With the engine on it gives me these
22. Map/bp out of range
hego indicates too rich
there some more codes but i lost my list so i nd to retest
On a Koeo it give
51 coolant sensor voltage to high
ill have to get the rest when i get home

i did replace the map sensor a month ago and it used to be the reason why it wasnt starting up when i bought it but i always the code for it still and i never knew why

 

You need to get your list of codes or pull them again. Make sure they are in order also. If you have a bunch of sensor codes, then you could have a wiring problem. I think this was mentioned in your other thread. There are power supplies and grounds that are common to groups of sensors. If there is a problem with the power, you will get codes for all these sensors, even though the sensor themselves are good.

 

If get the list of codes you are getting. I highly doubt this a timing issue but more likely a wiring issue. It in all probability is an easy fix. Once you have the list of codes I can post a fairly quick diagnosis to check the wiring if that is the case. And a step by step for testing each sensor with a DVOM if it is not.

 

Ok here the full list of codes i get with koeo
12.rpm unable to hot upper limit of test ra ge
21. Ect out of self test range
22. Map or bp out of range
25.knock not sensed ignore
42.hego circut indicates system rich

 

but idk if those would keep it from running or not

 

Ok this is wiring problem I suspect All of these sensors plus the TPS use the same signal return in some calbrations so it is strange the TPS is not showing a fault. . The signal return is an EEC special ground. If this has a bad connection you truck will not run properly if at all.

We need to know the Year Engine and if an auto or not.

 

Its a 1986 ford f150 302 efi it wouldnt suprise me if it had a bad wiring since i heard from the preivous owner that i caught on fire once

 

Code 12 means your idle stop screw is out of adjustment or the throttle body is clogged with gunk.

Code 21 means the computer thought the engine was less than 50 degrees, or more than 250 degrees temp. If the engine was within these temps when the codes were pulled, you need to check for 5 volts. The guy in the book says you can also check for 5v at the tps sensor, just to make sure it's not a computer problem.

Code 22 means the computer is not receiving the signal from the MAP sensor or it was out of range.

code 25 means the knock sensor signal was not received during the goose test. Did you perform the goose test when you were told to do so? I would not worry about this code so much right now.

code 42 means the voltage remained too high from the oxygen sensor. I would get the other codes fixed first before worrying about this code. That is why you try to fix the codes in order, the more important ones are first and they can affect the later codes.

 

First thing that should be done is to confirm the wiring. You have replaced the MAP so I would start there as it unlikely it has failed they generally do not fail to begin with.

You are going to have to pull the plug off the ECU for testing purposes.

Disconnect the MAP and check for continuity on the black and white wire to socket 46 on the ECU plug
Do the same for the TPS disconnect it and test to socket 46.
Check for continuity between the TPS plug and the MAP sensor plug on the orange & white wire. If this fails repair the circuit and continue on testing..
Disconnect the ECT and check for continuity on the black and white wire to socket 46 on the ECU plug
Disconnect the Knock Sensor and check for continuity on the black and white wire to socket 46 on the ECU plug
Disconnect the ACT and check for continuity on the black and white wire to socket 46 on the ECU plug
Disconnect the EGR position sensor and check for continuity on the black and white wire to socket 46 on the ECU plug

If any of these tests fail the Signal Return cicuit will need repair.

Do this testing and report back.

 

Ok i retest to see if i skip any and i got
koeo test
12. System cant rasie idle above normal idle
21. Ect loss of signal during operation
22. Map not at normal vaccum
23. Tps out of self test
24.Act not at normal level/Edis failure in coil 1
25. Knock not sensed
32.problems with egr valve controlling
34.egr bot opening
35.egr out of self test
42.ego voltage always rich
57.Nps open circuit

would that all be a ground issue or something eles i know once the scanner bypasses a certain code it runs fine

 

All of these sensors use the signal return the problem is likely a fault in the signal return circuit that is what they all have in common.
Im starting to sound like a broken record here you need to test the circuit. NOTHING is going to get fixed or sorted until you do that.

Also be sure to test the signal test to chassis ground with the ECU unplugged.


Your testing squance should be like this

. Disconnect the ECU and check for continuity on socket 46 to chassis ground there should be no continuity, if there is there a ground fault in the harness.
Disconnect the MAP and check for continuity on the black and white wire to socket 46 on the ECU plug
Do the same for the TPS disconnect it and test to socket 46.
Check for continuity between the TPS plug and the MAP sensor plug on the orange & white wire. If this fails repair the circuit and continue on testing..
Disconnect the ECT and check for continuity on the black and white wire to socket 46 on the ECU plug
Disconnect the Knock Sensor and check for continuity on the black and white wire to socket 46 on the ECU plug
Disconnect the ACT and check for continuity on the black and white wire to socket 46 on the ECU plug
Disconnect the EGR position sensor and check for continuity on the black and white wire to socket 46 on the ECU plug

If any of these tests fail the Signal Return cicuit will need repair.

Do this testing and report back

 

Ok i did the test and i found
egr isnt getting full continuity
tps has continuity except the green
ect isnt getting full continuity
pin 46 black/white wire isnt getting continuity
act isnt getting full continuity

so im guessin theres a bad wire somewhere?

 

Well you found your problem/s The sig return has a break somewhere in the harness.

Next step

Check for continuity between the sensors on the signal return (the black and white) this will narrow down if the splice point has failed or the issue is further along in the harness.
If that test fails the splice point has failed.
If that checks out. The break is between the splice point and the and the ECU plug.
This test will narrow down where in the harness to start looking.
It is going to mean opening up the harness regardless eventually

The splice point in the circuit for the sig return for the sensors is near the ECT so if this test fails open up the harness starting from the ECT follow the sig return until you find the splice point and repair as necessary. Then retest the sensors continutiy to the ECU plug.

 

I would like to offer you another theory on this, there is a single ground wire that goes directly from the battery negative to the ecm which I think also provides a ground for all the sensors. If this wire is disconnected or loose it will do all kinds of crazy stuff. I think you are on the right track with what you're doing but that battery ground is something you should check for sure

 

Good thing to check but with the last round of tests it has confirmed their is an issue in the signal return circuit from the sensors to the ECU