LS1TECH - Camaro and Firebird Forum Discussion

LT1-LT4 Modifications 1993-97 Gen II Small Block V8

LT1 runs rich after open loop

Thread Tools
 
Search this Thread
 
Old 07-04-2014, 10:47 AM
  #1  
11 Second Club
Thread Starter
iTrader: (3)
 
Greg Pippin's Avatar
 
Join Date: Mar 2008
Location: Golsdboro, NC
Posts: 227
Likes: 0
Received 0 Likes on 0 Posts
Default LT1 runs rich after open loop
After heads and cam swap the car cranks perfict and runs great. The idle slowly raises to 1400-1500 rpm and will stay. After car warms up and goes into open loop it starts dumping fuel and you cant keep the car running. You can cut the car off and wait 10 minutes and it will crank and run fine for 5 minutes and will start dumping fuel again.
Mods are cam, afr heads, ported intake, 58mm throttle body, headders, 37#injectors, 255 fuel pump.
New: coolant temp sensor, iac, coil, opti spark, plugs and wires
Greg Pippin is offline  
Reply Like
Old 07-04-2014, 01:47 PM
  #2  
On The Tree
iTrader: (9)
 
FrankieD's Avatar
 
Join Date: Dec 2008
Location: Richmond Hill, Ont, Canada
Posts: 148
Received 11 Likes on 10 Posts

Default
check the TPS . seems that you may have the idle set screw too high causing the throttle blades to be open too much. You should have a TPS voltage reading at about 0.56 volts at idle with an IAC reading around 50.
FrankieD is offline  
Reply Like
Old 07-04-2014, 01:49 PM
  #3  
That's MISTER MODERATOR
iTrader: (9)
 
Paul Bell's Avatar
 
Join Date: Nov 2005
Location: NYC
Posts: 7,585
Received 42 Likes on 36 Posts

Default
It may be trying to "learn" the IAC. Is it a low cost aftermarket part?
Paul Bell is offline  
Reply Like
Old 07-04-2014, 02:46 PM
  #4  
11 Second Club
Thread Starter
iTrader: (3)
 
Greg Pippin's Avatar
 
Join Date: Mar 2008
Location: Golsdboro, NC
Posts: 227
Likes: 0
Received 0 Likes on 0 Posts
Default
Originally Posted by FrankieD
check the TPS . seems that you may have the idle set screw too high causing the throttle blades to be open too much. You should have a TPS voltage reading at about 0.56 volts at idle with an IAC reading around 50.
The tps is reading fine and the iac count is around 50
Greg Pippin is offline  
Reply Like
Old 07-04-2014, 02:47 PM
  #5  
11 Second Club
Thread Starter
iTrader: (3)
 
Greg Pippin's Avatar
 
Join Date: Mar 2008
Location: Golsdboro, NC
Posts: 227
Likes: 0
Received 0 Likes on 0 Posts
Default
Originally Posted by Paul Bell
It may be trying to "learn" the IAC. Is it a low cost aftermarket part?
It does it with both new and old iac
Greg Pippin is offline  
Reply Like
Old 07-07-2014, 12:56 PM
  #6  
11 Second Club
Thread Starter
iTrader: (3)
 
Greg Pippin's Avatar
 
Join Date: Mar 2008
Location: Golsdboro, NC
Posts: 227
Likes: 0
Received 0 Likes on 0 Posts
Default
Bump....
Greg Pippin is offline  
Reply Like
Back to Subforum
LT1-LT4 Modifications
View Next Unread
Overheating




Advanced Search
Quick Reply: LT1 runs rich after open loop


Reply Closed Thread Share

All times are GMT -5. The time now is 06:13 PM.