2002 Chevrolet Express Engine

Tiny
JVREPAIR
  • MEMBER
  • 2002 CHEVROLET EXPRESS
  • 5.0L
  • V8
  • RWD
  • AUTOMATIC
  • 160,000 MILES
The problem that I am having is that it seems to me that the injectors are not working and I would like to know if you guys have a solution? The car has spark and the engine is good, 60 pound pressure in the fuel pump and I put starter fluid and the car runs so I think that the problem is coming from the injectors.
Do you
have the same problem?
Yes
No
Tuesday, May 26th, 2015 AT 7:35 PM

5 Replies

Tiny
WRENCHTECH
  • EXPERT
Does the check engine light come on for bulb check when the key is first turned on?

Are the injectors receiving power supply with the key on?

Can you use a noid light to check for injector pulse?

https://www.2carpros.com/images/external/1Noidlightpair__.jpg
Was this
answer
helpful?
Yes
No
Wednesday, May 27th, 2015 AT 2:22 AM
Tiny
JVREPAIR
  • MEMBER
I used the Noid light and there is spark pulse, and everything else that you told me to check is a yes as well. I would like to know if you guys could help me with this problem. Also I was wondering if you guys could supply me with the diagram for the fuel pump to the ignition switch.
Was this
answer
helpful?
Yes
No
Wednesday, May 27th, 2015 AT 7:25 PM
Tiny
WRENCHTECH
  • EXPERT
You are giving me conflicting information. Why do you want a fuel pump diagram if you have 60 PSI of fuel pressure? If you had correct fuel pressure and injector pulse, you engine would be running so something is wrong with you testing. It is time to start over.

All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.

Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.

2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.

3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
Was this
answer
helpful?
Yes
No
Thursday, May 28th, 2015 AT 2:03 AM
Tiny
JVREPAIR
  • MEMBER
Everything that you mentioned are good on this engine and that's why I am confused on why it is not starting! This is the second engine I put on this can do you think if the timing is off it causes the car not to start or if they gave me a 5.7 engine instead of a 5.0 will that be a cause as well? And how could I check if the engine I have is 5.7 or 5.0 because from experience I know they look similar! Thanks
Was this
answer
helpful?
Yes
No
Thursday, May 28th, 2015 AT 3:21 PM
Tiny
WRENCHTECH
  • EXPERT
Now you say it's a replaced engine and you don't even know what engine it is?

You need to check this thing for stored trouble codes.

The ignition timing is not adjustable. If the distributor is installed in the wrong position, it will throw the ignition out of synch with the injectors and that will set a P1345 code.

If that's not the case, then you haven't tested correctly.
Was this
answer
helpful?
Yes
No
Thursday, May 28th, 2015 AT 3:34 PM

Please login or register to post a reply.

Recommended Guides