Cutting out

[stu79uk]

I have a m20b20 engine in my cab. Just wondering if my blue temp sensor is not getting enough water flow would it cause a false reading thus causing the car to think its cold and over fueling and cutting out.

[stu79uk]

Anyone? Really struggling here.

[Brianmoooore]

Far more likely the sensor is dud, and more likely again that the wiring going into the lower half of the injector loom plug and socket has rotted.

[stu79uk]

thanks a lot brian it,s only cut out sporadically sometimes it runs for ages then others it only just starts then immediately cuts out. i have changed the sensor for a new one and the problem is still there. ill chack the loom plug ans see what condition its in. ill report.

[stu79uk]

checked the loom plug under the inlet and all seems ok, not rot or broken wiring I cleaned the throttle position sensor and all the connectors. Would the blue temp sensor cause the engine to cut out even when the engine is cold. Can't understand why it always starts but then just stops after a second or so.

[stu79uk]

anybody. Spent today trying to solve this.I'm missing all the sun.

[Brianmoooore]

What happens to the rev counter when it cuts out?

[e30topless]

stu bring it over next weekend will get this sorted

[stu79uk]

cheers Steve I'm stuck mate. I'll look tomorrow at counter

[stu79uk]

the counter looks normal when started but hard to tell cause it stops so quickly. What's your thinking

[Brianmoooore]

The engine doesn't stop quickly when you're driving along. In fact, if you're going down a steep enough hill, it won't stop at all!

[stu79uk]

I can't drive anywhere it doesn't run long enough to even get it out the garage. It starts then stop almost immediately.

[Brianmoooore]

What happens to the rev counter when it cuts out?

[stu79uk]

its as if i have just turned the key off rev counter drops to zero. saying that it barely has time to reach normal idle before it cuts out.

[Brianmoooore]

its as if i have just turned the key off rev counter drops to zero. saying that it barely has time to reach normal idle before it cuts out.

Right; that confirms it's an electrical fault.
Either the ECU is losing crank position sensor pulses, or it is losing one of its power supplies.
Unfortunately, There's no easy way of checking for certain whether the CPS is faulty, and the power feed points you need to test are hard to access.
Connect a 12 volt bulb between the ignition coil + terminal and earth (on the suspension turret), and see what it does when the fault occurs.
Beg or borrow a replacement DME relay (white one under the cover by the air filter/meter) if you can, or alternatively, unplug it and use two pieces of wire to connect together pins 30 and both 87s of its socket.

[stu79uk]

right thanks I'll try that first thing. I'll report my findings.