Misfires came back but I'm sure the maf is the problem. Will update when I have new maf and o2 sensors. Also need to get my exhaust checked for cracks

 

make sure its land rover oem and not an autozone/advance/pepboys type model, there seems to be a high reported early failure rate for that particular sensor on these cars.

unless it was running abnormally rich or lean, i dont think youd get missfires from o2 or exhuast leaks... but keep at it. replace the rubber oring in line with the air cleaner assembly, they tend to pinch or dryrot over time.

 

O2 sensors can cause misfires, combine that with ao bad maf and you got a big problem

 

ive never seen it to the extent of a stalling motor unless there are far more issues... with no o2 data or maf even plugged in it should still start and run sustained, the ecu falls back on preset data charts for assumed fuel and timing...rich and retarded haha but running.

 

I mentioned earlier in the thread that my throttle cable and cruise cables were both really loose, after tightening both of those cables my truck isn't stalling anymore. Now I'm having some issues with misfires which I think is being caused by a bad maf and bad o2s. What do you think?

 

O2's will NOT cause a mis fire BUT a misfire WILL cause O2 codes.

The MAF meters the air coming into the engine, it will NOT cause mis fires.

Loose throttle cable will NOT cause mis fires, the throttle cable is not even used while at idle.
At idle the throttle is completely closed (thats what the spring does, closes the throttle) and the idle air control valve allows enough air into the engine for it to idle.

 

Not sure where you got that info but your wrong.

 

Just wanted to do an update because I know some people have had issues with their whole bank misfiring either left or right. I changed both front o2 sensors which fixed my whole left bank misfiring issue. Now that i took care of the misfires I have new codes
P0171 and p0174
I'm think I have an exhaust leak but won't know until I check tomorrow, will update after checking

 

The ECU believes your rich/lean automatic adjustment is beyond the +/- 22.7% range it can adapt to, this is the "fra value outside limits" multiplicative factor. Codes indicate lean on each bank.

From Bosch guide to ECU for those codes:

Adaptive Control

Drifts and faults in the sensors and actuators of the fuel delivery system, as well as un-metered air leakage into the intake system influence the

primary control. This causes deviations in the air to fuel ratio. The adaptive control determines the controller correction in two different ranges.

Lambda deviations in range 2 are compensated by a multiplicative factor.

Each value is determined only within its corresponding range. But each adaptive value corrects the primary control within the whole load and speed
range of the engine. After the next start, the stored adaptive values are included in the calculation of the primary fuel control; just before closed-loop

fuelling control is activated.

So it could be something a simple as a vac leak or leak of any kind between MAF and engine, and while you are hunting it may want to also clean out the PCV vent system from each valve cover.

Translated from the original Klingon - Aye Captain, we'll use the readings from the last trip to set the fuel/air mix just before we make the jump to warp speed.

 

Thanks savannah that was very helpful. I noticed I'm missing the o ring between my maf and intake box but don't think that's my problem. It's just strange because these codes haven't popped up before the o2s were changed. I'll check my lines/ clean what you said and update my progress.