m42 running problem

Post Mon Nov 30, 2009 8:42 pm

See if anyone on here can help me please with a runing problem with my bmw compect!

Bit of a story.

I bought a 1800 16v motor from a guy in london, he told me to replace the injector seels when i put the motor to my compact. This motor was out of a L reg compact ti.

So i put the motor in, changed the injector seals, and went to start it up.

... After i had put the fire out, [:^(] i found that i had put the fuel rail back on wrong, and had bent the fuel rail. So I took the one off my 1600 single cam bmw motor and fitted that.

The car ran after a tow, ran nice above 3,000 revs, but would not idle and would not drive below those revs.

On inspection i found out that the 1600 fuel rail was much taller than the 1800 one, it was holding part of the inlet manifold up, so i tried to mod it to fit, but it never worked right.

I then bought a 1800 fuel rail new from bmw, this is much lower and more compact design. Now i have fitted this and expected the car to go off the key, but no! It again just turns over and wont start unless you give it a tow.

Now when it runs, its missfiring randomly, not much power, will idle but not very well, the cat started to smell, so i turned it off. I took the plugs out and they are all very sooty and very black.

I have been told that i should have a look at the temp senders on the block, there is two multiplugs, i think i have them the right way about as the temp gauge works. I havnt yet tried a new temp sensor for the brain.

Tomorrow i will try a new sensor, but after that i have no idea, could you please give me some ideas of what i can check and what could cause this missfiring.

thanks!

Post Mon Nov 30, 2009 10:22 pm

Stupid question but I did summat similar. Have you connected the coil pack up to the leads in the right order?

Post Mon Nov 30, 2009 11:02 pm

Yes mate, and i have tried a new coil pack and leads too!

thanks for the reply

Post Tue Dec 01, 2009 11:19 pm

Is the loom different in a e30 and e36 where it plugs in to the main loom?

I cant get a crank sensor reading when plugged into the computer!

Post Mon Dec 07, 2009 5:32 pm

I would reckon so mate!

Post Fri Dec 11, 2009 12:25 am

it was plug and play it was the fuel pump relay!