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[Timetraveller5]

2.5td oil burner

I very recently had an ECU & transponder change over...Since the change over I am facing problems, sometimes the car starts & drives perfect, other times the glow plug light does not light up or work, the car will start if it is turned over for long spells & really give the accelerator pedal some, 4 or 5 full pushes in/out, then she fires up with lots of smoke, & usually runs rough & sometimes stalls. Another time the glow plug light comes on & goes out & she starts & drives perfect. My mechanic is suggesting the Bosch pump, but to me it sounds like an electrical problem?

I am at a loss as what to do.

Any suggestions/advice greatly appreciated 
Cheers Martin

[Timetraveller5]

I think i may have solved my problem, the car starts great when cold, it is only when the engine is hot, it struggles to start, I never experienced this before. The previous ECU was chipped, even when the engine was hot the glow plug light would come on & heat the plugs & deliver fuel.
 I have ordered a hot start kit via Ebay. I am hopeful this may solve my problems, I am posting this, as it may be helpful to op.

PS: If you are wondering why I am not reinstalling my Chip from my previous ECU, if got fried.... long story... 

Cheers Martin

[zirk]

Also worth checking your GP Relay on the TD's while your messing about, it works independently from the GP dash light, stays on for another few seconds after the Dash light goes out. The Relay contacts can arc up giving intermittent voltage to the GP's.

GP Relay is in the engine bay fuse / relay box, BMW part with six wires hanging off the top feeding the GP's, gently prize the black cover of the relay, and check the two contacts inside. 

[Timetraveller5]

Also worth checking your GP Relay on the TD's while your messing about, it works independently from the GP dash light, stays on for another few seconds after the Dash light goes out. The Relay contacts can arc up giving intermittent voltage to the GP's.

GP Relay is in the engine bay fuse / relay box, BMW part with six wires hanging off the top feeding the GP's, gently prize the black cover of the relay, and check the two contacts inside. 

I was trying to find out which was the correct relay, thanks for your informative post, Is this the correct relay?
If so do you mean the two screws, if so I unscrewed & removed the plate cleaned it with emery paper & put it back.


Cheers Martin

[zirk]

Yep, that's the one, the two contacts I'm on about are inside the relay.

No harm in cleaning the fuse link contacts that you mention though, one side goes unswitched direct to the battery via a red jumper lead from memory.

Got a pic somewhere on the two internal contacts, will try a dig it out.

[zirk]

Here you go, gently prize the cover off, note the second photo close up shows the contacts are pitted / arc'ed, as said, this can cause intermittent current flow to the relays on start up and or temporally short across with engine vibration which will either fry the GP's and sometimes kill the battery unexpectedly when parked up, as the GP's draw a fair amount of current.

[Timetraveller5]

Thanks for that, not too sure if i am going to tackle it, in case I mess something up.

I was thinking about fitting a none return valve after the diesel filter, has anyone done this this? I read it on a Landy forum, i think...

Cheers Martin

[Keith ABS]

The 2.5TD can take a while to fire if the fuel level is below quarter tank. They have an auxilery electric pump to sort of prime the main pump. That used to happen on mine

Keith b

[Timetraveller5]

I fitted a Hot Start Kit (with a friend who is an electrical engineer) it was quite straight forward, the kit came with detailed instructions, it certainly seemed to have solved my problems, not sure about the long term effects, but it will do until I refurb the Bosch pump or sell the car, whichever comes first...

Cheers Martin

[TheBoy]

Sorry I'm late to this. The TD is known for warm start problems.

Decent remaps cure this, or you can use hot start kits as you already have