[breakfastreatre]

Hi guys,

purchased a 135 as a second car/track toy.

catless downpipes, ams intercooler, active autowerks bov.

I got it cheap knowing that i would be spending some money on something soon.

Test driving the car with the jb4, it felt great and I had no issues. Full throttle multiple times and no hiccups. Only issue with the car running was a rough idle at times, presumably from carbon buildup as a blasting hadnt been done recently.

Now that I have the car in my possession, problems show up.

driving around normally, the car exhibited zero issues.

but, WOT would occassionaly put it into some sort of limp mode. The car was missing really bad, and it sounded like a boxer engine. Turning the car off and then back on would bring things back to normal

I had a generic code reader at the time and got the code:
p0365 cam position sensor B circuit bank 1

The car was still not stickered at this point and I needed an etest, so I threw in a JB fix into the jb4 wiring. Car still exhibited no issues driving around normally.

Passed etest.

drove the car for about a week with the DP fix in. Maybe put 300kms on it in that timspan.

Talking to some friends, they mentioned the vanos solenoids could be an issue. They are an easy fix, so I purchased two new ones, and threw them in.

I also removed the DP fix at this point.

reset the ecu, removed the negative, held brake pedal for 30 sec.

This is when things starting getting worse.



Between 2000-3000 rpm, partial throttle, the car would surge really bad. RPMs not building smoothly.
anything more than partial throttle up to WOT would be smooth but WOT conditions would produce the misfire/limp/boxer engine sound more frequently.

I removed the JB4 and replaced it with a mhd flash.

Now, im getting misfire codes in cylinders 1, 3, 4 as of most recently.

what should my plan of attack be?

Is this something I can diagnose with the monitoring package through mhd before I start pulling parts?

Plugs were replaced recently but maybe are already fowled? replace
coils are an unknown. replace
pull plugs, check for fuel, possibly leaking injector?

if that has no effect, change upstream O2 sensors.

then, injectors, hpfp


anything Im missing? Should I try anything else before swapping parts?