Engine Noise

[CP1 Lurker Find all posts View Profile Close CP1]

has anyone experienced a noise similar to air pressure relief valve going off when vehicle is under load / accelerating ?. I have a 2002 3.4 litre V6 Prado have 105,000km on clock . Our mechanic thought it may be a faulty petrol cap but have changed it out with now difference, He has also discounted a faulty oxygen sensor it is spasmotic and only last for a second.

[debker Lurker Find all posts View Profile Close debker]

yeh your right about the air pressure valve dont affect performance turn stereo up, dont hear it.

[Steve M Addicted PP Member Find all posts View Profile Close Steve M]

May seem a silly question, but does your 90 have duel aircon (front and back) ?? Cheers Steve

[croozza Avid PP Poster! Find all posts View Profile Close croozza]

May seem a silly question, but does your 90 have duel aircon (front and back) ?? Cheers Steve

I dont think the dual air will have any bearing into the noise, the air compressor is basically the same as the single a/c vehicles, just a different top on it and a few different electrics, to allow the independant front or rear operation. I would more likely be thinking exhaust.

[Steve M Addicted PP Member Find all posts View Profile Close Steve M]

Reason I mention aircon is when I had one of my 90's which was a petrol and been a grande when the duel air was running every now and then it made this whooshing sound which was coming from rougly around the fire wall. Never really bothered to find out what is was as it never gave me any troubles but when the duel air wasnt runnning it never made the noise, only when running both coolers. If running just the front air it never made the noise. I did check it out and there was a valve on the fire wall on drivers side which alot of the aircon pipes ran to which then ran to the rear of the car. I reckon there was an airlock in the system because it started doing it after I had the air regassed........Cheers Steve

[croozza Avid PP Poster! Find all posts View Profile Close croozza]

Yeah, i know what noise you mean, it is just the gas circulating through the system