Wife took the Trooper on a road-trip across 2 states. I instructed her on checking the oil at every stop because it consumes quite a bit. One stop, the teenager checked and he opened the oil cap instead of pulling the dipstick and left the oil cap OFF the engine. Wife drives awhile and notices an odd smell, pulls over, and pops the hood. Oil is obviously EVERYWHERE. She cleaned up as much as she could at a gas station, checked the oil, topped it off, and continued on the trip. A few hundred miles later the oil pressure light comes on and the gauge shows less than zero pressure (gauge fully to the left beyond zero). She continues driving while looking for a gas station to stop at and the engine dies and won't fire back up. No odd knocking noises so I'm not sure if there is a spun bearing or other issues but I'm getting codes P1312 and P0300. Help????
Could the massive amount of oil coating all the electronics on the passenger side of the engine bay be causing this issue?
P0300 is a multiple cylinder misfire and P1312 is an Ion Sensing Ignition System code that is indicating poor combustion in the LH (Driver) cylinder bank. The misfire detector in built into the Ion Sensing Ignition module. If the engine won't startup these codes must have be stored before the engine quit running. The Ignition System electronic module is mounted to the top of the intake manifold, maybe the hot oil damaged the module. Recommend checking to determine if there is any spark at one or more spark plugs in each cylinder bank as the engine is cranked.
If you want to try a junk yard replacement Ion Sensing Ignition module, a module from a 00-02 Trooper, a V6 00-04 Rodeo, 00-02 Passport, V6 01-03 Rodeo Sport/ V6 00 Amigo will work with your truck.
A rag caught between the timing belt and the camshaft timing belt pulley likely caused the LH (Driver Side) cylinder bank to get out of time and is the reason the engine won't start. It takes about 4 hours to replace the timing belt, the biggest hurtle is removal of the crankshaft serpentine belt pulley so you can remove the middle plastic timing belt cover. The other two covers are also have to be removed and not so easy to remove either.
A rag caught between the timing belt and the camshaft timing belt pulley likely caused the LH (Driver Side) cylinder bank to get out of time and is the reason the engine won't start.
The rag was used as a makeshift oil cap and was sucked into the rotating camshaft internally. Going to be fun tearing the top end down and finding all the little bits of rag. Thanks for the info.
If the rag got pulled down into the valve train gearing and got chewed into bits that plugged up the oil pump you now likely have a 500 pound 3.5L boat anchor.
Running the engine with no oil pressure can damage a lot of expensive stuff. You can have the engine rebuilt if you have several thousand bucks to spend.
On the upside, you stated the engine burned a lot of oil but that can be resolved by installing the new pistons that have the extra holes in the oil ring groove. The 98-02 Trooper 3.5L engine is basically a stroked 98-04 Rodeo 3.2L engine. They share the same block, heads, and connecting rods, so you can use a Rodeo engine for some parts if necessary to keep the rebuild cost down. You can also drop in a complete Rodeo 3.2L engine and be on the road with a slight drop in power.
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