[finncoffee]

My engine seems to be running fine, but the check engine light is on. I used my code reader and I get P0300(random multiple cylinder misfire) & P1316(misfire causing excessive emissions). I've just added seafoam gas additive. Any Ideas??? The funny thing is that this did not happen until I had the RR smogged, and it passed!!!!

Thanks VERY much for any help,
Kurt

 

[Mr Tj]

Could be an O2 sensor or 2 on the blink. If you have the dough, I'd take it in to a dealer to have them run their Testbook performance tests against the sensors (ramp-up / ramp-down times, etc). Beware that replacing these is a lot cheaper done outside the dealer network.

Good luck!

---
Staffan Tj
'96 RR 4.6 HSE
Rioja Red / Walnut
115k