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I need to adjust the fuel/air mixture as my car is running a bit leane, it's got a 4g67 fitted.

There seems to be something on the bulk head with arrows on and a R and a L, I presume that's it but there's nothing to turn in the middle just a round lump.

Can somebody please help??

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playing with the same colt since 2002 and still going.....

Carby??? There is no adjustment for the EFI motors. I am confused.

To do it properly, you would need some sort of piggyback fuel controller that would allow you to richen and lean the mixture, and use that in conjunction with a wideband 02 sensor do you know you're doing it right. There is an adjustment screw on the bottom of the mass-air sensor that you can play around with, but usually people do that to make their cars run even more lean, same with removing honeycombs from the MAF, that just leans you out more. There is no screw or any other device that allows you to adjust the air/fuel mixture on a fuel-injected car.

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91 GSX - 511fwhp and 352 lb/ft 25psi 110 octane, 7.68 @ 95.9mph 1/8th 21psi 91 octane, 11.93 @ 112.9mph, 117.7mph best trap speed, 20psi 91 octane
98 Volvo S70 T5 - DD

http://www.facebook.com/captaintonus

I was unsure if the colt had one as I know there is a few efi cars with a electronic remote adjustment screw.

The main reson im asking is the car had a emotions test the weekend and it's come back very low which means it's running lean, anybody got any ideals why this could be as I'm bound to be loosing power.

Also what this if not a mixture adjustment,

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playing with the same colt since 2002 and still going.....

Whoa, that's crazy! Never seen anything like that on a US car.

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91 GSX - 511fwhp and 352 lb/ft 25psi 110 octane, 7.68 @ 95.9mph 1/8th 21psi 91 octane, 11.93 @ 112.9mph, 117.7mph best trap speed, 20psi 91 octane
98 Volvo S70 T5 - DD

http://www.facebook.com/captaintonus

I'm wondering if some how it's some sort of adjustment as uk emmition laws are probably stricter that those in the US?

It also has a half moon shape arrow on it and a "R" one end and a "L" the other end, it can't be left and right as there back to front, my guess was "rich" and "lean"?

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playing with the same colt since 2002 and still going.....

Yes, R would mean rich and L would mean lean.

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91 GSX - 511fwhp and 352 lb/ft 25psi 110 octane, 7.68 @ 95.9mph 1/8th 21psi 91 octane, 11.93 @ 112.9mph, 117.7mph best trap speed, 20psi 91 octane
98 Volvo S70 T5 - DD

http://www.facebook.com/captaintonus

It would be nice to know which pins those go to on the board.

Well, that is one cool looking switch/pot/resistor type thing. Almost looks like the color of the wires for the thermostat, but there are so many similar wires on top of the motor.

The EUDM C53A 4G61 N/A Colt come without O2 sensor, YES no lambda...
Have you swapped the engine harness from a C58 ? ECU ?

This part is idle fuel control variable resistor.
Im curious also for the tool needed and i have only the USDM workshop manual
Maybe VR4AWD on ColtUK has this EUDM manual, let me know thanks.

Sometimes this same car come with the 7 wire "idle reset" on the MAF like the turbo motor.
Also, no canister but a 2 way vapor valve and a breather tank. Perfect parts for delete the hard vapor line below the car
I have this mod on my Dodge Colt !
Look this picture :

I swapped everything loom ecu engine inlet gearbox the lot.

I've spoken to mike vr4awd and he does not know what it is eather??

Really strange one, think I might have to talk to my mate at mitsi about it.

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playing with the same colt since 2002 and still going.....

I have found this workshop manual on Ebay recently :


All three confirm this thing :
Colt and Lancer pre-facelist come in Europe without narrow band sensor or catalyst.

My Colt 4g61 n/a has this fuel control variable resistor.
After a k&n install my motor run lean, i have adjusted my AFR with this variable resistor and my UEGO

This is a electric diagram picture :

This resistor is pluged on the baro sensor

No more information about that thing on internet, sorry ...