99 Taco misfiring
My 99 Taco w/275k miles is giving me some trouble. While driving, it will feel normal, then suddenly enters into a mode where you can feel it shimming side-to-side a bit more than expected, kinda hear the exhaust "putt-putt-putt" instead of normal purr, and when I give it some gas, the engine stutters and the power just isn't there, and check engine light flashes and then goes away. Kinda reminds me of how it behaves with a bad plug. Sometimes when I start it, it's in this mode, and sometimes it only falls into it after twenty or thirty minutes of normal driving; once entered, it seems to stay in this mode across multiple off/on.
The first time this happened, it was throwing a P0306 Cylinder 6 misfire detected, another code to do with the Idle Air Temperature Control, and several times flashed a code about air fuel mixture too lean (my code reader seems to have deleted the actual codes). So we discovered the air filter box had a crack in it past the filter, which we repaired, and hit the MAF sensor with MAF cleaner, because it was fairly dirty.. Still behaved the same, and threw the same codes. Plug 6 looked fine, so we replaced the coil pack for 3&6. Still behaved the same, and threw the same codes. So I took it to a shop, they saw 0306, claim it had compression within spec, and replaced plug 6. It's still behaving the same, and I no longer have access to a code reader but I did see Check Engine flash a few times the other day.
Here's one stupid thing I did leading up to this: I ended up in a bit of a bind, and ended up having to tow a boat that was around 6800 pounds for about 50 miles, which is way over the 5000 pound safe tow limit. I'm hoping I didn't do anything more insidious like broken piston rod or blown head gasket... I do not see any vapor or colorful smoke coming out of the exhaust. I'm hopeful it's just a bad fuel injector or something.
Any ideas appreciated. This is above my pay grade, so I'm taking it back to the same shop that replaced the plug, telling them "it aint fixed", and hoping they come up with a better diagnostic based on recent check engine light flashing. It would be nice to get some insight from you guys in the interim. Thank you!!
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- OME Dakar + NitroCharger Sport in rear
- BFG AT 33x10.5 15's on stock wheels
- PPI 4100 driving 12" Kicker solobaric and MB Quart 216 separates
- Just enough rust to seize up every last damned bolt on the undercarriage, but not quite enough to qualify for the rust recall