E85 code deciphering
- Thread starter Dr. Zed
- Start date
x-driver said:
Done all the above, and still have the same codes.
It's really confusing me. So unless it needs a good run because I only took it for 20 mins as I didn't wana run it too much given the misfire error. In my opinion it's not misfirig but I don't want to wreck the engine if it is indeed misfiring.
x-driver said:
I've never replaced the plugs so who knows how old they are..
I really can't imagine it'd be CCV or anything because I'd imagine a sensor for that would throw a code.
Bad fuel might be a shout because it hasn't be driven in 3 months but the check engine light did come on before that 3 month time period. And 3 months really isn't that long for fuel.
And again, I'd expect the car to be struggling under load for most of those things, no?
Then I recommend you replace the plugs asap 
CCV won't throw a code. When it's bad, you might notice increased oil consumption, misfire might happen, some test for CCV is to open the oil cap when engine running. If you notice heavy vacuum when removing the cap, it is believed the CCV is bad.
Not every fault will show under engine load. Some will show when idling or driving moderatly (~2.000 rpm).
CCV won't throw a code. When it's bad, you might notice increased oil consumption, misfire might happen, some test for CCV is to open the oil cap when engine running. If you notice heavy vacuum when removing the cap, it is believed the CCV is bad.
Not every fault will show under engine load. Some will show when idling or driving moderatly (~2.000 rpm).
x-driver said:Then I recommend you replace the plugs asap
CCV won't throw a code. When it's bad, you might notice increased oil consumption, misfire might happen, some test for CCV is to open the oil cap when engine running. If you notice heavy vacuum when removing the cap, it is believed the CCV is bad.
Not every fault will show under engine load. Some will show when idling or driving moderatly (~2.000 rpm).
I'll give it a go mate, thanks!
x-driver said:Great!what turned out to be the problem?
Mechanic asked me what the issue was and I explained the EML came on last year and has been since. Told him I'd replaced a section of split piping and both pre-cat sensors. Still nada. He rang me an hour later to say it was all sorted. There was a tiny split in another line that I missed but this wasn't the root cause. He wasn't 100% sure what exactly caused it.
He reckons it was a low voltage at some stage and it wrecked havoc with the ECU. Why this manifested itself as a random engine light on a random day last year and why it was then a persistent engine light for months he wasn't sure.
He also wasn't sure if the O2 sensors actually needed to be replaced but I'd done them the day before I dropped it in.
He cleared all the codes with some fancy reader and all done. He did a health check and smoke test too and said the engine was in perfect health.
So yeah, all done!
enuff_zed said:
More than likely but because it wouldn't have dawned on me to ask I likely wouldn't have reached that conclusion.
My scanner was giving me codes. I think if I wasn't getting any codes but knew there was an issue then ironically I'd have asked and maybe sorted it sooner as you said!
