Crank Sensor

d.batch · 10-12-12, 07:47 PM

Hi all, my car is Audi 90 coupe 1990 2.3 7a engine

I’m a little stuck I’m trying to find were crankshaft position sensor is and I’m having no luck, does anyone know where this is having a diagram of where it is.

I’m having problems starting the car up it just keeps turning over but never starts I’ve checked all of the usual even tested the injectors. So the last thing I need to check (I think) is the crack sender, as I’ve been to this send the message to the injectors to put petrol into engine,

If anyone can help it would be greatly appreciated.

Many thanks

David

spink · 10-12-12, 09:22 PM

Crank sensor is on passenger side of engine next to the gearbox,you will see 2 sensors together mounted on an alloy block.i can't remember if its the upper or lower one offhand

Tonks4x4 · 10-12-12, 10:52 PM

The one nearest the engine is the firing point sender that picks up the single pin mounted in the flywheel.
The other sensor counts the teeth on the ring gear

Coxy · 10-12-12, 10:57 PM

another thing worth looking at is the drive gear on the dizzy. The original ones on the 7a engine were bakelite and have a tendency to break down and will give you the same symptoms. You can replace these with the brass gear. Think it was quattrorob who was selling these.

mikes2 · 11-12-12, 04:18 PM

Sounds like a no spark problem.

It's very rarely the crank sender.

Coxy · 11-12-12, 04:28 PM

Quote:

Originally Posted by mikes2

Sounds like a no spark problem.

It's very rarely the crank sender.

aye and points more to the dizzy drive gear.

http://www.ebay.co.uk/itm/Audi-90-Co...cfd6456&_uhb=1

get one of these to replace it.

Tonks4x4 · 11-12-12, 06:20 PM

Just take the cap off first and see if the rotor is spinning when cranking.
If it is spinning smoothly all the way round the drive gear is currently intact.

quattrostyle · 11-12-12, 06:22 PM

So what does a crack sensor actually do?

missfire · 12-12-12, 12:20 AM

It finds crack! Which ain't so easy in this neck of the woods I can tell you, the Police do a very good job of finding it all, before I do..

quattrostyle · 12-12-12, 07:26 AM

Ah bummer, no problem here even without a crack sensor

10-12-12, 10:52 PM	#3
Tonks4x4 4 ring whore! Classic Audi Club Member Join Date: Oct 2008 Location: Huthwaite, Nottinghamshire Posts: 2,607	The one nearest the engine is the firing point sender that picks up the single pin mounted in the flywheel. The other sensor counts the teeth on the ring gear __________________ http://www.tonks4x4.com

11-12-12, 04:18 PM	#5
mikes2 4 ring whore! Classic Audi Club Member Join Date: Nov 2007 Location: Polmont Posts: 2,617	Sounds like a no spark problem. It's very rarely the crank sender. __________________ 1991 90 quattro 20v sport 1991 90 quattro

11-12-12, 06:20 PM	#7
Tonks4x4 4 ring whore! Classic Audi Club Member Join Date: Oct 2008 Location: Huthwaite, Nottinghamshire Posts: 2,607	Just take the cap off first and see if the rotor is spinning when cranking. If it is spinning smoothly all the way round the drive gear is currently intact. __________________ http://www.tonks4x4.com

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10-12-12, 09:22 PM	#2
spink Senior Member Classic Audi Club Member Join Date: Dec 2007 Location: yorkshire Posts: 1,525	Crank sensor is on passenger side of engine next to the gearbox,you will see 2 sensors together mounted on an alloy block.i can't remember if its the upper or lower one offhand

10-12-12, 10:57 PM	#4
Coxy 4 Ring Mafia Classic Audi Club Member Join Date: Jul 2007 Location: on the side of a hill in Shropshire! Posts: 28,215	another thing worth looking at is the drive gear on the dizzy. The original ones on the 7a engine were bakelite and have a tendency to break down and will give you the same symptoms. You can replace these with the brass gear. Think it was quattrorob who was selling these.

11-12-12, 06:22 PM	#8
quattrostyle 4 ring whore! Classic Audi Club Member Join Date: Feb 2010 Posts: 2,188	So what does a crack sensor actually do?

12-12-12, 12:20 AM	#9
missfire making wooden things Classic Audi Club Member Join Date: Dec 2009 Location: cow land Posts: 8,156	It finds crack! Which ain't so easy in this neck of the woods I can tell you, the Police do a very good job of finding it all, before I do..

12-12-12, 07:26 AM	#10
quattrostyle 4 ring whore! Classic Audi Club Member Join Date: Feb 2010 Posts: 2,188	Ah bummer, no problem here even without a crack sensor