Misfiring

Good morning,

This could be from injectors that are are not flowing fuel or enough fuel into the engine from being clogged. There is no additive that will clean them. With the age of the truck, they may have to be replaced. I attached the procedure below for removing the fuel manifold for you.

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

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

Also, I attached the wiring diagram for you as well for the ignition system. With the key in the on position, check the voltage at the positive side of the coil for battery voltage.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Roy

Good morning.I even put fuel in the card and it still does not start.I just got a brand new coil and still yet.i do not know what else to do.I pretty much put everything brand new; fuel pump, two of them, brand new distributor, brand new coil, and it does not want to run.even if I poor gas in the carburetor it wants to start but pop a little. I checked the fuel leader and it has a lot of pressure.

Okay, did you verify voltage to the coil as I suggested in the previous post?

I would also check the compression to be sure the timing is correct. You should have 140 -160 pounds.

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

Roy

Yes, I got compression. Timing is correct.and I just got a brand new coil.

What is the compression?

What is the voltage at the coil that I requested?

Roy

It's 150 compression.never check the coil yet.

Let me know the results.

Roy

Thank you so much.I really appreciate it.

It's not popping now just crank.

You are welcome.

Always glad to help.

Roy

So wired, it does not pop now.I can't get a tester right now.they don't have it in stock where I live in Maui.I have strong blue spark though.

Okay, let me know when you get the tester so we can do some voltage checks.

Roy

Okay, I will do.it's weird because it used to pop when try cranking and now it doesn't at all.

Okay, sounds good.

https://www.2carpros.com/articles/engine-backfires-while-running

Roy

Is there any other MSD ignition discharge 6a.6200 that I can use besides the same kind?

Let us cross one bridge at a time. I still need results on voltage checks to determine the reason for this not running.

Roy

Hey buddy.thank you.don't have any power to none of it .so I'm waiting for get a new MSD then I can check the voltage like you ask. There is no power going into it at all the wire is dead goes to the coil it comes from the MSD ignition discharge box.

It should come from the ignition switch to the MSD box. Did you verify this?

Roy

I'll send you a picture when i crank the motor the power should have.but there is not.only get power on the the MSD no power coming out from the MSD.

Okay, take a few and post them for me to see.

Roy

Hey Roy I'm sorry but this site is slow. can you ten if if can?8082839342.and I can send you pictures.

I got no power coming out wen I crank the motor.

Power coming out of where?

I wish you would go back to basics and do some voltage testing instead of jumping all over the place.

Roy

Okay, so what I did is bypass the msd box.so I'm back to square one.have power on coil and now it's back to wanna start .it's little popping so will see if get plan fuel.

Use a test light on the negative side of the coil. While cranking, the test light should flash.

Roy

Yes I got power now.so will try an set the timing again.

We had it on 154.now we going try 13726548.

Again, you are all over the place. Can you tell me if the test light flashes on the negative side with the engine cranking?

Roy

Yes it does.

This thing is slow responding.

Okay, then the module and pick-up coil are good.

I have responded in minutes when you post.

The backfiring usually comes from the timing. Did you set the distributor on number 1 compression when you installed it?

Roy

Yes I did that.

Recheck it as you may have it in 180 degrees out.

Roy

Rechecked the number one compression/distributor.

Correct. And make sure the rotor is pointing to the number 1 cylinder in the cap.

Roy

Yes it's on number one an jus pop..even if we out gas in side.what we did is try jump the fuel pump for more fuel an it did the same.

I understand but if you have fuel and spark, the only thing left is either compression or timing. It is one of those 2 items.

Roy

Yes.I will keep trying an see what happens,.ther is 2 firing orders.

Can you please send me a link with the
Find order? so I can see if it's the same and with the distributor cap numbers and wires please.

Only one for the 460. I posted it below.

The other firing order was for the 5.8 motors.

Roy