Help on TPI tuning

[fscott]

I have calibrated the tps and all is normal.

As already mentioned, I have calibrated it. I doubt its a simple thing as not very many people have had this happen. thanks

All is not normal. I looked at your log and your TPS is at 100%, so you are stuck in flood clear mode.

As to why, we can't tell you that. Like lance says, use the stim to verify that the MS is not to blame.

If the MS checks out, something is wrong with either your wiring or the TPS. Make sure that the TPS is an actual potentiometer and not a simple switch. Make sure it's not wired backwards.

[superfiero]

Hey guys, sorry for being so impatient. My dad was really riding my butt to get this thing done, and thats when I posted that. I am unsure of what changed today but all of a sudden I tried it with the db9 disconnected and bam, it fired. I have a vaccum leak right now but if I held the gas a little, it would go ahead and rev. Its running real bad but for some reason, my computer seems to hate megasquirt. I am going to be getting a laptop soon so lets hope it gets along better. at least my dad will quit riding but butt about it for a while. Again sry for being impatient, can you forgive me? anyways, I need to go over things, tighten up everything again, fix a few leaks, and probably get the injectors cleaned. Then I hope to have a smooth running engine once again, after many hours of tuning of course. thanks, Andrew C

[Bernard Fife]

superfiero,

I'm sorry, but I accidentally deleted the files you sent (oops!). Could you resend them, or post them here, and let me know what code you are using? I'll try running them on the bench here to see what's up.

Lance.

[superfiero]

Im using mt 2.5, i think

[Bernard Fife]

superfiero,

I'm just not having a good day here... I forgot to remove the 12V signal on the board for the MS-II stepper driver, and fried my MS-I chip. I think this was my last 68HC908 proocessor, but I'll dig through my parts and see if I have another one.

Lance.

[superfiero]

that sucks, all the little things you have to remember huh

[Bernard Fife]

Superfiero,

Yeah, these little details bite me all the time. I've done so much on MS-II over the last year that I rarely load MS-I anymore.

I had another 68HC908 laying around and have it loaded and working now.

I have loaded your MSQ file from the thread (to standard v3.000 code).

There are a few oddities:

- there's no reason to use 4 squirts with port injection, this just lowers the req_fuel and makes idle control more difficult. So go with 2 squirts/alternating.

- the cranking pulsewidths were both 0. Set these to 22 and 4.5 to experiment with.

- the afterstart enrichment was 0% for 0 cycles. Set this to 35% and 250 cycles to start.

- thye EGO is set to narrow band, but with a switch point of 0 Volts. Set the switch point to 0.450V. You also need to fill in the other fields (I have doine this in the file below).

- the warm-up enrichments were all 100%. I have adjusted these to reasonable values.

- the VE table was all blank, including the kpa and rpm bins. I have filled these with the values from Bruce's 350 TPI Jaguar.

With these settings, I am seeing reasonable behavior from the stim, including the TPS (with MT225 and MS_I as the code_variant). I have attached the setting file (below). Don't use it for MSnS-E, though. If you are using MSnS-E code, let us know which version.

If you are running the standard MS-I code, give this a try, and do a datalog (even if it won't start),

Lance.

[superfiero]

I dont know why but all that stuff was in there. I will load that soon and see what it does. thanks a million

[superfiero]

It started and idled. I need to run all the vaccum lines now but it still runs without it. Thanks Lance for the settings, runs great. now I just need to get my laptop working with it. it has com1 but for some reason it doesnt pick anything up, my computer will but not the laptop. Its an old P1 intel, compaq series 5150. I loaded megatune to it through a floppy and hooked up ms with the only com port, nothing happens. Anybody have an old laptop like this, maybe its just me but I thought it was pretty simple. thanks for everything.

[Bernard Fife]

superfiero,

I tune with a P1 120MHz, so I can sympathize!

It's not unusual for the serial ports to be fried on these old laptops. Have you tried the loopback test on the laptop with pins 2 & 3 jumpered? That would be a start.

And make sure no other serial comm programs are running (internal modems were especially bad for this, particularly if they are set up to recieve an incoming call).

Also, go into the Control Panel, and look under system/hardware/device manager (or similar) and check that the port is reporting as "working properly"

Let is know what you find.

Lance.