I am about to give up

[Eastcoast SHO]

I have done everything possible that i can think of but I got codes again first is a 303 cylinder 3 misfire, i replaced coil pack and spark plug to no avail still a misfire, is it possible to get a bad coil pack even if it is brand new? should i buy another one and see what happens?

the other code is 171 system too lean(bank 1) to be honest I dont even know what this means,can anyone shed some light on this code?

can anybody seriously help out, other than that I will get rid of this car and buy another gen 2 if i cant figure this out, im tired of the same thing going wrong and my fustration is building

sorry for the rant i know all of you been there, and i dont feel so bad knowing that.:wave:

 

[jmpSHO]

0171 is most likely a bad oxygen sensor and if you already changed the number 3 coil and plug you might have a bad injector or maybe you bought a bad coil.

 

[Racer X]

If an O2 sensor is bad, it can make a bank run pig rich. Which, if it's rich enough, will cause a misfire. Which will throw the 2 codes you have.

Have you checked/ replaced your O2 sensors recently?

 

[Eastcoast SHO]

btw i forgot to mention i did change the fuel injectors also.... i havent changed the o2 sensors, to be honest i dont know how or where the front one is, noob in that area, never did one on these cars before

 

[jmpSHO]

Changing an oxygen sensor is very simple but you do need a special tool made for removing oxygen sensors. Depending on the angle you can use an adjustable wrench but it's a lot easier with the right tools. I'm not 100% sure but I believe Bank 1 Sensor 1 is located between the fire wall and back of the motor right above the cat. I haven't worked on a Gen 3 in a while and I believe it's easier to get to from the bottom.

 

[Eastcoast SHO]

thanks bro i will have to make another weekend out of it this sucks, maybe i will pick up another coil pack and replace both sensors and see what happens i guess

i just wish i could get a solid answer and have this fixed

 

[jmpSHO]

If it was me I would definately exchange that coil for another. I just went through 3 IAC vavles on my truck before I got one from a parts store that worked. Just because it's new doesn't mean it works like it should. Does the car run ok or does it run a little rough all the time?

 

[Eastcoast SHO]

it runs a little rough all the time

 

[jmpSHO]

You might want to do a compression test on your motor. Low compression in that cylinder will cause a misfire.

 

[Bob Gervais]

Bank 1 too lean. #3 cylinder is also on bank 1. I'd be looking for vacuum leaks at this point.

To save yourself some money, and to stop throwing parts at something until it's fixed, swap the O2's from the rear to the front. If you get a code for the front bank running too lean, it's a safe bet that the O2s are junk.

And yep, do a compression check. Can't hurt.

 

[Eastcoast SHO]

i have no idea how to do a compression test, and if lets say it is no good what does that mean? is the engine no good? or costly in fixing?

i dont even know where all the vaccum lines are so looking for them would be trouble for me.

does anyone know how to do a compression test or maybe help this weekend on that, like i said i am at my wits end, overall already dropped $5000 into this car in the last 6 months and it seems like nothing is getting done

i should also say; the cars drives fine when driving, when at a stop or redlight it jumps like it wants to stall ,about 2% of the time it will stall coming to a stop not always, sometimes at an idle it will run perfect, then others like a cylinder drops out, i am trying to be a specific as possible, sometimes it drives like it should other times it runs like absolute shit, maybe this will help someone out with figuring out what is wrong with it

i had the p0303 code awhile ago, then mysteriously it disappeared for 3 weeks then yesterday it reappeared a day after doing the spark plugs

 

[tardboy21]

Don't let your SHO get the best of you, you have to be the strong one in the relationship.

If I were you, replace the O2 sensors ($50 for one, but $100 for both will keep this from happening on the rear bank). See if that fixes it.
IFF its still giving you the codes, swap the new coil on #3 with #5 or #7. See if the code then switches to that cylinder. If it does return the coil pack.

BTW, compression testing isn't too hard. But I would replace the O2's first.

 

[1995mtxsho]

I would also inspect and rewrap the coil harness on the back bank.
The wires are prone to alot of heat and when I did mine several of the wires were stuck together. I reinsulated each of the positive wires and reloomed rewrapped the whole harness. I also used a heat shield tape over the looming to help insulate it further. It is alot of careful work but it is worth it as preventitive maintinence.

 

[Eastcoast SHO]

i wonder if this will help anyone out, here are the old spark plugs that i pulled out, they all look quite the same,only cylinder 4 spark plug had a vey small amount of oil around the spark plug threads

 

[1bad98SHO]

I would also inspect and rewrap the coil harness on the back bank.
The wires are prone to alot of heat and when I did mine several of the wires were stuck together. I reinsulated each of the positive wires and reloomed rewrapped the whole harness. I also used a heat shield tape over the looming to help insulate it further. It is alot of careful work but it is worth it as preventitive maintinence.

+1. You need to inspect that wiring harness really close. It gets very hot back there.

 

[Eastcoast SHO]

I would also inspect and rewrap the coil harness on the back bank.
The wires are prone to alot of heat and when I did mine several of the wires were stuck together. I reinsulated each of the positive wires and reloomed rewrapped the whole harness. I also used a heat shield tape over the looming to help insulate it further. It is alot of careful work but it is worth it as preventitive maintinence.

I will look into that....just one question what exactly should i do? what am i looking for? pictures of what i have to fix would be super cool

 

[venom]

I will look into that....just one question what exactly should i do? what am i looking for? pictures of what i have to fix would be super cool

Injector??? A bad injector or wiring to it in cylinder 3 would explain everything too...

 

[Eastcoast SHO]

ok maybe it is not as bad as i thought, i must recant what i stated, i ran the codes today and realized it was p0302 not p0303, so before it was cylinder 3 misfiring, but now its cylinder 2 misfiring, not 3 anymore huh? so maybe the coil pack was not properly pushed down, or it is the oxygen sensor causing the misfire? since it is actually not the same cylinder anymore?

 

[Bob Gervais]

How many new coils on the rear bank? Just #3 or all of them?

Don't worry about the O2 code until you get the misfire fixed.

 

[Eastcoast SHO]

all 4 are new