I recently purchased a 1996 Q45 with 130k on the odometer. I've owned a Y33 previously but really appreciate the earlier style so when I found one for a decent price that seemed to operate well I jumped at it. 100 miles later and we are inoperable.
Some of the known issues that I am currently working through are leaking valve cover gaskets (have done this job on the Y33), and the following codes:
Initial codes: P0136, P0400, P1400 - car ran and drove the 100 miles seemingly okay with all of the prior codes. I didn't have a chance to trouble shoot/test EGR system or o2 sensors while car would idle since most of that was just driving the car home. That and I wasn't anticipating it dying shortly after.
A short drive the next day to continue to identify issues left me needing a tow home after the car died while idling - I was able to pull the following codes after:
P0300, P0340.
Symptoms now are it is happy to start within a couple cranks however stutters, then shortly dies after.
My thoughts are to tackle the CPS P0340 code first as it seems unlikely that multiple coils would go bad to the point of misfire at the exact same time after driving with no symptoms this long, as well as the previous owner not having any symptoms (or not disclosing them, ha. He seemed genuine enough though).
Previous threads point to it being possible that enough oil has leaked that it is interfering with the CPS receiving the signals it needs to transmit to ECU. I have checked the CPS harness connector for voltage and confirmed terminal 2 is receiving battery voltage with ignition on.
Happy to take any suggestions on how you would go about resurrecting this G50. It is a relatively clean body and would like to see this thing back on the road to be enjoyed by the masses.
