Jump to content
SAU Community

Recommended Posts

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 :whistling:

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

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 by G Kanobi

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,

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 by norwest_rumbler

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 by R34GTFOUR
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

:D

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

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

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Have a look at that (shitty) pic I posted. You can see AN -4 braided line coming to a -4 to 1/8 BSPT adapter, into a 1/8 BSPT T piece. The Haltech pressure sender is screwed into the long arm of the sender and factory sender (pre your pic) into the T side. You can also see the cable tie holding the whole contraption in place. Is it better than mounting the sender direct to your engine fitting......yes because it removes that vibration as the engine revs out 50 times every lap and that factory sender is pretty big. Is it necessary for you......well I've got no idea, I just don't like something important failing twice so over-engineer it to the moon!
    • Yup. You can get creative and make a sort of "bracket" with cable ties. Put 2 around the sender with a third passing underneath them strapped down against the sender. Then that third one is able to be passed through some hole at right angles to the orientation of the sender. Or some variation on the theme. Yes.... ummm, with caveats? I mean, the sender is BSP and you would likely have AN stuff on the hose, so yes, there would be the adapter you mention. But the block end will either be 1/8 NPT if that thread is still OK in there, or you can drill and tap it out to 1/4 BSP or NPT and use appropriate adapter there. As it stands, your mention of 1/8 BSPT male seems... wrong for the 1/8 NPT female it has to go into. The hose will be better, because even with the bush, the mass of the sender will be "hanging" off a hard threaded connection and will add some stress/strain to that. It might fail in the future. The hose eliminates almost all such risk - but adds in several more threaded connections to leak from! It really should be tapered, but it looks very long in that photo with no taper visible. If you have it in hand you should be able to see if it tapered or not. There technically is no possibility of a mechanical seal with a parallel male in a parallel female, so it is hard to believe that it is parallel male, but weirder things have happened. Maybe it's meant to seat on some surface when screwed in on the original installation? Anyway, at that thread size, parallel in parallel, with tape and goop, will seal just fine.
    • How do you propose I cable tie this: To something securely? Is it really just a case of finding a couple of holes and ziptying it there so it never goes flying or starts dangling around, more or less? Then run a 1/8 BSP Female to [hose adapter of choice?/AN?] and then the opposing fitting at the bush-into-oil-block end? being the hose-into-realistically likely a 1/8 BSPT male) Is this going to provide any real benefit over using a stainless/steel 1/4 to 1/8 BSPT reducing bush? I am making the assumption the OEM sender is BSPT not BSPP/BSP
    • I fashioned a ramp out of a couple of pieces of 140x35 lumber, to get the bumper up slightly, and then one of these is what I use
    • I wouldn't worry about dissimilar metal corrosion, should you just buy/make a steel replacement. There will be thread tape and sealant compound between the metals. The few little spots where they touch each other will be deep inside the joint, unable to get wet. And the alloy block is much much larger than a small steel fitting, so there is plenty of "sacrificial" capacity there. Any bush you put in there will be dissimilar anyway. Either steel or brass. Maybe stainless. All of them are different to the other parts in the chain. But what I said above still applies.
×
×
  • Create New...