RB20 AFM's HELP!!!

[CS_180]

Has anybody else had issues with afm before?

about 6months ago i was having major issues with the car idoling at 2000rpm and not reving above that when accelerating. Afm was changed after a week of testing everything and that fixed the problem, Now it seems its starting to do it again and its driving me nuts. What are the odds of having two Afm stuff up with in 6months in exactly the same way??

Can anyone help me out ? Any ideas?

thanks

tim

[The Dan]

yeah, I got the same problem. And unless you fitted a brand new AFM then it is highly likely that it will happen again. most of them are like 14-15 years old now so it's getting hard to find good ones.

[BoOsTeD_RB26]

Try giving it a clean just in case its a bit dirty.

Go and pick up some electronic contact cleaner from Dick Smith or somewhere like that. This cleans the afm and does not leave any residue on the wire. Usually fixes most issues. Costs about $15 a can.

All the best

[gts4diehard]

hi, check your TPS sensor plug that connects to the throttle position sensor. My car idled at 2000 rpm one day when the plug 'was left unconnected' and wouldnt accelerate cleanly. I thought something had gone majorly wrong, but once I plugged the tps plug back in all was sweet. I think the computer uses some of the other info to make an estimate on the fuel should the sensor fail, and runs a safer tuning map for the engine as a precaution.

It could also be the AFM, try cleaning the thin wire in the centre of the AFM with CRC contact cleaner, it is supposed to 'self clean' once the ignition is switched off by rapidly heating the wire to burn off any deposits, this probably isnt working so good after 10-12 yrs especially if you have an oily aftermarket air filter in there. It could also be the solder inside the square box attached to AFM, it could be dry when wires conect to the pins that the plug connects to. If you are sure that AFM is no good and are going to buy another, give it a go at repairing it, check the forums for some info. Just make sure when you are doing the soldering that you dont let too much heat get anywhere else( use heat sinks).

I did mine years ago and it is still going strong.

Stephen

[CS_180]

thanks guys

i pulled it off and sprayed it with WD40 of all things and it seems to be going fine now.

thanks again

[The Dan]

WD40 is the worst thing you can spray it with as it will leave a residue on the wire and distort the reading. Maybe even damage the AFM. Use something like Carby clean or throttle body cleaner or for a more expensive alternative, try using that Contact crap.....never WD40 though.

[BoOsTeD_RB26]

Eek Yeah I would clean it properly very quickly if I were you....

At least you've found your problem though hehe :D