job so easy to rule out.

thanks for that...now THE question, where do I find the stepper motor??, been trying to actually locate it, manual is not very clear or I just don't know how to read

I'm not too sure about whether the lambda sensors could cause your problem. They are the O2 sensors on the front downpipes on the exhaust. They measure the CO in the exhaust which is fed back the ECU to help control the idle. Might be worth waiting for someone else's thoughts on this before heading this route, I don't think the O2 sensors are very cheap.

OK...thanks!

No D1's in Aus have Cats fitted?

In that case, maybe you could have the MAF tuned. Do you get any smoke??

Another easy check is the throttle plate. Whilst you've got the MAF off clean the plate too.

Let us know how you get on.

Originally Posted by westonben

No D1's in Aus have Cats fitted?

In that case, maybe you could have the MAF tuned. Do you get any smoke?

Nope, no cats either

Your disco has a fuel temp sensor on the fuel rail at the front of the engine. (Black plug on a black sensor) It's purpose is to aid hot starting by 'leaning out' the fuel delivery when engine is warm to aid in smooth quick starts. This could be all it is. I would also check and clean the throttle plate and intake, as even with a new stepper motor, this needs to be CLEAN.

JC