2.0ltr to 2.5 ltr conversion few electrical problems

[fowler]

i have just put an 87 325i lump in my 1989 320i convertible chassis
and i have a few electrical problems

Symptoms :
Lose electric windows and heater blowers whwn engine is running
BUT
but windows and blowers are fine when engine is not running
please help
as it is really annoying opening the doors to open the windows

plus speedo and odometer is not working aswell.
I have an imboliser fitted aswell
Cheers
Fowler (aka Ben )

[rowemeister]

I would check your fuses mate.

I blew a fuse once in mine (20 AMP) and the windows would not work unless the doors were opened.

[fowler]

cheers dude will check as it was dark but why the heater blower aswell

[Martinaston]

Do you have the right relays in the right places ?

[fowler]

i presume so i have not changed them from the 320i setup left the fuse box as it was

[Martinaston]

When you change from a 4 cylinder to a 6 you have to change the coding plug for the dials to work correctly, but i'm not too sure if it has to be changed when doing the 2.0 to 2.5.

[Geeman]

I tried a set of clocks from a 320i in my 325i Sport and they wouldn't work, even when I changed the coding plug they still didn't work. Very strange... gave up in the end and stayed with the original 325's clocks.

[Davenotouring]

I used a set of 325i clocks in my 320i.

I changed the engine from 2.0 to 2.5 afterwards, and it worked the whole time.

I think it's the pre/post facelift problem. :-s

[Geeman]

I think it's the pre/post facelift problem. :-s

I tend to think the same, as the 320 clocks were from a chrome bumper, while my Sport was Mtech 2...

[fowler]

but my cabby is a 1988 build so what is 6 months between the two engines

[Geeman]

There is a difference in 87's and 88's - that was the changeover period, so you could have an early engine in a late chassis... there might ben some sort of subtle difference that makes the clocks act strange.

The '87 car you had the engine out of... was it a chrome bumper or plastic bumper model?

[fowler]

chrome bumper model but so is mine what i will is try and use the old clocks sif that works but thing is bothering me is why the windows and heater blower doesn't work

[Geeman]

Without getting into the whole chrome bumper / convertible story, the convertibles kept their chrome bumpers right up to '91 in some cases, so you can't tell what phase they were in purely from the cosmetics... they don't match up with the saloon variants...

Try the other clocks and see if they work then. Fingers crossed.

Giles.

[fowler]

cheers mate any i deas on the other problems as help will much appriated

[Jimbob]

yo fowler,

i got the same prob with the blowers, with autumn/winter fast approaching i wouldnt mind getting these sorted.

Can have the ignition in pos 2 and blowers work..get the engine turning over and they go away windows work fine tho!

[fowler]

well if i find the problem iwill give you a shout jim not today pissing down with rain

[Martinaston]

As long as there both motronic cars the clocks should have a coding plug on the front. With the L-jetronic managment i think there is a plastic pin in the back that is pulled out and inserted at a different angle but if you have that the engine would not just plug in.

I suspect all the problems are related to the wrong relays being in place and not operating part of the power circuits that feed the car loom. (not just the ones in the fuse box, the ones next to the AFM as well)

Does any of the car's have any extra equpment? (check control)

[fowler]

the car that i took the engine out of was a South African import and it had aircon on this car that was the only difference between them
Regards Ben
Thinking about it the 325 donor had a extra relay in the fuse box

[TOURINGDADDY]

he he he he he he u broke it......................

[fowler]

you git TD

[fowler]

bump any more ideas thanks ian332isport for his input

[TOURINGDADDY]

bump 2

[fowler]

hola persons any help

[Quaser]

Could the SI board have gone as a coincidence?

Q

[fowler]

no as all the other gauges work correctly Q
plus the service light is in the same place i left on the old engine
Regards
Ben

[irish320i]

i had the same problem with my 316 wwhen i changed it to a 320 the fan and windows would nt wok the windows would work on the door was difficult to close after pulling away from a toll bridge ended up doing a small bith of rewiring on my fuse board everything works fine now

[touring170]

hi guys i changed my 2.0 to 2.5 and there is absolutely no difference between them as long as it`s from the same year ie 82-87 and 88-91 all you need to do is keep the original wiring loom and just change the engine nothing else and all should be ok i did and my clocks and everything still works no probs?

[Jimbob]

cue Brianmooooore

(hope you had a good holiday chap)

[Brianmoooore]

Oh well, looks like I've been spotted.
Blower works from unloader relay K7, and the windows/roof (door closed) work from unloader relay K6. The common link between these two is the black/green wire which goes from pins 85 of each relay through pin 15 of the C101 to the unloader terminal of the starter motor (The smallest of the four terminals).
This wire is earthed through the motor winding, but when the starter motor is engaged, this terminal rises to 12V (from the battery via the solenoid and starter switch) and the two relays drop out, stopping the fan and windows while the engine is cranking.
Somewhere in your conversion you've got this wiring wrong.
For E30 related holiday details, see (very) long post coming shortly.

[fowler]

thank you mr moore this is my starting point
would it be different between the two models pre and post face lift

[Brianmoooore]

Don't know much about pre facelift wiring I'm afraid.
The simplest solution would be to open up the fusebox, cut the black/green wire a few inches from the relays and solder it to an earth point, such as pin 85 of relay holder K6. (In my previous post, K6 should have read K5).
Don't forget to disconnect the other end of the black/green wire, or insulate the cut end in the fusebox.

[e30325tony]

hello everyone, nice to speak to some fellow e30 owners!!

im from carshalton area and i got a 318 with a 325 conversion,

now everything is fine except some weird things going with the windows and blowers (similar to above!)

i cannot find the problem tho! ive fiddled with all the fuses and relays i can see!
what seems to happen is when u get in and start the car, sometimes the windows do not illuminate (switch) and the blower doesnt work.

to fix this, i have found that if i were to boot it in 1st or 2nd hard to past 4k everything springs back to life again, usually till i switch it off. but has happend once or twice while i was driving. the blowers and windows usually come on/off together but there has been the odd occasion where ive had one but not the other (cant remember which way around tho)

when the windows dont illuminate i can still use the electric windows if i open a door. but seems to attract attention when im going down a road doing about 30 with me door open

i would really appreciate it if someone knows how i can sort it (its not the blue relay ive swapped it with one of bmws employees (very kind ppl) but it did the same thing.) as i dont normally get to use the internet much if someone is able to email me with how to sort it i would be very greatful

thanks - Tony ppe1700@yahoo.com

[zaust]

sounds like the loom to me.

there are slight differences and they do cause weird probs..