Won't start

Tiny
KYIHQUEEN@YAHOO.COM
  • 1995 CHEVROLET TAHOE
  • 220,000 MILES

95 tahoe tbi not getting gas out of injectors. Have new computer, fuel pump, filter, regulator, injectors. No diagnostic codes.

Do you
have the same problem?
Yes
No
Monday, September 5th, 2011 AT 5:36 PM

21 Replies

Tiny
SATURNTECH9
  • EXPERT
  • 30,860 POSTS

Have you tested your fuel pressure after replacing the fuel pump?Have you tested the injector harnesses for a injector pluse with a noid light?Any codes?

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 5:46 PM
Tiny
KYIHQUEEN@YAHOO.COM
  • MEMBER

I have not checked fuel pressure or pulse.
I have voltage though. If there is no pulse what would the problem be? I have a new computer.

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 6:03 PM
Tiny
KYIHQUEEN@YAHOO.COM
  • MEMBER

I have not checked fuel pressure or for pulse. It has a new computer. If no pulse what is the problem? There is no codes.

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 6:09 PM
Tiny
KYIHQUEEN@YAHOO.COM
  • MEMBER

There is no dia codes.

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 6:11 PM
Tiny
SATURNTECH9
  • EXPERT
  • 30,860 POSTS

So the first thing I need you to do is check with a fuel pressure with a pressure gauge. Then use a noid light to check for injector pluse. When you loose injector pluse its caused by no power feed to the injectors faulty wiring to the injectors terminal tightness bad ecm. So you have power to the injectors with the key on?Also get back to me about the other things I asked you to check.

Was this
answer
helpful?
Yes
No
-1
Monday, September 5th, 2011 AT 6:22 PM
Tiny
KYIHQUEEN@YAHOO.COM
  • MEMBER

Yes I have power to injectors with key on, but that is with a volt meter. I have a new ecm.

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 6:44 PM
Tiny
SATURNTECH9
  • EXPERT
  • 30,860 POSTS

Alright give me the results of the other things I asked you to check when you get them.

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 6:54 PM
Tiny
KYIHQUEEN@YAHOO.COM
  • MEMBER

Okay, I hooked up a noid light and it does not pulse or light up.

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 8:18 PM
Tiny
KYIHQUEEN@YAHOO.COM
  • MEMBER

I have 12 psi, but after a minute the pump cuts off and won't restart unless you turn off
then back on.

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 9:08 PM
Tiny
SATURNTECH9
  • EXPERT
  • 30,860 POSTS

12 psi is way to low of fuel pressure so you have two problems did you put in a new ecm or a used one?If you put in a new one did you program it?

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 9:20 PM
Tiny
SATURNTECH9
  • EXPERT
  • 30,860 POSTS

So when you changed the ecm did you put a used one in or a new one?

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 9:27 PM
Tiny
KYIHQUEEN@YAHOO.COM
  • MEMBER

According to the book, 10 to 13 is the fuel pressure for 95 tbi.
I got one from oreily's and put my eprom in it. It was for my 95 tahoe 4x4 5.7 w/auto trans

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 9:33 PM
Tiny
CADIEMAN
  • MEMBER

You need to check the injecter fuses. If there blown youll have know pulse. You have done everything else.

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 9:49 PM
Tiny
SATURNTECH9
  • EXPERT
  • 30,860 POSTS

You are correct iam used to most of the fuel injected engines are like 40psi plus. If you have power to one side of the injector and no flashing light from the noid light then there is a issue with the pulsing ground signal from the ecm to the injector you will have to see what the resistance is from the ecm conector to the injector connector.

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 9:53 PM
Tiny
SATURNTECH9
  • EXPERT
  • 30,860 POSTS

He already said he checked and had power at the injector now he needs to see why he doesnt have the pulsing ground from the ecm.

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 9:56 PM
Tiny
KYIHQUEEN@YAHOO.COM
  • MEMBER

How do I do that?

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 9:57 PM
Tiny
KYIHQUEEN@YAHOO.COM
  • MEMBER

How do I check for the pulsing ground?

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 10:04 PM
Tiny
CADIEMAN
  • MEMBER

Put the noid light to the injecter harness the light will pulse. When you are cranking the engine check it at the injecter connecter.

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 10:26 PM
Tiny
SATURNTECH9
  • EXPERT
  • 30,860 POSTS

He already checked that as well he got no light or flash thats how we know there is trouble with the flashing ground from the ecm. With the key off you would take your multimeter put it on low ohms scale 200 ohms and test with the injector unplugged from the injector harness ground pulse not the power side then take the other lead and hook it to the wire at the ecm with the connector unplugged and the key off. You should 2ohms or less.

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 10:46 PM
Tiny
KYIHQUEEN@YAHOO.COM
  • MEMBER

Found the problem. No signal from distributor connection bad at dis. It now runs.

Was this
answer
helpful?
Yes
No
Monday, September 5th, 2011 AT 10:51 PM

Please login or register to post a reply.

Related Engine Not Starting Questions

Recommended articles