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Possum link cold start


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Gidday all, 

It's been a while, Right I'm looking for some info/additional input for a possum link cold start issue I've started to notice.

so I start the car & it runs as it should, & then as it starts to warm up it gets a little bit rougher running & gets to the point where it's missing & hesitating.

so I can see when I start the car from cold the temps at 14 degrees & I suppose the links compensation number is say 34.

now as the temps rise that compensation number comes down 1 for every two degrees (say 16 degrees is 33 & 18 degrees is 32 & so on & so on) 

so its when it gets upto 60-70 degrees & the numbers get down to 2-1-0 where I have the hesitation & missing ect AFR's get all over the show get pretty lean ect.

so its not, spark plugs, coils, head gaskets, fuel pump & pressure, injectors, tps, Iacv.

 

Could it be coolant temp sensor?? 

 

Cheers CUDDAS

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4 hours ago, Batbaruman said:

is there a certain time duration? wonder if could be o2 sensor or something as it goes from open to closed loop

Hmmmm, yes it may be that too..... Had crossed my mind but then I wasn't sure if the link used it. 

As I watch the temps go up & the numbers count down, there is a definite engine note for each adjustment as it progresses through the range & the wideband afr go from rich to lean too.

o2 could be a possibility, 

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I haven't ever had an older link but from playing with the newer ones;

 

What are the rich and lean values?

 

As you said the possum link wouldn't have the o2 as an input, but unplug it and find out.

The coolant temp sensor showing 60-70 sounds normal.

 

If a sensor is faulty (and the engine check light is an output and the error values in the link are configured right) the link will blink the engine check light.

 

Sounds like a tune issue, have you plugged in a laptop (assuming it is laptop compatible) 

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