Landcruiser 1HDT surging

Submitted: Sunday, Jul 11, 2010 at 16:37
ThreadID: 79995 Views:5066 Replies:6 FollowUps:6
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I'm planing to take the 80 series down to United diesel this week or next, but thought i'd check some opinions first.
At about, (very consistantly) 2400 rpm the cruiser has a terrible surge, as if it's about to run out of fuel, or more so, has run out of fuel. Power on, and it pulls out of the surging, so it's only under cruising that it happens, mostly evident in 5th as this is 100 odd cruising speed.
I've had the injector pump done by united about a year ago, and just serviced the cruiser too, was hoping as the service was overdue, this may have fixed it.

So any ideas?

Cheers again

Troy
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Reply By: Cruiser .- Sunday, Jul 11, 2010 at 17:42

Sunday, Jul 11, 2010 at 17:42
Troy,

Had the same problem with my 80 when I had it and after much looking and head scratching (amongst other areas), it turned out to be a faulty earth in the right rear tail light believe it or not.

Hope this helps in some way,

Cheers,

Cruiser
AnswerID: 423668

Follow Up By: Member - troy s (WA) - Sunday, Jul 11, 2010 at 20:12

Sunday, Jul 11, 2010 at 20:12
Hi Cruiser, So how did you narrow it down to an earth problem, and how did you then find it at the tail lights?
And why does this cause the problem then??

cheers
Troy
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FollowupID: 694149

Follow Up By: Cruiser .- Sunday, Jul 11, 2010 at 20:34

Sunday, Jul 11, 2010 at 20:34
Troy,

Finding out it was an earth problem was an accident really

I had been having problems with the tail light cluster (kept blowing bulbs but not fuses) and when we finally decided to replace it we found the loose earth (we were not aware this was going to resolve 2 problems).

When we had finally finished fitting a new tail light cluster, it was obvious straight away that the other problem was fixed.

I am not an auto electrician so don't fully understand it, but it seems that the tail light circuit shared a common earth with the circuit that controlled something on the pump for the fuel control.

Maybe someone else can shed some light on it

Cheers,

Cruiser
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FollowupID: 694154

Reply By: TerraFirma - Sunday, Jul 11, 2010 at 19:42

Sunday, Jul 11, 2010 at 19:42
Did you say just had it serviced.? Just trying to isolate the possibilities? 9 times out of ten diesel issues are fuel or air related, they are the 2 fundamentals.
AnswerID: 423680

Follow Up By: Member - troy s (WA) - Sunday, Jul 11, 2010 at 20:14

Sunday, Jul 11, 2010 at 20:14
Yeah thats what I felt too, was thinking it may have been a blocked fuel filter, had this on the 60 series, but not so consistant.
Just done a basic service myself, so just oils and filters.

troy
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FollowupID: 694150

Reply By: brissle - Sunday, Jul 11, 2010 at 21:06

Sunday, Jul 11, 2010 at 21:06
may be an earth , but try checking the main body earth near the battery sometimes this can give similar problems to what you have, but usually when trying to turn off the engine, worth a look
AnswerID: 423699

Follow Up By: Member - troy s (WA) - Monday, Jul 12, 2010 at 07:56

Monday, Jul 12, 2010 at 07:56
Cheers, as soon as this weather buggers off, i'll get out and have a look at the earth's
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FollowupID: 694186

Reply By: hotfishez - Sunday, Jul 11, 2010 at 22:48

Sunday, Jul 11, 2010 at 22:48
replace the fuel filter.....
AnswerID: 423714

Follow Up By: Member - troy s (WA) - Monday, Jul 12, 2010 at 07:55

Monday, Jul 12, 2010 at 07:55
As above, replaced all the filters.
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FollowupID: 694185

Reply By: Sea-Dog - Monday, Jul 12, 2010 at 09:03

Monday, Jul 12, 2010 at 09:03
Check the rubber inlet pipes on the air intake to make sure that they are not collapsing under the load of the intake air... this is relatively common and will restrict the air flow to the point where the car will struggle for power until it returns again.
AnswerID: 423744

Follow Up By: Member - troy s (WA) - Monday, Jul 12, 2010 at 20:06

Monday, Jul 12, 2010 at 20:06
Thanks will have a look at that too, thing is, lack of power is not an issue. Even while surging, it will power up instantly if you push the pedal, no lag or lack of resonse. Only surges while not under load.
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FollowupID: 694280

Reply By: Member - Graham H (QLD) - Tuesday, Jul 13, 2010 at 13:57

Tuesday, Jul 13, 2010 at 13:57
There is a thread about the opposite effect on 4wd Action Diesel tech ATM

Seems there was a mod on fuel pumps on these and a spring wears and causes probs.

Perhaps a look there or on LCOOL would be the go


AnswerID: 423893

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