Temp gauge reading cold

[lars04]

Have a gq with the rb30 efi. Conversion, the temp reads really cold it sits just above the bottom line even doing 120 on the highway is this normal?
Also have hooked a aftermarket gauge and reads the same think it was just above 40

[garett]

i had a similar problem, my thermostat seized open.

[Coger]

Change thermostat first, with a factory one, should fix your problem.

[lars04]

Cheers fellas I'll check it out, what should it read at?

[garett]

well mine being a td42 it reads on the original about 1/3 pretty much everywhere doing almost anything. as for actual temp for an rb30 i guess about 80 ish deg ( an rb30 guy should be able to give a more acc guide) it will depend on which thermostat though a 77 deg will run a bit cooler than the 82 deg.

[dom14]

Have a gq with the rb30 efi. Conversion, the temp reads really cold it sits just above the bottom line even doing 120 on the highway is this normal?
Also have hooked a aftermarket gauge and reads the same think it was just above 40

The temperature should be 80-85 fully warmed up.
Get a genuine factory one. I bought an after market one off ebay but for the same price you can get genuine one here

http://patrolapart.com.au/product/nissan-patrol-gq-y60-genuine-thermostat-suit-rb30/nissan-patrol-gq-y60-genuine-thermostat-suit-rb30

It made a huge difference in mine. Engine's running lot happier now.

Low temperature and high revs is a bad combination for piston rings and walls.

[lars04]

Thanks mate will order now! So that could explain the random hight revs it has

[dom14]

Thanks mate will order now! So that could explain the random hight revs it has

Running at too low temperature causing random high revs? I'm not sure about that.

[lars04]

Any idea what would be doing that? Doesn't always happen and only does it for a short time then drops to normal

[garett]

is like choke kicking in? the efi should have a choke like running condition if the temp drops it could be bringing the revs up to warm the engine.

[lars04]

Yea that sounds about right usually only does it on first start up of the day or if it's been left awhile

[dom14]

is like choke kicking in? the efi should have a choke like running condition if the temp drops it could be bringing the revs up to warm the engine.

Yeah, but it ECU shouldn't do that randomly, should it? May be it's not that random as OP says, but only when the engine's cold started.

[lars04]

Hmmmmmm is there like a stepper motor or something like that on rb30 motors?

[dom14]

Hmmmmmm is there like a stepper motor or something like that on rb30 motors?

Stepper motor in where?!!

I reckon you experience high idling revs for too long when engine's cold started. Ideally it should settle once the engines warmed up, but that can be some time in cold weathers. Replace the cold running thermostat asap though. No good can come out of it, as I've experienced with mine.

Choking method in EFI ones afaik is the ECU causing the injectors to spray extra fuel.

[garett]

Stepper motor in where?!!

I reckon you experience high idling revs for too long when engine's cold started. Ideally it should settle once the engines warmed up, but that can be some time in cold weathers. Replace the cold running thermostat asap though. No good can come out of it, as I've experienced with mine.

Choking method in EFI ones afaik is the ECU causing the injectors to spray extra fuel.

i think he's referring to the idle bypass motor.

[lars04]

All good, found out I've got a sticky cable or something if I push up with my foot on the accelerator and it idles nice.