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by Brucey
Mon Jan 14, 2019 11:47 pm
Forum: Engine - Mechanical - Electrical
Topic: TPS Test / Adjustment for a 1988 Auto 635csi
Replies: 6
Views: 680

Re: TPS Test / Adjustment for a 1988 Auto 635csi

you almost certainly need to reset the throttle butterfly and then the TPS, in that order , according to procedures described in the manual. The throttle body linkage wears over time and this results in the butterfly being too far closed at idle, even though nothing has been adjusted. The ICV ends u...
by Brucey
Sun Jan 13, 2019 2:02 pm
Forum: Engine - Mechanical - Electrical
Topic: Rough Idle, dies on slight throttle - with video for diagnosis.
Replies: 18
Views: 1524

Re: Rough Idle, dies on slight throttle - with video for diagnosis.

relevant part numbers are all visible without disassembly.


Spending any time thinking about MAF conversions etc whilst you still might have a basic fault of some kind is, IMHO, utter madness.

cheers
by Brucey
Sat Jan 12, 2019 1:11 pm
Forum: Engine - Mechanical - Electrical
Topic: Looking for help "hunting idle" at cold start "surging idle" at warm start
Replies: 6
Views: 453

Re: Looking for help "hunting idle" at cold start "surging idle" at warm start

you need to reset the throttle body and then the TPS, as per the manual, in that order.

cheers
by Brucey
Sat Jan 12, 2019 12:57 pm
Forum: Engine - Mechanical - Electrical
Topic: Rough Idle, dies on slight throttle - with video for diagnosis.
Replies: 18
Views: 1524

Re: Rough Idle, dies on slight throttle - with video for diagnosis.

cause and effect are not easy to discriminate here; poor running causes plugs to go black and sooty but that plug is so fouled that it might in itself cause problems... A few cold starts and short runs in a row (even with a healthy car) will cause the plugs to go as black as hades like that. Still d...
by Brucey
Wed Jan 02, 2019 12:11 am
Forum: Engine - Mechanical - Electrical
Topic: Rough Idle, dies on slight throttle - with video for diagnosis.
Replies: 18
Views: 1524

Re: Rough Idle, dies on slight throttle - with video for diagnosis.

it would have been running lean (open loop) with a 2.5bar FPR instead of a 3.0bar FPR. This could perhaps be adjusted out at idle but not at part throttle. If the engine runs closed loop (with an O2 sensor) then it ought to run OK (ish) once warmed up. The exhaust can still go black; if you get a le...
by Brucey
Sat Dec 29, 2018 6:46 pm
Forum: The Saloon
Topic: Get Well Soon, Ron
Replies: 48
Views: 3121

Re: Get Well Soon, Ron

thank goodness for that.

get well soon Ron!

cheers
by Brucey
Sat Dec 29, 2018 9:57 am
Forum: Engine - Mechanical - Electrical
Topic: Rough Idle, dies on slight throttle - with video for diagnosis.
Replies: 18
Views: 1524

Re: Rough Idle, dies on slight throttle - with video for diagnosis.

the other thing that might have happened is that that new fuel/injector cleaner has caused deposits inside the fuel lines to be softened/released. This could have blocked any filter, including the tiny ones on the back of the injectors themselves. BTW from 6/87 onwards 635CSi was fitted with M30B35 ...
by Brucey
Thu Dec 27, 2018 1:45 pm
Forum: Exterior
Topic: VIN number location on an 85 635CSI
Replies: 4
Views: 517

Re: VIN number location on an 85 635CSI

csi24 wrote:
Mon Dec 24, 2018 11:25 am
There is yeah, car is from US, but I need an actual stamped VIN in the body, plate is easily transferable
RHD car from the US...? That's a bit weird?

cheers
by Brucey
Thu Dec 27, 2018 9:57 am
Forum: Engine - Mechanical - Electrical
Topic: Windshield Wipers Jumping
Replies: 12
Views: 2197

Re: Windshield Wipers Jumping

both the spindles and the bushes can wear so when rebuilding it is best if you prepare yourself for new parts (or new bushings turned up on a lathe) or something. It is best if you do everything together but overhauling the motor/gearbox is a benchtop job (the motor/gearbox comes out without having ...
by Brucey
Sun Dec 23, 2018 1:58 am
Forum: Engine - Mechanical - Electrical
Topic: Is this an M30 or M90?
Replies: 15
Views: 1160

Re: Is this an M30 or M90?

that car is a 'series 1' car and (like all built before 5/82) is a somewhat different animal to those built after that date. It should have a 3.5 litre engine with a wide bore and a short stroke configuration which is often called an M90 (although in fact it is a type of M30). At that build date wit...
by Brucey
Thu Dec 20, 2018 9:21 pm
Forum: Interior
Topic: OBC Removal to Install New LED Light Bar
Replies: 20
Views: 1078

Re: OBC Removal to Install New LED Light Bar

LED light is polarized. It shines brighter in one plane than another, although it may appear to shine equally in all directions to the naked eye. I'm not sure this is correct; if it were then a) this wouldn't have been news https://www.laserfocusworld.com/articles/print/volume-44/issue-5/world-news...
by Brucey
Thu Dec 20, 2018 9:00 pm
Forum: Engine - Mechanical - Electrical
Topic: Windshield Wipers Jumping
Replies: 12
Views: 2197

Re: Windshield Wipers Jumping

erratic wipers could be a dodgy switch but IME it is just as (if not more) likely that the gearbox is full of dried grease and/or the linkage is worn. If the spindles are moving around there is only one cause for this; the spindle bushings are worn and need to be rebuilt/replaced. Yes there are seal...
by Brucey
Tue Dec 18, 2018 8:19 am
Forum: Engine - Mechanical - Electrical
Topic: 1980 633CSi No Spark
Replies: 23
Views: 1436

Re: 1980 633CSi No Spark

Where is the combo relay? Sometime in the last 12 years someone decided to throw away the fuse box cover I bought so we do not have a diagram of what fuse/relay is what. there isn't a diagram on the lid anyway, so you are missing nothing here. The fuse and relay allocations are given in the owner's...
by Brucey
Tue Dec 18, 2018 8:12 am
Forum: Engine - Mechanical - Electrical
Topic: 1980 633CSi No Spark
Replies: 23
Views: 1436

Re: 1980 633CSi No Spark

I think I meant what I said; this is an L-jet car remember. The distributor looks a lot (and works a lot) like one that you might find on an older engine with carburettors, not like the motronic distributor. https://www.wallothnesch.com/media/catalog/cache/9_1205_800_564.jpg The base of the distribu...
by Brucey
Mon Dec 17, 2018 9:52 pm
Forum: Engine - Mechanical - Electrical
Topic: 1980 633CSi No Spark
Replies: 23
Views: 1436

Re: 1980 633CSi No Spark

Question for Brucey, what is the "low tension side of the distributor"? I can only think of the small connector with one green wire going to it, don't know where it comes from, however [-( the small green wire has several cores and provides the timing signal for the whole engine to run; it won't ru...
by Brucey
Mon Dec 17, 2018 8:51 pm
Forum: Engine - Mechanical - Electrical
Topic: 1980 633CSi No Spark
Replies: 23
Views: 1436

Re: 1980 633CSi No Spark

the front crank sensor (on all E24 built pre 6/87) is only connected to the diagnostic port, i.e. it plays absolutely no role in running the engine. It is only there at all so that a BMW service tool can be plugged into it and the correct timing settings etc quickly verified during a service. You co...
by Brucey
Mon Dec 17, 2018 6:46 pm
Forum: Engine - Mechanical - Electrical
Topic: 1980 633CSi No Spark
Replies: 23
Views: 1436

Re: 1980 633CSi No Spark

on Motronic cars there is a wire that runs from the starter motor to the ECU (pin 4 from memory). This gives a 'start' signal without which the ECU won't produce sparks, as a safety provision. The ECU also controls the fuel pump. Your car is L-jet. I don't know of all the safety provisions on this s...
by Brucey
Mon Dec 17, 2018 12:25 pm
Forum: Engine - Mechanical - Electrical
Topic: Thermostat housing stamped 3.1? Which stat do I need?
Replies: 14
Views: 2296

Re: Thermostat housing stamped 3.1? Which stat do I need?

it seems like you have a result! FWIW you should find the fuel consumption a bit improved; the difference would be even greater with a non-cat car.

cheers
by Brucey
Mon Dec 17, 2018 10:16 am
Forum: Engine - Mechanical - Electrical
Topic: Getrag Transmission Numbers.... Again
Replies: 4
Views: 414

Re: Getrag Transmission Numbers.... Again

in 1981 the default manual transmission on a 635CSi would have been an overdrive 5s gearbox (Getrag 265/6, with detachable bellhousing) paired with a 3,07 diff. This has a standard (i.e. fifth gear offset) shift pattern, and the net gearing means that if you could pull the (overdrive) top gear, the ...
by Brucey
Sun Dec 16, 2018 10:25 am
Forum: Engine - Mechanical - Electrical
Topic: Thermostat housing stamped 3.1? Which stat do I need?
Replies: 14
Views: 2296

Re: Thermostat housing stamped 3.1? Which stat do I need?

I looked into this years ago and I think this is what you need to know …..A further wrinkle on the M30 is the thermostat itself; ~1985 onwards, the housing has an 'A' marking near the joint face and accepts a different thermostat (11 53 1 713 040) than the previous version (11 53 1 254 065). Some ea...
by Brucey
Sun Dec 16, 2018 1:21 am
Forum: Suspension - Steering - Brakes
Topic: power steering sump wet
Replies: 2
Views: 517

Re: power steering sump wet

the level in the system may be too high. Very commonly folk check it and top it up not using the prescribed method. (*). a) To check the level properly (as per the owner's manual); turn the engine off and fully depress the brake pedal about twenty times. When the stored pressure/fluid in the system ...
by Brucey
Fri Dec 14, 2018 1:02 pm
Forum: Suspension - Steering - Brakes
Topic: Losing Brake Pedal When Engine Running
Replies: 67
Views: 4921

Re: Losing Brake Pedal When Engine Running

no overpressure valves in hydraulic braking systems....

cheers
by Brucey
Thu Dec 13, 2018 11:30 pm
Forum: Interior
Topic: OBC Removal to Install New LED Light Bar
Replies: 20
Views: 1078

Re: OBC Removal to Install New LED Light Bar

photo?

cheers
by Brucey
Thu Dec 13, 2018 3:41 pm
Forum: Suspension - Steering - Brakes
Topic: My "Solution" for no Bilstein Sports for E12 based Cars
Replies: 5
Views: 670

Re: My "Solution" for no Bilstein Sports for E12 based Cars

IIRC the shock body is ~50mm dia (once the perch is off) and this is of a size that will fit up the headstock of a decent sized lathe (with suitable packing to stop it from flapping about if necessary), which means that the shock shaft can be held in a chuck so that the part you need to work on is e...
by Brucey
Thu Dec 13, 2018 3:20 pm
Forum: Engine - Mechanical - Electrical
Topic: 86 635CSI engine randomly cuts out
Replies: 16
Views: 3608

Re: 86 635CSI engine randomly cuts out

they are indeed the same pn and are just labelled differently when installed in the car, so you don't get them mixed up. It could indeed be a dodgy sensor (the one you didn't replace before, of course....) but as with any intermittent electrical issue the trick is to catch it definitely not working ...