One for the S50 guys

[bigpimpin]

OK, I'm up and running but have a slight spluttering/hesitation when the throttle remains in one position, ie. constant speed in any gear. As soon as you accelerate/decelerate it goes away.

I fitted the evo pump last week so shouldn't be fuel unless there are any inline filters under the car.

It's like when a carburetted car has a bit of crap stuck in the carb.

I have a spare set of coil-plugs that I may swap in to see if that cures it.

? any ideas?

[GermanGorilla]

Hi,

Not sure, but could be a fueling issue, but you say
engine is fine when you accelerate, so as the fuel pressure is around
5 bar plus, it sounds more of a 'contact' issue.

Coil Packs could cause it, DME / ECU not fitted tightly,
what air filtre are you using ? is it nice and new, or nice and
clean ?

Or maybe a sticky injector ?

It would be hard sat here to say, right its this or that, I would
play around with one item and a time test/check and then do the next.

Boring I know, but it tends to work !!!

Hope this helps,

Regards,

The Gorilla.

[Demlotcrew]

Best thing is to visit someone with a diagnostics machine and pay the £30 odd they might charge to find out what the problem/s are.

Andrew

[buster]

Best thing is to visit someone with a diagnostics machine and pay the £30 odd they might charge to find out what the problem/s are.

Andrew

only problem with that is unless you wire in the original m3 cluster i dont think it will work.I know Ian said he has a multiplug so that he can plug a set in for this reason.

[Turbo-Brown]

Wouldn't be something simple and crap like the throttle posision sensor would it?

[bigpimpin]

I did connect the violet/white wire to the diagnosic port as per ian's instructions so maybe that will do.

I'll try swapping the coils this week if I get a chance.

[jaistanley]

Good job I read this.. I'll need to wire the diagnostics in for just this reason; sod trying to diagnose problems on a modern engine management system!

Jai

[buster]

I did connect the violet/white wire to the diagnosic port as per ian's instructions so maybe that will do.

I'll try swapping the coils this week if I get a chance.

which pin is that sandy ?
I just followed Ians charts,only 2 pins not used in my c101 connector so hopefully ive got em wired in.

[ian332isport]

I did connect the violet/white wire to the diagnosic port as per ian's instructions so maybe that will do.

I'll try swapping the coils this week if I get a chance.

Hi Sandy,

I don't recall anything about adding a wire to the diagnostic socket.

I think you may mean running the white/violet wire from the diagnostics socket (pin 20 - already fitted) through the C101 connector (pin 17) to the EWS module.

Regarding the hesitation. Could be plugs, MAF, throttle pot or even an air leak. The throttle pot is a service item (every inspection 2), so may be worth a try, and the MAF is also cheap/easy (assuming you have a spare from the other engine).

Best thing is to visit someone with a diagnostics machine and pay the £30 odd they might charge to find out what the problem/s are.

Andrew

only problem with that is unless you wire in the original m3 cluster i dont think it will work.I know Ian said he has a multiplug so that he can plug a set in for this reason.

You would be able to use the diagnostics, but without the cluster attached, you can't align the EWS if it ever needed replacing.

Cheers,

Ian.

[bigpimpin]

Hi Ian, yeah that white/violet wire is the one that i'm on about. Does this mean it can be plugged into a diagnostic machine?

Unfortunately I don't have a spare MAF, I can't find the "throttle pot" on realoem?

Is there an inline fuel filter on the e30? If there is I was thinking the increase in fuel pressure from the new pump may have dislodged some crap in it.

[ian332isport]

Does this mean it can be plugged into a diagnostic machine?

Yes, can be diagnosed as if it was still in the M3.

Unfortunately I don't have a spare MAF, I can't find the "throttle pot" on realoem?

Item 8.

http://www.realoem.com/bmw/showparts.do ... g=13&fg=15

Is there an inline fuel filter on the e30?

Yes, it's normally mounted just in front of the passengers side rear wheel.

Cheers,

Ian.

[Turbo-Brown]

And if anyone wants a S50B32 MAF sensor, I've got a brand new one straight from BMW (actually it's been connected for the sum total of about 1 hour) which is surplus to requirements now I'm not intending to use the original engine management.

How cheeky was THAT?!

[ian332isport]

And if anyone wants a S50B32 MAF sensor, I've got a brand new one straight from BMW (actually it's been connected for the sum total of about 1 hour) which is surplus to requirements now I'm not intending to use the original engine management.

How cheeky was THAT?!

What sort of money are you looking at ?

I may be interested myself.

Cheers,

Ian.

[Turbo-Brown]

Just sent you a PM Ian

[bigpimpin]

Ian, is the throttle pot serviceable or is it just a replacement job?

I had it out for a blast last night again (it gets the adrenaline pumping ). The more I think about it, it must be something like that "pot" cause if it was fuel it wouldn't take throttle.

It'll probably be into next week before I get a chance to play with it.

By the way, i'm not forgetting about that air con pump, i'll get a pic to you soon.

[bigpimpin]

Ian, ignore me, my brain has been fried!

I have a spare pot on the original motor I can try !

[ian332isport]

Ian, is the throttle pot serviceable or is it just a replacement job?

I had it out for a blast last night again (it gets the adrenaline pumping ). The more I think about it, it must be something like that "pot" cause if it was fuel it wouldn't take throttle.

It'll probably be into next week before I get a chance to play with it.

By the way, i'm not forgetting about that air con pump, i'll get a pic to you soon.

Hi Sandy,

Throttle pot is a replacement job. BMW specify every inspection 2 for these. There's no setup or adjustment. Just pop it on and off you go.

I'm glad you're enjoying it. It's a superb conversion when done right, and really suits the car. I find the chassis takes the power very well

No probs on the Aircon compressor. Mine is still working, so no big rush. It's just that it makes a little more noise than I think it should be.

Cheers,

Ian.

[bigpimpin]

Well, its not the pot cause I swapped over the old one and problem still there.

I'll try the plugs next and get another fuel filter cause that wont go amiss.

[stevetigger]

I would say MAF

[bigpimpin]

Is there a visual inspection you can do on the AFM to check if its faulty?

Don't like the look of the stealer prices !

[ian332isport]

Is there a visual inspection you can do on the AFM to check if its faulty?

Don't like the look of the stealer prices !

Hi Sandy,

No visual check that I'm aware of, but you can clean them with a squirt of carb/brake cleaner. No guarantee this will fix the problem, but it's easy to do and cheap.

Cheers,

Ian.

P.S. I may possibly have a spare one soon, and you are welcome to give it a try.

[bigpimpin]

I changed the Fuel Filter but no joy, I then removed the AFM and gave it a blast with brake cleaner. At the same time I adjusted the throttle pedal stop as I didnt think it was getting full throttle.

Result = Jesus! its like having an extra 100BHP!

So, spluttering gone, but then I thought....did I connect up the AFM plug?

Got home and no i hadn't connected it up!?

How can it run great with out it connected? I didnt take it out again after I reconnected it so don't know if it will re introduce the spluttering.

I'm confused?

[ian332isport]

How can it run great with out it connected?

Sandy,

I believe it defaults to a fixed base map when it detects one of it's main sensors is fauty (or missing in this case). It would probably be running a bit like an Alpha-N system on throttle angle and RPM only.

Cheers,

Ian.

[buster]

How can it run great with out it connected?

Sandy,

I believe it defaults to a fixed base map when it detects one of it's main sensors is fauty (or missing in this case). It would probably be running a bit like an Alpha-N system on throttle angle and RPM only.

Cheers,

Ian.

Is this good or bad ?
Can it run permanently without it ?

[ian332isport]

How can it run great with out it connected?

Sandy,

I believe it defaults to a fixed base map when it detects one of it's main sensors is fauty (or missing in this case). It would probably be running a bit like an Alpha-N system on throttle angle and RPM only.

Cheers,

Ian.

Is this good or bad ?
Can it run permanently without it ?

It would not be running at max potential as it would be guessing on the amount of air entering the car. The base map would only be there as a 'get you home' sort of thing and would probably be running on the rich side to safeguard the engine.

It's also possible that it will limit revs etc, but I have no info on this side of things.

In general, it's bad to run without it connected.

Ian.

[GermanGorilla]

Hi,

Me thinks Buster wants to know so that he can run his
Carbon Airbox without the MAF connected ?

The Problem with running a Carbon Airbox that was made for
an E36 engine bay, in an E30, is that it sticks far forward
gets obstructed in part by the ABS Pump,
and the MAF when fixed onto the front leaves no room for
some type of air filtre ?

And if you cut back the front intake part of the Carbon Airbox
so as to have enough room for a filtre then it more or less destroys
the first part of the Box and is pointless.

The only way of deleting the MAF is to run an Alpha N type set up
which allows the correct air/fuel ratio but without using the MAF.

Ian322 is correct about the ECU defaulting when the MAF is disconnected
and it rev limits and runs rich to try and prevent engine damage.

Regards,

The Gorilla.

[bigpimpin]

Well, I connected up the MAF today and took it for a spin.....the spluttering has returned so that confirms its the MAP thats causing it. WRT running with it disconnected, I didnt notice any reduction in revs.

Anyway the above replies have answered the question I had "Can it run without it" so looks like i'm on the hunt for another AFM.

[ian332isport]

Sandy,

I'm getting a MAF from Alex (Turbo Brown) to see if it shifts a flat spot I have. If the MAF makes no difference then I'll have a spare

Ian.

[GermanGorilla]

Hi,

Ian332 - These engines are well known for a flat spot, either
just off idle as the throttle is depressed they sometime's miss,
more noticable when the engine is warm.

The second known flat spot sometimes occurs around 3500-4000 rpm
as it sort of delays slightly just before the Vanos is due to open at
around 4500 rpm.

I think you will have more chance having it removed by a good session
on a rolling road and good remap of the standard ECU /DME.

One way of testing, is to take out both the plastic MAF sceens, they are held in by spring clips, which then allows about 10% more airflow through
the MAF, with them removed the ECU up's the fueling to compensate
for the greater airflow.

The engine will miss a little just after intial pickup,
but should then rev cleanly all the way to the Red Line.

If this happens, then a remap is the only way of resolving it.

Hope this helps.

Regards,

The Gorilla.

[ian332isport]

My flat spot is around 2500 to 3000 rpm (hot or cold). After this, it really flies.

Ian.

[bigpimpin]

10% more airflow? Looks like this will be my next mod!

They're pretty pointless anyway cause no shit would be past the filter.
Unless they are to spin the air about or something?

Ian, I'll wait to hear if you need that AFM.

There is a guy just up the road from me that has a Chipped UK franchise so I might pay him a vist when I've sorted the spluttering. I'll be sick paying him though as the bugger got in just before me as I wanted to do that as a sideline!

I sourcing a new set of rims too cause those 9's out back are rubbing like hell. You can feel the car being held back when accelerating when they rub.

[ian332isport]

Sandy,

I believe the screens are there to help provide a laminar airflow through the MAF. This is supposed to give a more accurate reading, but a 10% increas in airflow is never to be sniffed at

Cheers,

Ian.

[stevetigger]

My maf's not working either!

Drove with it unplugged today, ran the same but better tick over! But the annoying EML was on!

[ian332isport]

As an experiment, I tried my car with the MAF disconnected today. It runs, but is definately down on power without it. It felt quite flat and lifeless.

It's hard to say if it improved the flat spot at all, but I'll be very interested to see if the new MAF makes a difference.

Ian.

[Turbo-Brown]

Has it turned up yet Ian?!