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Kribside

By Kribside,
in General Maintenance

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123456 Proficient

123456

Posted
Posted

Hey, im having the same sort of problem as you, and no one else seems to get it (with the thumping). Cept mine happens when your at the lights with A/C on and head lights or brakes on. Can you set yuor car idling, turn your A/C and high beams on and check it in 3 or 4 minutes, see if its thumping please? I'm thinking my prob iss the alternator, maybe your turbo timer is sucking to much juice to?

Post back here if you check that, cheers

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Craved Grand Master

Craved

Posted
Posted
A TURBO TIMER DOES NOT USE ALOT OF POWER IT IS A TIMED RELAY

1.4 A just for having the timer plugged in -- 3 wires, worked perfect

thats ALOT more than a car should drian just sitting there, and this was just that unit.

so ease up

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RB SANDY Rising Star

RB SANDY

Posted
Posted

1.4 amps in a car is nothing the std alternator is about 80 amps If you are worried about that power you would not want to run a aftermarket fuel pump and also having the head lights on is taking at least 15 amps let alone having a big stereo.

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123456 Proficient

123456

Posted
Posted

ah, i meant as in, altenator is screwed, not as in whether its capable of it.

Just that mine only does it when i have lots of accessories on, and i've heard hicas can mess up if its not getting enough power. Also while i get this thump and im driving, on every thump noise the steering wheel jerks.

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InterCooL Rising Star

InterCooL

Posted
Posted (edited)

hey guys, i was able to go checkout kribside's car today and looks like to me that there is a hardline from the air condition pump (maybe?) that is visibly knocking backwards and forwards. i've gone around it here in MS Paint. so its fair dodgey. has anyone had experience with a problem like this? and is it part of the air conditioning? (no cars i've ever had have had a/c hah)

ac1.jpg

i could grab the hose but it wouldnt stop the knocking noise, couldnt work out exactly where it was coming from other than either the motor or the pipe hitting metal somewhere, but like i said, holding it wouldnt stop the noise

Edited by InterCooL
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dangtstr32 Apprentice

dangtstr32

Posted
Posted

Hi I have just joined this forum, it sounds like ur hicas is working when its not suppose to. On my car when i run a diagnostic mode for the hicas my back wheels thump and move about 1.5 degrees each way as the hicas light flashes. maybe there is something shorting ur relay coil(for ur hicas) wire to ur air conditioner some where. I would check to see if ur back wheels are turning and if they are, look under ur dash near the foot pedals and see if there are any splits in the cables under there. My cousin had the same problem but his hicas would kick in unexpectedly, so he left it but then later on melted a fuse and melted the fuse holder aswell, what was happening was he had a cut in a yellow insulated wire that must of been tapping on bare negative wires because car sparkys dont worry about taping ground wires as they can hit the car body and not short, but when u wrap it in a big coil and sit it next to a positive cable u will have problems. yeh so it must ve been tapping together not long enough to blow the fuse and just melted it. I taped it up and put it back in the coil it was in and he hasnt had a problem

Good Luck

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GreddyGo Rising Star

GreddyGo

Posted
Posted

Is your a hydraulic or electronic hicas system?

It looks hydraulic and that's some sort of pump/valve body for it!

That controlls the pressure etc. for the hicas system.

Correct me if i'm wrong.

Check to see if that whole assembly is tightly fastened to the chassis or where ever it mounts, maybe it's just lose.

Cheers

Josh

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Beer Baron Grand Master

Beer Baron

Posted
Posted

it's an altenator/battery problem. low voltage. Those lines are power steering/hicas line. When the voltage to the hicas drops you get that thumping noise. had the same problem in my 32 GTST. then after a while it started killing batteries. pulled out the altenator and got it rebuilt. never heard that thumping noise again.

check your altenator with the car idling. should be putting out around 13.8 volts. then put the car onto the turbo timer and see what it's putting out.

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ZENNON Grand Master

ZENNON

Posted
Posted (edited)
mm ok we'll have to look into that

but the noise is coming from the engine bay, not the back of the car

here is a better pic of the hose that jumps about, any ideas what it is actually for?

ac2.jpg

yeah thats definately the HICAS hey.... thats power stearing fluid... if you follow those lines to the front youll see they just do a loop at the front of the car in alloy (thats for cooling) and if you follow it towards the back of the car youll see it goes to behind the back diff where the controller is...

so for why its thumping... no idea...

Edited by ZENNON
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GreddyGo Rising Star

GreddyGo

Posted
Posted

I Agree with "Beer Baron"

Go to an Auto Elec and get your charging system and battery tested, unless you have the "right" tools at home to do it yourself!

I wouldn't want it to play up for to long as you might "burnout" or damage your hicas system.

And that rubber hose deos goto the front for cooling!

Cheers

Josh

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dangtstr32 Apprentice

dangtstr32

Posted
Posted

Interesting that

I would recommend running the diagnostic mode from this guy. http://www.skylinesaustralia.com/forums/in...icas+diagnostic

if this guy is to brief or is missing something i can help u out because i have a 'sky is the limit' manual which has it in it. it should say on his thread that different flash sequences mean different problems. this will test ur electronic side well and ull actually see the back wheels turning if its working properly. those thumping noises is pretty weird their must be a electronic valve closed somewhere or its blocked or something i really dont know, but if its a little seized and just needs to be free'd up the diagnostic mode will help it.

Good luck again

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dangtstr32 Apprentice

dangtstr32

Posted
Posted

sorry just read ur first remark about it doing it when the key is out and the turbo timer is on. This might mean that when the key is out the solenoids (electronic valves shut.) And i think the turbo timer is connected wrong also and would check the wiring of that with the wiring daigram for ur turbo timer.

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