Ae82 Wont Stop Revving Up And Down!

[waqarv]

my recent ae82 wont stop revving up and down, at first i thought it needs water topping up, still no difference, then i changed thermostat and radiator still no different, and also no warm heaters only cold and sometimes a little warmish

any solutions i can try??

the engine has had a rebuild in the past and i hope nothing was missed out due to this problem.

any help is really appreciated, thanks.

[Mick24]

Big airlock in the cooling system by the sound of it.

Mick

[4afte]

what kind of revving up and down is it? hunting at idle? or under load?

i'f it's hunting at idle it may be the lambda sensor.

[waqarv]

right, i changed the water thermo sensor ( the old one had a hole in it) and also changed some inlet air pipes, this seems to have cured the revving , but i still dont have any warm heating.

[chaycore]

i found on my 4age, it was the idle up valve which stayed open which caused the over revving, cured it completely. what do you mean by warm heating?

[waqarv]

heaters are not getting hot, only cold.

[4afte]

can you physically see the heater valve operating in the engine bay? if not the cable may be broken.

[sealslayer]

I had this same problem on my last Ae82, I did everything you've listed in this thread and after a couple of days I got the dreaded sound of clanking followed by a blown head gasket :(