pcm reprogram
#22
Last ditch effort! Ive taken the car to dealership to have diagnostic ran they checked the pcm and it is fine, they said the wiring was at fault but to diagnose it it would be 600 for 4 hours of work. So i brought it home and replaced the engine wire harness with one i know was a working one. To no avail the damn car runs for 15 or so min and dies. I have no idea what my next step is any advice will help before i just give up and part it out?
#23
#24
update.. ive replaced the 02 sensors and both the cam position sensors and it still dies. Something just doesnt make sense i lose injector pulse but nothing else it still has spark it has power to the injector. Ive tried another pcm and same issue, i changed the harness and same issue. Ive checked the resistance of injectors cold and they average 12 ohms, when hot they are over 13 ohms, is that to much resistance? Could the injectors be drawing too much current and overheating the driver? Thats the only thing i can think of the injectors are the only things not replaced.
#25
I'd stop spending $$$ changing parts and use OBD (post #23 & others). Start with LTFTs, and check every sensor you can (ECT, IAT, ...) for plausibility.
Or follow the rest of #23.
The snag is that you know someone's messed with it so almost any weird thing could be wrong - could be something that never happens with any other 4.0.
Unless they put in a full set of the wrong injectors I don't see how all 8 could go bad in the same way and all at once i.e. I think you're heading in the wrong direction to suspect them.
For it to be something in common for all 8 you'd be looking for something like a wiring fault where heat or vibration upsets it. Most things on these cars are live and when activated pulled down to ground so you'd be looking at the live (have power available) all the time not the ground side. You can see this clearly in the Electrical Guide, which is essential.
Or follow the rest of #23.
The snag is that you know someone's messed with it so almost any weird thing could be wrong - could be something that never happens with any other 4.0.
Unless they put in a full set of the wrong injectors I don't see how all 8 could go bad in the same way and all at once i.e. I think you're heading in the wrong direction to suspect them.
For it to be something in common for all 8 you'd be looking for something like a wiring fault where heat or vibration upsets it. Most things on these cars are live and when activated pulled down to ground so you'd be looking at the live (have power available) all the time not the ground side. You can see this clearly in the Electrical Guide, which is essential.
Last edited by JagV8; 10-22-2015 at 08:41 AM.
#26
I'd stop spending $$$ changing parts and use OBD (post #23 & others). Start with LTFTs, and check every sensor you can (ECT, IAT, ...) for plausibility.
Or follow the rest of #23.
The snag is that you know someone's messed with it so almost any weird thing could be wrong - could be something that never happens with any other 4.0.
Unless they put in a full set of the wrong injectors I don't see how all 8 could go bad in the same way and all at once i.e. I think you're heading in the wrong direction to suspect them.
For it to be something in common for all 8 you'd be looking for something like a wiring fault where heat or vibration upsets it. Most things on these cars are live and when activated pulled down to ground so you'd be looking at the live not the ground side.
Or follow the rest of #23.
The snag is that you know someone's messed with it so almost any weird thing could be wrong - could be something that never happens with any other 4.0.
Unless they put in a full set of the wrong injectors I don't see how all 8 could go bad in the same way and all at once i.e. I think you're heading in the wrong direction to suspect them.
For it to be something in common for all 8 you'd be looking for something like a wiring fault where heat or vibration upsets it. Most things on these cars are live and when activated pulled down to ground so you'd be looking at the live not the ground side.
#27
#29
#30
#31
#32
#34
#36
#37
#38
Update...
I finally got the fuel trims fixed. Vacuum leaks plus bad maf sensor. But it didn't fix my dying issue. One thing i did notice is the temperature gets to 228 but the guage reads right in the middle. The fan comes on but the temp doesn't drop much maybe a couple degrees. it has new temp ect sensor.
I finally got the fuel trims fixed. Vacuum leaks plus bad maf sensor. But it didn't fix my dying issue. One thing i did notice is the temperature gets to 228 but the guage reads right in the middle. The fan comes on but the temp doesn't drop much maybe a couple degrees. it has new temp ect sensor.
#39
#40
The Fuel trims are both close to zero. Between 0.0 and 1.0. I'm using an actron scanner. But I'm getting no hot air when heat is on think the dccv is bad.