E30 Zone

right my car decided to act up on me the othe day so changed teh plugs and leads drove it down from dairy it was lacking power ....struggling to get up a slight hill .......


put it on diagnostic machine ..... AFM problems ...... tried 2 different afm on it still lacking power ......



any ideas

cheers bigred

need to elaborate on the problem.. any funny noises, engine sound change from normal, etc, etc?

maybe a bad TPS sensor or a decently sized intake leak after the AFM somewhere?

is the fuel system (pump, injectors, regulator, etc) and ignition system (plugs, leads, dizzy & rotor arm, coil, etc) all known to be working ok?

what model/year also?

Air leak is very likely. Would show up as a AFM fault on the diagnostics.

cheers brian thats what a was thinking .......


plugs , leads , have been changed ... goin to have a bit play with it tomorrow see if i can find any leaks

brake cleaner

iiii am gonna go invest in some tomorrow

tried another afm today its still doin the same thing checked around the engine for pipes off cant see anythin .....took it for drive its still doin it ....


it REALLY has got me baffled now

bump

You haven't told us what your car is yet, other than big and red.
Such details are useful when trying to work out what's wrong with things!

It's an M40 donk I'm sure Brian.

Had the same prob with an M40 recently. It was eventually the afm - there is a video on u yube about taking afms apart and re-positioning the potentiometer wiper arm to get a better connection. I had a go at this - no joy. If/when trying another - make damned sure you get an exact replacement with same bosch/BMW serial number ( stamped on the top). I tried two or three - until problem went away when I fitted a replacement with an exact serial number match. That was my experience anyway! Main/fuel pump relays another thought -low cost trial to replace - in addition to the other things mentioned in postings above. Good luck with this - damned annoying bit theres the right answer out there somewhere!

316I M40 BRIAN

changed afm today it ticks over spot on but as soon as ai give it few revs it lacks power again ...... wanna try get this sorted this week before i take it off the rd to put new lump in would rather it be running properly before hand ....... it goes in my newly aquired garage on friday night ........