Won't start when hot
Discussion
Pull an HT lead off and stick it on a suitable bit of bare metal, then crank away. Regular fat sparks mean you probably have a fuelling problem.
One thing I did figure out is that you can use LEDs poked into the injector connectors to see whether the injectors are being fired. Bear in mind that the LEDs are polarised, so try them both ways. The flash may not be very bright, but it should be regular.
Ian
One thing I did figure out is that you can use LEDs poked into the injector connectors to see whether the injectors are being fired. Bear in mind that the LEDs are polarised, so try them both ways. The flash may not be very bright, but it should be regular.
Ian
wedg1e said: Pull an HT lead off and stick it on a suitable bit of bare metal, then crank away. Regular fat sparks mean you probably have a fuelling problem.
One thing I did figure out is that you can use LEDs poked into the injector connectors to see whether the injectors are being fired. Bear in mind that the LEDs are polarised, so try them both ways. The flash may not be very bright, but it should be regular.
Ian
You can get something called a "NOID" light which goes in series with the injector (with plugs to splice it in to the loom) that is basically an LED, only cost a few quid apparently. Haven't got round to getting one yet.
Working for an electronics company i'll nick a few LED's and make a "noid" (or Eight!)I need a bigger battery anyway because my twin Kenlowes and 100 watt headlights tend to suck a lot of current.
Can't help feeling there's more to the problem though.
What could cause this to happen only when engine is hot?? will check out your archive Mark.
Can't help feeling there's more to the problem though.
What could cause this to happen only when engine is hot?? will check out your archive Mark.
There's little point in having 8 LEDs as the injectors are only configured to fire in two banks of 4. I was intending to hard-wire 2 LEDs (somewhere) to show that each bank was firing; if you just have one you can poke it into the end of each injector plug to see if the juice is reaching there. My assumption was that whereas you may have one duff injector that would cause rough running, it wouldn't stop the car starting: all 8 are unlikely to fail but as there's so much common wiring a break could take out, say, 4 of them. The LED is just a quick check.
Given the descrption of the symptoms (ie won't start when hot) I'd say the problem lies elsewhere: either the cold start injector is kicking in and adding unnecessary fuel, or the coolant temp sensor is tits-up. That's not an exhaustive list of Rover V8 fuelling problems, of course...
Ian
Given the descrption of the symptoms (ie won't start when hot) I'd say the problem lies elsewhere: either the cold start injector is kicking in and adding unnecessary fuel, or the coolant temp sensor is tits-up. That's not an exhaustive list of Rover V8 fuelling problems, of course...
Ian
cheers Ian. Had temp sensor probs about two years ago.
The ECU thought it was in the antartic and was pumping fuel like a good un, coming out the exhaust in a dense white cloud.
off to pub to mull it over with the lads.
cheers Mark read the responses to yours in the archive
and many things to consider.
The ECU thought it was in the antartic and was pumping fuel like a good un, coming out the exhaust in a dense white cloud.
off to pub to mull it over with the lads.
cheers Mark read the responses to yours in the archive
and many things to consider.
dickymint said: Working for an electronics company i'll nick a few LED's and make a "noid" (or Eight!)I need a bigger battery anyway because my twin Kenlowes and 100 watt headlights tend to suck a lot of current.
Can't help feeling there's more to the problem though.
What could cause this to happen only when engine is hot?? will check out your archive Mark.
Be very very very careful as the injectors have huge ballest resistors to drop the voltage and they are not direct drive from the ECU. The LED on voltage is similar to the injector voltage so you could get a mis reading or cause some interesting problems. You really need to use a non-intrusive method on these cars to save blowing a lot of expensive electronics.
Steve
Well,did a lot of mulling it over in pub last night, got up late and missed work! Car started fine just now as usual! Had two new outlet manifolds fitted the day before yesterday and its now idling at 2000rpm. So i'm
about to adjust it back to 800. Anything to watch out for here?
By the way it's a D reg 350i.
Whats a flapper type?
Where's the ignition coil module and whats it look like? How do i check this with my meter?
How can it overfuel only when i try to restart?
Why haven't i bought the Bible yet!!!!!!
about to adjust it back to 800. Anything to watch out for here?
By the way it's a D reg 350i.
Whats a flapper type?
Where's the ignition coil module and whats it look like? How do i check this with my meter?
How can it overfuel only when i try to restart?
Why haven't i bought the Bible yet!!!!!!
Hi, maybe you can tell me what ecu it has fitted?
I assume its the same management as fitted to the Discovery?
Whats the engine code also?
35d/36d-----3.9
40d---------4.2
Lucas CUX management.
If you know these few answers i can reference the info as i have all the relevant manuals for the V8 engines, including voltages for sensors etc.
I assume its the same management as fitted to the Discovery?
Whats the engine code also?
35d/36d-----3.9
40d---------4.2
Lucas CUX management.
If you know these few answers i can reference the info as i have all the relevant manuals for the V8 engines, including voltages for sensors etc.
4 @ltaf said: Hi, maybe you can tell me what ecu it has fitted?
I assume its the same management as fitted to the Discovery?
Whats the engine code also?
35d/36d-----3.9
40d---------4.2
Lucas CUX management.
If you know these few answers i can reference the info as i have all the relevant manuals for the V8 engines, including voltages for sensors etc.
It's not. It would be useful to know what the car actually is? It might even be a V6 or a 200.!
I assume its the same management as fitted to the Discovery?
Whats the engine code also?
35d/36d-----3.9
40d---------4.2
Lucas CUX management.
If you know these few answers i can reference the info as i have all the relevant manuals for the V8 engines, including voltages for sensors etc.
It's not. It would be useful to know what the car actually is? It might even be a V6 or a 200.!
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