Hi,
Well, I'm really starting to run out of patience with my MS install, and seriously considering scrapping it and going to carbs. What would I
need to get my car going again on carbs? Originally the car was an 2L injection Pinto, so I think I will need to change the dizzy, obviously I will
need a set of carbs and a manifold, is there anything I'm forgetting about. Also please don't suggest megajolt, I really don't want
to go down that route.
Cheers
Scott
[Edited on 10/9/09 by phoenix70]
whats the issue with megasquirt?
i'm sure someone can come round and help
please elaborate, you have said that you are pee'd off with MS but you haven't actually said what the problems are.
what setup are you running?
what ITB's?
What MS? 1 or 2?
I'm running MSnS 1 on V3 board, I have ITB's on it. I'm running a JAW wideband sensor.
My basic problem is I can't get the engine to idle correctly, it starts but the idle is very erratic. Looking at megatune, the guages are
jumping all over the place. I've put my timing light on it and the engine doesn't seem to be sparking right (again very erratic) but the WB
sensor is varying between, just about right to very weak.
Lots of problems, and I've been at this for almost a year.
Just to add, I built the MS myself, so I've no idea if it is working properly or not.
Just getting pee'd off with not having the car to play with.
Cheers
[Edited on 10/9/09 by phoenix70]
ok, not to worry, start from the beginning, what ITB's are your running, are they running std injectors and have you set up the basic constants
page correctly with the correct injector flow rate? what are the flow rates
second, what ignition set up are you using, r u running edis?
third, is the spark value on the Megatune screen the same as what you are getting on the timing gun?
is it erratically idling just during the warm up period and then settles when the engine is at running temperature?
are you running speed density or alpha-N?
What are you using for the crank sensor...36-1 wheel on the crank pulley?
Erratic operation can be caused by weak or varying crank sensor signal, or electrical interference.
quote:
Originally posted by omega0684
ok, not to worry, start from the beginning, what ITB's are your running, are they running std injectors and have you set up the basic constants page correctly with the correct injector flow rate? what are the flow rates
quote:
second, what ignition set up are you using, r u running edis?
quote:
third, is the spark value on the Megatune screen the same as what you are getting on the timing gun?
quote:
is it erratically idling just during the warm up period and then settles when the engine is at running temperature?
quote:
are you running speed density or alpha-N?
quote:
Originally posted by MikeRJ
What are you using for the crank sensor...36-1 wheel on the crank pulley?
Erratic operation can be caused by weak or varying crank sensor signal, or electrical interference.
quote:
Originally posted by phoenix70
quote:
Originally posted by MikeRJ
What are you using for the crank sensor...36-1 wheel on the crank pulley?
Erratic operation can be caused by weak or varying crank sensor signal, or electrical interference.
Yes, using a 36-1 wheel on the crank
what is your MAP reading at idle?
also have you balanced the throttle bodies?
[Edited on 10/9/09 by omega0684]
quote:
Originally posted by blakep82
[whats your crank sensor held on by? what is the bracket made of etc? could be that the sensor is vibrating away from the trigger wheel, missing teeth etc.
go on show us a log and the .msq, you know you want to.
You can't trust O2 gauges when you have uneven sparking. I know this from experience. The problem is that they measure O2 (yes, obvious I know)
which increases when you have a miss-fire.
So, lean gives high O2, lean miss-fire gives high O2, rich missfire gives high O2.
Surely we can sort this out.
Matt
quote:
Originally posted by matt_gsxr
go on show us a log and the .msq, you know you want to.
You can't trust O2 gauges when you have uneven sparking. I know this from experience. The problem is that they measure O2 (yes, obvious I know) which increases when you have a miss-fire.
So, lean gives high O2, lean miss-fire gives high O2, rich missfire gives high O2.
Surely we can sort this out.
Matt
I am a newbie at MS but I thought Alpha-N was the way to go with throttle bodies.
Are the TB's nicely balanced (I know this is difficult when you don't have a smooth idle).
Are the spark plugs all the same colour.
Does it rev up.
Now I'm interested!
Matt
I bought a carb balancer to balance the TB's, so they as well balanced as I can get considering the idle situation.
I'm sure the MAP is sitting about 50kpa at idle, but I will confirm this later.
i think that matt has got the right idea here, even 50kpa is quite high at idle,i always thought you should see around 30kpa at idle, when i did my
conversion i was getting MAP values between 60-70kpa so i went to alpha-N and after a few initial niggles got it set up pretty sweet.
maybe its the way to go for you too? i found that i had to run the engine at a slightly higher idle of about 850-900rpm, rather than 750-800rpm on the
carbs.
Are you using proper shielded cable for the crank sensor ?
Also - 3mm sounds a bit weedy for the sensor bracket , I make mine from at least 12mm ally !
I would also dump speed density - it just wont work with throttle bodies . I have mine on alphaN and can have the tickover as low as 500 rpm 
I would also check the accell enrichment settings - if they are too low , it can cut in intermittently causing erratic mixture readings .
Most common problemfor erratic sparking is interference on the vr sensor signal.
Is your cable to the sensor sheilded?
Is the sensor wired the right way around? (if not it will cause exactly those issues you describe)
Is the vr sensor cable routed away from all other high voltage cables? Including the coil trigger cables and the injector triggers?
Do you have the wheel decoder settings corect? They should be as shown here:
Set the vr sensor to 9 teeth after the missing tooth at tdc.
David
Well I've had another go at it, after reading all the reply I've had. I've looked at the VR sensor, and the bracket is rock solid, so
no movement there, check the wiring, and swapped the cables round, still not difference (the cable is shielded). The wheel decoder setting are
correct from my understanding.
I've taken the advice given and switched to Alpha-N rather than speed density.
I'm sure my real problem is down to spark, I pulled a couple of plugs out (3 & 4) and they are absolutely black with soot, so obviously
running way too rich. I put my timing light on to each cylinder and found the 1 is interminted but reasonably regular, 2 is better that 1 but still
seems to miss a few sparks, 3 and 4 are showing almost no spark at all, just the occasional flash.
Don't know if this help at all, but I really need some help. Is it possible my coil pack is on its way out?
Cheers again
Scott
Dodgy coil pack or leads then?
If you are getting intermittent sparks then you need to fix that first
Do you have the dwell set right? If the coil drivers arent getting hot you could try increasing the dwell a bit. Does it fire the cyls when you nail
it? That would show the spark is powerful enough. If you want to check the timing you can set the fixed angle to say 15 degrees and then check. It
should be rock solid.
Hope this helps!
Still running out of patience.
I've fitted another coil pack, this made no difference. I've adjusted the VR sensor to ensure it's not too far away, still no
difference. I've swapped the HT leads around (they are brand new), still no difference
Did you post any log files? Have you checked for any reset events?
Post both your MSQ and logs and we can probably help more 
Ok, I'll post up the msq file, I think I know how to create a log file, but is there any particular point I should start and stop logging?
Cheers.
Scott
Here is my current msq and a data log file I've made, no idea what this means, but hopefully someone can make some sense out of it.
Cheers.
and data log
OK, for a start it looks like you havent set your TPS bins up properly.
Looks like you are running Alpha N but have Speed-Density type entries in your VE table.
I would expect to see values of around 55 for closed throttle and 225 for WOT if you are running GSXR throttle bodies.
Connect the laptop up, turn on the ignition.
With your foot off the accelerator go to Tools>Calibrate TPS
Hit the get current button next to the closed throttle box and note the number.
Then foot to the floor and repeat for the WOT box.
Use these figures for the top and bottom rows of the VE table.
Fill in the rows in between with a range in between. Make some close together around 1/3rd throttle as this will be your cruising range.
Cheers,
David
PS I will reattach an MSQ in a min which should get you somewhere close.
PPS You are also running massively rich too.
What throttle bodies are you using?
Give me 10 mins to compile another MSQ....
[Edited on 16/9/09 by flak monkey]
[Edited on 16/9/09 by flak monkey]
Have a look at this one.
Also not sure if you need the PWM idle stuff. If not, turn it off.
Cheers,
David
David,
I've used your config file (thank you). Checked the TPS configuration and found the ADC ranges from 9 to 192, so I've adjusted the bins
accordingly (see attached).
I've also switched off PWN (I think) as I don't need it.
Still think it's not sparking right, also the AFR still show it's running way too rich.
BTW the throttle bodies are off a GPZ1100 if thats any help.
Thanks for your help.
Scott
It may be running so rich its putting the sparks out (for want of a better way of putting it). Lower your req fuel to about 10 and see what
happens.
I cant see anything obviously wrong with the MSQ file (though I may have missed something)
David
David,
Just wanted to confirm something. If I put the required fuel down to 10, the values in the VE table go up. I thought the VE tables values should go
down?
Cheers
Scott
Nope, they will go up.
You need to leave the VE table alone and just put the req fuel down. Do not scale the VE table.
This will have the effect of weakening the mixture across the entire rev range.
10 may be too lean anyway (halves your current req fuel). I would expect it will end up somewhere around 15.
Cheers,
David
Well here is the update for today.
I've messed around with the req fuel setting, and it did seem to improve as I lowered it (got to about 12 and it seemed happiest)
BUT still not running on all cylinders, still not seeing a consistant spark on cylinders 3 and 4.
Was think, could it be something wrong with the VB921 drivers, so I've pulled the MS out and connected it up to the stim again.
I checked the voltages on the input and output of both VB921's. The inputs are roughly the same at just under 1v, but the outputs are massively
different, one is showing 3v, the other next to nothing. Could be something to do with the stim.
Cheers
Scott
[Edited on 17/9/09 by phoenix70]
Could be a faulty coil driver.
I fited the BIP373's to mine.
If your two dodgy cylinders are on the driver that doesnt check out OK I would replace them both with the BIP's.
They are more resilient than the VB921's anyway
http://shop.diyefi.co.uk/index.php/spark/drivers-igbt/bosch-bip373-spark-coil-driver.html
On the other hand I think I have the working VB921's I pulled out of mine if you just want something to try?
Cheers,
David