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
afm problems
Moderator: martauto
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?
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?
WMMotorsports
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Brianmoooore
- E30 Zone Team Member
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Air leak is very likely. Would show up as a AFM fault on the diagnostics.
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bigredbmw
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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
it REALLY has got me baffled now
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Brianmoooore
- E30 Zone Team Member
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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!
Such details are useful when trying to work out what's wrong with things!
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E30BeemerLad
- Married to the E30 Zone
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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!
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bigredbmw
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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 ........