Warm Starting Problems ?

[Billy1972]

Hi,

I've a 1987 325i vert manual which doesn't like to start when it's warm/hot?

When it's cold it fires up on the button with no hesitation and like a dream.

But once it's up to running temperature and driving around it seems to crank over for a while before she fires up?

Any idea on what I need to change or is this the norm for an old 325i?

Thanks

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[Cloggy Saint]

This is a symptom of a fuel leak although it could be something else!. Carefully check all the lines.

[aimlessrock]

when were the injectors last overhauled?

[Billy1972]

It has it's MOT last week and there are no issues with the fuel or fuel lines, I also had a good look underneath and they are fine.

Injectors? I only purchased the car in October and I haven't touched them and there's nothing in the history folder? If it was injectors wouldn't they also effect it when it was cold?

[Cloggy Saint]

A leaking injector(s) would show the symptoms you describe.

[tha881]

One tip is to be very gentle and quick when turning the key. It only needs the most minor of spark to fire into life. I think most m20 cars have this issue, ive had two that done it, and doing what I said always meant it fired straight away, rather than cranking it hard for 5 seconds to get it going.

[Cloggy Saint]

This isn't an M20 quirk, it' a fuel related problem!

[aimlessrock]

if the history is silent on them being overhauled (adding some injector clearer to the fuel is meaningless btw) remove them and have them cleaned, removal guide is in the wikki - its straight forward , injectortne (one of the traders) can overhaul then for about £12-15 per injector.

[Billy1972]

I'll check and clean the injectors when my mechanic friend comes over and i'll also try the gentle but quick key turn.

[aimlessrock]

unless you have the equipment to properly overhaul and more importantly balance each injector you will be wasting your time- they need cleaning via ultrasonic, balancing and fitting with new seals et al- Injectortune will do the lot for £15.00 per injector.

most zoners simply purchase a used set from a trader, have them overhauled and then fitted- the old set are then resold etc.

[davidt]

One tip is to be very gentle and quick when turning the key. It only needs the most minor of spark to fire into life. I think most m20 cars have this issue, ive had two that done it, and doing what I said always meant it fired straight away, rather than cranking it hard for 5 seconds to get it going.

Agree with you 100%