Tuesday, July 16, 2013 - 10:43 am, by: Kush Chaudhary(1uz_hilux)
Hey guys,
So I've got a couple of issues with my 1UZ. First off, the 1UZ is in my Toyota Hilux 4x4.
The problems I am facing are poor and spontaneous idle and weird engine ticking noises that have only recently developed. I have searched and read through a number of threads in this forum and have tried some of the fixes people have mentioned.
The issue I'm having with my idle is that on first start of the day, it will only idle at roughly 400 RPM (doesn't matter if ambient temp is cold or warm) and sometimes it will stall straight after. On different occasions, it will startup and rev to 2400 then down to 400 then steady at 1100RPM. Once it's warm, it drives fine but has a notable ticking noise.
I have replaced the ECU water temp sensor with a genuine one from Toyota but that didn't do anything. Will be cleaning the throttle body today.
Tuesday, July 16, 2013 - 04:01 pm, by: Paul Drane(Paulwd)
are you using a stock ECU, idling problems could be caused by leaking caps in the ECU.
Remove the accessory belt run the at idle and see if the same noises are still there, if not that should point you in the right direction to start looking for the cause.
If they are the it could be noisy timing belt bearings, or water pump starting to fail, check your harmonic balancer as well.
Tuesday, July 16, 2013 - 04:58 pm, by: Kush Chaudhary(1uz_hilux)
Hi Paul, yes, using stock soarer ECU. Will check that out. I have cleaned the throttle body and the problem is still persistent. Original ticking noise started from inside the intake manifold and then another started from the lower LHS of the engine which is more of a knocking noise. The knocking noise gets faster and louder as the RPMs climb.
I'm going to take the whole IACV housing off tomorrow as my intake manifold has been flipped and there's no way I can get anything behind it to undo the screws.
Wednesday, July 17, 2013 - 01:17 pm, by: Kush Chaudhary(1uz_hilux)
Took the IACV off today and it was very dirty with a heap of build up. Cleaned it all up and re installed it. Started first go and didn't stall but was only idling at a bit over 500RPM when engine was cold. I'm not sure if the ECU will communicate with the IACV and it will fix itself the more I drive it or not?
Thursday, July 18, 2013 - 09:32 pm, by: Kush Chaudhary(1uz_hilux)
Replaced the bearings and now it starts without stalling but is still only revving at ~450-500 during cold start/first start of day. I haven't taken it for a drive but have started it maybe a handful of times. Do you think the ECU needs more time to work with the IACV?
Or should I wind the shaft out a bit more to make it rev higher?
Yeah when I inspected the throttle body, it looked really clean but will give it another clean tomorrow.
Friday, July 19, 2013 - 03:19 pm, by: Tom Richards(Tomr)
Did it idle correctly in the soarer before removal?Has it ever idled correctly in the hilux? did it stop idling correctly after you carried out some work ?
Saturday, July 27, 2013 - 12:18 am, by: Kush Chaudhary(1uz_hilux)
As far as I know, the motor was in top running condition when it was removed from the SC400. The idle was perfect for about 3 months after the install was done. Shortly after this period, the only major thing that I have carried out on the hilux is installing a long range fuel tank (130L)
Thinking about it now, ever since I've had that tank in, I've had problems with fuel supply to the motor and not having enough fuel pressure. This came down to a dodgey lift pump. I ended up putting in a brand new lift pump and bosch 044 pump.
I installed the new 044 today as the old one was playing up and I thought my idle was bad because of it but the new pump hasn't made any difference to idle. Some people say that it may be a bad fuel pressure regulator??
Car is undriveable at this stage as it will randomly stall when slowing down or sometimes when changing gears...
Saturday, July 27, 2013 - 07:55 am, by: Tom Richards(Tomr)
towards the back of the lhs bank(near the 1st- 2nd spark plug from the rear),there is a round cylinder with hoses going into it. Top centre you will see a philips head screw. when the ig is on, the fuel pressure will cause the screw to rise.
Saturday, July 27, 2013 - 11:32 pm, by: Kush Chaudhary(1uz_hilux)
The cylinder that is on the LHS bank has only 1 hose going to it from the manifold but there is no philips head screw in it? There's another cylinder on the front RHS on the fuel rail which has a phillips head screw in it and that one rises when ignition is on?
Friday, August 02, 2013 - 01:29 pm, by: Kush Chaudhary(1uz_hilux)
Anyone know where I could purchase a new fuel pressure regulator from? Toyota will need to back order from Japan and that will take about a month. I can get some from wreckers but would rather want a new one. Or is there an aftermarket one available somewhere??
Friday, September 13, 2013 - 09:01 am, by: Kush Chaudhary(1uz_hilux)
Just closing off this thread and thought I'd post how my idle issue was fixed.
There was no battery backup to ECU so idle motor didn't work properly.
Thanks to the incompetent auto leccy I had originally used. He was supposed to fix a battery drain and managed to completely stuff my wiring loom and relay. Moral of the story, take it to a specialist conversion auto leccy and don't let anyone who "thinks" they know what they're doing fix it. Cheers to everyone who pitched in with ideas!
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