2021 Kia telluride

Hello all, I’m having a troubled intermittent problem on a telluride, it’s coming back this weekend for more digging into and hopefully figuring it out.   
the problem started roughly 5 months ago with a cyl 1 misfire (easy peasy) found the plug with a crack ,  changed plug and coil got that cylinder no problems till a month ago. Customer said it had a fish bite misfire occasionally customer came back with TRQ coils and TRQ plugs I think possibly from parts geek or another online shop, I installed those with hesitation and pause and told them it’s usually best to go oem with ignition parts and warned they might not last very long, and I turned out correct random misfires on cylinders both banks within a week, customer came back with oem coils and plugs stuck those in misfires stopped until yesterday, luckily he’s fairly knowledgeable and his own scanner and i directed him to send me pics of short and long trims , along with with any misfires if any. Also asked him to send be any info on generic scan data,   Here’s where the issue might be bank 1 is roughly 6 -10 on trim and about 20 on bank 2. Also no misfires recorded or any codes But eobd he does have a fault of OL fault B2. I’m thinking vacuum leak I plan on doing a smoke test when get it.  And physical fuel pressure test on low side he says the scanner he has is showing in spec and what he showed me seems correct.  Just curious if anyone else has had an issue like this ? This is the first telluride I’ve seen and imagine they’ll be a little more popular now the warranties are going dead.  Thanks. 

It could be just about anything at this point, let us know when you get your hands on it and feel it out for yourself. Sometimes the customer doesn't do a great job of explaining the symptoms.
If he brought his own parts, I would question the source. I have see some questionable "OEM" ignition components from the Internet that are wildly different from OEM parts from the dealership.

Well I’m afraid I may have some answers, I noticed some mice damage chewing on the sound proofing stuff around the coolant reservoir, I’m gonna do a smoke test just to make myself feel better however I think I may find some chewed wiring, just so happens the o2 sensor wiring is on the same side.

Scope and meter will be in use 😂

Well smoke test perfect. The scan tool info was 6 adding percent correction B1 and 12 + on b2. I’m pretty much to the point that the lambda sensors are lying or one of the injectors are under performing. Last case the pcm If anyone has input I will test it. Thanks! Keep in mind this was with an autel 909 and a top don they seem to interpret the information pretty close

To be clear, your customer's concern is the feeling of a misfire, correct? Did they say if it happens at idle, during cruise, heavy acceleration? Have you been able to reproduce the symptoms?

Mode $06 would be helpful in this case. Even if you're not getting a misfire fault code, it'll still track history misfire counts. Often better than the OEM data will.

The scan tool info was 6 adding percent correction B1 and 12 + on b2.

I don't think that's too bad, really. 12% is a little high, sure, but not enough to cause a fishbite miss. I'd be inclined to treat the trims and the fishbite miss as two separate issues for now. If you narrow your miss concern to bank two, then you might be onto something.

But eobd he does have a fault of OL fault B2

Did the PIDs you were looking at say 'Fuel System A Status' and 'Fuel System B Status'? With 'B' being OL Fault B2? That's (unfortunately) normal.

The whole 'Fuel System A/B Status' thing isn't for two different banks, it's there if the vehicle literally has two fuel systems. Direct and port injection, for example. Topdon likes to show OL Fault B2 on the 'Fuel System B Status' when there is no system 'B'. It's definitely misleading.

Yes I have seen the misfire in eobd data it showed 1 misfire , I took it out today , and it only does it around 2000 rpm at around 45-50 after letting off accelerator and when you tip it back in it does it. I might be inclined to think tcc problem too.
Thanks

sadams4431 wrote:

Yes I have seen the misfire in eobd data it showed 1 misfire , I took it out today , and it only does it around 2000 rpm at around 45-50 after letting off accelerator and when you tip it back in it does it.

Gotcha. I'm inclined to think you still have an ignition concern. You could move the #1 coil to one cylinder, and the plug to another. Drive it again and watch Mode $06.

I might be inclined to think tcc problem too.

You're thinking a TCC problem may be causing the miss counts? Or that there's a miss problem AND a TCC problem?

im sorry i should have been more specific, i can make the car feel like a miss anytime i want during the conditions i mentioned, however it will show a misfire 1 out 40 times on either scanner i use, sometimes not at all. i was trying to correct the what i thought was a lean condition and then move to the possible misfire problem, I thought there could be a possible tcc issue as well that sometimes can feel like a misfire ,but this doesnt feel like a normal tcc issue. it doesnt shutter and the trans shifts perfectly fine.

also i forgot to mention it never sets a code, i only see misfire info on generic obd, and its usually 1 over a period of several drive cycles.