HELP!!!!

[H-M3]

Drove car for 20 mins then car starts jerking very aggresively rev goes funny and car stalls. Exhaust makes very loud noise. This only happens when the car warms up. Recently I changed the ecu, I put an ecu with an superchip installed, but this did not affect the car as i drove it for 2 weeks after puting the ecu on. cars a 325 on an h plate. please help.

[H-M3]

so no one can help me??? my car is parked up it miss fires!! but not always. this is p###ing me of.

[tickle]

could be fueling/timing issues, does the xhaust noise happen all the time or only when juddering,

what engine do you have?

[H-M3]

makes noise only when it judders. Ive put the old ecu back on and put some injector cleaner in. no joy. its a 2.5

[H-M3]

Anybody?????? it only happens when the engine is at normar operating temperature.

[Brianmoooore]

Anybody?????? it only happens when the engine is at normar operating temperature.

Standard amswer is "blue temp sender". (Screwed into the thermostat housing, top front of engine.

[dobbie82]

yeah thats a good place to start, they aren't an expensive thing even from a dealer.

[H-M3]

cheers for the response guys. would that cause the engine to missfire?
also i changed that about six months ago.

[Brianmoooore]

Dud blue temp sensor would cause the engine to overfuel when hot, and cause a missfire. Trouble is, several other things can cause a missfire as well, and it's near impossible to tell you which from 200 miles away.
Don't assume a new part is always a good part, especially if it didn't come in a BMW box.
The signal from the temp sensor goes through a round plug and socket fixed to the metalwork under the inlet manifold. Corrosion in here can cause problems.
Distributor cap, rotor arm and plugs are all candidates, as are the inlet manifold gaskets and rubber air hoses.

[H-M3]

Thanks Brian, I called the aa guy at the weekend to see if they can share any light. he took the distributor cap off and cleaned it up, whilst he was trying to put it back on he I think broke a bit off the round plastic!!!! obviously he said that is the cause for the missfire(backfire) so I went to Halfrauds to get replacement cap an rotor. Still same problem.. Backfire!!! make things worse whilst trying to take off the blue temp switch I bloody ended up breaking the brown one!!!!!!! still havent maneged to change the blue one. AAAAARRRGGGHHHH!

I had to get the lovely london transport today to work.

Also brian i checked the spark plugs they look fine slightly brown in colour but ok. The fuel pump is slightly noisey but i wouldnt have thought that would be any probs? Sorry for making it long, thats the only way I guess is to get it off the chest. end of the day this is a friendly site(zone)

[H-M3]

Changed the blue and the brown sensor switch still doing the same!!!

help

[GermanGorilla]

Hi H-M3,

Are we talking of an M3 here ?

If yes, your symptons suggest that your Flywheel sensors are going defective or need cleaning.

Nearside of the bellhousing, about a third of the way up, alloy cowl, undo the 2 x 10mm bolts holding the cover in place.
Undo the 2 x10mm bolts holding the sensors in place.

Remove sensors, clean well with white spirt, dry and replace, do not bolt up tight.
Start car, if car still the same remove the sensors again and swap them around, top for bottom etc, but remember to swap them as well at the electrical connectors behind the plastic cowl on the bulkhead.

If this does not work, do not forget to then swap them back.

Hope this helps,

Regards,

The Gorilla.

[H-M3]

Hi Gorilla, sorry mate I know my sig name is M3 but unfortunately its not an m3 its a 325 on h plate. can you help?

[e30-320i]

what about air flow meter

[H-M3]

what should i check at the airflow? funny thing is it only happens when its normal operating temp!!!!!! all this is going to cost money, i can feel it. ive already changed as ht distributor and rotor.

[GermanGorilla]

Hi H-M3,

OK, I do not know much about 325's, but it still sounds like a fueling/ ignition problem, at operating temp.

Suggestions -

Check Fuel pump Relay - Can warm up when going faulty
Crank Position Sensor working- think you have one at the front of the engine
MAF/AFM - may need cleaning / can be done carefully
Sticking Injector- when engine has warmed up

You need to go through a step by step process, otherwise your pi**ing in the wind.

Hope this helps,

Regards,

The Gorilla.

[Brianmoooore]

Have you checked the plug and socket under the manifold that I mentioned?

[jonbuoy]

I do beleive you might have a lambda sensor on your exhaust. Check to see if you have, might solve your problem by renewing this.

[Martinaston]

What kind of noise does the exhaust make ?

[H-M3]

it does have a lambada sensor there, but i took the cat off and replaced with stainless steel ones long time ago. The exhaust makes loud banging noise as as if air is trapped. (shot gun)

Brianmoore no i didnt check the bit your on about, I will do so. Do i have to undo anything to get to it? sorry dumb Q.



Also how much would a lambada sensor cost?

[Brianmoooore]

it
Brianmoore no i didnt check the bit your on about, I will do so. Do i have to undo anything to get to it? sorry dumb Q.

Removing the air filter / AFM assembly would make it easier to get to.

[jonbuoy]

Also how much would a lambada sensor cost?

Not absolutely sure mate but i'm sure you will have no trouble getting one from Euro Car Part's

[H-M3]

jon before i go out buying more parts. is the lambada known to create symptoms like this? also I thought the ecu normaly would run on open loop when there is fault with the lambada???? can anyone say much more on this.

sorry brian dont mean to undermine your friendly advice buddy its just ive spent quite alot of money already.

[Brianmoooore]

sorry brian dont mean to undermine your friendly advice buddy its just ive spent quite alot of money already.

?????? Not much expense involved in checking out a plug and socket!

[H-M3]

sorry brian dont mean to undermine your friendly advice buddy its just ive spent quite alot of money already.

?????? Not much expense involved in checking out a plug and socket!

Sorry Imeant Jonbouy

[H-M3]

Did a diagnostic check and the computer didnt pick up no faults!!!!!
Im thinking have I damaged any sensors due to putting in an ecu with superchip?? I need to ask our genius ANT. anyone know where Ant is??? help!!!!