scuba

ok so heres where im at
not long after my clutch job on my 91 22re it started misfiring
change plugs and wires
same misfiring
i think then it was giving me code 14 but the light wasnt on while driving
it would stutter
like ive read in other threads
so i decide to clean the tps male and female connector with no avail
while im in there i decide to change the pcv valve cause im burning wayyy to much oil.
Anyway i take in on a test drive, still the stuttering, and no CEL, BUT im getting codes 12, 14 and 41 when i get back home
as im typing i realized i didnt reset the cpu so i just did that.
i frequently go here to check random codes for random people on here and refer them to that site, http://autorepair.about.com/library/...bl-dtcs-71.htm


but i have the slightest clue where else to start

quick help, checklist, or any suggestions would be lovely

and i have searched

thanks guys

jwc1989

... tired mistake wrong post..

tc

http://personal.utulsa.edu/~nathan-b...sm/engine.html

scuba

ha
wow can you say thread jack
but seriously
thanks tc, im gonna look into that
btw, correct me if im wrong but doesnt pulling the efi fuse for a few minutes clear past codes ?

abecedarian

Pulling the EFI fuse should clear the codes....
Since you've cleared the codes, drive it a while until the problem returns and report back with the codes.

12 is "no Ne and G signal to ECU within 2 seconds after the engine is cranked"- probable causes: ignitor, distributor pick-up coil, ECU or wiring
14 is "no IGf signal between ignitor module and ECU for 6 events" (basically 3 crank revolutions)- probable causes: ignitor, ECU or wiring.
41 is "open or short circuit in throttle position sensor circuit"- possible causes: faulty or mis-adjusted TPS, ECU or wiring. troubleshooting info here: http://www.4crawler.com/4x4/CheapTricks/TPS/index.shtml

scuba

ok
well im trying to test the o2 sensor
cant find exactly where to test it
any body have pics ??
oh
i unplugged a little wire that goes from the top of the coil to the distributor while i was working
tried to fire up realized it wasnt on
so i got that back on fired up like normal
but still these codes, could 12 and 14 be because of that ?

tc

See link in post 3 ...

scuba

im there already man, im looking at the o2 sensor testing procedures, the picture is very vauge

scuba

correct me if im wrong but the o2 sensor is the one under the truck, right before the CAT converter.
tested at 2.5 ohms
im thinking i need a new one

tc

Yes, the O2 sensor sticks into the exhaust stream through the side of the exhaust pipe just in front of the cat.

Note: an O2 sensor has to be REALLY bad to throw a CEL. They can definitely affect drivability and mileage without lighting the check engine light.

scuba

well as soon as i get the chance im going to replace it cause it did test at 2.5 ohms.
havent gotten a chance to get in there tonight, im think im going to start with the ignitor and coil first
correct direction ??

abecedarian

You say that not long after a clutch job that the engine started to misfire. So given that I'd start looking for poor ground wires from the engine to the chassis and from the chassis to the battery.

After resetting the ECU by pulling the EFI fuse (or by disconnecting the battery) for a few minutes, are you still getting the trouble codes you mentioned earlier (codes 12, 14, 41)?

scuba

see heres the thing about the grounds which i was tlaking to my mechanic, the one that should be on the fender well, is now on the engine, and there was one that was just hanging long time ago, hooked it to intake manifold. fixed the stumbling,
so should i move the one thats used to be on the fender well back to the fender well ??
oh and yess, same codes..

abecedarian

Which-what-ever.... the engine needs to have a ground in some way, shape or form back to the battery, so it really doesn't matter which engine component does it, but the battery is grounded to the frame and the engine needs grounded as well... and the shortest ground is usually from the engine block, starter or alternator to the frame.

scuba

great in sight
but
do you think that swapping the ignitor and coil could be a start in the right direction ??

abecedarian

I spent 3 weeks trying to sort out a problem that implied a throttle position issue (got the CEL lit ONLY when I let off the throttle to shift) and it was fixed by changing the ignitor.

But I'd only chase those issues down now if I was getting the codes relating to them.

tc

In my case, the bad ignitor resulted in vapor lock symptoms. Personally, it sounds to me like you're running really rich (which is what happens when the O2 sensor degrades).

You KNOW the O2 sensor is bad, I would start there.

Do you have an ignitor/coil? They are quite spendy and kinda hard to find ...

scuba

ok, so i had some free time on my hands, cleared the ECU for real this time, i dont think last time pulling the efi fuse for a few mins did it. thus being said, took it for a ride, still got the stumbling, so, when i got back i only got code 14, i guess im starting to narrow it down. will update soon

scuba

well my ignition coil looks nothing like the first pic
http://personal.utulsa.edu/~nathan-b.../4onvehicl.pdf
on page ig-7

any helpful hints to start troubleshooting this bad boyy ??

scuba

bump

I need some constructive advice please !!??