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Randy Poffo
Newbie
Vic
Soarer V8 UZZ31

Posts: 1
Reg: 05-2016

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Friday, May 27, 2016 - 05:49 pm, by:  Randy Poffo (Macho_man) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hello first post and it's a bad one!

I have a 91 uzz31 and she's sick. I have a low idle problem which goes hand in hand with the charging system or something.

I had idle surging a while back.
No other issue, just idle surging, and high idle.
I recently cleaned and replaced bearings in Idle air control valve and upon reinstalling everything the car was idling at 400rpm.

The idle surge stopped, but it idled at 400rpm from then on.
Occasionally the idle would go back to a normal 700rpm every 2nd time the car was turned on.
It has surged twice in the past six months since cleaning the Idle Air thingo.

Sometimes revs are 700rpm, sometimes 400.
Car usually stalls upon starting if you don't touch the pedal, even with fuel pump ecu bypassed.
I can hear some kind of rumbling liquid sound in my back seat also sometimes... Sounds like it's inside the tank.

When the revs are below 700rpm, my headlights are dimmer, and the dash dims with each tick of the indicator (blinker) light.
The heater blows weak under 700rpm too.
All electrics go slower, seats, windows, if under 700rpm. If i place foot on the pedal and get revs to 800rpm, everything is fast again - works as it should.

I sit at the lights with my left foot on the brake and right foot on the pedal keeping the thing at around 900rpm usually...

I went to a battery tester and he said the battery failed the load test.
The car was idling at 400rpm at this stage (i didnt realize). I then idled it at 800rpm and he goes "OH hangon, nevermind... " -as if it passed.
And he turned it off and i forgot to ask if the battery is still fine, or what the story was.


I had an alternator no charging warning on the dash 3 months before I saw the battery guy, so changed it, and 2 weeks later so I replaced the alternator again.
I have the same low idle problem after 2 alternators. Could it be the battery?
Battery is testing 12.5v from memory.
The indicator is green, stays green for at least a week without being driven.
A couple of times it has been silver though.
I think this is from before i realized that the battery is draining if revs are not at 700rpm or higher.



I have a power steering fluid leak too, but it's from the container, not the pump itself; Mechanic said alternator should be fine.
I can't see where fluids leaking though, but am getting thick white/greyish smoke upon start ups at least once a week. I think it's power steering fluid being sucked into the engine...

On top of all the above, it seems that my acceleration either in neutral or 1st gear is slow. If I rev the car it seems to be struggling to redline. Takes 3 seconds instead of 1 second in neutral to go from 700rpm to 6200rpm.

The only error code this car is throwing is the error 63 for transmission.
As I understand, 63 is solenoid two which just means 2nd gear won't work properly.
It should not make 1st gear any less powerful.


What i'd like to know is, why is the car not charging properly at under 700rpm idle, what's causing the low idle most likely, and if anyone has a diagram of earth points, that would be really helpful!

Might just be a bad ground somewhere.
Last thing, does it matter what kind of battery terminals you use for the cable?
I took the Japanese style connectors off as they had melted basically, and put standard commodore things from supercheap on the ends of the cables.
The idle issue was happening before the terminal things were swapped from memory though.

Open to any suggestions!
Randy Poffo
Newbie
Vic
Soarer V8 UZZ31

Posts: 3
Reg: 05-2016

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Friday, May 27, 2016 - 06:08 pm, by:  Randy Poffo (Macho_man) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Oh something else i noticed this week.
Sometimes when i turn the car off, the steering wheel jerks to the left about 2 inches.
What would this be?
Mike Beck
Goo Roo
New Zealand
UZZ32 No.32 & JZZ31 3.0GT

Posts: 6044
Reg: 11-2005

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Monday, May 30, 2016 - 12:52 pm, by:  Mike Beck (Gold_40gt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi Randy,

This sounds a lot like ECU related problems.

The capacitors fail and leak causing varied issues with the EFI system.

I've fixed a lot of these computers with good results.

Have you had the car long / know of any ECU work done?
Roland Elliott
TryHard
New South Wales
uzz32 1uz-fe

Posts: 186
Reg: 08-2014

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Monday, May 30, 2016 - 09:52 pm, by:  Roland Elliott (Aussie2013) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Firstly the IAC is a step motor and from memory has 3 or 4 idle positions, some of these have presented with a field winding shorted and will not step the idle rate correctly, Secondly the Earthing points and the Positive wire connections should always be keep up to scratch , make sure you check the positive one on the alternator as well. By the sound of it you SHOULD replace the battery, probably easiest to go to an auto elec, and have them do a proper load test on the battery and alternator. There are many other things that can cause this problem so go over them one at a time, ECU, cold start sensor .....
Randy Poffo
Newbie
Vic
Soarer V8 UZZ31

Posts: 4
Reg: 05-2016

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Tuesday, May 31, 2016 - 06:06 pm, by:  Randy Poffo (Macho_man) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I'm leaning on the ECU being an issue too actually.
It says ECU OK on the TV screen though; Or did til it stopped working.
I have not seen my one yet but I might try take it out over the weekend.
I'll take some pics if successful.
I'd be interested in getting it repaired if damaged, and from what I can see on the net it looks fairly straightforward.
Similar to a computer motherboard.
I don't have solder tools though so won't be soldering anything.

Maybe I'll hit you up on that offer Mike, but i'd like to try find someone local first if the ECU is the prob.
What kind of costs are we looking at anyway?

I was thinking the coolant temp sensor for the ECU could be playing up too.
Could this cause a low idle, surging, and stalling?
Sometimes car stalls when driving. Seems to happen when coming to a stop usually (maybe brake lights causing spike with bad battery?), maybe once a week.
Usually within the first 10 minutes of taking off for the day.
Car instantly starts again while either stopped or still moving after being stalled.

When car stalls, it starts right back up, battery doesn't seem weak. Indicator is still green.
Connections seem tight.
Positive terminal post is DARK GREY however, was light grey. It's gotten blacker n blacker.
Strange.

So I'm worried that if I buy a new battery, the battery isn't actually the problem, and the problem is in the cabling or something instead.
So if I get a new battery, it'l just fry anyway.

Dilemmas.

I'll take pics of the ECU if I can get to it on the weekend and see what happens.
But with that coolant temp ecu sensor thing,
would that cause stalling and tardiness?
Seems fine at WOT (sometimes slower than i'd like almost as if there is fuel starvation or it's running on six instead of eight).

Could a battery which is testing fine at 12.5v be faulty, and cause any loss in engine power or miscommunication with sensors?

Something unrelated which might be related:
My passenger footlight stopped working.
Door chime stopped working.
Reverse beeper works 2 seconds after putting it in reverse (thought it should be instant).
Passenger mirror heater thing works, not drivers.
Passenger door keeps clicking (lock) til the drivers side door lock is locked.
Been like that since I got it... I assume a dodgy alarm installation at one stage.
TV seemingly unplugged. no power. black screen.
Oval muffler tip keeps changing direction clockwise. Silly muffler tips. Not even a bolt.
I don't want to say she's a bomb, but she's pushing her luck!

I'll be back over the weekend or earlier, thanks gents!

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