Recently I bought a Mitsubishi Montero Sport for 900 bucks with 144k on it. According to the lady it worked perfect for the year she had it, then started losing engine power. Obvious symptoms were a wobbly crank pulley, unburnt fuel smell, idle surging, and just sounded a little off. Codes I pulled were for multiple misfires, O2 sensor circuit/heater circuit bank, as well as EGR A flow insufficient.
I got the crank pulley off, then noticed that the timing sprocket behind it had a roll pin sheered off, its supposed to go into the back of the crank pulley. I'm going to replace the timing belt, as well as that sprocket, and hopefully that'll solve the issues. My current guess is since that pin sheered off the timing was able to drift a little bit, but I'm not experienced with working on cars so I don't know.
Any insight would be extremely helpful!
One thing I'm aware of is that the engine is an interference engine, so I'm worried about any damage to the valves/piston, but I figure since I didn't hear any pinging and it ran alright, that it should be fine.
Yes, pray that it was just the pin that broke that does happen and that will only affect electronic. I mean not the mechanical, the mechanical part is behind there on the gear. Pray it's that and not a worn out. Crankshaft because if the crib shafts worn that will wobble around and break it. Good luck
@scottykilmer Thanks for the response Scotty, I just recently got all the parts I need to do the job, and I've got another question. The old harmonic balancer seems to be fairly new, so I was wondering if it's possible that the used car dealer replaced it thinking that was the issue, but maybe it was just the torque that kept the sprocket from moving around, and causing the symptoms. Separately, if the harmonic balancer wasn't worn, why did it wobble a year after purchase, did they torque it wrong? Cause it took a decent amount of force to get off. I'm just really confused as to how all the symptoms line up, and what caused the issues in the first place.
Maybe I'm over-complicating it and it's as simple as the bolt wasn't torqued properly, backed out, damaged the sprocket, and caused the issues. But that doesn't seem right to me.
Just let me know your thoughts, thanks again!
@jrwilson207 Scotty does not generally return to topics he has already answered.
If a used car dealer installed the harmonic balancer you can bet your sweet bippy that they used the cheapest, lowest-quality part possible, and probably botched the installation as well.