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Technical  Lambda Sensor

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Technical  Lambda Sensor

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thadford

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Hi guys, just signed up to the forum as have been using it extensively for the past few months to help with maintaining my cinqi!

Anyways its a 1994, 899cc model, and the fuel injection light is on permanantly, also it stalls for no reason when its idling and sometimes misfires. From reading the posts on here it sounded to me to be the lambda sensor, and the exhast looks pretty charred and dirty... Anways was wondering if anyone knew if the sensor out of our donor cinqi sporting would fit, (its an R reg), and that way i can find out if it is the lambda or not...

Many Thanks,

Thad
 
custard boy said:
easy way to check is ot count the wires on the connector. sporting is a 4 wire lambda
Click to expand...

I forget exactly how many wires it has, but IIRC its at least 4. But it has 2 x 4 way connector blocks, so it could have 8!!.

I'll check mine and repost.

thadford...I have an 899cc lambda sensor sat here doing nothing. If you want that for testing, make me an offer by PM :)
 
Looks a wee bit like cause rather than effect though. The lambda sees the exhaust fumes and is seeing them as too rich. It is trying to sort it but can't so puts the light on. When was the car last serviced?

Cheers

D
 
cheers for the replies guys, spent the day up to my elbows in engine and oil from my apparently leaky sump... Anyways managed to canibalise the sensor from the sporting, and with a bit of bodged wiring got it in and working. It ticked over beautifully when i started her up, smooth idling and no worries about the light. Then after i drove her for a mile or so problems all started again :-(.

In response to rallycinq's reply it was last serviced and MOT'd 2 weeks back, had plugs changed, oil changed, new air filter... I'm at a loss really, was thinking that tomorrow i might test the coils...
 
OK, so sounds like a problem when the lambda switches on. The lambda is not in the circuit until it warms up. Now this is where it gets complicated.

I am not convinced by coils, after its run badly for a while, whip the plugs out. If they are wet, then its a coil problem. If they are dry and black its a fueling problem, so I would be looking at map sensor and pipe, or another vacuum pipe off somewhere. The engine thinks its drawing too much air and the lambda is over fuelling.

But it is late on a busy Sunday!!

Cheers

D
 
Cheers, have decided it best to go and get the ECU read next month once pay comes in. At least that way I'll (hopefully) know what needs doing!

Thanks for the usefull tips

Thad
 
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