Suddenly stoped working...PLZ HELP!!

[bzack]

My car has had MS-I contolling just the fuel for a while now. Suddenly one day I go out to start my car and it won't start. So I pluged in my laptop and while I'm cranking the MS-I apears to be shutting on and off and sometimes staying off entirely. As soon as I let go of the key and the starter motor stops all is well. This isn't a new setup, things were working perfectly. I didn't touch any wires,thats not to say something didn't come off by itsself. Ive spend days trying things and researching so this is kinda my last hope. I did notice from my hours of trial and error that if I have the injectors unpluged the MS-I acts fine while cranking (of course with no injectors hooked up it doesn't start). The only thing I can think of now is to reflash the MS or perhaps buy another one. I checked over my wires, checked grounds, etc. I'm really upset that this has disabled my car. My wiring setup is just like the one I saw in the manual. Also I bought my MS premade from DIYAutoTune about 8 months ago. Thanks for all the replies in advance.

[retal052]

I had a similar issue today. mine filled up the cyls with fuel. tried to crank and woulnt turn over because MSII opened the injectors permanently. I fixed it by reloading the firmware on the MSII. I took cover off. then put bootloader mode on "jumper on MSII chip". downloaded firmware from http://www.megamanual.com/ms2/code.htm and the software to load and flashed the chip. before cranking I had to take the plugs out and pruge all the fuel because the cyls were FULL of fuel. but all is good now.

[bzack]

I tried relfashing but it didn't help. I did figure out that if I pluged my injector positive cable to the battery instead of the relay it worked except the injectors go static when megasquirt is off. I took apart my cheap relay and it was all coroded. So I guess it was the relay, I'll buy another one soon and make sure. Strange, I thought if a relay was broken I'd loose complete power not get some. It worked until megasquirt tried to fire the injectors, then I guess too much power was trying to flow through the bad relay and it just overloaded and hence all the resets and such. Thanks.

[Matt Cramer]

Do you have a data log of an attempted start? If so, please post it, along with your MSQ file.

[bzack]

Attempted start? My car starts now that I took out the bad relay. Was doing some tuning and suddenly everything went lean, maybe my O2 has gone bad. My air temp sensor says 160F, seems high to me, not sure if that is causing the lean out.

[Matt Cramer]

Sorry, misread your last post.

Yes, a false hot reading will lean the MS out.

[bzack]

Air temp seems fine while im driving, I guess my pesky exhaust leaks heat up the engine bay while fidding in the driveway. Thanks to everyone who posted. Now back to the painful task of tuning.