MS2-Misfiring
#1
MS2-Misfiring
I have a '99 with 1.8 motor, Toyota COPs and turbo, running a MSPNP.
Here's the issue: I parked the car 4 days ago after driving home from work; the car has been running pretty much flawlessly with the MS tuned with VEAL. The next day I started the car up and noticed that it was misfiring pretty noticeably, so I took it for a quick drive around the block and the misfiring didn't go away through the rpm range. I thought that the tune may have gotten corrupted somehow, so I ran VEAL again and it enriched the entire fuel map by and avg of about 10 pts. The fuel map is incredibly messed up now, so the tune that I attached has that awful map that resulted from running VEAL after the misfire started.
I figured it had to be something other than the MS at that point, so I checked each of the COPs and spark plugs. All 4 sparked without a hitch when I pulled each individual coil and spark plug and cranked the motor. I checked the fuel system and didn't notice any leaks or anything out of the ordinary. I pulled the filter off the turbo and it looked like it was rotating normally.
Fuel, air and spark all seem to be there, I'm wondering if there may be something wrong with the MS picking up a signal or a sensor going out. I'm not ruling out that it couldn't be a mechanical/electrical problem that is causing the misfire, though.
I ran a quick log driving down the street, and I'm hoping that someone will be able to see something in the log that I'm missing.
Thanks in advance for any help!
Here's the issue: I parked the car 4 days ago after driving home from work; the car has been running pretty much flawlessly with the MS tuned with VEAL. The next day I started the car up and noticed that it was misfiring pretty noticeably, so I took it for a quick drive around the block and the misfiring didn't go away through the rpm range. I thought that the tune may have gotten corrupted somehow, so I ran VEAL again and it enriched the entire fuel map by and avg of about 10 pts. The fuel map is incredibly messed up now, so the tune that I attached has that awful map that resulted from running VEAL after the misfire started.
I figured it had to be something other than the MS at that point, so I checked each of the COPs and spark plugs. All 4 sparked without a hitch when I pulled each individual coil and spark plug and cranked the motor. I checked the fuel system and didn't notice any leaks or anything out of the ordinary. I pulled the filter off the turbo and it looked like it was rotating normally.
Fuel, air and spark all seem to be there, I'm wondering if there may be something wrong with the MS picking up a signal or a sensor going out. I'm not ruling out that it couldn't be a mechanical/electrical problem that is causing the misfire, though.
I ran a quick log driving down the street, and I'm hoping that someone will be able to see something in the log that I'm missing.
Thanks in advance for any help!
Last edited by ShadowZ; 07-24-2012 at 12:10 AM.
#4
I checked all of the wiring connections for the injectors and COPs, checked all vacuum lines.
I put everything back together to see if anything changed with the misfire, and when I started the car, the motor started idling at 3000 rpm, and the misfiring is still there. I immediately thought that it could be a vacuum leak, but I've checked all the lines and can't find one.
I'm totally at a loss what the issue is now...
I put everything back together to see if anything changed with the misfire, and when I started the car, the motor started idling at 3000 rpm, and the misfiring is still there. I immediately thought that it could be a vacuum leak, but I've checked all the lines and can't find one.
I'm totally at a loss what the issue is now...
#10
On the injector connectors, there's a white/blue wire that is shared by all 4 connectors. The other wire on each connector is a different color for each one.
I was looking through a wiring diagram, and it looks like the white/blue wire connects to the main relay and the 4 other wires go straight into the ECU.
I need to check them individually again, but should both wires in each connector have a constant 12v?
I was looking through a wiring diagram, and it looks like the white/blue wire connects to the main relay and the 4 other wires go straight into the ECU.
I need to check them individually again, but should both wires in each connector have a constant 12v?
#11
Boost Czar
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no. one is power, the other is a switched ground from the MS, that activates the coil.
all injectors should see 12v, and the MS provides the ground.
this will determine if it's an issue with the injector drivers on the MS, or the engine harness/fuses.
all injectors should see 12v, and the MS provides the ground.
this will determine if it's an issue with the injector drivers on the MS, or the engine harness/fuses.
#12
Did another test with a better 12v test light, and the white/blue wire is getting 12v to each injector, but the other wire for each connector is not getting 12v. Now it looks like all 4 injectors aren't getting a signal from the MS, but the white/blue wire is getting a solid 12v.
I checked the voltage of each one with the COPs unplugged, while cranking the motor.
I checked the voltage of each one with the COPs unplugged, while cranking the motor.