94 explorer won't start
Thread Starter
|
New User
Joined: Jun 2004
Posts: 7
Likes: 0
94 explorer won't start
94 explorer 4.0L 2WD. It will turn over but not run.
Getting spark at all six cylinders at plug wire. Getting around 38psi fuel pressure at manifold. I can spray a little fuel through the throttle body and the engine will start. Any ideas would be greatly appreciated.
Getting spark at all six cylinders at plug wire. Getting around 38psi fuel pressure at manifold. I can spray a little fuel through the throttle body and the engine will start. Any ideas would be greatly appreciated.
Postmaster
Joined: Dec 2001
Posts: 3,742
Likes: 2
From: UT
Does the fuel pressure stay high while trying to start?
Does the fuel rail hold pressure when the pump isn't on?
Can you hear the fuel injectors opening?
I also wouldn't downplay the possibility of codes from the computer. Run the EEC-IV self-tests, just in case the computer has any input.
Does the fuel rail hold pressure when the pump isn't on?
Can you hear the fuel injectors opening?
I also wouldn't downplay the possibility of codes from the computer. Run the EEC-IV self-tests, just in case the computer has any input.
Thread Starter
|
New User
Joined: Jun 2004
Posts: 7
Likes: 0
I was trying to pull the codes with the analog meter and having a hard time determining the codes. The first 111 or maybe 11. Then something like 157 or 57. There is another one, but haven't made it that far.Any hints on getting the correct number?
It is holding pressure with the pump off. Haven't looked at if there is a drop in pressure. What should it be?
Haven't listened for the injectors, will do next.
It is holding pressure with the pump off. Haven't looked at if there is a drop in pressure. What should it be?
Haven't listened for the injectors, will do next.
Postmaster
Joined: Dec 2001
Posts: 3,742
Likes: 2
From: UT
On a '94, your codes should be three digit codes (111 instead of 11). During the KOEO test you should see:
1) After KOEO test is entered, solenoids will click and the fuel pump will run briefly as the computer tests a few items.
2) Fast codes are output, which will show up as a single, short voltage pulse. Ignore.
3) KOEO hard fault codes are output. Each code is output once, then these codes are output a second time
4) A pause followed by a single separator pulse.
5) Continuous memory codes are output just like the KOEO hard faults: all codes are output, then repeated.
6) After continuous memory codes are output, computer enters "output state" mode. Can be a useful diagnostic tool. At this point, each press of the accelerator changes the state of certain solenoids controlled by the computer (ie transmission solenoids, canister purge solenoid and others). If nothing else, it allows you to determine the test is done, as each press of the accelerator will also change the state of your voltmeter.
One last thought, If you are getting a pass code for the KOEO hard faults, move on to the KEOR test, before dealing with the continuous memory codes. There can be more/better information obtained from the KOER test.
1) After KOEO test is entered, solenoids will click and the fuel pump will run briefly as the computer tests a few items.
2) Fast codes are output, which will show up as a single, short voltage pulse. Ignore.
3) KOEO hard fault codes are output. Each code is output once, then these codes are output a second time
4) A pause followed by a single separator pulse.
5) Continuous memory codes are output just like the KOEO hard faults: all codes are output, then repeated.
6) After continuous memory codes are output, computer enters "output state" mode. Can be a useful diagnostic tool. At this point, each press of the accelerator changes the state of certain solenoids controlled by the computer (ie transmission solenoids, canister purge solenoid and others). If nothing else, it allows you to determine the test is done, as each press of the accelerator will also change the state of your voltmeter.
One last thought, If you are getting a pass code for the KOEO hard faults, move on to the KEOR test, before dealing with the continuous memory codes. There can be more/better information obtained from the KOER test.
Thread Starter
|
New User
Joined: Jun 2004
Posts: 7
Likes: 0
Thanks. I decided to call a mechanic who owes a favor. He is bringing his reader tonight. I was able to determine last night the injectors are not firing. So I am thinking either the crankshaft or camshaft position sensor. The only thing that concerns me is that the PCM was replaced 7k miles ago and I am wondering if it has gone out again.
