Car starts but won't rev

[bear2020]

Might be an easy one but I can't find anything on it

I took both the doors off my car swapped them over for same doors different colour fitted them both back on and the car runs and ticks over fine but will not rev at all
The guy who I swapped doors with is also having the same problem!

Thanks

 

[AntStark]

I have to ask..why did you both swap doors for another colour?

 

[bear2020]

I have to ask..why did you both swap doors for another colour?

I wanted different colour doors to the rest of the car

I had all the panels from his car so swapped the doors to match the new colour. As he is building a kit car and the whole lot needs to be resprayed it did not matter what colour his doors were.

 

[Zephyr]

1- have you disconnected the battery before cutting the central locking wires? (I suppose you connected them back when fitted the doors) if not the system is jammed.
2-have you installed back the door locks? (From your car to his doors?)
3-do you have a scanner?
4-do you have a remote fob or a remote key?

 

[NZ00Z3]

The only electronic items in the doors are the air bags and door actuators. Neither of which need to be coded to the car.

Do you have any warning lamps up on the dash?

Set up INPA and read the trouble codes in the engine DME and the airbag module (just in case).

 

[bear2020]

1- have you disconnected the battery before cutting the central locking wires? (I suppose you connected them back when fitted the doors) if not the system is jammed.
2-have you installed back the door locks? (From your car to his doors?)
3-do you have a scanner?
4-do you have a remote fob or a remote key?

1 battery was not on the car and been indoors so not that and the harness for the door was unscrewed and put straight back onto the new door. No wires need cutting
2 door locks have not been changed (something we need to get around to doing) but not sure why that would make any difference?
3 yes Use INPA just wondered if there was a quick fix to look for
4 remote central locking works fine on the car locks and unlocks with no problems

 

[bear2020]

The only electronic items in the doors are the air bags and door actuators. Neither of which need to be coded to the car.

Do you have any warning lamps up on the dash?

Set up INPA and read the trouble codes in the engine DME and the airbag module (just in case).

No warning lamps quick scan (Not INPA) showed no faults

 

[Zephyr]

This has to be one of the strangest issues around. I would suspect bad wiring but since you just plugged and played there has to be something else that bothers the ecu.
In all seriousness I would suggest to put the doors back to the original cars and try… (as a desperate last try).

 

[Oddly Godly]

Is this a z3 or z4. Are both cars same age. Also manual or automatic

 

[t-tony]

First thing I would try before swapping doors back or anything of that order would be treat each wiring loom connectors with electrical contact spray. May be a simple and easy fix.

Tony.

 

[bear2020]

First thing I would try before swapping doors back or anything of that order would be treat each wiring loom connectors with electrical contact spray. May be a simple and easy fix.

Tony.

I did mine before I fitted the doors. I do it with all electrical connections just something got in the habit of doing.

 

[bear2020]

Is this a z3 or z4. Are both cars same age. Also manual or automatic

Z3 both same year both same gearbox and engine.

 

[bear2020]

This has to be one of the strangest issues around. I would suspect bad wiring but since you just plugged and played there has to be something else that bothers the ecu.
In all seriousness I would suggest to put the doors back to the original cars and try… (as a desperate last try).

I've never seen anything about it or like it before. She will start, she will drive forwards and backwards when gears selected, she will tick over just no revs.

 

[NZ00Z3]

I've seen it before when the ABS module had not been coded to the car.

Need the DME codes via INPA before we can really help.

Many BMW codes have corrisponding Pxxxx codes.
A PXXXX code can have several BMW codes mapped to it
There are BMW codes that do not have PXXXX codes. Maybe you've got one of these.

 

[jaguartvr]

I have swapped quite a few doors around and it has never given a problem.
I did have a car that would start fine but not rev. The throttle butterly has stuck due to standing, just needed a tap and some lubrication.

 

[Rod and Kate]

I wanted different colour doors to the rest of the car

I had all the panels from his car so swapped the doors to match the new colour. As he is building a kit car and the whole lot needs to be resprayed it did not matter what colour his doors were.

Phew

 

[bear2020]

Had a few hours to play around today (Been a bit slow as had a back procedure and elbow reconstruction) but think I have found what the problem is.
My car had side airbags, the door I swapped them with does not. My C110 did not flag this up but INPA has. Now the original plug and play harness from the car will have the wiring for the airbags however the door does not.
So I am guessing my options are go get the wiring harness from my old doors and the side airbags and fit them to the new doors or if I can decode the side airbags so they do not exist which I am guessing should be possible for the models that did not have airbags?

 

[bear2020]

Just a quick follow up on this in case anyone ever comes across it
The car not revving had nothing to do with the airbags at all

Once I had put the boot lid on and reconnected the wires the car revved. Unplug the boot lock and the car won't rev. It was as simple as that. Why? No idea!

 

[Andyboy]

Door locks and boot locks give high and low signals to the body control module. From late 1992 BMW's had 'drive away protection' meaning the starter and fuel pump wouldn't work if there wasn't the correct signal from the central locking system. I'm guessing it's a later version of that in addition to EWS.

 

[bear2020]

Door locks and boot locks give high and low signals to the body control module. From late 1992 BMW's had 'drive away protection' meaning the starter and fuel pump wouldn't work if there wasn't the correct signal from the central locking system. I'm guessing it's a later version of that in addition to EWS.

It would start, tick over put it in gear and it would crawl forward and backwards just would not rev. Weird but found it in the end and obviously an issue nobody has ever come across before on this forum.