1UZ idle!

[Big_Lux]

Been having some issues for a while now with my 1UZ (UZZ31) hilux. It has stopped idling properly and is a pain to start. The first start of the day, it will barely idle and usually stalls. Some days it will start and idle fine at 1200RPM and next day, nothing. I can't drive it, as everytime I brake or slow down, the idle will drop severely and it stalls..

Have done the following to try and find the problem:

Cleaned/Rebuilt IACV
Cleaned throttle body
New fuel pumps (lift pump and Bosch 044)
Water temp sensor
Checked for vacuum leaks
Checked ECU for leaking caps

Was listening to the motor and there is a hissing sound coming from the fuel pressure regulator. When the vacuum hose is removed from the FPR, the idle increases a lot.There is no fuel getting into the hose from the FPR.

Where can I purchase a new FPR from? Toyota will have to order from Japan and that will take weeks. Is there an aftermarket one that will bolt in?

 

[Zuffen]

Post up a Wanted to Buy add on this Forum.

These are common as and lots are replaced when people go to Forced Induction.

Plus plenty of motors get parted out.

To make it easier check this Thread. http://www.lextreme.com/forums/showthread.php?t=15875

 

[hiluxfan]

Hi!
Before you go to all the trouble of changing the FPR, just hook up a temporary gauge and check the actual fuel pressure. All FPRs do make some kind of sound and yours may be normal.

 

[Big_Lux]

Thanks for the link Zuffen.
Hiluxfan: How do I hook a gauge up? Is there a port or valve on the rail that I can attach a fuel pressure gauge onto?

 

[hiluxfan]

If you have the aluminum rails there is a blanking bolt on the front side. Otherwise you an also remove the damping unit and replace it with a normal banjo bolt that has been drilled and tapped to make provision for connecting a gauge.
These pics are from my 3UZ but should give you an idea of what to look for.