Still Hunting...

[Medium Dave]

Hey all,

I have been having hunting problems for a while and I have searched and done all the things geneally listed- aac valve, afm, grounding etc. Now when it hunts it will raise the revs slowly to 1500rpm, then stay there, if I turn on the air conditioning it will raise again to 2000rpm then slowly drop back to a normal idle for the rest of the trip I have installed an afr meter and the mixtures stay within stoich, so its not dumping in extra fuel... Oh, this may sound silly now I think about it, but I havnt re-gassed the aircon, it was ok for the first 4-5 months without... I know, I know... but ac is useless in a tassie winter

If its possible that that is the problem, or if you can think of anything else to look into, your ides would be greatly appreciated

[mad082]

how did you hook up the afr meter? did you solder it, or use joiners? if you used joiners go out and solder it straight away. also it should flicker, or run lean at idle, and when you gas it run to rich. if it doesn't then get a new o2 sensor.

[kjb_r33]

I know you said A/F ratios are right, but id be inlined to check fuel pressures, high presssure at idle can cause hunting. Also check for air leaks

[Medium Dave]

Yeah, the afr meter is spot on, I might check the fuel pressure tho, thanks guys - still confused as to why it stops hunting if i turn the ac on then off... ah well, I'll get there

[Medium Dave]

Actually, you have got me thinking... hmm...

[maccattack]

Dave,

Hunting problem I had ages ago was blamed on the aircon thermo switch. From what I was told - is fairly common.