My engine stalls after a start. I managed to start and do a few revolutions(2s) by playing with the variables in the VE-table and reqfuel, but then stalls no matter what I change in the afterstart settings.
I have a datalog and config file here: http://www.box.net/shared/upcms1pxcs
and here http://www.box.net/shared/6brf0yloow
Any solutions?
Thanks
Tim
Hi mate,
I see only an MSQ and a config there, what firmware are you running?
I'm running firmware 1.053 as its been a while I used the board again.
The VE table looks very lean - far too low at 10%
What is the needle on the Injector PW doing between the point of starting, and stalling?
not sure what the pw does before it stalls, but its very strange that when I download the config with the batfiles the tables are empty, there is nothing written in the tables notepad????
Are both files empty? Are you letting the download window close itself?
EDIT/ OK now it downloads the tables as well
When I start the engine it runs for a 2 or 3 seconds on the cranking and afterstart settings but then dies.
here is the datalog: http://www.box.net/shared/6vhdasugwc
I see in that log some huge spikes in rpm signal, sudden jumps to near 20000 rpm or over that.
Yeah I think I have a problem with the hallsensor setup. The vibrations of the engine are such that if the sensor is at<1mm of the trigger, it will touch the trigger and damage the sensor. If I put it at 1.1mm I have some trigger errors :(.
I am not sure this is the reason why the engine stalls at the same point everytime.
What trigger are you using?
Theres no way on earth that you're going to get the engine to run reliably.
Have you got your IACV connected up? Take a look in the data log at IacDC and see what happens with it at the point where the car stops running.
First off all a little summary of my setup:
BMW 518i 4cyl m10b18 8valves
Ljet distributor
stock engine
stock 200cc injectors
vems controls 1 coil and 4 injectors individual, 1 fuelpump, lcd, firmware vemsMT1.0.53, 1widebandO2, IAT, MAP,...
The car has run perfectly with this setup previously, due to technical inspection I have removed the turbo and vems momentary.
In the meantime I have soldered the 30v Transient suppresion diode, made another wireharness, and soldered the AREF.
After this I tried to install the vems (first without turbo ) again but encounterd a few problems mainly due to the new harness.
I use a Hallsensor as primary trigger on a crankwheel with two teeth 180Ã,° apart. The sensor gave me some issues regarding not touching the trigger and not having triggererrors on the other side. But after a little manipulation it did its job perfectly!
As far as idle control I have only a mechanical electrical heated auxilary airvalve which is functioning as it should.
Now the engine dies after the afterstart. I played with the ve parameters but nothing changes???
If you've had to reduce the fuel to the levels I've seen on the tables you sent in the MSQ then there is a problem somewhere.
Adding the transient suppression diode means that the injectors close quicker, this means you need more fuel.
Ok I understand that, but when I initialy wanted to start the engine it smelled of excessive fuel and when cut back the cranking parameters it started but then died quickly.
I will try again tomorrow with more fuel in the ve table
Work on getting a clean cranking signal before you do much else.
Hi
I have a clean cranksignal now but no start?
Here is the cranking graph http://www.box.net/shared/1v1i73668k
Are you still getting spark? If so pour a little fuel down your throttle body and crank the engine, you should be able to get the engine to fire and run briefly.
What was the problem with the crank signal?
The trick with the TB is kind of difficult because my TB is pointing downwards
the cranksignal was poor because the trigger(2 bolts 180Ã,° apart on the crankpulley) were either too far from the sensor either too close(touching). Now its not perfect yet but I have atleast a clean cranksignal.
Have to see if I have spark and if my injectors are firing the way it should. Can I just hook 4 small 12v 5W lights on the injectorconnectors and see if they blink?
I will test the spark with a timinglight.
I can try this tommorow.
I think its clear from the PW graph that the injector pulse width drops to zero once the afterstart enrichment has finished.
and what can be the reason? is it something software or hardware?
this is my latest msq file http://www.box.net/shared/2141ipoo4g
and datalog http://www.box.net/shared/4uro5obk0c
That datalog shows spikes of 25500rpm.
Your VE table is as low as 10 down in the bottom left hand corner - that should all be around 50 shouldnt it?
Also your lambda table looks completely wrong, theres no way that you want to achive a target lambda of 1.11 at the lower end.
The fuel PW is calculated then divided by the lambda setting - so as a rule of thumb (ignore air temp compensation for this):
(7.2ms @ 55%ve)/1.11 = 3.96/1.11 = 3.56ms
Just for a bit of an experiment, in Settings->Priming Cranking Afterstart set the cranking threshold to 3000 rpm, this will keep the ECU in the cranking phase and the engine should achive a fairly acceptable idle on this alone.
Once this is achived bring down the cranking threshold and you should see the point where the changes from cranking to the after start enrichment phase, if you're in the fuel tuning screen you'll see where the fueling is going wrong on the table by watching the location and the PW guage drop.
I see problem due to added TVS diode.
You may need much much longer PW for injectors as previous.
In datalog picture lowest value is not 0, Rob. There is 2.9ms. Witch can be about 3x less than needed.
Quote from: GintsK on February 16, 2008, 12:44:50 PM
I see problem due to added TVS diode.
You may need much much longer PW for injectors as previous.
Good point, it should be possible to increase the PW by just increasing the required fuel value.
Quote from: GintsK on February 16, 2008, 12:44:50 PMIn datalog picture lowest value is not 0, Rob. There is 2.9ms. Witch can be about 3x less than needed.
Its difficult to read without the cursor - eitherway theres not enough fuel - TBH I was looking for some kind of fuel cut.
OK thanks will try that
but I still have problems with my trigger
I have a triggerwheel with 2 teeth 180Ã,° apart.
Its two 8mm bolts (the thread of it).
If I put them too close to the sensor it hits and misfires,if I put it a very very very bit furhter away it doesn't read (triggererrors) the trigger anymore >:(
I tried to put the bolts on the thread in order to have a bigger triggersurface but then there is absolutely no trigger anymore?????
Can someone check my trigger parameters please?
Primary trigger =3
Edge= Rising
Type=coiltype
the rest is disabled
TDC after trigger=61
Number of teeth on wheel=2
Crank min period=1200
Angular width of tooth=0
Tooth relation normal=118
Tooth relation missing=181
Angular width of missing tooth=0
Engine phase when to reset=255
Thanks
Which pin are you powering your Hall sensor from?
Are your p259 channels still working?
I'm wondering about the possability of your 5v feed not being up to spec and the net result being your Hall sensor's lack of sensitivity
I have pin28 as a +5v for the Hallsensor and pin29 as a +5v for the TPS.
The TPS is working as it should but I will check the +5v of the Hallsensor.
PROBLEM SOLVED!
I had a few issues to solve:
1. the hall sensor doesn't like a stainless steel bolt on the trigger
2. With 30v TS diode no PWM is allowed so 100% is needed
3. I had a coil wiring issue with the 12v supply due to disconnected stock wiring of the coil
so for now nice idle without trigger-errors
Thanks guys for the quick help! Its nice to have some knowledgeable people around.
;)Tim
No problem ;D
Now lets see your installation up in the projects section, with some pictures!
Rob