How To Adjust Tps And Idle On R32 Gts-t

[G Kanobi]

Hey guys,

my 32 gts-t is idling at around 1,500rpm, and it feels the tps could possibly be a cause. It feels a little out, when switching from light throttle to no throttle at low speeds, kicks and jerks around alot.

Has anyone else experienced this? I've had a look around but can't find anything clear on how to adjust these.

What RPM is normal for idle on a rb20?

cheers guys

[paulr33]

normal idle is around 900rpm or less even 800rpm (its on a sticker on the underside of the bonnet)

if TPS is dead RPM will jump and peg at 1500rpm as a failsafe for the engine

so if you see your idle ramp to 1500rpm and sit there, the TPS is toast, that is, the value its telling the ECU is out of range, ie: its probably 0.0 when it happens.

if the TPS is toast the car will be jerky as cos the computer will try and detect and determine load from the TPS, but the sensor goes to 0.0 (lets say) so it jerks and is stally

[battery]

i have the same problem at the moment, no idea whats causing it.

[G Kanobi]

i have the same problem at the moment, no idea whats causing it.

Probably what that guy said.

That's shit news but a mad bit of advice man, cheers!

Do you know roughly off the top of your head how much a new TPS is?

Edited July 10, 2008 by G Kanobi

[sly32]

they arnt that much at all, could probably find 1 for $50 or something, me and my mates did a engine conversion on a laurel putting a rb20det into it, when we hooked it all up and started it it ran like crap, miss firing and everything, trying to pull all the plugs off and re do it, we found out it was the afm that was unplugged, so we started it again and it went straight to 1500rpm and still just wasnt running right which was pissing me off even more, found out my mate didnt plug the tps back in properly ands the idle dropped down to 1000rpm, so i think tps is the right track, at least its not hard to change,

gl with it,

[NWR31]

how about knocking 100revs or so off the idle?

i tried the screw in the front of the ecu, but it did squat.

mine sits at about 1000/950 which i find a bit annoying :|

Edited July 10, 2008 by norwest_rumbler

[GeeTR]

The grubscrew on the idle stepper.

[R34GTFOUR]

if it sits dead on 1500rpm, the tps is bugger as mentioned above. If there is anthing wrong with the tps the ecu will go into a safe mode and just idle at 1500rpm. Check your voltages at the tps at fully closed and open, and if they seem correct adjust the idle screw on the throttle body.

Edited July 10, 2008 by R34GTFOUR

[NWR31]

The grubscrew on the idle stepper.

where is the idle stepper located? i have a r32 silvertop.

is it the round thing about the size of a D size battery with wires coming out of it thats mounted on the top rear of the intake manifold?

or is it the thing that looks like a diaphragm with hoses coming out of it below the throttle body? (doubt it)

either way i cant find any adjusting screw

[GeeTR]

AAC on a RB20DET is located on the firewall side of the i.plenum, it's rather D size I guess'ish hah.

Nissan say 600rpm.

Edited July 11, 2008 by GeeTR

[NWR31]

AAC on a RB20DET is located on the firewall side of the i.plenum, it's rather D size I guess'ish hah.

Nissan say 600rpm.

thanks a heap i never would have found it without that info.

it was seized up, but a bit of wd40 fixed it. i set the idle to 600, even had it ticking over at about 400 no probs.

cheers

[G Kanobi]

alright cool, so how do you go about adjusting it??

[NWR31]

you can see the screw from the drivers side of the engine bay.

all you need is a flat blade screwdriver to turn the screw, clockwise (winding it in) will reduce the idle speed.

best to adjust it when the car is at operating temp

cheers

[G Kanobi]

cheers mate, Ill give it a shot