engine misfire and cold start problem
 

hello there i have a m44 engine with auto tranny problems are that i have a cold start problem car does not want to start when cold but will eventually after cranking for ages i have to keep foot on gas until it warms up 2 mins or else it dies other problems are misfire 52 and 62 and code 100 gear monitoring can any one plz help

First thing to examine is the rubber intake boot that goes from the airbox to the throttle body. Check that it does not have any rips in it.

When was the last tune-up?

By the way, holding the throttle down on start-up will not help you start the car...

i have checked the intake boot all looks good no rips or cracks. checked the pipes around it.

gearbox and engine all fuel filter air/oil filter changed 2 months ago runs a bit better wont start in the cold properly

i have scanned with code reader and am getting codes for the DME "175 differential intake manifold control circuit electrical" "52 misfire" "62 cylinder 3 misfire" and codes "100 gear monitoring" from the transmission control module i have replaced ignition coil pack and leads, plugs checked the idle control valve replaced crankcase vent valve the misfiring happens when you start the car in the cold after about 8-10 hours it will tick over but takes for ever to start after it warms up it runs better and idles ok has any one come across this before.

also changed the engine coolant temp sensor on the side of the engine block

Sounds like a MAP sensor or something similar. Check the www.realoem.com for all the sensors on the intake manifold, or call the dealer service center with the code and ask them. (it helps if you order the part from them too...)

Sound like errors due to the bad MAP sensor to me... (effect erors)

So that's all I have for you right now...

Also check the air filter and is the battery good.

air filter is good battery is new

ok after some research i have found that the 175 different intake code was due to the DISA valve somtimes called the change over valve replaced but this did not correct the cold start problem. do you think a crank position sensor could be causing these symptoms i have a spare crank sensor i will fit on friday and i also found that the EGS code for gear monitoring can be due to a output shaft speed sensor located in the rear top of the transmission will change both sensors this friday ill keep you informed on the progress

If either of those sensors was/were bad, I would expect a fault code for each sensor...

If you have the (known good_ parts to swap in, it is worth a try I suppose...:confused:

i have this same damn problem with mine. i haven't quite figured it out yet either.

kinda sounds like a cam shaft position sensor...

thats what ive heard, but it could also be the plugs and wires. there rated from the factory for 50k miles, and mine has a hair over 60 on it. could be time to change em'. lol

Camshaft sensor is new only fitted 1month ago coil pack and leads are new too replaced them 6 months ago still got the same problem but now its even worse im going to have a independant bmw specialist look at it tomorrow hopefully they can figure it out ill keep you informed

i think it may be the crank position sensor that is bad will replace this tommorow too

Did it work?