Very rough idle and black smoke - Corsa Sport - for Vauxhall and Opel Corsa B, Corsa C and Corsa D

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pippin

Member

Registered: 27th Jan 09
Location: inverness-scotland
User status: Offline

7th Apr 11 at 13:34

as i mentioned in a previous post my car started rough idling ,and i got 2 codes up
P1120 throttle control valve(broken tube)
P0170 fuel trim malfunction bank 1
now today i replaced the throttle position sensor ,and lambda ,and cleaned the plugs cuase as they were sooted to fuck ,but the car is still idling very rough and black smoke. now i know this is because off over fueling i also did a compression test and all cylinders were around 150psi.
i forgot to say its a corsa sport x16xe ,with a powerbox fitted i checked vacumm pipes there all ok ,iv replaced crank sensor,lambda,throttle position ,coolant temp,map,and im going to fit a idle control valve tomorrow.
so why is it over fueling so bad!! ???
fuel pressure regulator ??
injectors??
air temp sensor??
or somthing else??

Help please as i need my car and mpg isnt the best right now .

[Edited on 10-04-2011 by Ian]

B3KAN

Member

Registered: 15th Feb 07
Location: Inverness, Highland
User status: Offline

7th Apr 11 at 13:42

Your meant to be a mechanic

pippin

Member

Registered: 27th Jan 09
Location: inverness-scotland
User status: Offline

7th Apr 11 at 13:43

ano but im at my wits end keith iv tryed pritty much everything

Eddx14xe

Member

Registered: 12th Jan 10
Location: Hertfordshire
User status: Offline

7th Apr 11 at 13:53

Have you tried egr valve? Mine was over fueling and had rough idle, blanking egr valve sorted it out

pippin

Member

Registered: 27th Jan 09
Location: inverness-scotland
User status: Offline

7th Apr 11 at 14:01

egr is blanked mate did it when i did the powerbox

ryanlockie

Member

Registered: 25th May 10
User status: Offline

7th Apr 11 at 14:33

Have you tried resetting the ECU?

pippin

Member

Registered: 27th Jan 09
Location: inverness-scotland
User status: Offline

7th Apr 11 at 15:24

nope not yet ,whats best way to go about that

pippin

Member

Registered: 27th Jan 09
Location: inverness-scotland
User status: Offline

7th Apr 11 at 15:26

diconnect the battery??

ryanlockie

Member

Registered: 25th May 10
User status: Offline

7th Apr 11 at 15:31

Yeah negative and leave for an hour then reconnect and dont rev it for 5 mins

Dave_Sport

Member

Registered: 15th Jan 11
Location: BOURNEMOUTH
User status: Offline

9th Apr 11 at 23:44

scan it again and clear the codes, then disconnect the battery, I had a similar problem on mine and changed loads of bits just like you in the end i took the throttle body off and gave it a good clean and took the idle air control valve out and soaked it in brake cleaner for half hour, dried it off and re-fitted it and it was sorted straight away, ran like a dream

Dave

Jake

Member

Registered: 24th Jan 05
User status: Offline

10th Apr 11 at 08:25

fucked cts will make it over fuel

jonnyboyy

Member

Registered: 25th Apr 10
Location: Leyland, Lancashire
User status: Offline

10th Apr 11 at 16:43

i had a similar problem, swapped the fuel rain and injectors. ran mint ever since.

AlexW

Member

Registered: 25th Oct 08
Location: Essex
User status: Offline

10th Apr 11 at 22:44

If you have changed CTS for a GM item, Rule that out. I would agree with funked FPR, Prob stuck and holding more pressure.

I doubt its the injectors.

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