I've heard today that its possible to synchronise the injectors on the S38B36. Mine is running good, just a little rough. Will have the valve clearances checked soon, but someone told me that it's also possible that non-synchroniswed injectors cause a slightly lumpy idle.
Anyone know the fact about this synchronising? Who in holland can do this for me?
Maybe it involves the little plastic white caps on the inlet manifold I reckon, that's the only part I can see qualifieing as a adjustment point.
Re: What about this synchronising injectors on 3.6?
Quote:
Originally Posted by Sebring NL
I've heard today that its possible to synchronise the injectors on the S38B36. Mine is running good, just a little rough. Will have the valve clearances checked soon, but someone told me that it's also possible that non-synchroniswed injectors cause a slightly lumpy idle.
Anyone know the fact about this synchronising? Who in holland can do this for me?
Maybe it involves the little plastic white caps on the inlet manifold I reckon, that's the only part I can see qualifieing as a adjustment point.
thanks in advance,
A very happy M5 board user
Wout
I think you might be reffering to throttle bodies and not injectors, as the only way to check the operation of injectors is to take them out and have them sonicaly cleaned and then flow tested to make sure they are within spec.
Re: What about this synchronising injectors on 3.6?
Quote:
Originally Posted by bobz
I think you might be reffering to throttle bodies and not injectors, as the only way to check the operation of injectors is to take them out and have them sonicaly cleaned and then flow tested to make sure they are within spec.
Re: What about this synchronising injectors on 3.6?
I cfan only recommend two things:
1: Have the injectors ultrasonically cleaned by a Bosch service station. Make sure, they also replace the O-rings and the tiny filters.
2: Check the basic throttle adjustment and if necessary, synchronize them.
3: Point two is useless unless the rest of the engine is not 100%. Therefore: a) verify and adjust the valve clearances first; b) replace all vacuum and underpressure hoses; c) Verify the fuel pressure.
The procedure for synchronizing the throttle bodies is complex, but if you are accurate and able to work precise, this is a DIY job. The exact procedure can be found on various internet sites (To complex to summarize).
Re: What about this synchronising injectors on 3.6?
Quote:
Originally Posted by raymond woertman
I cfan only recommend two things:
1: Have the injectors ultrasonically cleaned by a Bosch service station. Make sure, they also replace the O-rings and the tiny filters.
2: Check the basic throttle adjustment and if necessary, synchronize them.
3: Point two is useless unless the rest of the engine is not 100%. Therefore: a) verify and adjust the valve clearances first; b) replace all vacuum and underpressure hoses; c) Verify the fuel pressure.
The procedure for synchronizing the throttle bodies is complex, but if you are accurate and able to work precise, this is a DIY job. The exact procedure can be found on various internet sites (To complex to summarize).
thank you raymond I knew you would chime in. I will have my injectors ultrasonically cleaned ( had that done on my E38 V8, nice difference), but you recommend to do the valve clearance first??
I understand that it's diffficult to state overhere, but where do I find most uf these vac hoses? Are they all around the airbox/filterhousing etc?
And is it possible that someone gives me a hand with these adjustments on the throttle, I've worked on a lot of cars but I'm very afraid to do something wrong on this car, last big job I did was removal of intake manifold on 730iV8 ( not easy!!). Would be very pleased if anyone would help me out, off course I will pay well. This is not a commercial forum I guess, but I hope that everybody understands my point since i've onl;y got the car for 4 months.
cheeers
Raymond thanks a million again,you can phone me too if you wish?
wout ( 0646333460)
Re: What about this synchronising injectors on 3.6?
Quote:
Originally Posted by Sebring NL
thank you raymond I knew you would chime in. I will have my injectors ultrasonically cleaned ( had that done on my E38 V8, nice difference), but you recommend to do the valve clearance first??
Yes.
Quote:
Originally Posted by Sebring NL
I understand that it's diffficult to state overhere, but where do I find most uf these vac hoses? Are they all around the airbox/filterhousing etc?
I still am working on an FAQ article about this subject, but the basic idea is to remove the intake plenum, after which you see them. Please read This article from Jason Weaver first. It should answer all your question.
Quote:
Originally Posted by Sebring NL
And is it possible that someone gives me a hand with these adjustments on the throttle,
I refer to the M88/3 specification which include the procedure. For the S38, you can skip two parts, but please read the article first as I am certain that you will ask more questions.
Furthermore, I replied to a similar question on the Dutch BDC forum, for which I refer to This URL
Last edited by raymondw; 26th November 2005 at 16:53.
Re: What about this synchronising injectors on 3.6?
ok ray thanks.
So as I see correctly on your dutch article ( you are alpinaB10 or something overthere right?) its all a matter of adjusting the pushrods?? and the screws that will move the throttle valves?
I believe that it is necessairy to use a airflow meter just like Wber carbs??
am I missing something or is this just the beginning?
btw wont be able to look at this forum untill monday, hence my home PC is in trouble ( better that than my E34 still haha)
thank a lot raymond and others, what a big help in only one week! fantastic knowledge gathering overhere, really what I was loking for! you guys know your things...
Re: What about this synchronising injectors on 3.6?
Quote:
Originally Posted by Sebring NL
I believe that it is necessairy to use a airflow meter just like Wber carbs?? am I missing something or is this just the beginning?
This part is NOT required for part I, the basic mechanical adjustment which needs to be performed before proceeding with Part II.
Part II, the synchronization is based on the underpressure values in the intake system OR the CO values of each cylinders (only S38). Please note that the peak value is not a reliable reference. To determine an accurate value, use averaging techniques to determine the mean value per cylinder.
The goal for the adjustment is the calculated average of the mean values per cylinder. Measure the underpressure of each cylinder sequentially. Thus NOT in parallel as is custom to multiple Weber carbs. Yes, I know an FAQ article is in order and actually am working on it, but I am to short on time to complete it.
Last edited by raymondw; 26th November 2005 at 17:47.
Re: What about this synchronising injectors on 3.6?
According to the manual, you can adjust the combustion by using these little "plastic topped things" . To get the right mixture you measure the exhaust fumes to make sure that you have the same CO value in all 6 cylinders.
The small tubes on the exhaust manifold that are pointing straight up are used for this. I will do that later on but it requires some test exquipment that BMW does not seem to have.
It all seems a bit tricky, so I will have to get someone to do it for me.
( better that than my E34 still haha)
. To get the right mixture you measure the exhaust fumes to make sure that you have the same CO value in all 6 cylinders.
Linear Mode
