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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29434
Experience:  GM Grand Master Technician 2007. 14 years experience.
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2004 chevy 3500 wont start

This answer was rated:

2004 chevy 3500 wont start
Chat Conversation Started
GM Tech (Cam) :

Welcome

GM Tech (Cam) :

We are in a live chat window now.

GM Tech (Cam) :

I will do my best to assist you. When you are finished please click on accept only if you are satisfied. I don't get paid unless you do.Please do not accept if you cannot leave positive feedback. I don't know if you are a tech or a just working on your own vehicle so we may have to fine tune the answer. I only know as much about your problem as you have told me in your post, so my answers will be based on what you tell me so please add all the details you can.

Customer:

i am a tech

GM Tech (Cam) :

OK, check engine light on when you turn the key on?

GM Tech (Cam) :

Is the pressure there when cranking?

Customer:

no. was for mulit missfires

Customer:

55 lbs

GM Tech (Cam) :

plugged exhaust?

GM Tech (Cam) :

leaking intake gaskets?

GM Tech (Cam) :

or was the pressure low?

Customer:

changed gaskets on intake

Customer:

pressure was fine

Customer:

o2 were both changed

Customer:

exhaust is clear checked that too

GM Tech (Cam) :

crank sensor?

GM Tech (Cam) :

map reading?

Customer:

all sensors reading

Customer:

can prime injectors with scanner will run fora bit

GM Tech (Cam) :

security?

Customer:

noid lights up

Customer:

off

GM Tech (Cam) :

global reset?

GM Tech (Cam) :

Take the battery cables off the battery, hold the ends together for 10 seconds then attach them to the battery and see what happens. This will reset the whole vehicle.

Customer:

miss fire was jumping all around before

Customer:

will try that..why would noid light?

GM Tech (Cam) :

no codes? even if you can keep it running with carb cleaner or something?

GM Tech (Cam) :

Not sure about the noid light. IF that does not work, I would be tempted to try a crank sensor;.

Customer:

havent tried to keep running with carb clean

Customer:

spark ok and noid flashes why crank?

GM Tech (Cam) :

may be worth a try to get the RPM high enough so some of the tests can run.

GM Tech (Cam) :

Weak signal may be firing at the wrong time.

GM Tech (Cam) :

Seen it a few times.

Customer:

10-4

Customer:

ok ill give it a shot

Customer:

would crank sensor make miss fire jump to different cyls.it was doing that 1 the 7 then 2 then none/

GM Tech (Cam) :

let me know.

GM Tech (Cam) :

YEs, when they go, it feels like the pump is failing

Customer:

ok going home to drink heavy ill try in am..lol

GM Tech (Cam) :

ok

GM Tech (Cam) :

You can reply at any time for follow up information regarding this issue, even after you accept my answer and I will reply.

Customer:

thanks

GM Tech (Cam) and other Chevy Specialists are ready to help you