Ive got a 3.1 with a misfire in cylinder 5. Ive had the plugs and wires
changed, ive swithed the coils around to try to get the misfire in a
different cylinder but its still in number 5. I just changed the injector
and put in a new one. The check engine light still comes on and it still
blinks when i accelerate. when i check the code with an OBDII, it has two
codes both saying cyl 5 misfire detected! I have no idea what it could be,
unless there is coolant getting in my cylinder? Any ideas????

Is the injector getting the electrical pulse? Maybe there is a problem with
the wiring. It needs to be checked at the injector and also at the
computer.


"J-Dawg" <justin_thompson5 (AT) hotmail (DOT) com> wrote

Well, if it isn't the coil. It could be the injector harness, or even the
ignition control module.. OR you could take it to a shop and see if they
can't fine the problem.

"J-Dawg" <justin_thompson5 (AT) hotmail (DOT) com> wrote




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"J-Dawg" <justin_thompson5 (AT) hotmail (DOT) com> wrote

signal. This doesn't check the timing of the pulse, but I would only check
that if you rules out anything else.
Since you changed the plugs and wires, that part is probably ok too.
The next step is checking for a problem with your valves or piston in cyl 5.
The easiest is a compression test, if that indicates the problem I would
check for carbon build up (This would be fairly sure bet if it wasn't for
the fact that you only have problem on 1 cyl and quite a few of them).

Don't wait to long because it might ruin your catalic converter and
depending on the state you live in that might be a big problem.

"J-Dawg" <justin_thompson5 (AT) hotmail (DOT) com> wrote

I have a 98 Montana w/3.4L engine w/104K miles. Around 95K miles the engine
started running very rough and the SES light came on. I've got a unit to
record engine parameters and read the code using a laptop. The code
indicated a misfire in cyl. #5. The plugs had less than 15K miles, the plug
wires were Taylor however that didn't mean that they were good. So I switch
the plug & wires from #5 to another cyl. and the problem remained. I also,
like you, switched the coil pack although if it were bad I'd think 2 cyls.
would misfire. In any case nothing I did changed the fact that #5 misfired.
The last thing I did was switch the injector from #5 to a cyl. in the front
bank............ and lo and behold the problem cleared up......... for about
a week! Then another cyl. misfired but not the one with the original #5
injector.
In the end I ended up replacing all the injectors with a set of
reconditioned ones for about $150 and the problem has not come back. Have
you tried running some injector cleaner such as Chevron Techron?