p01030 '99 Vectra

[GolfmkI]

reset throttle, changed fuel pressure reg, changed plugs, runs a hell of a lot better till the eml comes on, p01030 (4) o2 sensor voltage high - present, have checked wiring to it, and the sensor is a brand new NTK one, in the measuring blocks it's staying open loop and between 3,600 -3,900 mv.

99% ecu is defective.

[estate]

right latest development is.............. the full new exhaust system is on now, and it only miss fires and give an EML when cold, then seems to warm up and runs fine. The car was parked up for 5 months due to running issues, so i'm thinking now, possible sticking valve? would this cause the probs i'm getting?

[dafdiagnos]

a sticking valve would really stick at any temp & would usually cause the vehicle to smoke quite heavily & sound very rough. it would poissibly be more noticeable on tickover but could clear at higher revs. only real way to tell is to peer in top of engine while turning over by hand on pulley

[givusaclue]

christ
there's some sever guesswork/sustitution diagnostics gone on here, it costs about ?60 to get your ecu tested with a 3 day turnaround
wouldn't want your bill!!

[Meat-Head]

christ
there's some sever guesswork/sustitution diagnostics gone on here, it costs about ?60 to get your ecu tested with a 3 day turnaround
wouldn't want your bill!!

can just see it now

CUSTOMER: How much, why all these parts
ESTATE: err, umm but well we needed to elinate the other things
to err <FLAPS ARMS>
CUSTOMER: You can take the effing exhaust off, and the effing air freshner, not paying for that

ESTATE: Bbbut, eer urrm ahh, they are err non returnable
CUSTOMER: You will be wearning them soon

[estate]

!, the only new bits have been lambda and cat, ?120 for both, cat was knackered though, and seeing as the car was a total non runner and now only has a slight miss when cold, and drives fine apart from that, and the car was free, it's not such a bad result, i would of spent more time on it but was easier to swap and replace, being having major work done on the house this week.