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Author C20XE Overfueling
Olsrey
Member

Registered: 13th Jan 07
Location: Bradford   Drives: LET Vectra B
User status: Offline
19th Dec 07 at 12:58   View User's Profile U2U Member Reply With Quote

Recently done the conversion and the engine is massively overfueling. I never got a fuel octane plug with the engine so could it be that?
Superlite Ltd.
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Registered: 9th Jan 07
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19th Dec 07 at 14:55   View User's Profile U2U Member Reply With Quote

yes
Olsrey
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Registered: 13th Jan 07
Location: Bradford   Drives: LET Vectra B
User status: Offline
19th Dec 07 at 16:44   View User's Profile U2U Member Reply With Quote

Went to the scrappy today and the C25XE had been crushed so I got a selection of other fuel octane plugs. The one that seems to work best is a White 98 plug. Also replaced the lamba and it seems better. But its still overfueling a bit.
luke85
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Registered: 26th Nov 07
Location: Chesterfield
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19th Dec 07 at 18:56   View User's Profile U2U Member Reply With Quote

Have you had it on a wideband to prove its overfuelling? The coolant temperature sensor is normally the cause if it is actually running rich
Olsrey
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Registered: 13th Jan 07
Location: Bradford   Drives: LET Vectra B
User status: Offline
19th Dec 07 at 19:06   View User's Profile U2U Member Reply With Quote

I don't need no fancy guage to tell me that the car is using WAY too much fuel . You can smell it and the way the engine behaves is enough.
DAZ1985
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Registered: 3rd Sep 06
Location: Scholar Green, Cheshire
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19th Dec 07 at 19:20   View User's Profile U2U Member Reply With Quote

Luke is right in what he says though
carnuts
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Registered: 28th Aug 05
Location: Hertfordshire
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19th Dec 07 at 19:28   View User's Profile U2U Member Reply With Quote

i had this before was a weak spark from a lead broken down inside it done what you are saying stunk of fuel and just didnt run right but ran ok ish

wasnt an xe though

[Edited on 19-12-2007 by carnuts]
Olsrey
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Registered: 13th Jan 07
Location: Bradford   Drives: LET Vectra B
User status: Offline
19th Dec 07 at 19:31   View User's Profile U2U Member Reply With Quote

Its the exhuast fumes that stink of fuel, and its fine once you give it some but its just when idleing and trying to go slow. Going around asda carpark is impossible as it just judders to fuck and me look like a twat
carnuts
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Registered: 28th Aug 05
Location: Hertfordshire
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19th Dec 07 at 19:33   View User's Profile U2U Member Reply With Quote

yeah mine stunk from the exhaust too mate cause it wasnt getting burnt properly so it was spitting it out
Olsrey
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Registered: 13th Jan 07
Location: Bradford   Drives: LET Vectra B
User status: Offline
19th Dec 07 at 19:34   View User's Profile U2U Member Reply With Quote

I've also used some other leads which I know to be good and it still does the same.
Richie
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Registered: 3rd Dec 02
Location: Newport, Wales
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19th Dec 07 at 19:47   View User's Profile U2U Member Reply With Quote

Would normally be the coolant temp sensor or the AFM. Do you have an engine management light on?
Olsrey
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Registered: 13th Jan 07
Location: Bradford   Drives: LET Vectra B
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19th Dec 07 at 19:49   View User's Profile U2U Member Reply With Quote

Yes but thats another fault with the car as the EML flickers and my fault code reader just displays "ERROR!" when ever I try to connect to the ecu.
luke85
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Registered: 26th Nov 07
Location: Chesterfield
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19th Dec 07 at 22:45   View User's Profile U2U Member Reply With Quote

Just because it smells of fuel and makes poor MPG doesnt mean its overfuelling. I think i saw your other thread about the flickering EM light.

The ECU light wiring is dead simple, theres +12V on one side of the bulb when the ignition is on and the other side goes to a brown wire with a blue stripe down to the drivers footwell. This wire just needs to be connected to earth to make the light come on.

The brown wire with blue stripe matches up to the same colour wire coming from the LET or XE ECU. Check its connected right and the insulation isnt broken and its touching earth
Olsrey
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Registered: 13th Jan 07
Location: Bradford   Drives: LET Vectra B
User status: Offline
19th Dec 07 at 23:09   View User's Profile U2U Member Reply With Quote

I'll check the wires tomorow but I'm sure they are good connections.
Richie
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Registered: 3rd Dec 02
Location: Newport, Wales
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19th Dec 07 at 23:21   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Olsrey
Yes but thats another fault with the car as the EML flickers and my fault code reader just displays "ERROR!" when ever I try to connect to the ecu.


You've done a conversion I take it?

My guess the diagnostic plug isnt wired up correctly. You tried the paper clip test to see if that does / does not work?
Olsrey
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Registered: 13th Jan 07
Location: Bradford   Drives: LET Vectra B
User status: Offline
19th Dec 07 at 23:31   View User's Profile U2U Member Reply With Quote

Yes did it myself, had B3KAN help me with the wiring. Not done a paperclip test due to not knowing which pints to short out.
luke85
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Registered: 26th Nov 07
Location: Chesterfield
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19th Dec 07 at 23:34   View User's Profile U2U Member Reply With Quote


Or


Depending on which plug you have. Thats if the wires to the ECU have been matched up colour for colour


[Edited on 19-12-2007 by luke85]
Olsrey
Member

Registered: 13th Jan 07
Location: Bradford   Drives: LET Vectra B
User status: Offline
19th Dec 07 at 23:37   View User's Profile U2U Member Reply With Quote

They have been, I have 3 wires left on the corsa loom, (red/white, black/blue, black/green). Is that as it should be?
Olsrey
Member

Registered: 13th Jan 07
Location: Bradford   Drives: LET Vectra B
User status: Offline
22nd Dec 07 at 21:37   View User's Profile U2U Member Reply With Quote

Just done a paper clip test, but I need to shorten the video. How long would a typical test take to get all the flashes in?
mac1976
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Registered: 29th Dec 06
Location: tullibody , clackmannanshire
User status: Offline
22nd Dec 07 at 22:59   View User's Profile U2U Member Reply With Quote

m,ines was doing the same as yours mate with the em light and overfueling
it was a bad earth on the fuel rail and the air flow meter was shaged
Olsrey
Member

Registered: 13th Jan 07
Location: Bradford   Drives: LET Vectra B
User status: Offline
22nd Dec 07 at 23:07   View User's Profile U2U Member Reply With Quote

Mine has the wrong ron plug on , thats my theory as to why it is overfueling and I've checked all earths.

 
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