Help It Won't Start !!!!

[JG911]

Yes, I have removed and replaced the reference/ speed sensor.

Do you fancy doing another 1

[JG911]

Fingers crossed its going today

[JG911]

Yes, I have removed and replaced the reference/ speed sensor.

Hello Allan,

My friend is going to be doing the sensor in the next few days and iv seen on a other forum that there is 2 sensor which 1 is it i will need to replace ?

[tr7v8]

I'd change both unless you've scoped them & found which one is dead.

[JG911]

Yeh thats what i was thinking,my friend is a mechanic so fingers crossed he can test them to see which it is,if not ill get another.

Also iv been told there is a BMW sensor which also fits and works and cheaper

[JG911]

I'd change both unless you've scoped them & found which one is dead.

Guess what i need to buy my freind tested both of them yesterday and 1 was dead and the other i think he said was 1,000 ohms and the new 1 was 9,000.

[zola1]

I'd change both unless you've scoped them & found which one is dead.

Guess what i need to buy my freind tested both of them yesterday and 1 was dead and the other i think he said was 1,000 ohms and the new 1 was 9,000.

Hi

Has you tech guy got a scope this might help :-



http://forums.tipec.net/viewtopic.php?f=13&t=4483

[JG911]

Thanks

Iv brought another Bosch sensor so fingers crossed put it with the other new 1 and she should be running soon

[JG911]

Update

Last night we changed both flywheel sensors and put a new battery on and checked the coil and all working ok there

BUT

It's still not firing,just keeps turning over,rev counter very very slightly bonces,alarm bleeps ok,smell petrol aswell and can hear the fuel pump

Any more ideas please

[tr7v8]

Update

Last night we changed both flywheel sensors and put a new battery on and checked the coil and all working ok there

BUT

It's still not firing, just keeps turning over,rev counter very very slightly bonces,alarm bleeps ok,smell petrol aswell and can hear the fuel pump

Any more ideas please

Got a spark? Is it in the right place? Remove plugs bake in a warm oven or replace with new & try again.
Get a tin of easy start, & get someone to blast it down the intake whilst someone else turns the key.

[JG911]

No there is no spark we can smell petrol and we can hear the pump going and i think my friend said the coil has 12 feed but it's not coming out we tryed my coil on his 911 sc and it works fine

[tr7v8]

No there is no spark we can smell petrol and we can hear the pump going and i think my friend said the coil has 12 feed but it's not coming out we tryed my coil on his 911 sc and it works fine

So assuming to works the same as the 944 (similar era) then one side of the coil should be at a good 12V, try connecting a bulb to it & ground. The other should switch to earth to trigger the ignition, if the sensors are OK then it sounds like the ECU. Have you scoped the sensors to check you have a trigger? BBAReMan or ECU doctor can check the ECU if needed.

[JG911]

Hello Jim when i was round helping my friend with it he says the sensors are fine.

So looking towards the ECU then

[zola1]

Hello Jim when i was round helping my friend with it he says the sensors are fine.

So looking towards the ECU then

hi,

try this site for ALL motronic info ...

http://www.frwilk.com/944dme


here is pin out of the ECU

before you condem ECU do a Point to Point continuity test on the wiring

motronic pin out.jpg

Here is a pic of a 911 ECU,

911 ECU PIC.jpg

is your ECU the smae part no ?

any probs feel free to ask


Jim,

Are the ign drivers inside the Motronic on this model ? i know they are on my 87myr 944 2.5n/a, i'm not sure on a 911 !, they may have a external ign amp !!

[tr7v8]

Hello Jim when i was round helping my friend with it he says the sensors are fine.

So looking towards the ECU then

hi,

try this site for ALL motronic info ...

http://www.frwilk.com/944dme


here is pin out of the ECU

before you condem ECU do a Point to Point continuity test on the wiring

motronic pin out.jpg

Here is a pic of a 911 ECU,

911 ECU PIC.jpg

is your ECU the smae part no ?

any probs feel free to ask


Jim,

Are the ign drivers inside the Motronic on this model ? i know they are on my 87myr 944 2.5n/a, i'm not sure on a 911 !, they may have a external ign amp !!

Not sure, I think this era run very similar management to 944s. But I think the earlier cars run electronic ignition via a separate module & mechanical ignition. Then they ran DME 944 type system, in which case the ignition/coil drivers are internal.