TPS help

[pointz]

can anyone tell me how to correctly set my throttle position sensor?
i have just rebuilt my ca18 and am trying to get the timing spot on 15degrees but my idle is slightly up and down would the TPS have anything to do with this as i removed it from the plenum / throttle body whilst cleaning and painting the plenum!

Thanks

[skyshack]

2 ways.

On the idle switch which is the connector molded on the front. Top 2 pins are idle switch. Set it so it just switches off at idle + 50rpm = 900rpm.
OR
On the TPS - cable from bottom of TPS. Back probe by putting thin stiff wire into middle. Move TPS to set at 0.5V.

[pointz]

2 ways.

On the idle switch which is the connector molded on the front. Top 2 pins are idle switch. Set it so it just switches off at idle + 50rpm = 900rpm.
OR
On the TPS - cable from bottom of TPS. Back probe by putting thin stiff wire into middle. Move TPS to set at 0.5V.

1 how do i know when it switches off?
2 "Back probe by putting thin stiff wire into middle." i don't quite understand what you mean by this!

[ricardomendes]

1 how do i know when it switches off?
2 "Back probe by putting thin stiff wire into middle." i don't quite understand what you mean by this!

see the manual it show what you need to do with pictures, but is just like skyshack says, set the output voltage at 0.5v.

[pointz]

that still doesn't explain what he means by this "Back probe by putting thin stiff wire into middle."

Reading through the manual it says to set idle speed first so went to do this following the procedure in the manual and i can't get it to idle any higher than 720ish rpm,
does this mean the idle control valve is knackered?

it also smells as though it's running very rich on idle would the mixture screw on the AFM need adjusting?

Better add it's prefacelift so no lambda!

[skyshack]

that still doesn't explain what he means by this "Back probe by putting thin stiff wire into middle."

Reading through the manual it says to set idle speed first so went to do this following the procedure in the manual and i can't get it to idle any higher than 720ish rpm,
does this mean the idle control valve is knackered?

it also smells as though it's running very rich on idle would the mixture screw on the AFM need adjusting?

Better add it's prefacelift so no lambda!

Sorry, missing some words.
Back probe by putting thin stiff wire into back of middle pin. Mod to a standard multimeter probe is shown on page EF&EC-79. The TPS has to be connected to get a voltage reading so the probe wire is slid up the side of the loom wire to make contact inside the connector.

For idle switch use a meter set on ohms or continuity test. Don't back probe, unplug it connect on top 2 pins, page EF&EC-100. If throttle is shut it should have 0ohms. As throttle is opened it should lose contact.

To set idle the idle control valve should be unplugged. If engine stalls unscrew the hex head adjuster on idle assembly and try again EF&EC-26 / 30 / 31.

[pointz]

cheers skyshack that explains it alot easier will have a go at that this evening! only prob is that i can't set my idle, iv'e been following the procedure in the manual and turning the idle screw either way with the idle control valve un plugged makes no difference so i'm thinking the ICV is knackered?

[skyshack]

Remove the whole assembly and clean it.

Check there are no missing vac hoses. An air leak will affect idle badly.

[pointz]

ok so i have set my TPS correctly 0.5v and have pressurised all my i/c pipework from turbo to plenum to 1.5 bar and fixed 1 small leak, also cleaned my idle control valve and still cant get my idle higher than 720-750 rpm!
really starting to puzzle me now, i'm going to run a fault check on the ecu tomorrow and have ordered a new temp sender for the ecu so hopefully that'll be with me tomorrow.
Any more suggestions?

[pointz]

no one had issues with getting their idle up?