Crank no start

Good afternoon,

The fact that it runs with the fluid tells me it is a fuel delivery issue.

https://www.2carpros.com/articles/car-cranks-but-wont-start

Can you hear the pump run with the key on for 2 seconds? I would also verify the pressure to be sure.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Are there any codes set?

The ECM controls the injector firing sequence. You need to test and see if the ECM is commanding the injectors to fire with a noid light.

Roy

Hi,

That is where I would start. Also, if you haven't checked the fuel pressure, do that. The pump may be working but not providing the needed pressure (even though it is new).

Here is a link that will explain how to test the injectors for a pulse. Do this and let me know the results.

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Let me know what you find.

Joe

first off before I did anything with the injectors I tested every one of my sensors they are supposed to be 5 volts they were all 4.9 volts. does that mean my PCM could be bad or could have failed?

Not at all. 4.9 is good.

Did you test the pressure?

Roy

I haven't tested the pressure yet. I don't have a special attachment because there's no valve on my fuel rail.

You can rent a tester at a parts store that will have the needed adapters for this procedure.

Roy

Sounds good. I'll see what I can do.

Keep us updated.

Roy

like i said before the fuel pump and regulator is new, but when i checked it for pressure i did not get any. but the pump is running when i turn the key to on position. what next and thank you?

Okay, if the pump is running and there is no pressure you are either out of fuel or the new pump is no good.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Roy

My mistake. I had the pump relay un hooked. It's getting between 50 and 55 psi and the injectors are pulsating but still won't start. I've ruled out the PCM failing and the crank sensor is new and working properly. That's as far as I've gotten. Thank you

Okay, did you verify spark to the plugs?

If you have spark, then check the compression to be sure the timing belt has not failed.

https://www.2carpros.com/articles/how-to-test-engine-compression

https://www.2carpros.com/articles/how-a-timing-belt-works

Roy

I have not checked for spark, but I have used starting fluid in the vehicle started up and then shut off.

Okay, then you have spark.

Back to compression.

The fact it started tells me this is still a fuel issue.

Did you use a noid light to verify the injectors are allowing fuel into the cylinders?

Roy

I only had a test light but I'll get some noid lights soon. Another thing I forgot to mention is when the car did run it would run until operating temperature then would shut down and I'd have to wait until the next day to start it again. but eventually it gave up and never started again.

Okay, keep me updated.

Roy

I started testing the injectors wire coming from the PCM harness plug and found 2 wires bared and arcing on one another and taped them up and then went to test the fuse in the power relay box under the hood and found out that it was a blown fuse. so I put a new one in and the car started right up. Thank you gentlemen for all your help. Much appreciated.

Good find.

You are welcome.

Always glad to help.

Roy

I have another question about that car. after I got it started 3 coils are not firing and we've tested the coils and they're good so how do I trace down a break or something in wires?

Make sure there is battery voltage to one of the wires in the connector. The other wire goes to the ECM for grounding. When the ECM grounds that wire, the coil sends off spark.

Look for more damage to the ECM harness. It sounds like there is more damage somewhere.



Roy

I checked both wires on each coil connector and they are both getting 13 volts. is that normal?

I checked positive wire coming from the coil on the plug and it showed 13 volts. I also checked the ground wire on the plug coming from the PCM and it also shows 13 volts. is that normal? on all coils while the car is running number one two a number four coils are not firing in those cylinders, but when I switch them around they start firing.

Okay, it has power. The ECM is what grounds the wire back it based on the input from the crank sensor.

When you crank it, does the RPM go up on the tachometer? That will tell me if the crank sensor is sending a signal.

Roy

The tachometer is working.

I attached the diagram of the coils to the ECM. You need to the wiring to the ECM to be sure there is voltage to the connector.

Roy

Sorry I'm not tech literate when it comes to circuits and stuff like that. but if I have voltage coming to the ground wire on all of the coils from the PCM which is 13 volts what does that mean?

One more thing; if I'm wrong here then how do I check for signal from the PCM? I don't know if it's ohms or voltage or what it is.

No, the voltage goes to the ECM from the coils. If there is voltage there then the ECM is the issue.

Roy

Let me see if I'm getting this right. so if there is voltage at the connector to the PCM then the PCM is the issue, correct? because all of my coils have the same voltage on both wires and still 3 coils are not working.

Correct. The ECM inside circuitry is what controls the grounds for those 3 coils.

Roy

Okay. one more thing; is there a diagram of the plug I need to look at? because all my wires are discolored from age.

Sorry, I meant connector at the PCM.

I attached the diagram back a few posts and I highlighted the wires and the connector numbers for you.

Roy

Okay, I'll have somebody look at it for me and explain it to me because I don't know how to read those diagrams. but thank you and I'll let you know what I come up with.

You are welcome.

Always glad to help.

Roy

Do I need to unplug the connector to the coil before checking for voltage? I just realized that's where my voltage could come from on the ground wire.

No, leave it connected with the key on.

The voltage comes from the injector.

Roy

Okay, now I understand how it works. thank you so much.

I checked all the power wires going to the coils and none of them have a 5 volt reference. what do I do next?

You need battery voltage to the coils, not 5 volts.

The power comes from Fuse S in the under hood fuse block. Check for power on both sides of the fuse.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Roy