Need help with megasquirt'n'spark

[FormerMember]

Hi,
i've been trying to get my engine to start for over a week now, but no! The damn thing won't start I'm running out of ideas and time so i thought i'd post up here to get some help

So the problem is that engine won't fire up. Starter works and spark comes + fuel pump works but it won't start! Datalog also shows that injectors open when starting.

Here http://users.tkk.fi/~jhaukile/bmw_e30_m30.zip are .msq and datalog, i'd really appreciate it if someone would look at them and tell me what's wrong. My e-mail is jhaukile ( at ) cc.hut.fi if you want to email me corrected files.

Specifications:
-engine '87 M30b34, 3430cc, 218hp@5200, 229lb/ft@4000.
-Hall (honeywell 1GT101DC) at crankshaft pulley, 45deg BTDC trigger and next 120deg forward (3 triggers)
-Injectors original 16ohm, 188cc/min.
-Megasquirt'n'spark, extra 021u3, megatune 2.25b417

Thank you very much!

[FormerMember]

Now i've clear RPM signal and good spark (one wire was in wrong place ) but engine still not firing up

I think the injectors aren't firing (can't smell fuel and lambda shows really low voltages), i've all injectors connected to bank1 (2 wires from megasquirt) and bank 2 is empty, how i tell this in megatune? I've extra 024s9 and megatune 225b417.

One weird thing is that when power on the fan/output4 light flashes in megatune and led is lit dimly in the box (when powered up the led is bright but dims slowly). Any ideas what's going on with that?

Oh, and if not too much trouble i'd really like to check out some NA M20 / M30 megasquirt'n'spark settings.. if you have one please email me, thank you!

[Ant]

hey dude, just started to MsnS my turbo project, getting there slowly.

I am no expert on this but I'll try and help M8

You say you feel there is no fuel, the pump is runing yes ?
you should really have the MS injector grounds wired in two banks, 1,3 and 5 on INJ 1 the reminder on INJ2

you can run the risk of killing the FET drivers apparently


are you using a relay board ?

Do you have power to the injectors?
100% sure your TPS is correctly set, have you set your TPS stops(ADC) in the constants section ?

was the car originally Jetronic or Motronic dude ?

as always hit the MSEFI forum and do a search, saved me a lot of pulled hair

[FormerMember]

You say you feel there is no fuel, the pump is runing yes ?
you should really have the MS injector grounds wired in two banks, 1,3 and 5 on INJ 1 the reminder on INJ2

you can run the risk of killing the FET drivers apparently

Yeah, pump runs and when i disconnect the fuel hose at the engine there's fuel coming. So i'll put injectors on two banks, ok.

FET drivers? where are those and how can i ensure they are ok?

are you using a relay board ?

Do you have power to the injectors?
100% sure your TPS is correctly set, have you set your TPS stops(ADC) in the constants section ?

was the car originally Jetronic or Motronic dude ?

as always hit the MSEFI forum and do a search, saved me a lot of pulled hair

No relay board, power to injectors ok (12v on both pins when power on). TPS is correctly set (realtime display shows it's ok).
Orig. Motronic 1.0.

Now i think that my triggers on camshaft pulley aren't good enough (when rotating a piece of metal with drilling machine shows like 21 or 136RPM but when cranking it shows exactly 100 or 200RPM, gotta check the datalog out though).

I've same kind of thread up there at MSEFI, just thought to post this up here too because there ain't so many BMW guys i think.

Anyways, thanks for the help. New ideas are always foor good

[Ant]

you are using the camshaft for triggering ??

there are codes for MSnS that allow you to run the stock motronic 60 -2 crankshaft pulley dude.

camshaft is no good, the sensor resoloution is too low dude

with regard to the injectors, you say you've power to both pins.... are we taking on the MS output side or @ the mini plugs @ the fuel rail ends, obv power to one side , earth triggered via the MSnS

maybe have misunderstood ?

[FormerMember]

you are using the camshaft for triggering ??

there are codes for MSnS that allow you to run the stock motronic 60 -2 crankshaft pulley dude.

camshaft is no good, the sensor resoloution is too low dude

I've to weld the triggers to another place on camshaft pulley, i know few people who have triggers on camshaft pulley and they've no problems with that. Just original 6mm bolts welded there so i think it should work when done correctly (apparently i haven't done it right.. well, you learn by doing ).
I've original sensors in "clutch-box" (don't know the right word for that, anyways between transmission and engine) but i have no idea that what kind of signal comes from there. Should find out, though.

with regard to the injectors, you say you've power to both pins.... are we taking on the MS output side or @ the mini plugs @ the fuel rail ends, obv power to one side , earth triggered via the MSnS

maybe have misunderstood ?

I pull the plug off the injector and turn power up. Then both pins are +12V (other goes via relay straight to battery and other goes straight to MS box, and when MS wants to squirt it grounds). This should be ok.

And now to read more about triggering -->

[Ant]

Ahhh, you have the older type with speed and referance sensors on the flywheel

Rotational speed is measure via counting teeth on the ring gear, TDC is with a bolt on the flywheel face

Ditch those dude, source the later motronic type with just one ref sensor on the front pulley , that is know to work fine with the MSnS, just need the correct extra.ini files I think, try www.e30tech.com if you have not already, there are a lot of experienced BMW squirters on there M8



what pinouts are you using from the DB37 connector dude ???

I have 12V to injectors running in parallel with MSnS main power feed pin 28
pins 23/33 on DB37 are Inj 1,3,5 grounds ( via MS)
pins 34/35 on DB37 are inj 2,4,6 gorunds, via MS again

thus when powered but not cranking the inj are 12V but not grounded so no fuel, once cranking @ set rpms the MS ECU grounds the injectors in two banks to supply the required fuel

HTH

[FormerMember]

Ditch those dude, source the later motronic type with just one ref sensor on the front pulley , that is know to work fine with the MSnS, just need the correct extra.ini files I think, try www.e30tech.com if you have not already, there are a lot of experienced BMW squirters on there M8

Gotta read more about this but why the 60-2 doesn't work? Wrong kind of signal coming?

what pinouts are you using from the DB37 connector dude ???

I have 12V to injectors running in parallel with MSnS main power feed pin 28
pins 23/33 on DB37 are Inj 1,3,5 grounds ( via MS)
pins 34/35 on DB37 are inj 2,4,6 gorunds, via MS again

thus when powered but not cranking the inj are 12V but not grounded so no fuel, once cranking @ set rpms the MS ECU grounds the injectors in two banks to supply the required fuel

HTH

I'm using same as you, +12V to injectors comes through original relay though.
I'm getting ~10V with multimeter on both pins when cranking, should be ok.

Anyways, i think i found the fault. Spark is really weak when starting the engine (with drilling machine spark was strong so ignition system is ok), so signal from hall is bad (probably the pieces of bolts on pulley ain't good enough) so i'll have to make better ones.

There's new datalog and .msq if someone is interested and wants to take a look: www.hut.fi/~jhaukile/datalogs.zip

The weirdest thing is that when powered up fuel pump runs for about a sec, RPM shows 1 and PW is 4.9. Then when still power on after attempting to start the car RPM remains at the last RPM, fuel pump runs and PW remains at 4.9. Also the "cranking" box is lit on megatune. This lasts for few secs and then stops. What could be causing this?

[e30_Turbo]

Another Megasquirt user!!

Excellent, just wish I could help with the questions......I've had no comms at all since it arrived, so having my own issues, although Ant is pretty sure he knows why mine is a mute.

Fingers crossed tho, we have the answers now!!

Good luck with getting yours on and running, be good to see what results it gives on a N/A M30

Mark.