Need a pro to Diagnose

[Ryan Moilanen]

So I have a 99 k1500, 5.7 my truck one day just quit on me while driving.. I have replaced battery, cap, rotor, plugs, wires Are good, new crankshaft pos sensor, had the thing timed less than a year ago from a local shop, has compression I tested it almost 150 on all 8.. there is good fuel pressure.. I have an extra coil and icm swapped it out and still nothing.. I trying firing it up again today and it almost started for like a second but still nothing.. any direction would be awesome thanks in advance

 

[shorepatrol]

Did you check your grounds?

 

[east302]

What happens when you try to start it? Does it crank and not start (missing fuel, spark and/or air) or just click or do nothing at all (charging/starter issue).

When you turn the ignition to ‘run’, does the ‘Security’ light flash a few times and then go off?


Sent from my iPhone using Tapatalk

 

[Ryan Moilanen]

Hello, yeah it cranks but does not start..

 

[Ryan Moilanen]

Hello, yeah it cranks but does not start..

The security light goes away

 

[Wade]

So you have compression, just need to verify fuel and spark. You have fuel pressure, did you make sure there is fuel injected while cranking?

Check for spark at the plugs?

 

[Ryan Moilanen]

So you have compression, just need to verify fuel and spark. You have fuel pressure, did you make sure there is fuel injected while cranking?

Check for spark at the plugs?

I took it to a shop at first I thought it was my fuel pump.. still under warranty but they did verify it was working

 

[Ryan Moilanen]

I took it to a shop at first I thought it was my fuel pump.. still under warranty but they did verify it was working

The shop told me to get a new cap and rotor... I had a non-acdelco brand cap and rotor, they said to get the acdelco one so I did, they said it was cross firing in the cap.. I installed new acdelco and still nothing

 

[ChevyDan87]

Just to make sure jumper out the fuel pump in the fuse box to make sure it’s running

 

[Ryan Moilanen]

Just to make sure jumper out the fuel pump in the fuse box to make sure it’s running

Sorry what do you mean ?