E34 M5 anus blue 16/9/14

[Simon13]

yeah i saw it earlier, its very tempting. it would work with the blue paint. hmmmm

[pacerpete]

Sad Jan is up for serving his spare extended champagne leathers , he said he would exhume it over the next week or so. Much nicer than that murky looking tat.

[bss325i]

What about those comfort velours Pete?

[Simon13]

So she ran well for 3 days and today back to before! rough/lumpy idle. Bogging down when pulling away. And running poorly almost like its missing, i can hear little pops from the exhaust when i lift off the accelerator when coasting in gear. It even did a loud pop when i revved it up in neutral when sat at traffic lights! I can feel it missing under light load. The engine note has changed it clearly sounds different and the performance is flat or the low end torque has gone from before. I've not taken it up 3,000 RPM thought even when warm

All i can think off at the moment now i know my sensors are ok, is MAF, O2 sensor or Camshaft sensor? - It looks like one is fitted to these? I know a crank sensor could give these kind of faults on generally on BMWs when they fail the car just wont start rather than failing gradually. Its clearly a sensor electronic fault i think.

Time to get my plugs out see if a clue can be had here

[Nobby_N]

Time to book it into ML's for the experts to sort it out!

[Simon13]

I pulled the plugs, and on cylinder one she looks lean. The other 5 are a nice golden brown colour. So this would fit my symptoms i think and mean its located as a cylinder specific problem at a guess?

As to what i am unsure

[Jon_Bmw]

Have you got an infra red heat gun? If so check primary temps at say 1000, 2000 and 3000rpm. Note them down.

Hopefully the average reading on one cylinder will be a lot lower...

Move injector from lowest temperature reading to another cylinder. Redo Temp test and see if the problem follows the injector?

[Simon13]

No i haven't got one of them Jon, I've been thinking about refurbing the injectors anyhow, but i did last week out of curiosity remove the plug on cylinder 1. So i've disturbed it last week, changed the sensors and its run well for 3 days solid then started to play up.

An easy test would be another coil? These engines share the same coils as the S50b32 engine luckily

[Speedtouch]

I would run a compression test - you can buy a gauge for about £30 in Halfords. Very handy for checking any petrol engines.

[Jon_Bmw]

You could remove number 1 injector plug to see if the idle remains its same lumpy'self?

Then try putting that one back on and removing a potentially good one to compare the difference. The fact it is intermittent you would hope that rules out low compression on one or more cylinders...

I cannot remember what it is like, does it have a single coil and dissy cap or a coilpack?

[Jon_Bmw]

Another random thought, I think it is possible to get the in-car-temp gauge and ecu temp wiring harness plug on the wrong way around. It gives funny readings like the car is overheating from memory. I doubt that could cause any of your symptoms but it is an easy check. Drivers side of the engine bay IIRC.

[Jon_Bmw]

Worth checking this, or similar on the later models?

http://www.mye28.com/viewtopic.php?t=70491

Symptoms aren't a million miles off.

[darkchild]

Just read Bob Harper's last longtermers report for the Avus chariot and you get a mention. He's pleased it's gone to an enthusiast. Did they give you the option of continuing the running reports?

[Simon13]

Is the new mag out?

No he didn't, i guess i could mention it? but you can read all about it here! Like this annoying running fault it has!!

[darkchild]

I subscribe so tend to get it a few days early.

True, the Zone will provide its own running reports! It would be good to still see it in the magazine though rather than all the repmobile and Skoda Superb reports they feature now.

[pony]

I didn't realise you bought BMW Car magazine's E34 M5 Simon
Isn't that the same one as July 2014 front cover ????
Bring it Surrey Rolling Road yeah ?

[Simon13]

it certainly is, i will if its running healthy and i'm feeling brave

[daimlerman]

Think simple,Simon...

Swap the injectors around/have them to Injector tune first.

[Simon13]

i want to do that also as par the course Malco

[Simon13]

So i've not driven the M5 the past 2 weeks as its been in bits and waiting for parts etc One of things i wanted to check that can cause rough running is where the TB's where all still in sync.



Getting the Inlet off is pretty easy once you've worked it out! I used an online BMW manual for this and after measuring all the TB's like this




so on every TB you measure distance A and B for each cylinder, then you add them all up and divide by 6 to get your mean.

BMW state 23.75mm for A and i had 23.72mm
B is 24.75mm and i had 24.73mm so i left them alone.

I did adjust slightly the throttle linkage rods and cleaned them up






Whilst it was in bits it was a good time to get the injectors cleaned, the flow rate was still nearly spot on but the spray patterns were average so they're all good now.

Also as it wasn't alot of money a new FPR and hose as that was grim. I've got a fuel filter to go on also





Whilst the inlet was off was a good time to replace any nasty/split grim hoses like this one for the oil catch tank to dipstick tube




Plus this one from the rocker to inlet breather. Someone has replaced the small vacum hoses already so a minor result. The little shock was also bust at the base of the inlet. Grinding a slot into it sorted that out





Old air filter was well dirty





I want a new M sticker for the inlet but i bulked at the £29 price!

And back together, i've done it a bit arse about tit but my reasoning is this i know the TB's sync haven't been set with the vacume guage but i've not really changed anything here. So next is to check the valve clearances and then i'll set the TB's with the guage. And i've hopefully attended to any air leaks.

Is the running fault still there? yes, btu really its time to read the fault codes live data now. I've done all i can without the computer

[TPS]

Really good update Simon, where did you get the Injectors cleaned?

[Simon13]

boxer motor works in Ashford Phil, do me a favour and delete one of them posts? Its double posted innit

[Simon13]

Powelly came with the diagnostics this week and plugged her in to reveal a fault code of the O2 sensor variety! Great that causes a running fault like i've got


So yesterday came and i replaced the O2 sensor. Its quite a tricky sensor to change when you only have a long 22mm spanner! A half moon shaped one would do the job nicely




What a cheeky location! I changed the one on my e34 bi turbo in 15 mins start finish on the drive! Not this one





I had to drop the gearbox cross member to get enough space, but anyhow its on and fitted.


Any good? Yes and no, it runs much better but the idle is still rough, the idle speed is still eratic in terms of RPM so varys from 600rpm to 750 say. but does not hunt. It does however drive much better but theres still a hesistation when pulling away and can be jerky on and off the throttle.


Wind forward to today however and i was able to try a known good working MAF off a LHD 3.8 touring and road test it on my car. WOW, idle became perfect, 90% smoothers and at the correct RPMs too. I thought this looks promising and it was a joy to drive, smooth, responsive and pulled and revved very hard in every gear to the 7k no sweat. It felt to me like it should or certainly more like i think this 340bhp peach should when running right. It felt bloody epic and its the first time i've revved it that high so far!

So i'm excited now! Just need to sort a MAF out, i'd rather new than 2nd hand but i'll if getting a new one is possible first.





I've binned this crap off also as the gearnob was doing me head in horrid thing






Also while we are on interiors. On the cards extended champers? Or a nice black leather trim? They both go but champers is more special i think

[M-Sport]

Si was the steering a direct fit?

[jimbom30cab]

Great update there Si, a good read

[Simon13]

twas a straight fit from an e36, they only bolt on the late e34's

[brettski]

Go for Champagne Si.

[Simon13]

hmmm tried this MAF place today, who phoned bosch who are no longer making MAFs for 3.8 M5's now. He said try the main dealer, i said i have and they've said no longer available also. He said oh sorry, great.

Not really on is it? Its not like they didn't build many of these cars.

[jimbom30cab]

Could you use a 4.0 M60 V8 MAF must be very similar i would think?

[DanThe]

pm me the Bosch number and a few pics Si I may be able to help

[Simon13]

Its 0280 214 006 Dan i've not got a pic to hand but the casing is in ali like early Mafs are.

The 540i uses the same motronic 3.3 as the 3.8 M5 but the MAF is different.

[Andyboy]

That E36 wheel looks rank in there, sorry. The old type E36 M Tech 2 wheel fits. Abit ofd wiring for the horn and the airbag light whipped out.......

As for the MAF, iirc the Porsche 928S has the same one...?

If the MAF is wanquered, try sticking it in the dishwasher for a quick cycle - obviously on its own and not with pots and pans. It often works wonders.

I have a big Bosch book here - I'll look at the part number and try to cross reference it.

[Andyboy]

Bugger. It's the 3.6 that uses the 001 MAF from the 928 Porker.

Closest I can find is 0280 214 004 and 0280 214 005 - 1992 onwards V8 Merc.

Here is a 006:
http://romatronic.pl/pl/p/Przeplywomier ... 4-006-/173

And here is a 005 pic:

http://www.yoyopart.com/oem/4298768/bos ... 14005.html

Thankfully, those warm, caring philathropists at BMW can still get you a 006 - a mere £1450.

Otherwise I'd be getting a cheap used 005 and see if that does the trick.

[capri_rob]

Mental. Are there no electronics specialists that can strip, test and repair these at component level ?

[bss325i]

The MAF was meant to have been rebuilt by some outfit in the states but obviously their attempt was futile!

Schrick 284 cams, Alpha N and carbon intake FTW!