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Truck revving up and down by itself
Posted: Thu Feb 07, 2013 4:08 pm
by a80crewza
Okay, so I started my truck up this morning and the engine (1kz) revs up and down by itself? Didn't notice it after it got warm. So it's not a faulty speedo. Could it be a vacuum leak? A cracked hose? (Ive recently put it a manual boost controller).
Re: Truck revving up and down by itself
Posted: Thu Feb 07, 2013 4:34 pm
by Jerry
could be early signs of an ecu fault, the caps in them go, how much is it revving?
Re: Truck revving up and down by itself
Posted: Thu Feb 07, 2013 4:39 pm
by a80crewza
Jerry wrote:could be early signs of an ecu fault, the caps in them go, how much is it revving?
Not much, maybe between 600-900rpm.
Re: Truck revving up and down by itself
Posted: Thu Feb 07, 2013 5:49 pm
by pressy
hi it sounds like the air con, does it have air con and does it work? sorry for the possible dumb question?
Re: Truck revving up and down by itself
Posted: Thu Feb 07, 2013 5:52 pm
by a80crewza
Yeah its got air con and it works, I can't see how it would be the air con as it wasn't on when the revving up and down occurred. And when I did put the air con on, no revving happened.
Re: Truck revving up and down by itself
Posted: Thu Feb 07, 2013 5:57 pm
by curly12
Re: Truck revving up and down by itself
Posted: Thu Feb 07, 2013 6:00 pm
by a80crewza
Yeah, it has been warm here, then it pissed down the other night..
Could you please explain what you reckon it could be

Re: Truck revving up and down by itself
Posted: Thu Feb 07, 2013 6:02 pm
by curly12
luxsurf wrote:Yeah, it has been warm here, then it pissed down the other night..
Could you please explain what you reckon it could be

Aircon switch needs to be taken apart and crc or w40 sprayed in it to free it up
Re: Truck revving up and down by itself
Posted: Thu Feb 07, 2013 6:13 pm
by a80crewza
curly12 wrote:luxsurf wrote:Yeah, it has been warm here, then it pissed down the other night..
Could you please explain what you reckon it could be

Aircon switch needs to be taken apart and crc or w40 sprayed in it to free it up
Okay, where can I find the aircon switch?
Re: Truck revving up and down by itself
Posted: Thu Feb 07, 2013 6:21 pm
by curly12
luxsurf wrote:curly12 wrote:luxsurf wrote:Yeah, it has been warm here, then it pissed down the other night..
Could you please explain what you reckon it could be

Aircon switch needs to be taken apart and crc or w40 sprayed in it to free it up
Okay, where can I find the aircon switch?
On the dash???

Re: Truck revving up and down by itself
Posted: Thu Feb 07, 2013 8:01 pm
by kbjj
Re: Truck revving up and down by itself
Posted: Thu Feb 07, 2013 9:02 pm
by Crash bandicoot

classic
Re: Truck revving up and down by itself
Posted: Fri Feb 08, 2013 12:38 pm
by a80crewza

Is it the dash switch your talking about

Or the air con pressure switch??
Re: Truck revving up and down by itself
Posted: Fri Feb 08, 2013 9:26 pm
by curly12
Re: Truck revving up and down by itself
Posted: Sat Feb 09, 2013 7:36 pm
by benorange
just to throw you off a bit. mine does the same randomly but it not the aircon pump as i had the belt off. mine was played with before i got it had the dump pipe added and the pipe from intake to exaust removed and there is also oil coming from something up top at back. it also lacks power sometimes. just havent been able to get it off road to look at yet.
Re: Truck revving up and down by itself
Posted: Tue Feb 12, 2013 1:05 pm
by a80crewza
Just disconnected both the batteries to reset the system and that fixed the problem.. for now. Must be the ecu.