"EDIT" STRANGE SPARK!!

[kong karl]

Hi all.

I have just installed my MS3X on my first V8.
It is a 98 LS1 stock engine. I have wired up the harness and all sensors except the IAT and O2 sensors.
Reason for this is that i am waiting for the sensor to arrive.
Can the engine Start without these sensors??

Now my problem:
I have logged the cranking and i see good signals from the crank and cam sensors. But i see only 154 to 167 rpm on crank.
I can set the MS3 cranking rpm lower than 200.
I noticed when i wiewed the log file there where timing error. it was jumping from -13 to 100 or so.
What is causing this problem? and is this the reason that i dont see more than 160 rpm`s at crank?
Or are my sensors bad?

The pots are set as the manual say they should .

[grom_e30]

the rpm signal is solid in the logs, i did notice you map never goes above 65kpa, what does it read with the ignition on but engine not running / cranking?? may need to set the calibration for that. the cranking rpm setting is best to set 150-200rpm over the speed your engine cranks at. its more of an over xxx rpm the engine is not in cranking but is actually running setting.

[kong karl]

The map says the same 65KPA all the time. first is showed invalid. then i reloaded the gauge and calibrated the sensor. but still show the same.
i thought it might have something to do with me (now) living in a town 370 meters above sea level.

Ok so the crank rpm is just so the ecm knows the difference between cranking and running. It have nothing to do with the engine don`t fires up.
I will sett the crank rpm up 200 rpm`s

[kong karl]

I just read this in the manual:
It may be refusing to start because the fuel isn’t quite right. If the engine does not go above start-up
cranking RPM, try adjusting the cranking pulse width.

The MS will allow me to adust it under 200 rpm`s. i only get 167 tops.

[grom_e30]

baro at sea level is about 101kpa so at 370m id estimate 95-97 kpa i may be wrong on that but map sensor looks off to me.

try adjusting the cranking pulse width.

not the 'cranking rpm' different settings

[kong karl]

i will check the map sensor tomorrow. see if anything have happen to it. I will also check the crank pulse with and see what happens.

I think you are right about the map sensor. the MS register that there is little air (thin air) so there will be less fuel then it needs to fire.

Luckily i have a spare MS2 laying around for parts.

[grom_e30]

do remember you are using speed density so that uses map & iat and both of these are missing or giving incorrect information to the ecu it will have a hard job working out how much fuel to add.

[kong karl]

i was going thru my tune file in tunerstudio. and i checked the map calibration..... it was set to the wrong map sensor.
Was MPX4250. shall and is now MPXH6400.
I will see if i have the old IAT sensor if not i will wait for the new one.

I just wanted to see if the engine would start. running it and tuning it will wait.

Well Good night all. 2 am here now

[montelibre]

My Jeep has a slower speed cranking than yours...
http://www.msextra.com/forums/viewtopic ... 31&t=55449

[kong karl]

I have now calibrated the map sensor correctly. now reads 96.6KPA.
I have done a new injector output test and all are working. i have also done a new coil output test with new spark plugs. all Ok.
Firing order 1-8-7-2-6-5-4-3.
Mounted the new plugs, and tested. But no difference. No indication that the engine will fire at all. it is getting fuel.
I am frustrated over this. all logic says it should fire up.

I have changed from full sequential to semi sequential. no difference. also changed injection, no difference.
No sign of combustion

Here is my last log file

Any ideas??

[grom_e30]

are your coils and injectors wired up a=1,b=8, c=7,d=2 and so on.

[kong karl]

yes they are.

[grom_e30]

can you pull a plug check if its flooded or dry.

edit: could try lowering the cranking advance as well, and also cracking open the throttle a bit.

[kong karl]

i will pull a plug and check. i will also double check the injector and coil wiring.

[grom_e30]

id check you have power to coils/injectors in crank and run key position while you are at it.

[kong karl]

Now i have checked the coils and injectors once again with a friend.
All the coils are wired as the should, so are the injectors.

When i crank the engine the coils fire. But here is the wierd stuff

Some of the coils dont fire all the time, like they are skipping some spark cycles.
and some of the coils is firing pretty close to wasted spark.
1 and 3 cyl is almost wasted spark. The same for 2 and 4 cyl.
5 and 7 cyl skips some sparks cycleses and so is the 6-8 cyl.

Still get the TIMING ERROR issue when the spark plugs are removed. Get sync issues also. and i noticed today that i get PROTOCOL ERROR when cranking.

But as soon i put in the spark plugs all the errors and sync loss go away.

I have had some problems with loosing the connection to MS3. going offline. I use a USB cable between pc and MS3. Never had this problem before.

Any ideas what could cause this issue

[grom_e30]

maybe you are getting noise in the usb cable?

[kong karl]

do you think that could cause all this problems???

[grom_e30]

it may well explain the going offline and the protocol error, i had a look through ur logs and in all of them when the engine is cranking it reports as being fully synced up so i dont think its the crank or cam signals. as to the weird coil firing im not sure on that one.

[kong karl]

it may well explain the going offline and the protocol error, i had a look through ur logs and in all of them when the engine is cranking it reports as being fully synced up so i dont think its the crank or cam signals. as to the weird coil firing im not sure on that one.

I will see if i can get help tonight or tomorrow from a friend. Then i will swap out the cable and try all over again.