Quantcast




All times are UTC - 6 hours [ DST ]




Ask A Question Reply   
Author Message
 

contributions: 2
Hey y'all...
I just bought a 1992 GMC Sierra 1500 4x4 v8 5.3L.... Drove fine for 45 minutes then died on me (bought at an auction)... Now, when you try to crank it it backfires. It runs fine when being sprayed with starter fluid but then as soon as its out of starter fluid, back to the issues. Please please please help figure this out, my boyfriend and his dad are both mechanics and have never encountered this! Thanks so so so much in advance!


Share on FacebookShare on DiggShare on DeliciousShare on TechnoratiShare on TumblrShare on Google+
   
Reply with quote  
* Search   
 
User avatar

contributions: 2002
Images: 37
Location: Oregon
please, don't use starter fluid to keep an engine running. it could damage the engine. It sounds like you either don't have fuel or injector pulse. when you cycle the key from off to run have someone listen over by the gas tank. you should heat the fuel pump turn for 2 seconds. If you hear the fuel pump turn on you should check your fuel injector to see if they are shooting fuel out. if they are not, unplug one of the injectors and put a test light between the two terminals on the wire harness and see if the test light flashes when the engine is cranking. That will tell you is the computer is sending the signal to fire the injectors. once you know which part is not working you can figure what areas to look further


   
Reply with quote  
 

contributions: 2
So my boyfriend took the tbi apart and the fuel pressure regulator, cleaned it and put it back together so now it is running but idleing rough... Any guesses?


   
Reply with quote  
 
User avatar

contributions: 2002
Images: 37
Location: Oregon
you should measure the fuel pressure and volume. A bad fuel pump doesn't always stay dead. Many times a fuel pump that is on it's way out will stop functioning when it gets hot. (after running for a while) Then after sitting for a while they will run again. Have a shop do a current ramp test on the fuel pump. Looking at the current waveform of the fuel pump will show the condition of the electrical contacts inside the motor and can show the pump speed too.

Use a flashlight and look at the spray pattern out of the injectors. You should be able to see the spray out of the injector and it should be a very strong spray pattern that spreads out as it heads towards the throttle plate.


   
Reply with quote  
Ask A Question Reply   

   Similar Topics   Author   Replies   Views   Most Recent 
New Articles View the first 1988 GMC Sierra 1500 5.7 V8 High Idle,EGR not hooked up

in GMC Trucks

buddha131

1

1225

Sun Nov 22, 2015 5:58 pm

carriedi View the latest

New Articles View the first 2001 GMC sierra 1500 4x4 vibration in floor when acceleratin

in GMC Trucks

shackleferd33

1

1004

Wed Nov 25, 2015 1:51 am

carriedi View the latest

New Articles View the first 1992 GMC sonoma not starting

in GMC Trucks

1936chevy

1

1017

Mon Apr 06, 2015 5:49 pm

carriedi View the latest

New Articles View the first 1992 gmc safari won't start

in GMC Trucks

dpk53

3

1313

Mon Sep 15, 2014 9:09 pm

carriedi View the latest

New Articles View the first Attachment(s) 1992 Chev silverado A/C

in Chevy Silverado

stevep

4

1429

Wed Feb 18, 2015 8:35 am

stevep View the latest

New Articles View the first 1992 Chev Silverado Steering pump.

in Chevy Silverado

stevep

5

1412

Wed Apr 22, 2015 2:18 am

carriedi View the latest

New Articles View the first starter crank no start

in Chevy Trailblazer

Jimmyjoe101

1

435

Fri Oct 21, 2016 8:46 pm

carriedi View the latest


All times are UTC - 6 hours [ DST ]



Search for:
Jump to:  
Contact Us