97 TAHOE 5.7L VORTEC WON'T START...GM Merlin ideas?

[rhandwor]

I repaired the link scroll down to read.
http://www.automotiveforums.com/t370...g_problem.html

[bigbluefan]

Originally Posted by rhandwor

Auto Zone and Advanced Auto have loaner fuel pressure testers.
Are you getting any sign of your anti theft system being on a man spent hours on the forum and his would start run around 1 minute and then shut down. After reading all of your problems I would at least watch your light for an indication.
This truck also has a fuel pressure regulator. I never heard of an ignition pressure regulator.
Use a noid light try Advanced or Auto Zone for a loaner. I think the anti theft will shut off power to the injectors.

I replaced the fuel pressure regulator this weekend and it still won't run or start. I was told that I might need to replace my fuel pump oil pressure switch or reset my ECM. If I do have to reset my ECM does anyone know how to reset it ?

[rhandwor]

I repaired the link scroll down on a previous post.
http://www.automotiveforums.com/t698...g_problem.html
This is another link.

[j cAT]

Originally Posted by bigbluefan

how can you find out if you have low fuel pressure ? I just replaced my fuel pump and fuel filter

key on engine off what is the fuel pressure ?

[bigbluefan]

Has anyone ever heard of the oil pressure fuel pump switch? and do you know where it is located on a 2000 Chevrolet Tahoe 5.7 liter engine limited edition Z71 ? and can anyone tell me what is the sensor that is directly under the distributor called ?

[rhandwor]

Originally Posted by bigbluefan

Has anyone ever heard of the oil pressure fuel pump switch? and do you know where it is located on a 2000 Chevrolet Tahoe 5.7 liter engine limited edition Z71 ? and can anyone tell me what is the sensor that is directly under the distributor called ?

Http://www.rockauto.com/ Put in your data and look at the picture.
You said you have good spark so your distributor is good. If you have a wiring diagram it should be in your Haynes manual.
A 1998 Tahoe 5.7L Oil Pressure sensor is top center rear of engine behind distributor.
Camshaft position sensor in distributor.
Lay a finger on the fuel pump relay you can feel it click when someone else is cranking engine.

[j cAT]

Originally Posted by bigbluefan

Has anyone ever heard of the oil pressure fuel pump switch? and do you know where it is located on a 2000 Chevrolet Tahoe 5.7 liter engine limited edition Z71 ? and can anyone tell me what is the sensor that is directly under the distributor called ?

get fuel pressure gauge on fuel rail what is the pressure.

oil switch does nothing on a cold start , after cranking then the oil safety switch will kill the fuel pump.

if you measure no pressure key on engine off then check all fuses. remove connector to pump see if you have voltage at pump .

you test pump before installing ?

[bigbluefan]

Originally Posted by j cAT

get fuel pressure gauge on fuel rail what is the pressure.

oil switch does nothing on a cold start , after cranking then the oil safety switch will kill the fuel pump.

if you measure no pressure key on engine off then check all fuses. remove connector to pump see if you have voltage at pump .

you test pump before installing ?

J cAT, yes after my fuel pump was replaced I drove it for a few weeks. and when I try to start it you can hear the fuel pump click on

[rhandwor]

If you have a 12 volt test and a small Gem clip clip the test light ground clamp on the gem clip.
Unplug an injector and put the gem clip on one terminal and the other terminal put the test light tip.
Have you wife or someone else crank the engine. Does the test light blink. Post the results.

[bigbluefan]

rhandwor , Would the fuel pump relay cause it to not start ?

[rhandwor]

Originally Posted by bigbluefan

Would the fuel pump relay cause it to not start ?

Yes

[bigbluefan]

rhandwor, ok checked the fuel pump relay its working properly. I'm running out of things to check ? any ideas of what it could be

[rhandwor]

Originally Posted by bigbluefan

rhandwor, ok checked the fuel pump relay its working properly. I'm running out of things to check ? any ideas of what it could be

I sent you a link on noid lights and scanner.
You can go to GM dealer and purchase a new key switch tell them yours gives wrong readings. They will sell it to you and you can install it. Remember to pull air bag fuse.
Disconnect battery ground. After its installed program it by method in links.
Try a new key it may work.
A lock smith will come to your home and repair it for you. The $29.95 scanner will give you a code for passlock I would suggest using it before trying above.
Check the injectors if they don't pulse the engine won't run.
The few testers I sent you a link for are cheaper than one of the parts you installed.

[j cAT]

Originally Posted by bigbluefan

J cAT, yes after my fuel pump was replaced I drove it for a few weeks. and when I try to start it you can hear the fuel pump click on

this is my last response to you . what is the fuel pressure ?

[rkvons]

Originally Posted by j cAT

this is my last response to you . what is the fuel pressure ?

bigbluefan,
Let me translate this for you: j cAT has asked you this at least three times and you have not provided an answer. He will not ask again and will not help anymore if he does not get the answer. The way this forum works is, people here help others to diagnose their vehicle's issues. The result of diagnosis is information. That information is used to continue the diagnosis. j cAT is a huge resource.