3B no start help

[K Simmonds]

Is one of the crank sensor plugs white to grey? Or should it be white to white and I have something mixed up?

This is a PITA!

Crank sensors are white to grey and black to black on mine and my fuse 27 is 15 amp, however I don't have the two fuses on the far right of the bottom row fitted to my car so the layout seems to be different.

[twoqu]

Nomally if iniating the output test via Vagcom you don't have to physically open/close the throttle. However it does appear that you have a TPS idle switch issue which may be effecting the output test as thats what appears to trigger it. So you will need to investigate that although its not your main issue!
Now you say you have RS2 injectors but looking at another thread it looks you don't, at least not the Bosch 984. So what are they and more importantly are they high impedence? In fact it wouldn't do any harm to temporarily disconnect them all and then see what happens to eliminate them from you enquires.
Basically if the car worked before you have to go back and examine what changes you made and how that might be responsible. Obviously an electrically dumb component is not going to have an effect!

[Error404]

That's a good point actually, if the impedance is lower they will draw more current I think?

[andy10v]

This is a PITA!

Crank sensors are white to grey and black to black on mine and my fuse 27 is 15 amp, however I don't have the two fuses on the far right of the bottom row fitted to my car so the layout seems to be different.

Thank you

[andy10v]

Nomally if iniating the output test via Vagcom you don't have to physically open/close the throttle. However it does appear that you have a TPS idle switch issue which may be effecting the output test as thats what appears to trigger it. So you will need to investigate that although its not your main issue!
Now you say you have RS2 injectors but looking at another thread it looks you don't, at least not the Bosch 984. So what are they and more importantly are they high impedence? In fact it wouldn't do any harm to temporarily disconnect them all and then see what happens to eliminate them from you enquires.
Basically if the car worked before you have to go back and examine what changes you made and how that might be responsible. Obviously an electrically dumb component is not going to have an effect!

Injectors are

rs2 replica injectors green giant 440cc new (one time use) 60 euro

I dont know if they are high impedance?

I have delphi (440s?) that were sold as rs2 injectors in the garage was well.

Unfortunately I have had the engine out, apart, fitted new parts and but everything back together, so there are a lot of variables of new parts+potential **** ups from a straightforward swap.

Another suggestion a friend made is that if the eproms are sitting about for ages (which they have been) they can be damaged by static.

[andy10v]

So current plan is

tidy up

Swap chipset from ecu that is now blowing the fuse (now bust?) into the other ecu

check timing is 100% (front end off to turn engine over) (or any other suggestions for turning the engine?)
Check crank mark
check cam pulley
check cam marks
check dizzy alignment.

[twoqu]

You only have to measure the resistance between the two terminal prongs on the injectors. If they are high impedence which Motronic uses then they should be above 12ohms. If they are 4-6 ohms then they are low.
If the injector seller used aftermarket ecu then they often use low impedence injectors. Relatively easy thing to check and better than knackering an ecu!

[UrS4boy]

check timing is 100% (front end off to turn engine over) (or any other suggestions for turning the engine?)

Roll the car in gear?

[newsh]

Roll the car in gear?

Yes, always roll it forwards onto the marks to take up backlash.

But you've had spark so it should be ok.

[twoqu]

Of course the issue has got worse somewhat but at first it sounded like a power supply issue to the injectors and then no fuel which both pointed to the fuel pump relay or the signal from the ecu which is the holding relay!
If the ecu is blowing its power supply fuse then its either drawing too much current or it is shorted somewhere.
If you don't have Mike's 3B Motronic manual it would be a good idea to download it as it will tell you which positions to probe on the fusebox.

[andy10v]

You only have to measure the resistance between the two terminal prongs on the injectors. If they are high impedence which Motronic uses then they should be above 12ohms. If they are 4-6 ohms then they are low.
If the injector seller used aftermarket ecu then they often use low impedence injectors. Relatively easy thing to check and better than knackering an ecu!

The green bosch injectors fitted are about 16ohms, the spare delphi ones about 18ohms.

Thanks.

[andy10v]

Roll the car in gear?

Its in the air in the garage, if I push it out, I cant push it back in without winching due to the slope)

[andy10v]

Yes, always roll it forwards onto the marks to take up backlash.

But you've had spark so it should be ok.

If its sparking is there any point in checking timing? Would it spark but no fuel if timing slightly out?

[andy10v]

Of course the issue has got worse somewhat but at first it sounded like a power supply issue to the injectors and then no fuel which both pointed to the fuel pump relay or the signal from the ecu which is the holding relay!
If the ecu is blowing its power supply fuse then its either drawing too much current or it is shorted somewhere.
If you don't have Mike's 3B Motronic manual it would be a good idea to download it as it will tell you which positions to probe on the fusebox.

I have it on the computer, will have a read.

I am a bit of an electrical muppet, much prefer gears I can see, so thank you for your patience.

[quattro-nick]

i 'm the seller from the injectors (hi andy)
i dont know if they are high or low impedence
I bought it two years ago with a bosch 044 fuelpump on ebay

i think they are the same as on the link
http://www.ebay.de/itm/High-Flow-42l...item1c447e3f1d

i placed them one time in my engine with vems and had no problem with injectors and engine was running