Cant get engine running. DTC 1336
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Cant get engine running. DTC 1336 OK so i just dropped in a 5.3 into my 80 Z28. I was told that the computer has been programmed to run without the emissions. Attempted to start the engine and just cranks. IT has spark. No injector pulse. Checked for codes with my shitty code reader and it has a code 1336. Will this shut down injector pulse? According to what i have read you have to have the engine running in order to do the crank relearn procedure. Any other ideas as to why i dont have an injector pulse? Also i dont have any O2s on yet but again i dont think this would stop the injectors from operating.
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You know what, never checked for power at the injectors. Will the injectors have power going to them all the time? Like how does that work? Does the pcm provide a ground when time to open the injector to inject the fuel?
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Yes, i do have power to my injectors. I just checked and yes there is also fuel too. Out of the harness i see three grounds that i attached to the bell housing. Do not see any other grounds out of the harness.
Yes the pcm triggers ground. You need to use a noid light to check for injector pulse as you crank the engine.
You check for spark? You have the ground on the back of the drivers side head hooked up?
EDIT: Never mind. Just saw you said it has spark..........
Fuel pressure? Can you hear the pump prime?
EDIT: Never mind. Just saw you said it has spark..........
Fuel pressure? Can you hear the pump prime?
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Yeah. May have to go get a noid light tomorrow. At this point i figure there is no pulse as the engine doesnt even hiccup. We put some raw fuel in the intake and it ran briefly. Someone has played with this harness and its a neat job they have done. I do have one wire left that has not been connected to anything and it is labelled TACH. WHich i think is the wire that would normally go to the cluster for tachometer operation. It is a long white wire. Think i could be wrong in this assumption?
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We have fuel pressure for sure. Large spray pattern from the rail test port. The injectors arent injecting fuel. Plugs are all dry. I think the pcm uses the cam sensor for reference as to when to fire the injector??? I have the cam sensor plugged in as i just checked that. I am going to have to find a scanner and see if i can find what is going on here. Is there a diagram somewhere where it shows what pins in the pcm power up or provide power/ground to the various sensors? If i had this i could check for continuity between the various sensors and make sure they all have the necessary wiring with good continuity. Also, i could make sure whoever worked on the pcm and wiring hopefully hasnt removed something they shouldnt have.
We have fuel pressure for sure. Large spray pattern from the rail test port. The injectors arent injecting fuel. Plugs are all dry. I think the pcm uses the cam sensor for reference as to when to fire the injector??? I have the cam sensor plugged in as i just checked that. I am going to have to find a scanner and see if i can find what is going on here. Is there a diagram somewhere where it shows what pins in the pcm power up or provide power/ground to the various sensors? If i had this i could check for continuity between the various sensors and make sure they all have the necessary wiring with good continuity. Also, i could make sure whoever worked on the pcm and wiring hopefully hasnt removed something they shouldnt have.
We have fuel pressure for sure. Large spray pattern from the rail test port. The injectors arent injecting fuel. Plugs are all dry. I think the pcm uses the cam sensor for reference as to when to fire the injector??? I have the cam sensor plugged in as i just checked that. I am going to have to find a scanner and see if i can find what is going on here. Is there a diagram somewhere where it shows what pins in the pcm power up or provide power/ground to the various sensors? If i had this i could check for continuity between the various sensors and make sure they all have the necessary wiring with good continuity. Also, i could make sure whoever worked on the pcm and wiring hopefully hasnt removed something they shouldnt have.
The cam sensor synchronizes the injectors, but it can run without it. You can unplug the sensor and it will start up.
Need a scanner for sure. That will tell you alot.
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Had a look with the scanner and found in the data it read
Fuel sys 1 open
Fuel sys 2 open
I am thinking this has something to do with it. NOt sure where to start from here though?
WHen i crank my timing adjusts and i do read an rpm. TPS is smooth. I checked for continuity between my injector...ummm.....ground feed wire i believe cause it does not have power when key on and the pcm connector and all have continuity. Also checked for power at the cam sensor and with key on one terminal has about 12v. Same with the injectors, their power feed is 12V also. Not sure if there is supposed to be a 5v reference in the 3 wires going to the cam sensor or not but the other 2 wires didnt read anything. Any further thoughts?
Fuel sys 1 open
Fuel sys 2 open
I am thinking this has something to do with it. NOt sure where to start from here though?
WHen i crank my timing adjusts and i do read an rpm. TPS is smooth. I checked for continuity between my injector...ummm.....ground feed wire i believe cause it does not have power when key on and the pcm connector and all have continuity. Also checked for power at the cam sensor and with key on one terminal has about 12v. Same with the injectors, their power feed is 12V also. Not sure if there is supposed to be a 5v reference in the 3 wires going to the cam sensor or not but the other 2 wires didnt read anything. Any further thoughts?
Had a look with the scanner and found in the data it read
Fuel sys 1 open
Fuel sys 2 open
I am thinking this has something to do with it. NOt sure where to start from here though?
WHen i crank my timing adjusts and i do read an rpm. TPS is smooth. I checked for continuity between my injector...ummm.....ground feed wire i believe cause it does not have power when key on and the pcm connector and all have continuity. Also checked for power at the cam sensor and with key on one terminal has about 12v. Same with the injectors, their power feed is 12V also. Not sure if there is supposed to be a 5v reference in the 3 wires going to the cam sensor or not but the other 2 wires didnt read anything. Any further thoughts?
Fuel sys 1 open
Fuel sys 2 open
I am thinking this has something to do with it. NOt sure where to start from here though?
WHen i crank my timing adjusts and i do read an rpm. TPS is smooth. I checked for continuity between my injector...ummm.....ground feed wire i believe cause it does not have power when key on and the pcm connector and all have continuity. Also checked for power at the cam sensor and with key on one terminal has about 12v. Same with the injectors, their power feed is 12V also. Not sure if there is supposed to be a 5v reference in the 3 wires going to the cam sensor or not but the other 2 wires didnt read anything. Any further thoughts?
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Yeah. PCM is pulsing. First couple pulses look strong then it weakens. Yes also for the cam sensor. 11.8 volts. I have 3 loops with ground wires attached that come out of the harness and i have those bolted to the block.
Strong pulse then it gets weaker sounds like a connection issue. 12volts on the cmp reference wire sounds like a bad pcm or a short on the positive side. Back probe the cmp sensor reference wire at the pcm and check the voltage. Also check some of the other ref wires on other sensors to see what kind of voltage they have.