Need a pro to Diagnose

Schurkey · Nov 17, 2018

Engine cranks at normal speed? The engine ground is good.

Engine needs four things to run.
1. A burnable air-fuel mixture
2. Strong spark at the proper time
3. Adequate cranking compression
4. Relatively free-flowing exhaust

Far as I can tell, you've verified the cranking compression.

"Good fuel pressure" does not guarantee a proper amount of fuel spraying from the injectors. Do you have fuel spraying from the injectors?

"Good cap, rotor, plug wires and plugs" does not guarantee strong spark across the plug gap. Do you have spark TO the plugs? Are the plugs fouled? Worn?

I don't see that you've checked for a blocked exhaust system at all.

Ryan Moilanen · Nov 18, 2018

Schurkey said:
Engine cranks at normal speed? The engine ground is good.

Engine needs four things to run.
1. A burnable air-fuel mixture
2. Strong spark at the proper time
3. Adequate cranking compression
4. Relatively free-flowing exhaust

Far as I can tell, you've verified the cranking compression.

"Good fuel pressure" does not guarantee a proper amount of fuel spraying from the injectors. Do you have fuel spraying from the injectors?

"Good cap, rotor, plug wires and plugs" does not guarantee strong spark across the plug gap. Do you have spark TO the plugs? Are the plugs fouled? Worn?

I don't see that you've checked for a blocked exhaust system at all.

Brand new cap and rotor might be bad? I have also hooked a spark plug light indicator I’m getting spark

Ryan Moilanen · Nov 18, 2018

The shop verified I am getting the correct amount of psi for fuel

Ryan Moilanen · Nov 18, 2018

How do I check for blocked exhaust.. sometimes it will backfire when trying to start

Urambo Tauro · Nov 18, 2018

Pressure gauge. A vacuum gauge will work if it displays positive pressures. Take readings while the engine is running.

The hard part is tapping into the piping in order to attach the gauge. If you remove an oxygen sensor, you can screw an adapter into the sensor bung. Alternatively, you could drill a hole that will snugly fit a short section of brake tubing (tap it in with a hammer); of course the hole will have to be patched afterward...

Unless the spec varies by application, I believe you should be looking for no more than 1.25 PSI @ idle, or up to 3 PSI @ 2000 RPM.

c1500deathtrap · Nov 18, 2018

will it start on ether? do you have spark? are your injectors actually injecting? Just try starting on starting fluid, if it fires and you can keep it running with the starter fluid, you know you have spark and compression.

c1500deathtrap · Nov 18, 2018

Why can't this shop do any kind of troubleshooting?

c1500deathtrap · Nov 18, 2018

Ryan Moilanen said:
How do I check for blocked exhaust.. sometimes it will backfire when trying to start

Define backfire, like is it firing out of the intake? Only way for that to happen is bad ignition timing.

east302 · Nov 18, 2018

c1500deathtrap said:
Why can't this shop do any kind of troubleshooting?

Agreed. These are very basic steps that the shop should have taken.

Sent from my iPhone using Tapatalk

Ryan Moilanen · Nov 18, 2018

Yeah I will definitely not be going back to that shop waste of 100$ diog fee..if I add starting fluid it will shoot out my manifold with fire..

Need a pro to Diagnose

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