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how do you tune up an ea82t from a 85-86 RX?
on idle it blows a bit of petrol smoke..is there an adjustment on the AFM or throttle body etc?

cheers

wrx_nut

wrx_nut wrote:how do you tune up an ea82t from a 85-86 RX?
on idle it blows a bit of petrol smoke..is there an adjustment on the AFM or throttle body etc?

cheers

wrx_nut

There is no easy tune-up, set tune all done by the computer. Do you have rich fuel at idle and WOT? You may have a faulty sensor or incorrect match if converted or a sticky injector. Sorry cant be specific as it is a process of elimination.

It is possible to make small adjustments to the idle mixture on the EA82T with flap type airflow meter (ie. the 85-86 models) as the Airflow meter has an air bypass adjustment on it. On import motor's it's under a black plastic cap on top of the AFM that flips off exposing the adjustment screw. On Australian delivered models (that' I've seen anyway) it is heaps harder to get to as it appears to have a metal cap press fitted over the adjustment screw that would probably need to be drilled out. If you do make any adjustments to the AFM note down exactly how much adjustment was made as if the rich condition does indeed turn out to be another problem (faulty temp sensor, leaky injector etc), then you can return the AFM to it's original settings.

yer think is has the metal cap, dont really want to play with that :P
it just blows a little bit of petrol smoke on idle but unsure of WOT.....
if it is a faulty sensor which should i look at? i did convert it from a carby motor whats an incorrect match?
im not getting any fault codes from the computer either

thanks

wrx_nut

Couple of areas that I'd check are the engine temp sensor that the ECU uses. Don't confuse this one with the temp sensor that goes to the dash temp gauge. The ECU sensor is towards the rear of the engine adjacent the turbo and points directly upwards, the connector commonly fills up with water if the rubber boot is cracked and then the terminals corrode. The gauge sensor is on the thermostat housing. Something else to check would be fuel pressure to make sure it's not to high, and also check the fuel return line to the tank is not restricted. Unfortunately I don't have the specs for fuel pressure or temp sensor resistance anymore. Also, a bit of a long shot but it could also be a lazy oxy sensor on the exhaust. This would be the easiest to check by simply unplugging it. If unplugging it corrects the problem it's probably best to replace the sensor rather than leave it disconnected as you may get other performance/fuel consumption issues.

If you have an EA82T with a flapper try the water temp sender (to ECU) as mentioned above as its probably your cause. If the O2 sensor is disconnected it will run leaner so smoke shouldnt be an issue but if the wire has melted or earthed it will run rich.

I was getting nowhere when I was fault finding, ended up getting someone check the Air/fuel ratio for me to gauge "how lean" in my case. This applies to richness too, as a full test under load will provide some ballpark figures and can check back later for any improvement.