[96f350travis]

so I swapped the engine in my 96 f350 this spring and the first fire it wasn't firing on the right side I used the engine harness from the original engine first i checked the valve cover gaskets and they didn't look burnt or anything tested them for a short and didn't find any next I pull the plug from the idm and ohmed the harness and injector solenoids and got 3.4 ohms from all eight. next i check the ground Sheild wires and they come back good so i replaced the idm and the same issue next i replaced the engine harness with a known good one that was unmolested issue still exists. so i tried another idm still no fix. i tried replacing the four injectors with four out of the old motor that i know worked still no fix. i checked the ground on the radiator support and the inner fenders and they are good. my question is can old codes keep the idm from working properly or is there and communication between the pcm and the idm the other thing i notice towards the end the tach doesn't move till it fires and u got to crank a long time before it fires. no smoke what so ever. from what i was told it ran good before pulled and that it was a ford reman with 160,000 miles on it. Any help would be appreciated thanks

 

[White95f250]

Did you replace the valve cover gaskets and UVCH?

Have you tried a buzz test?

 

[96f350travis]

Did you replace the valve cover gaskets and UVCH?

Have you tried a buzz test?

i did replace valve cover gaskets and uvchs on both sides and look for some with a scanner to buzz test and try to pull codes

 

[96f350travis]

i did replace valve cover gaskets and uvchs on both sides and look for some with a scanner to buzz test and try to pull codes

also the four injectors i swapped i know are good so not sure a buzz test will tell me anything

 

[White95f250]

Buzz test will tell you if the electrical side is good or not and you can trace the signal disconnect from there.

 

[96f350travis]

Buzz test will tell you if the electrical side is good or not and you can trace the signal disconnect from there.

Buzz test will tell you if the electrical side is good or not and you can trace the signal disconnect from there.

ok i know when u use a test light hooke to the positive on the battery and test the signal wires in the harness plugs it dont shown ant signal

 

[White95f250]

Signal where? You need to do a buzz test. Are all fuses good?

 

[96f350travis]

Fuses are good I use to be able to feed power to the signal wire for each injector and it would show the signal with a test light I had an old mechanic that taught me that

 

[96f350travis]

That was at the connector that plugs into the valve cover gaskets the center wire is the power feed for 2 injectors and the signal wire for each injector is on each side of that and then the outside 2 wires are for the glow plugs

 

[White95f250]

You got the right idea but it doesn't quite work like that.

You need to do a buzz test to send the signal to the injector. You can check resistance to each injector using a procedure @Patrick Feeley posts but a buzz test will allow you to audibly hear each injector.

 

[Patrick Feeley]

Here's what I use (you probably don't need to do the glowplug portions): To check the injector/glowplug wiring: From each valvecover gasket connection's outermost pins (2 per connector) to ground you should get 0.1 to 2 ohms (indicates good plug and wiring). From each valvecover gasket connection's center pin to each immediately adjacent pin, you should get around 3 ohms (indicates good injector solenoid and wiring). You should not get any continuity from any of the outer pins to the 3 inner pins (indicates no shorts between injector and glowplug wiring). You should also get 0 to 1 ohms from each of the external harness connectors outer pins back to the Glowplug Relay's large terminal on the GP side (indicates good wiring from external connections back to the relay).

Cheers!

 

[96f350travis]

So i got a scanner on it today and buzz tested it only bank 2 tested nothing from bank 1 and got a idm fault and a injector high side open circuit bank 1 codes which means I have a bad connection some where correct?

 

[White95f250]

If you've tried a known good IDM then you need to trace every wire to that side.