ok all this truck is driving me nuts! i swear she is haunted!
codes are bank 2 is running lean
and
#2 cyl miss fire
which leads me to believe the ecu is going!

i look on the scan tool and o2 21 is reading 000
ok easy and cheap fix i get a band new one (even though i just replaced all 3, 4 months ago) for $10
no change so now i have 3 upper o2 sensors that work (swapped between banks to see if worked)
still shows lean on bank 2

and the miss fire code is just as confusing,
new wires, plugs in the the last 4 months
swapped plug wires, plugs and position on coil pack
then $20 later a new coil and still miss fire one #2 cyl

this is what leads me to believe the ecu is either haunted or getting ready to go out!

oh and i havent been in deep mud in over 6 months, and after, i went through and cleaned all conections

i drive a min of a 100 miles a day and when she is cold (70ish out side) she purres like a kitten but take a 50-150 drive and she idles like crap, aka the 2 codes

heat soaked ecm?

help!!!!!!

 

After run out let it cool down pull #2 plug whats it look like...pull another how does the tips look.....if its a 3.0 you never said? could be the O rings that go under the plastic intake or injector.......i had the same problem it was the stupid air flow meter, sprayed it with electrical cleaner fixed problem...and what codes do you have

 

all 6 plugs look good, nice light tan. yes a 3.0, i drive 500 - 1500 miles a week depends on where im working, the funny thing is for a cold start she purrs like a kitten, take her on a 50 mile stint on the interstate and come to the first stop light and she is missing! let her cool back off and fire her up and she purs again un till the next stop light then she is missing again! compression is good with all in 10% of highest cylinder which is 165

 

bank 2 lean code and cyl #2 missfire

 

starting to think fuel pressure or intermittent electical problem ...how is the fuel pressure and filter....have you cleaned MAF. Sensor

 

lol i over maintenance the truck as i drive a **** load of miles. new maf and new fuel pump in the the last year. and when i get in deep mud, i get home and do a service!
ron or jeff what ya think? sorry sparky they have answered a boat load of ? and they normally answer soon!
keep asking questions, i might have had a brain fart at some time!

as they havent answered yet , its seems it has stumped them to?!

 

Ron is in Australia...

And I'm just sick and tired hearing about your temperamental truck !

Seriously though, try switching out the injector on #2 with another and see if it moves the misfire to that cylinder.

I would start diligently checking the wires from the ECU to O2 sensors for good continuity _ hot and cold.
Move the connector and wires around when doing this.

Replace the "O" rings on the injectors or at least check them.

Is this the same truck that's still using coolant, what happened to that problem ?

 

lol yes jeff it is still the same temperamental truck that is still using coolant! nothing has changed with the coolant loss! i even put the thermostat back in (needed heat in the cold mornings,if ya call 20 degs cold!) im just trying to keep it running untill i get my 302 and aod tranny built!

like i said she purrs like a kitten first start up and fifty mile drive but when i come off the interstate she is missing! so tomorrow at work ill swap injectors around and see what happens. just got back from a 700 mile stint this weekend and it still happens even running 2 bottles of cleaner though it ( aka 2 tanks of gas).

and tomorrow morning is another 200 mile stint for work!

 

ok update time, i say to my self, self a reman injector is $20 just put a new one in an call it done, so i agree and get one. i finally get a chance to replace it in north Georgia ( i live in central Florida). next morning she fires right up like normal, drive 200 miles in wonder about my mileage! 22 mpg, cool she is fixed, not! come off the interstate and she is missing like crazy, still lean on bank 2 and misfire on #2 cyl! i have went through all the wiring and all looks good with new dielectric grease in all the connections, no corrosion found anywhere.

next guess anyone?

 

If you use too much dielectric grease, it can cause a bad connection _ it does not conduct electricity, it's meant to keep air out only.
With that said, I don't think that's the problem anyway.
Appears to do it after driving when engine is good and warmed up...

The thing is still using water and until that gets solved, I think the codes and problems will continue.

I thought you were planning a 302 swap any way ?

I wished you lived closer, I'd really like to see what's going on.

If this was an old fashioned carbureted engine, I'm pretty sure none of this would be happening.
All these bloody sensors and a computer that's too sophisticated for an ancient internal combustion engine.
If something is just slightly out of spec, you get codes and shitty running.
And in your case, it's like finding a needle in a hay stack.

 

lol jeff, that is what has me thinking a bad ecu. cold its fine and heat soaked it sucks! and a lil dab will do ya on dielectric grease!
yes a 302 is at the machine shop as we speak and my living room looks like ebay and summit puked parts on my floor! next is to get a aod trans and radiator and buy a beater vehicle to drive while the swap happens.

and yes that is why im going with a carb for now, to get away from this computer crap for now.

 

If you look at the ECU...
Look for burned circuits.
Cold soldering connections, they should be shiny.
Swollen capacitors.
Burned resistors and circuit chips.

I'm still going to maintain that the coolant loss is causing the misfire and lean code.
It only does it when it's hot.
The expanding metals opens a crack that can't be seen, possibly on the block.
And/or somehow it's affecting the head gasket seal.
Just theories.

 

the thing about it jeff is that it just started both codes at the same time! it went months without any codes and just the coolant lose! the o2 not reading on bank 2 is causing that bank to show lean. i know the sensor works, swapped it to bank one and it reads as it should. now im debating on $150 on a ecu for it! i still need it as a dd for now. i can handle $20 here and there but this close to yanking the engine for the 302 makes $150 a little hard to get my head around

 

If the coolant loss has not gotten any worse then, then it's probably not the cause.
It could be the ECU, but I've seen a number of guys here now replace theirs in desperation and it still hasn't fixed things.
Take the cover off and inspect it for what I mentioned.

What I would also do is take some time (yeah... I know, more time) and actually do some continuity tests from the O2 sensor up to the ECU while everything is plugged in and battery disconnected.
While the meter is plugged in, move the wires around.

Don't you have to deal with the PATS with another ECU, kind of a PITA ???

 

no pats in 95 thank god, just need a single digit off ecu and poof here comes ecu! ill look into it when i get home this weekend

 

ok another thousand mile of fighting my mystress on the road!

it went from miss fire on cyl 2 and lean on bank one

to misfire on cyl 2 and both banks lean.

fuel is out as pump reads correct at rail and filter was replaced a month ago.

just replaced maf and disconnected batt so computer can relearn

fuel trim is all over the place as well as o2 readings

one os11 reacts and looks normal but has fits

two sos21 is all over the place but then gets noemal and is the one that gose from no readings to max in a heart beat

three os22 performs normal with or with out maff

 

this truck will be exorcised of its demons when the lil 3.0 comes out in prep for the 306 (302 bored .30 over) being built by me as we speak!

 

ok yall dont have to worry no more! i blew up my mystress! spun bearings and busted rings! so she was a 95, i went and bought a 96, 4.0 4x4 every thing electric

 

ok yall dont have to answer any more questions about my mystress any more! i spun bearings going to pick up my new 96 green ranger! ten miles down the road ,the 96 fried the tranny! $1600 later with a rebuilt tranny al is well!

 

How in the hell did you spin the bearings, did you let it happen on purpose ?
Or you did it on purpose...

 

Have you considered the possibility that you may in fact be cursed?

 

rotf jeff! with the 95 yes not yet with the 96! but the 95 is getting the 306!

 

not sure about the bearings or bent push rods! but im sure that lil engine had over 300k on it when she went! she will still start and run just no power and knocks like hell!