falcon

iTrader: (13)

Ok, so a few days ago I went about properly securing my megasquirt since it's just been taped to my stock ECU for a while. So I did that, and at the same time I cleaned a bit of surface rust on the floor in the car with POR15 so I had to let the paint dry for a day.

I went to start the car yesterday, and it fired up on like 2... maybe 3 cyl. It was hard to tell but it was definatley not running on 4 and ran like ****. The car would only stay alive with almost full throttle. I let the throttle off and it died.

Now to the frustrating part. I try to start it again thinking maybe the plugs were a bit wet and it needed to be cleared out. It turns over a few times... sounding pretty harsh and turning over slow. Then all of a sudden nothing. NADA. The starter is still trying to turn the car over but all I get is a "CLUNK" once... and the engine is not turning. I can hear the starter though so I don't know what's up.

I didn't make any changes to the Megasquirt, jsut unplugged it and plugged it back in. I'm super frustrated right now. I had to take ******* public transit to work. I DON'T take public transit. FML.

So what do you homos suggest is wrong?

Braineack

iTrader: (62)

did you swap the coils around somehow?

falcon

iTrader: (13)

Nope. Running COPS... and I didn't move anything. Just unplugged the ECU... secured it to the foot panel that goes between the carpet and the stock ECU area and plugged it back in.

Braineack

iTrader: (62)

i misread. so the motor isnt spinning?

Cococarbine3

iTrader: (1)

This same exact thing word for word happened to me a couple months ago, except I got a ride to work. I finally gave up diagnosing and put the stock ECU back in. My assumption was that I had a faulty microcontroller. When I get the MS2 chip I will find out for sure.

falcon

iTrader: (13)

Correct. The motor WAS turning over... it ran for about 10 seconds. Then I let it die. Now it doest even turn over but the starter is trying to do it's job. When the starter ingages all I get is a CLUNK.

falcon

iTrader: (13)

Word for word as in your engine "CLUNK"'d too? Did the engine end up being OK? I'm just worried that somthing similar happened to me that happened to Wayne_Curr not long ago. He ended up hydrolocking his motor from a faulty MS.

And this is not instilling confidence in Megasquirt for me right now. Since I have a brand new engine with Ocean being built right now the last thing I want is a faulty ECU damaging it.

Cococarbine3

iTrader: (1)

Take a spark plug out to see if fuel is puddling in the cylinder, that could be why it doesn't want to turn over. It may be that the 2 cylinders that weren't firing got too much fuel in them.

edit: yes, that is exactly what happened to me. I tried everything to get MS to work again, and the only solution that worked for me was to put the stock ECU back in.

falcon

iTrader: (13)

Now if that's the case, could that have damaged the engine?

Cococarbine3

iTrader: (1)

You should be okay. I don't think the starter motor has enough power to bend rods or do damage if the cylinders are fluid locked.

If you have a stim, you can test MS to check your ignition. In my case it was only firing for one bank of injectors. I was unable to figure out why.

falcon

iTrader: (13)

I don't have a stim... I may have to bust down to Bellingham and get wayne_curr to test it for me.

Jeff_Ciesielski

iTrader: (10)

Check the connections at the patch harness. You probably have a loose wire or two. I've had that happen before where moving the ECU around cracked the solder joints and caused the car to not run.

falcon

iTrader: (13)

I guessed that might be what's wrong. That was the first thing I was going to check but I ran out of daylight.

wayne_curr

iTrader: (8)

What happened to me had nothing to do with a faulty megasquirt. What happened is the TPS connector on the factory harness fell off causing the wires to short together. This tells the megasquirt to lock all the injectors open. I doubt this happened to you.

Its too hard to speculate on what went wrong without more troubleshooting. Unfortunately i'm working til 10:30 every night til my days off sunday/monday.

I thought you had another car...?

falcon

iTrader: (13)

I do. My sister has been using it for the last month or so. Her car broke down so I lent it to her.

I'm going to check the connections on the sub harness tonite.

wayne_curr

iTrader: (8)

I would be pretty surprised if there was something wrong with that harness but you might as well check everything at this point. I guess I cant really imagine what else would be wrong at this point.

Did you bang the megasquirt around or drop it or something?

falcon

iTrader: (13)

No I was very careful with it when I had it out of the car. Specifically because I didn't want to do anythign to it.

I did mount the box basically 180* opposite from before. So I had to twist the harness around 180* to match it. So who knows, something may have come loose.

falcon

iTrader: (13)

Well I pulled the coils, plugs and unplugged the injectors and turned the car over.

You should have SEEN the amount of fuel that came shooting out of cyl 2 and 3. It covered my engine bay in fuel and half my driveway.

I'm letting it air out overnight. And will pick up new plugs tommorow.

I checked all the connections on the patch harness and they are all fine. No touching of one to another from twisting it.

So the only logical conclusion is a problem with the MS or two of the 4 of my coils happened to **** the bed at exactly the same time I did the re-location of the MS. I am trying to locate a local Stim and if I can't find one I'll head down to Bellingham and throw it on wayne_currs. Since 2 and 3 fire together (I think?) I'm guessing my spark output is messed up somehow.

Cococarbine3

iTrader: (1)

Wow déjà vu. I'm not sure what coils you have, but if you have stock, using a multimeter you can check the resistance between the coil towers on the 2 coils. Resistance between the terminals should be 8.7k-12.9k ohms at 20 degrees C. I don't think that's your problem though.

I bet something is up with your spark output on MS. I wish I could help you but I possibly have the same problem myself. I have a thread about it somewhere, but I'm too tired to link.

falcon

iTrader: (13)

I'm running Toyota COPS.