Fueling & Injection Fuel Pumps | Injectors | Rails | Regulators | Tanks

LQ9 starts but wont idle

Thread Tools
 
Search this Thread
 
Old 12-10-2013, 02:45 PM
  #1  
Staging Lane
Thread Starter
 
mountainman's Avatar
 
Join Date: Dec 2013
Location: British Columbia CANADA
Posts: 80
Likes: 0
Received 0 Likes on 0 Posts
Default LQ9 starts but wont idle

Just check fuel pressure, its at 54psi... I have read truck needs 58, is 4psi enough to cause this????
Old 12-10-2013, 09:21 PM
  #2  
TECH Enthusiast
 
703 CAMAROSS's Avatar
 
Join Date: Jun 2011
Posts: 589
Likes: 0
Received 2 Likes on 2 Posts
Default

No it should still idle. Did you change injectors?
Old 12-10-2013, 09:35 PM
  #3  
On The Tree
iTrader: (1)
 
x275radial's Avatar
 
Join Date: Apr 2012
Posts: 140
Likes: 0
Received 3 Likes on 2 Posts
Default

does it have an electric throttle body. also any codes pending.
Old 12-11-2013, 12:40 AM
  #4  
Staging Lane
Thread Starter
 
mountainman's Avatar
 
Join Date: Dec 2013
Location: British Columbia CANADA
Posts: 80
Likes: 0
Received 0 Likes on 0 Posts
Default

Stock injectors...tried.swapping intake, throttle body, maf, and tac module.
Electric throttle body and has throw lean code, and just tonight threw a crank position code. Motor is a swap that has never run for me yet. First time is started motor I had the brake booster unhooked, so thought maybe computer is trying to compensate by closing throttle body tight???
Old 12-11-2013, 12:23 PM
  #5  
TECH Enthusiast
 
703 CAMAROSS's Avatar
 
Join Date: Jun 2011
Posts: 589
Likes: 0
Received 2 Likes on 2 Posts
Default

If the crank position sensor is dropping out its not gonna run and will shut it's self off. Either you need a new crank sensor or you have a wiring issue with the sensor.
Old 12-11-2013, 01:01 PM
  #6  
Staging Lane
Thread Starter
 
mountainman's Avatar
 
Join Date: Dec 2013
Location: British Columbia CANADA
Posts: 80
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by 703 CAMAROSS
If the crank position sensor is dropping out its not gonna run and will shut it's self off. Either you need a new crank sensor or you have a wiring issue with the sensor.
Thats the confusing part.... if i put my foot on the gas pedal, I can get it to run and rev up....runs like crap mind you
Old 12-11-2013, 01:03 PM
  #7  
Staging Lane
Thread Starter
 
mountainman's Avatar
 
Join Date: Dec 2013
Location: British Columbia CANADA
Posts: 80
Likes: 0
Received 0 Likes on 0 Posts
Default

I have started it a bunch of times since it threw the crank code.... nothing, no more codes.... and most of the time i do have codes... the check engine light is not on?
Old 12-11-2013, 02:09 PM
  #8  
Staging Lane
Thread Starter
 
mountainman's Avatar
 
Join Date: Dec 2013
Location: British Columbia CANADA
Posts: 80
Likes: 0
Received 0 Likes on 0 Posts
Default

and if I put my foot on the gas pedal it runs. computer flash problem?



Quick Reply: LQ9 starts but wont idle



All times are GMT -5. The time now is 03:55 AM.