i've recently had a little problem when starting the zed. it fires up without a problem but after about 10 15 seconds the idle drops to about 300 until i give it a few revs. I've also found that when this happens, if i turn the engine off and then on again it runs fine. anyone got any idea on what could be causing this?

by the way its a n/a if that makes any difference.

Fuel pump

Fuel pump ecu

Fuel pressure regulator

IAA (the idle control value at rear of the engine near the battery) it could be sticking when cold...

MAF or PTU...

and the list goes on......

 

I would check all connections to make sure that non are corroded and all are seated well.

do the usual checks, tps voltage, timing, clean MAF.

the IAA can be taken off and cleaned... or just spray some WD40 in it... see if that fixes it..

 

http://www.pexcom.com.au/z32cms/e107_plugins/content/content.php?content.335

 

go from there....

would any of these things also be causing another problem that i've had? when i hammer it for a bit, then go back to normal driving the car stutters abit at low revs?

Check your TPS and the base idle settings.

i'm not very good with anything mechanical, what exactly is a tps? and if poss a photo would be very helpful.

The tps (Throttle Position Sensor) is a little black box on the side of the passenger side throttle body. It's a potentiometer that lowers resistance when the throttle is opened. When closed the voltage is around 0.44v and opening the throttle turns the sensors pot which allows more voltage to pass. This is read by the ECU and used to identify the throttle position.

 

Problems arrise when the base voltage is set to low or high, when this happens the ECU can't adjust the fuel air mix correctly for how far open the throttles are. This gives you problems when idling etc..

 

A volt meter will tell you what voltage the tps is set at when closed and it can be adjusted by simply undoing the screws and rotating the TPS left or right by small amounts. Keep doing this until the voltage reads a steady 0.44v. Once the voltage is correct you will need to reset the the tps by unplugging the lead for 10 seconds with the engine running.

 

Once the TPS is correctly set then you can move on to the IAA or the Idle Air Adjustment valve at the back of the engine on the passenger side. There is a screw head on the valve facing the battery, unplug the yellow connector on the valve and adjust the screw until the revs are at 750rpm. When done plug the yellow connector back in and the revs should then increase as the ECU takes over. Once the engine is at running temp the rpm should drop back down to 750. Do all this with the engine running.

 

HTH mate :)

Top info there Steams!

excellent descriptions and wording, even i can understand that. i'll give it ago as soon as i get a chance. cheers mate

Top info there Steams!

 

Cheers bud, don't what came over me there :lol:

 

excellent descriptions and wording, even i can understand that. i'll give it ago as soon as i get a chance. cheers mate

 

Your welcome mate, I hope the info helps you sort out your problems :)

The tps (Throttle Position Sensor) is a little black box on the side of the passenger side throttle body. It's a potentiometer that lowers resistance when the throttle is opened. When closed the voltage is around 0.44v and opening the throttle turns the sensors pot which allows more voltage to pass. This is read by the ECU and used to identify the throttle position.

 

Problems arrise when the base voltage is set to low or high, when this happens the ECU can't adjust the fuel air mix correctly for how far open the throttles are. This gives you problems when idling etc..

 

A volt meter will tell you what voltage the tps is set at when closed and it can be adjusted by simply undoing the screws and rotating the TPS left or right by small amounts. Keep doing this until the voltage reads a steady 0.44v. Once the voltage is correct you will need to reset the the tps by unplugging the lead for 10 seconds with the engine running.

 

Once the TPS is correctly set then you can move on to the IAA or the Idle Air Adjustment valve at the back of the engine on the passenger side. There is a screw head on the valve facing the battery, unplug the yellow connector on the valve and adjust the screw until the revs are at 750rpm. When done plug the yellow connector back in and the revs should then increase as the ECU takes over. Once the engine is at running temp the rpm should drop back down to 750. Do all this with the engine running.

 

HTH mate :)

 

great info there pal! where do i read the voltage from? i cant seem to get any voltage from any pins?? theres 2 plugs off the TPS, one with 2 wires, and one with 3. which pins should i be reading form? many thanks!

Try this link mate.

http://z32.wikispaces.com/Throttle+Position+Sensor

cheers chap! rep for you :-)

cheers chap! rep for you :-)

 

where's mine!!!

 

 

 

:laugh:

repped up mo fo! lol