At 80000 miles my pontiac misfires-probably needs new wires and plugs-can reach the ones up front but how do you reach the three in back? I can't even see them let alone change them. Do you need to dissamble parts nearby to improve access? Do you use a mirror and light to see what you are doing? Thanks
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First you need to determine what type of miss you have. Is it random on all cylinders, or is it restricted to one or two cylinders? Random misfire can be caused by crank or cam sensors that are starting to give out. Single cylinder misfires can be due to plugs, wires, coils (you already addressed those), as well as internal issues such as burnt or broken valves.
bad need of a tuneup? like new spark plugs, ?
172 , is 02 rich/ lean warning. this one is low oxy for rich.
this code can just be a victim. for sure , with misfire.
means 02 sensor stuck at rich,
what is water temp in engine coolant, at failure? less than 150F?
could be lots of things.
leaking injectors, bad fuel.
injector sticking> causing misfire.
id use a scan tool and watch all sensor when it fails.
too high fuel pressure.
misfires cold, but only luke warm cold starts not fully cold.
just one DTC, no P0300 or 30x misfire codes, not even P0300 pendings?
Its either an intake or exhuast lobe that is worn down on the camshaft or a bent pushrod or a worn lifter.I would first check the rocker arms for looseness then check the pushrods for that cylinder to see if one of them are bent.It may only need the valves adjusted.
Here is a diagram of the firing order for you 3800 engine. Cylinders 1 and 4 are misfiring because the operate under the same "Coil Pack" and the coil pack has unfortunately gone bad. O'Reilly sells them for between $30-50 depending on the amount of warranty coverage you want. To replace, simply unscrew the screws that hold the coil pack in place. WAIT before unplugging the plug wires. Place the old coil pack and new coil pack next to each other, unplug one plug wire, then plug it to that same port on the new coil pack. then do the same for the other plug wire. Then screw your new coil pack in place, and start you car. should run fine!
Solution is in the wiring harness....these cars are noted for this as it runs under the rad exposing it to the elements and corrosion. You will need a dealer with the proper scanner to read the code & find the wire.
P0300 is a random misfire code, if you are not mechanically inclined the first thing i would do if you havent done so in the past year or more, is change the plugs and wires, a random misfire code can be caused by worn plugs and/or wires not firing properly. let me know if that fixes it.