265 Hemi to efi

[Charlescrown]

202 might be onto it. It also is triggering code 34 map signal low. I would have thought it would be going into limp mode with a value that low and getting a substituted value to keep it running but that don't seem to be the case.
This may help.

[Holden202T]

i dont know how much difference it will make as it looks like 20kpa and 100kpa row of the ve table are very close values, but none the less its an issue that needs to be fixed.

[Charlescrown]

I did comment way back I didn't like the VE tables. It just keeps climbing way past maximum torque so must be dumping a ton of fuel in. Also the boost VE along with the boost multiplier table. Anyway that's further down the track. Theres also a hole in the timing map @3500rpm.

[heff0018]

The map should be starting at 100kpa or there abouts and drop some amount during cranking. If its like 9.5, that would only be possible under a hard overrun down hill with the throttle closed to even get close to that low Kpa reading, basically a very strong vacuum!

I would be checking out that map sensor. I have seen this sort of failure before in Falcons commonly. They barely can even run and any tiny throttle and they just die, the ECU thinks the car is under a hard vac so basically bugger all fuel is even delivered. But 9.5Kpa in on a whole other level of crazy vacuum, so if that is indeed the real value the ECU is seeing, it wouldn't run due to close to no fuel being commanded.

Thanks, does anyone have a recommended replacement MAP Sensor?

Something I just thought of that is that even though the plugs have blackened during all this attempted start process they have definitely not been wet. Maybe that's why it was able to run on starting fluid way back in the early stages as that was the only fuel the engine was getting. Problem is I have other ignition/spark issues now and maybe I have cooked the coil from leaving the ignition on for too long.

[heff0018]

202 might be onto it. It also is triggering code 34 map signal low. I would have thought it would be going into limp mode with a value that low and getting a substituted value to keep it running but that don't seem to be the case.
This may help.

Thanks for the pdf's Charles.

[Charlescrown]

At least test the MAP sensor to make sure your heading in the right direction. Leave the MAP plugged in and back probe the plug key on engine off should have 5 volt positive, negative and about 1.6 out. I expect there is either a voltage drop to the MAP or a dead MAP. If the supply voltage is low it may be a wiring problem or ECU but I doubt it's an ECU problem because all the other 5 volt supply look OK. If the supply is low put your multimeter on the MAP negative and battery negative to check for a bad earth circuit. Should be less than 0.2 volts. If you have a Camira wiring loom the Black is earth grey is positive and green is the output voltage.

[heff0018]

At least test the MAP sensor to make sure your heading in the right direction. Leave the MAP plugged in and back probe the plug key on engine off should have 5 volt positive, negative and about 1.6 out. I expect there is either a voltage drop to the MAP or a dead MAP. If the supply voltage is low it may be a wiring problem or ECU but I doubt it's an ECU problem because all the other 5 volt supply look OK. If the supply is low put your multimeter on the MAP negative and battery negative to check for a bad earth circuit. Should be less than 0.2 volts. If you have a Camira wiring loom the Black is earth grey is positive and green is the output voltage.

Thanks for the explanation Charles, that's a bit easier for me to understand and follow than the diagnostic chart.

[heff0018]

Voltages tested all good, the grey positive 4.95v, the green output 1.59v and the black earth was 0.1v. Does this point to a dead MAP sensor even though the output is 1.6v? Thanks

[heff0018]

202 might be onto it. It also is triggering code 34 map signal low. I would have thought it would be going into limp mode with a value that low and getting a substituted value to keep it running but that don't seem to be the case.
This may help.

This is odd, I just put it into diagnostic mode and only got code 12.

[vlad01]

If you have had the power disconnected, the codes might be cleared and back to 12.

I could be wrong, but I thought the map would be either close to 0 or close to that 5V depending on which way they are at "rest" so to speak.

That voltage is somewhere towards one end of the scale, presumably the end it is reading in TP as high vac.