whats this????

[mattandjazze30]

was wedged in the ht leads

[sihooker]

Thatn looks like the pick-up for the rev counter that goes on lead number one.

[mattandjazze30]

The rev counter is working??

[sihooker]

..at least I think that's what it does..but it's definitely where it belongs!

Looks like your new motor has a few teething troubles mate...welcome to E30 ownership!

[sihooker]

Try starting the car with it pulled away from the leads.It might not be the rev sensor(think it is though)but if not it might be the cause of your running probs...

Number one lead should unscrew and thread through the hole in the middle of the sensor.

[pac1982]

At some point your car may have been owned by a boy racer with one of those massive rev guages with a shift light stuck on the dashboard, only reason i say this is becuase my mates has one fo the forementioned boy racer rev guages and his sender looks just like the thing pictured above

[docscott]

Looks like Rev Sensor to me too..!!
Does rev Counter work when offending item held away from leads??

[zaust]

It's for diag of the rev's, going back into the ecu. Won't harm if it's not there.

[Rav335uk]

There is no way of putting that back i'm afraid, it comes already attached at the factory

[mattandjazze30]

number six???? its a 4 pot

[mattandjazze30]

if it helps it joins to the wire from the crank senser ???

[Brianmoooore]

The sensor is the E30s' equivalent of a cam position sensor. Without the signal from it, the ECU will not know which of the two pistons rising up the bores at any one time is on its compression stroke, and which is on the exhaust stroke, so it fires the injectors together, rather than just the one for the cylinder on the compression stroke.
The sensor is permanently fitted on its ignition lead, so it looks like the engine in question has been fitted with aftermarket leads.

[mattandjazze30]

yup its the one you have circled is that why its running so bad and over fueling? thanks so much for your help

[sihooker]

You could try pulling the lead off the dizzy cap and seeing if the elbow bit will unscrew.

I bought a set of leads years ago from GSF and i had to assemble it myself(including threading it through the plastic casing!!)..it might be one of those sets.