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12Ht Surge

Tech Talk for Cruiser owners.

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Posts: 108
Joined: Mon Oct 17, 2005 10:32 am
Location: Flinders Rangers - South Australia

12Ht Surge

Post by ellard »

Hi there

I am after some advice/direction from the forum.

I have recently bought an old 1986 12ht 60 wagon - and I am having a problem which I am am unable to explain.

When driving the vehicle at idle (4wd or 2wd) it seems to want to surge (bunny hopping) - could it be the idle is set to low or is it a throttle issue?

What RPM should these be set to?

Thanks in advance

Wayne
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Posts: 750
Joined: Fri Oct 17, 2003 9:07 pm
Location: Albury

Contact:
Contact MUD000

Post by MUD000 »

Put bigger tyres on it
It'll obsorb the tourqyness out of the motor
You will learn to drive it I did
I run 32 arount town & 35's in the bush & its so much better to drive on 35's
Cheers Dan
06 Dual Cab Hilux Loaded with ARB
80 Series With L98 6ltr 35's 4L80E Locked & Loaded
84 Extra Cab Hilux Build up fun car
96 Dual Cab Hilux build up Long range play car
www.trailtrack4x4.com
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Posts: 5179
Joined: Fri Dec 05, 2003 8:15 pm
Location: Brisbane Australia

Post by Shadow »

its not a problem, just something you have to learn to get used to

The 2H's do it a bit too. You need very fine throtle control. When you hit a buimb your foot is bouncing just that little bit which is causing the bunnyhopping.

Some people put a block of foam under the throttle when doing the more delicate 4wding.
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Joined: Tue Aug 12, 2003 6:50 pm
Location: wollongong

Post by dow50r »

Heres some sort of explanation for you...i dont know if the 12ht pump does this like the hdft does...at idle, the pump governs itself....if the motor idles lower, the pump compensates...and adds fuel..then when it gets up to idle it removes it...and you kangaroo up the road :)
Dont let it happen...at this speed, you have lots of mechanical forces and not much oil...big ends suffer.
Andrew
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Posts: 108
Joined: Mon Oct 17, 2005 10:32 am
Location: Flinders Rangers - South Australia

Post by ellard »

Hi there all

First of all many thanks for the explanation.

I suspected it could have been me and my driving habits (as I havent had it for all that long)

It just sound like the excuss I need to get off road a little more often to get familiar with the truck.

Many thanks again

Wayne
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Posts: 218
Joined: Tue Jan 16, 2007 9:28 pm

Post by tuffsahara »

yeah same with mine its wayy touchy i got used to it also if it bounces when it idles the govener needs to be adjusted the old man did it on mine and fixed the problem :armsup:
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Posts: 106
Joined: Wed Dec 28, 2005 4:22 pm
Location: Tamworth

Post by beavis »

try putting a heavier spring on the throttle cable on the pump, or an additional spring. You will also reincounter this problem when you decide to pump some more air into it
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Posts: 549
Joined: Sat Jul 23, 2005 5:33 pm
Location: Sunshine Coast

Post by Frankenyota »

Did some injectors in a 60 series with a 12ht.
When i test drove it the throttle was very touchy, causing kangarooing if you didn't ease the pedal.
Asked our diesel repair mob and they said that it's a sign of the governer in the injector pump was worn.
Which mean't big dollars to overhaul :cry:

Glad i have a hilux.

Matt
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