2 cylenders running rich
07-14-2006, 03:36 PM
#1
Thread Starter
Join Date: Jul 2006
Posts: 7
2 cylenders running rich
Hey there, got a problem cant seem to figure out.
My #2 & #4 plugs are fouling out. Bad. The other 6 are running good.
I switched the injectors, and plugs, and it still on the same 2 cylenders. I mannualy pressurized the intake system to 20pis and no leaks. Spark is good. Compression test matched the other cylenders with only a 2% difference between all eight. I am kind of stumped. Any Ideas?
Here are a list of the mods.
93 hard top
331ci
level 10 dss machine work on block
h beam rods
Probe dised -14cc pistons
gasket matched y303 heads
e cam
performer rpm intake
long tubes
main girdle
7 qt road race pan
windage tray
spec 4 clutch
3.73 gear
alum driveshaft & flywheel
t56 6 speed
42# injectors
76 mass air
NGK v plugs heat range 7
vortech t trim 15-18 psi
AFM powere pipe
255l fuel pump
trex fuel pump
msd 6462 btm
9mm wires
msd coil
My #2 & #4 plugs are fouling out. Bad. The other 6 are running good.
I switched the injectors, and plugs, and it still on the same 2 cylenders. I mannualy pressurized the intake system to 20pis and no leaks. Spark is good. Compression test matched the other cylenders with only a 2% difference between all eight. I am kind of stumped. Any Ideas?
Here are a list of the mods.
93 hard top
331ci
level 10 dss machine work on block
h beam rods
Probe dised -14cc pistons
gasket matched y303 heads
e cam
performer rpm intake
long tubes
main girdle
7 qt road race pan
windage tray
spec 4 clutch
3.73 gear
alum driveshaft & flywheel
t56 6 speed
42# injectors
76 mass air
NGK v plugs heat range 7
vortech t trim 15-18 psi
AFM powere pipe
255l fuel pump
trex fuel pump
msd 6462 btm
9mm wires
msd coil
07-14-2006, 04:05 PM
#4
5th Gear Member
Join Date: Feb 2006
Location:
Posts: 2,524
RE: 2 cylenders running rich
so you said you checked the power and and ground for the injector? if 2 cylinders only are running rich it would most likely be a leaking injector on those 2 cylinders. but you ruled that out. the only other thing i could think is the eec is pulsing those 2 injectors too often, and i wouldnt know why it would think to do that? are you running o2 sensors on your exhaust set up?
07-14-2006, 04:07 PM
#5
3rd Gear Member
Join Date: May 2006
Location:
Posts: 792
RE: 2 cylenders running rich
ORIGINAL: Jester331
Checked the wires (switched them around), cap and rotor are new as well. plugs are gapped at .33 as well to prevend high pressure blowout. fuel pressure is set to about 43 static.
Checked the wires (switched them around), cap and rotor are new as well. plugs are gapped at .33 as well to prevend high pressure blowout. fuel pressure is set to about 43 static.
arent 5.0 plugs supposed to be gapped around .55?
07-14-2006, 04:09 PM
#6
6th Gear Member
Join Date: Feb 2006
Location:
Posts: 5,263
RE: 2 cylenders running rich
not with a blower
ORIGINAL: boss429
arent 5.0 plugs supposed to be gapped around .55?
ORIGINAL: Jester331
Checked the wires (switched them around), cap and rotor are new as well. plugs are gapped at .33 as well to prevend high pressure blowout. fuel pressure is set to about 43 static.
Checked the wires (switched them around), cap and rotor are new as well. plugs are gapped at .33 as well to prevend high pressure blowout. fuel pressure is set to about 43 static.
arent 5.0 plugs supposed to be gapped around .55?
07-14-2006, 04:13 PM
#7
Thread Starter
Join Date: Jul 2006
Posts: 7
RE: 2 cylenders running rich
I am running a new 02 sensor on 1 through 4 side. If an adjustment was being made by the eec for an 02 issue, I would think it would be on 1 through 4, not just 2 and for.
I do think the eec is almost double firing those two injectors as I listend to them with a stehescope (sp?) before and after I switched the injectors to different locations.
gap on boosted cars should be less to prevent spark blowout.
Keep the ideas comming.....
I do think the eec is almost double firing those two injectors as I listend to them with a stehescope (sp?) before and after I switched the injectors to different locations.
gap on boosted cars should be less to prevent spark blowout.
Keep the ideas comming.....
07-14-2006, 04:16 PM
#8
3rd Gear Member
Join Date: May 2006
Location:
Posts: 792
RE: 2 cylenders running rich
ORIGINAL: r.barn
not with a blower
not with a blower
ORIGINAL: boss429
arent 5.0 plugs supposed to be gapped around .55?
ORIGINAL: Jester331
Checked the wires (switched them around), cap and rotor are new as well. plugs are gapped at .33 as well to prevend high pressure blowout. fuel pressure is set to about 43 static.
Checked the wires (switched them around), cap and rotor are new as well. plugs are gapped at .33 as well to prevend high pressure blowout. fuel pressure is set to about 43 static.
arent 5.0 plugs supposed to be gapped around .55?
haha my bad everyone
07-14-2006, 04:21 PM
#9
5th Gear Member
Join Date: Feb 2006
Location:
Posts: 2,524
RE: 2 cylenders running rich
ORIGINAL: Jester331
I am running a new 02 sensor on 1 through 4 side. If an adjustment was being made by the eec for an 02 issue, I would think it would be on 1 through 4, not just 2 and for.
I do think the eec is almost double firing those two injectors as I listend to them with a stehescope (sp?) before and after I switched the injectors to different locations.
gap on boosted cars should be less to prevent spark blowout.
Keep the ideas comming.....
I am running a new 02 sensor on 1 through 4 side. If an adjustment was being made by the eec for an 02 issue, I would think it would be on 1 through 4, not just 2 and for.
I do think the eec is almost double firing those two injectors as I listend to them with a stehescope (sp?) before and after I switched the injectors to different locations.
gap on boosted cars should be less to prevent spark blowout.
Keep the ideas comming.....
