3B no start help

[andy10v]

Hi Nick

They are high impedance, so ok for motronic. I am sure the injectors are ok, just not the muppet who owns the car

[sjw185]

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.

Andy,

Dont think eproms would take out S27 20a fuse.
As twoqu suggested have you tried unplugging all injectors and turning on Ignition?
To check the ECU I would remove as many sensors as possible fairly easy job with plugs
Injectors, Ignition coil, maf etc
Then see if you can connect vagcom to ECU without fuse S27 fail.
If so start to reconnect sensors one at a time and maybe find what is killing fuse S27
Timing would prevent engine start but it does not blow fuses.

Cheers

Steve

[twoqu]

Here's some info from Dave:

http://forums.quattroworld.com/s4s6/msgs/22583.phtml

Without doubt the car will not start without 12V to the injectors via the fuel pump relay and ecu with ign on.

[andy10v]

Andy,

Dont think eproms would take out S27 20a fuse.
As twoqu suggested have you tried unplugging all injectors and turning on Ignition?
To check the ECU I would remove as many sensors as possible fairly easy job with plugs
Injectors, Ignition coil, maf etc
Then see if you can connect vagcom to ECU without fuse S27 fail.
If so start to reconnect sensors one at a time and maybe find what is killing fuse S27
Timing would prevent engine start but it does not blow fuses.

Cheers

Steve

Tried unplugging

injectors
maf
tps
coil
4 plugs on firewall (crank sensor etc)
2 aux looms

fuse pops when ignition turned on

unplug ecu , fuse ok.

[sjw185]

Andy,

Did you swap back or try removing fuel pump relay as this could blow fuse S27 if your "new" relay coil was faulty?
I ask as prior to changing the relay you only had a problem with S28?

cheers


Steve

[UrS4boy]

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

Umm...if it is in the air and all four wheels are off the ground, all the easier. Put it in gear and turn front wheel (forward) to turn the engine.

[andy10v]

IT LIVES!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Swapped the eproms into an ECU Newsh lent me, ran output test, injectors all clicked.

Turned the key and she fired right up!

Thank you (everybody) very much for your help, and patience.

[quattro-nick]

I'm happy for you