fastsc92
Registered User
Just got my car back on the road again after a few years and recently I've had a no-start condition that is confusing me.
The car runs and drives like a champ 98% of the time. However, there is a strange no start condition that I can't figure out. If the car has been running and I go into a store or just turn the car off for a short amount of time, ocassionally, it wont want to start or idle, and smells like raw gas when cranking. This is confirmed when the wideband reads 10.0 on the display. If I reset the battery for a few minutes and try it again, all is good.
I did notice something strange when this occurs. When I have this no start condition, my datalogger will not work. The wideband has a stand-alone display, but it will not transmit any signals to my laptop. Upon further inspection, if I probe the wires used as signal taps into the logger such as MAF, TPS, ACT, etc....all read a voltage of 2.15V from the ECU with the key on engine off.
Once the battery is reset, signals read normal, the logger works, and the car starts up without any issue. This doesn't do it all the time, it's hit or miss when this no-start issue happens.
The car has an EEC tuner board, and a PLXwideband/datalogger. All signal taps are made at the ECU harness, soldered and heat shrunk, and a 5amp fuse is installed in series to the unit. The fuse never trips, so I'm assuming the logger is not the issue especially if the computer is outputing 2.15 volts on those specific signals.
The battery is in the trunk and the grounds are good, and I can't see any issues from that area. This is really the only change that I've made since before the car was running fine. I've used #2 welding cable for the main power, grounded to a solid point in the trunk, cut-off switch is breaking the positive coil wire.
I'm out of ideas on this one. Would a bad connection at the tuner board cause this issue? A bad ECU? Is the cut-off the culprit? I used 16awg to run the coil signal to the switch. This may be too small of a guage, but it doesn't explain why the computer would have a strange output and no-start. Any ideas or comments??
The car runs and drives like a champ 98% of the time. However, there is a strange no start condition that I can't figure out. If the car has been running and I go into a store or just turn the car off for a short amount of time, ocassionally, it wont want to start or idle, and smells like raw gas when cranking. This is confirmed when the wideband reads 10.0 on the display. If I reset the battery for a few minutes and try it again, all is good.
I did notice something strange when this occurs. When I have this no start condition, my datalogger will not work. The wideband has a stand-alone display, but it will not transmit any signals to my laptop. Upon further inspection, if I probe the wires used as signal taps into the logger such as MAF, TPS, ACT, etc....all read a voltage of 2.15V from the ECU with the key on engine off.
Once the battery is reset, signals read normal, the logger works, and the car starts up without any issue. This doesn't do it all the time, it's hit or miss when this no-start issue happens.
The car has an EEC tuner board, and a PLXwideband/datalogger. All signal taps are made at the ECU harness, soldered and heat shrunk, and a 5amp fuse is installed in series to the unit. The fuse never trips, so I'm assuming the logger is not the issue especially if the computer is outputing 2.15 volts on those specific signals.
The battery is in the trunk and the grounds are good, and I can't see any issues from that area. This is really the only change that I've made since before the car was running fine. I've used #2 welding cable for the main power, grounded to a solid point in the trunk, cut-off switch is breaking the positive coil wire.
I'm out of ideas on this one. Would a bad connection at the tuner board cause this issue? A bad ECU? Is the cut-off the culprit? I used 16awg to run the coil signal to the switch. This may be too small of a guage, but it doesn't explain why the computer would have a strange output and no-start. Any ideas or comments??