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by Brucey
Mon Nov 12, 2018 9:24 pm
Forum: Engine - Mechanical - Electrical
Topic: m635 Exhaust options
Replies: 49
Views: 5134

Re: m635 Exhaust options

that is a bit disappointing. Even so I would warrant that they were still much better than the average cheap crap on ebay.....?

cheers
by Brucey
Mon Nov 12, 2018 10:56 am
Forum: Engine - Mechanical - Electrical
Topic: m635 Exhaust options
Replies: 49
Views: 5134

Re: m635 Exhaust options

FWIW I bought a set of Fritz's headers (in fact a full system) for my M30 about fifteen years ago and the flanges were welded as per the M88 set you have just bought. I guess since I bought mine they have started to make the M30 headers differently (i.e. 'welded all round') but they have continued t...
by Brucey
Sat Nov 10, 2018 10:57 pm
Forum: Engine - Mechanical - Electrical
Topic: Need help. Engine Ground Straps
Replies: 5
Views: 130

Re: Need help. Engine Ground Straps

in fairness you can make a flying ground lead and try it in various places to see if it makes a difference or not. I suspect it won't make any difference and it if does, it signifies that you have a problem elsewhere, but there is no harm in trying...?

cheers
by Brucey
Tue Nov 06, 2018 11:01 am
Forum: Engine - Mechanical - Electrical
Topic: Need help. Engine Ground Straps
Replies: 5
Views: 130

Re: Need help. Engine Ground Straps

I think the answer is 'probably not', as it applies to motronic models manufactured from mid 1980 until 6/87. The reason I say this is that there is a large earth strap connecting the engine to the body, without which the starter motor won't turn. Making sure that the earths (see ETM for locations) ...
by Brucey
Tue Nov 06, 2018 9:03 am
Forum: Engine - Mechanical - Electrical
Topic: m635 Exhaust options
Replies: 49
Views: 5134

Re: m635 Exhaust options

DRPM. What was the source for those headers ? Will they clear engine mount/control arm mount/steering box for RHD ? they look like fritz's manifolds to me, http://www.fritzsbits.co.uk/exhausts-manifolds so yes they are designed to clear the RHD steering box arrangement. ...Mine too had joined flang...
by Brucey
Mon Nov 05, 2018 3:32 pm
Forum: Engine - Mechanical - Electrical
Topic: Auto trans filter/fluid change
Replies: 3
Views: 61

Re: Auto trans filter/fluid change

if you take that view, you inevitably wait until the gearbox is broken, and/or the oil is the colour of treacle before you do anything about it. My view is that if you have seen the state of a filter and the magnets in the bottom of an autobox, you would not for a moment consider leaving it alone an...
by Brucey
Sun Nov 04, 2018 7:07 pm
Forum: Suspension - Steering - Brakes
Topic: Tired of lowered car
Replies: 7
Views: 189

Re: Tired of lowered car

FWIW if you try to use lowering springs but adjusted to give near-standard ride height (via perch adjustments or packing at the front), you need to be careful that you don't end up with the spring going coilbound in bump; it is pretty much touch and go at the back with a standard setup and a lot of ...
by Brucey
Fri Nov 02, 2018 12:04 am
Forum: Suspension - Steering - Brakes
Topic: Bilstein sieze up question
Replies: 2
Views: 85

Re: Bilstein sieze up question

if you are stupid enough to run the fronts in wet weather without dust boots, water gets into the bushings and can cause them to seize.

Boots are not optional on front bilsteins; they need to be intact, well secured at the top, and fitted to the correct nylon piece at the bottom.

cheers
by Brucey
Thu Nov 01, 2018 9:04 am
Forum: Engine - Mechanical - Electrical
Topic: which computer drives the Check Engine light
Replies: 12
Views: 197

Re: which computer drives the Check Engine light

good result about the crank sensors! Starting and dying after a few seconds are signs that the CSI is working but the main injectors are perhaps not. Worth just checking that the main injectors are actually opening when they see the signal. If they are clicking when the signal is applied this is a g...
by Brucey
Wed Oct 31, 2018 6:08 pm
Forum: Engine - Mechanical - Electrical
Topic: which computer drives the Check Engine light
Replies: 12
Views: 197

Re: which computer drives the Check Engine light

again, it is called a REF sensor. In the workshop manual the horizontal axis is indicated as being calibrated in ms.

I have asked this before; have you tested the feed to the coil under load?

cheers
by Brucey
Wed Oct 31, 2018 12:28 pm
Forum: Suspension - Steering - Brakes
Topic: Tired of lowered car
Replies: 7
Views: 189

Re: Tired of lowered car

this photo shows the difference in sports and HD shocks at the rear http://82.78.8.129/mye28/trailing_arms/Bilstein_rear_Sport-vs-HD.jpg from this it is quite clear that the sports shocks can be used with standard springs and indeed offer a wider range of ride height adjustment. The only thing that ...
by Brucey
Wed Oct 31, 2018 11:54 am
Forum: Suspension - Steering - Brakes
Topic: Tired of lowered car
Replies: 7
Views: 189

Re: Tired of lowered car

since the damping rates are similar between the sports and HDs you might was well try the new springs with the extant shocks. You probably need new (internal to the insert at the front) bump stops anyway, so you could choose those to match the new ride height better anyway. The big differences betwe...
by Brucey
Tue Oct 30, 2018 8:37 pm
Forum: Engine - Mechanical - Electrical
Topic: which computer drives the Check Engine light
Replies: 12
Views: 197

Re: which computer drives the Check Engine light

it is not (on pre 6/87 cars) strictly a cylinder ID sensor, it is effectively a TDC sensor. In BMW/Bosch speak it is the 'REF sensor'. The injectors fire every turn of the engine (so twice per combustion cycle) and are 'batch fired' i.e. all six at once. The only way the engine identifies a cylinder...
by Brucey
Tue Oct 30, 2018 9:00 am
Forum: Engine - Mechanical - Electrical
Topic: which computer drives the Check Engine light
Replies: 12
Views: 197

Re: which computer drives the Check Engine light

if the 'check' light appears in the dash it means that a) you have not pushed the brake pedal yet (which tests the brake lights) and/or b) one of the things in the check panel (to the side of the dashboard) has failed its check. There will be an LED to say which one. This system is entirely passive,...
by Brucey
Tue Oct 30, 2018 8:56 am
Forum: Engine - Mechanical - Electrical
Topic: No Spark but all ECU inputs look right
Replies: 8
Views: 179

Re: No Spark but all ECU inputs look right

have you tested the various 12V feeds to be sure that they hold up under load? A bad contact can show 12V on a DMM but be nigh-on useless when you actually draw current. It is basically the same deal with ground connections too.

cheers
by Brucey
Mon Oct 29, 2018 1:42 pm
Forum: Engine - Mechanical - Electrical
Topic: Blown headgasket
Replies: 10
Views: 235

Re: Blown headgasket

I was wondering if you could get as far as working on the head and manifolds (eg using an engine crane or just laid upside down on a piece of wood) off the engine but still in the engine bay, whilst you enjoy better access to the lower inlet manifold nuts.....? Never done it, but might try that if I...
by Brucey
Sun Oct 28, 2018 10:19 am
Forum: Engine - Mechanical - Electrical
Topic: Timing Specs 77/78 M90 635CSi EURO
Replies: 7
Views: 220

Re: Timing Specs 77/78 M90 635CSi EURO

there is quite a lot of useful info on this in the E12 Haynes manual; the same engines are used and there are various different distributors and therefore target rpms. Normally there is a 'knee' in the advance curve and this represents the position where the soft spring on the bob weights taps out a...
by Brucey
Sat Oct 27, 2018 2:40 pm
Forum: Engine - Mechanical - Electrical
Topic: Non runner...l1984 635csi UK Euro model end Vin 8185999
Replies: 5
Views: 151

Re: Non runner...l1984 635csi UK Euro model end Vin 8185999

crank sensor at the front of the engine is not involved in the normal running of the engine, in any way whatsoever. This is only connected to the diagnostic post and it is only ever used when someone plugs a BMW service computer into the diagnostic port. pre 6/87 cars have a cold start injector and ...
by Brucey
Sat Oct 27, 2018 2:33 pm
Forum: Engine - Mechanical - Electrical
Topic: Blown headgasket
Replies: 10
Views: 235

Re: Blown headgasket

I think the change occurred 6/87 and coincided with the move to the B35 motor. These engines have a different inlet manifold, no CSI, and a few other changes.

Perhaps it is possible to remove the head with the inlet manifold attached, complete with wiring harness?

cheers
by Brucey
Fri Oct 26, 2018 9:15 am
Forum: Engine - Mechanical - Electrical
Topic: Modified throttle bodies survey/thoughts
Replies: 8
Views: 269

Re: Modified throttle bodies survey/thoughts

I would be interested in knowing if this either makes for a meaningful increase in power by itself, or is more of an 'enabler' so that you get more value out of other tuning changes. Everything makes a difference of course (all the flow resistances adds up) but the single biggest restriction is the ...
by Brucey
Fri Oct 26, 2018 9:05 am
Forum: Engine - Mechanical - Electrical
Topic: Blown headgasket
Replies: 10
Views: 235

Re: Blown headgasket

clearance to these nuts varies between models because the size/shape of the intake runners is different depending on model. IIRC I used a 1/2" full hex socket, 1/4" drive, thin walled, with a wobble bar. ISTR that being 'the wrong size' it slipped over the nuts at an angle (unlike a 12mm one) but al...
by Brucey
Thu Oct 25, 2018 10:09 pm
Forum: Engine - Mechanical - Electrical
Topic: Magnet oil filter- DIY style -updated
Replies: 32
Views: 10875

Re: Magnet oil filter- DIY style -updated

looks good!

I wouldn't be at all surprised if you harvest quite a few particles after just a few hundred miles.

cheers
by Brucey
Thu Oct 25, 2018 10:06 pm
Forum: Engine - Mechanical - Electrical
Topic: Weird idle on cold start
Replies: 11
Views: 423

Re: Weird idle on cold start

IIRC the TB gap ought to be 0.5mm, i.e. 0.020".

If it doesn't idle slowly enough with this TB gap it usually means the ICV isn't working/ is jammed open and/or there is a massive air leak.

cheers
by Brucey
Thu Oct 25, 2018 8:12 pm
Forum: Engine - Mechanical - Electrical
Topic: Non runner...l1984 635csi UK Euro model end Vin 8185999
Replies: 5
Views: 151

Re: Non runner...l1984 635csi UK Euro model end Vin 8185999

if you have spark and fuel pressure the engine should fire on the cold start injector during cranking, even if the main injectors are not working for some reason . So check that the cold start injector system is working; see workshop manual for details, but it is a simple system in which the CSI is ...
by Brucey
Thu Oct 25, 2018 9:50 am
Forum: Engine - Mechanical - Electrical
Topic: No Spark but all ECU inputs look right
Replies: 8
Views: 179

Re: No Spark but all ECU inputs look right

no voltage at the coil means the feed from the main relay is bad. You need to sort that out, else the car will never go.

cheers