fuel sys 1 - cl
fuel sys 2 - cl
calc load (%) 2.3
ect (*F) 188
stft b1 (%) 40
ltft b1 (%) 25
stft b2 (%) -1.5
ltft b2 (%) 7
map (inhg) 12.1
eng rpm 570-613
veh spped 0
spark adv 16-24
iat (*f) 64
maf (lb/min) .722
tps (%) 0
02s b1 s1 (v) .4-.8
stft b1 s1 (%) 28-36
02s b1 s2 (v) .6
stft b1 s2 (%) n/a
02s b1 s3 (v) .5
stft b1 s3 (%) n/a
02s b2 s1 (v) .3-.8
stft b2 s2 (%) -1.5-1.5

don't know if it really means anything but i noticed the oil pressure is a lot higher than usual it normally sits about 40 at idle now its at 60

 

Bank 1, (Driver side) cyls 1, 3, & 5, fuel trim is extremely lean, and the PCM is adding fuel "trying" to compensate.


Bank 2, (passenger side) cyls 2, 4, & 6, fuel trim is a tad rich, not to worry.


The odd part is B1S1 and B2S1 oxygen sensors are reporting fairly well.


MAF .722 pounds per second: (~327 grams per second) roughly half of what it should be. The MAF will affect both banks evenly though, and yet the fuel trims are not even close to each other. Make sure the arrow showing the direction of air flow on the side of the MAF is correct. Possibly a leak in the air inlet tube between the MAF and the throttle body, or the O ring where the air inlet tube seals to the throttle body, or as mentioned earlier, a vacuum leak... somewhere. The thing to keep in mind with a lean mixture, is there is either too much air, or not enough fuel, or a little of both. Pull the injector plug off and check that all 12 pins are straight, and not bent over. Could also be a kinked/restricted fuel line to an injector. An injector balance test would detect it but, that requires a bi-directional scan tool. I'm trying to give you "work arounds" to avoid needing the high $ scanner.


Definitely something going on, and quite possibly two or more problems. Are you sure P1345 is not in memory? Have you checked camshaft retard? Are all of the ground wires on the rear of the cylinder heads good and tight? ...just trying to locate the missing puzzle piece.

 

i would love to see the outcome of this as i am having the exact same symptoms....... i am going out now to try some of these test also....

Im getting a nasty sputter at idle and hesitation on acceleration but once the rpms are up it runs great... stinks like hell and im getting 100km less a tank

I started by replacing the 2 upstream o2 sensors because the heater was gone in one

fuel pressure is good and way back i did the intake gasket and spider upgrade, and fuel pump

found a vac leak on the hvac hose, replaced hose but found atf in the old one (diff zoo of problems)
I plugged off both hvac and 4x4 hoses at the check t-valve to eliminate any vac leak sources in the diaphragm actuators..

I replaced plugs and wires, cap, and rotor all with dialectic gresse

yesterday i pulled the dizzy to find a nasty looking gear so replaced the dizzy with a good one

changed coil and module


with the engine warm and at idle

LTFT1 25%
O2 B1S1 .31v

LTFT2 -3.91%
O2 B2S1 .89v

O2 B1S2 .78V

MAF 4.8g/s

Codes are: P0171 System too lean (bank1)
P0300 Random/Multiple cylinder misfire detected



IM suspecting that after i changed the o2s and it ran crapy for another 2 months before i changed the slew of other stuff, maybe the new o2s are carboned up from the running rich???

 

definitely do not have that code the only one i have had the whole time is p0300 with a flashing engine light

i have not checked cam retard yet as i would like to be able to drive it there so i don't have to pay for a tow there and back

when i get some time in the daylight i will try these new ideas

pretty sure maf is in correct direction but i will double check

what do you think about my oil pressure going up so high all of a sudden i have never seen it that high at idle before

 

Ok checked maf it was in the right direction everything on the air intake seems to be sealed pretty good also

Checked with propane again still nothing

Ground strap looks good

Injector connector is in good shape

I'm getting very frustrated with this

 

Disconnect the air inlet from the air box and add propane, or carb cleaner, (not starting fluid) directly into the MAF sensor while the engine is idling. While you're adding it, watch the oxygen sensor voltages, especially B1S1. They should both increase to approximately .9 volts.

 

I did that once already and I'm pretty sure the voltage went down but I will try it again tomorrow

Should the engine be up to temp for closed loop or does it matter ?

 

Yes, you did this one once before, (humor me ) Has to be at operating temp, and in closed loop. Check it at idle and at 2Krpm. Voltage on both sensors must go up to ~.9 volts.

 

Ok similar results on both tests idle and 2k

Numbers jumped around quite a bit but with propane at maf the highest I saw for both sensors was .960

They fluctuated anywhere from .02 - .960
Stayed a little higher when propane was added

Also noticed maf open loop was 2.25
But when it went closed loop it dropped to .77
And at 2k it goes back to 2.25
Not sure if this means anything

 

While you were injecting the propane, did both sensors remain at .9 volts?