4G63 CAS issue? (SOLVED)

[PUMPISH]

I am running MS3X COP with a intern ignitors 4g63 CAS

First I had reving problems and it was fixed by adjusting ms3x pot.

The engine runs very well and I can rev 8K but as soon engine get warm it starts running very lean and get weaker spark and noteven responding tuning and reqfuel value change.

I stil get clean signal at composite logger and no sync loss.

Now I have Green Lid, Optical Type CAS.
Also, I've heard that black Lid CAS hall effect sensor is higher resolution and has better singal.

Any ides?

[Matt Cramer]

Make sure the spark outputs are not giving you 5V with the key on and engine off.

If that checks OK, decrease the dwell if the coils are getting hot.

[PUMPISH]

Make sure the spark outputs are not giving you 5V with the key on and engine off.

If that checks OK, decrease the dwell if the coils are getting hot.

Checked spark outputs and they are 0 V och coils not even warm when ignition is ON.

We changed CAS to black top (hall) and now the engine runs well even hot but as soon boost comes the engine leaning out and missfire.

New coils, spark plugs and injectors, fuel pressure is stable too.
The problem is that the client lives 400km from me, he will try to logg today and then I can post it here

Thanks

[ae86drftr]

Similar issues here as well. Same CAS same MS3X and same issues. Still havent resolved the problem however a Friend of mine has been helping me and so far we have found that there is a leaning out around the area that it begins "misfiring" so Ill be subscribing to this topic and posting back as soon as I find my problem. However that may be a while because I just ordered another MS3X for my other TOY(ota Corolla).

[Gokart]

can you post your tuning file so that we can have a look at it?

[PUMPISH]

Update!

We changed CAS to black top Hall.
Now the engine runs well at low load and no changes when the engine get hot. The engine can rev up to 8000rpm without problem!
But as soon boost comes even at low 110kpa the lambda leaning out!
We changed the whole fuel system, fuelpumps, FPR, new 2200cc injectors and the pressure is OK , new coils, new sparkplugs but it leaning out even if we increase reqfuel and VE table.

The strange thing that from the begining when we first time started the this engine we had sync loss issue and could not rev more then 6500 rpm but the engine was running very well up to 360kpa boost and up to 6500 rpm.

Then we tuned pots and now we can rev without any sync loss up to 8000rpm but as soon boost comes the engine leaning out.

The biggest problem is that this client lives 400km from me so I can only give him support by phone.
Allready been there 3 times without any progress.

Here is the latest log he did today and msq, he increased reqfuel a lot and it stil leaing out and missfire but no sync loss at all!

[PUMPISH]

I am wondering maybe we should change VR input to HALL imput in the MS3X?

[ae86drftr]

Is the expansion board set to VR currently? When the MS3X was assembled was it assembled according to page 81 of the Megamanual?

[ae86drftr]

I just read a little bit about it myself and believe this may just be my problem however I am not near my MS3 at the moment to confirm.

[PUMPISH]

Is the expansion board set to VR currently? When the MS3X was assembled was it assembled according to page 81 of the Megamanual?

no its hall both 3x and v3.0 but I mean that I wanna try to remove vr circuit and 52 and 56 pots and just make streight hall circuit

[ae86drftr]

Ok. Now I understand you. Let me know if you do this because if it comes down to this I just may go that route as well.

[ae86drftr]

One last thing, in the manual it specifies to adjust the cam pot to 3 turns however theres this specification with and without the jumper. Im curious to know if you have the jumper in place or not.

[PUMPISH]

One last thing, in the manual it specifies to adjust the cam pot to 3 turns however theres this specification with and without the jumper. Im curious to know if you have the jumper in place or not.

we run with a jumper.

I dont realy understand what the differencer between
5.2.14.2 Cam sensor input - open-collector hall sensor / optical sensor
and 5.2.14.3 Cam sensor input - hall or logic sensor.

Ok if you run green top optical then t is 5.2.14.2 in use but why the hall is both with a jumper and without?

[ae86drftr]

Thats exactly what I was wondering. I am going to email the guys over at DIY to see what they say.

[PUMPISH]

Thats exactly what I was wondering. I am going to email the guys over at DIY to see what they say.

the strange thing is that first 2 days it worked at high load up to 370kpa boost with both ptical green top and black top hall and both had syns loss at 6400 rpm and could not rev higher then that.

Then by triming pots r52 and r56 we can rev 8000rpm to the revlimit at idle but fuel leans out at the load 105kpa up with BOTH green and black top cas.

Before we intalled MS3x it was old Microtech and it worked perfect. So it feels like something MS3X does not like with CAS

[ae86drftr]

It is almost scary how similar our scenarios are. Prior to installing the Megasquirt my engine was running fine on the factory ECU. Revved fine, entered boost and was fueled fine however, since installing the Megasquirt I have had consistent revving problems. At first the issue was the pots, adjusted them and them I had no load revving. but once there is a load the engine will not be fueled up top. Quite the conundrum.

[PUMPISH]

It is almost scary how similar our scenarios are. Prior to installing the Megasquirt my engine was running fine on the factory ECU. Revved fine, entered boost and was fueled fine however, since installing the Megasquirt I have had consistent revving problems. At first the issue was the pots, adjusted them and them I had no load revving. but once there is a load the engine will not be fueled up top. Quite the conundrum.

Tomorow we will try without jp7 jumper.

Did you check that you had 2.5V at testpoint and tryed with and without jumper?

Next step to remove VR circuit and make it hall.

Just wanna this car to run again before the summer is over
https://www.youtube.com/watch?v=RASGL9qvzvs

[ae86drftr]

I hear you. I want to get a full power band out of this hunk of junk.

https://youtu.be/gFbrvB0SOFE

[ae86drftr]

I just got home and checked my Megasquirt and on the expansion card I have the cam jumper in place

[PUMPISH]

I just got home and checked my Megasquirt and on the expansion card I have the cam jumper in place

tryed without jumper and the car dont start at all without jumper