Surging 80 series Turbo Diesel

Submitted: Saturday, Jun 24, 2006 at 21:02
ThreadID: 35238 Views:4553 Replies:4 FollowUps:6
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I have a 1991 GXL 1HDT 80 Series Turbo Diesel, 5 Spd Manual, I am only new to the 4WD Scene, (Never owned one before). I have had my 4WD for around 12 months now and from the day I bought it, it has always surged. Only when the engine is cold. Once to operating temperature it no longer Surges. I have replaced fuel filters every 5000 KM's and this doesn't make a difference. Any helpful hints or advice would be appreciated. Other than the Surging I am very happy with the Rig.
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Reply By: ross - Sunday, Jun 25, 2006 at 15:49

Sunday, Jun 25, 2006 at 15:49
The turbo diesel has a temperature activated advance mechanism on the fuel pump.

It advances the pump timing when its cold to cut down on emmissions ect.
The hoses from the engine allow hot water to dissolve a wax pellet that realeases the advance mechanism lever when the engine is at operating temp.
The non turbo diesel doesnt have one and it can be safely removed and the cover from a 1HZ pump is used to cover the hole.

This may or may not have something to do with the surging but its the only thing I can think of that changes with the engine temperature.

AnswerID: 180270

Follow Up By: BBB - Sunday, Jun 25, 2006 at 17:01

Sunday, Jun 25, 2006 at 17:01
I am no mechanic but have a read of the CEM add on the home page of this sight they might be able to help you. They seem to get good rapes on this forum.

Good Luck

BBB

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FollowupID: 436528

Follow Up By: Alloy c/t - Sunday, Jun 25, 2006 at 17:44

Sunday, Jun 25, 2006 at 17:44
A wax pellet that dissolves to release the advance ,,must be school holidays ,?? LOL> I know its not April 1st.
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FollowupID: 436531

Follow Up By: ross - Monday, Jun 26, 2006 at 07:23

Monday, Jun 26, 2006 at 07:23
Before you make fun of someones post you should read the FSM .The wax pellet is called the "thermo wax".
This concept is also used to open/close the thermostats on many vehicles inc Fords ect
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FollowupID: 436596

Follow Up By: Alloy c/t - Monday, Jun 26, 2006 at 14:36

Monday, Jun 26, 2006 at 14:36
ross ,im not making "fun" of your reply ,, please satisfy our ignorance by supplying a part no /picture /and anything else such as tech specs for this wonderous "thermo wax" as fitted to a tojo turbo diesel and the same for a ford thermostat ,,, or at the very least where this mystical wax is exactly and how it is contained to be reused thousands of times ,,,, told you ,it is not April 1st.
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FollowupID: 436658

Follow Up By: ross - Monday, Jun 26, 2006 at 21:08

Monday, Jun 26, 2006 at 21:08
Your sarcasm makes you sound stupid.Normaly I wouldnt entertain you but as you cant use the search function on Google I have done it for you and you can spend your time reading all 16000+ refernces.

http://www.google.com.au/search?hl=en&safe=off&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=wax+pellet+thermostat&spell=1

The toyota fsm has a pic (one of many) and instructions on how to remove the thermowax from the fuel pump on pge FU33 of the 1PZ ,1HZ ,1HD-T
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FollowupID: 436735

Reply By: Kiwi Ray - Sunday, Jun 25, 2006 at 16:57

Sunday, Jun 25, 2006 at 16:57
Hi . You do not say when it surges, when you are driving it or when it is idling, if driving what revs?
AnswerID: 180276

Follow Up By: pres - Sunday, Jun 25, 2006 at 18:43

Sunday, Jun 25, 2006 at 18:43
It surges from cold 80 to 90kms at 2.8rpm whilst driving.
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FollowupID: 436544

Reply By: Alloy c/t - Sunday, Jun 25, 2006 at 17:53

Sunday, Jun 25, 2006 at 17:53
Start by cleaning the whole motor ,then get some CEM to clean the inside , new filters fuel / oil / air , check to see if any air leaks in the fuel and air systems ,, should be a steady idle @700rpm ,, had a similar surge at 260,000k develop ,did all the above ,have had no probs and now at 355,000k
AnswerID: 180280

Reply By: Kiwi Ray - Tuesday, Jun 27, 2006 at 08:19

Tuesday, Jun 27, 2006 at 08:19
Check that the water level sender unit has a new "O" and has an air tight seal.
This is fitted to the bottom of the fuel filter.
If you feel that the surge is in the warm up stage you can adjust the wax warm up unit out of the sequence to try and elliminate that from the circuit.
Check that there are not small air leaks in the small hoses from the inlet manifold / turbo to the injector pump
Also suggest you get the injector pump's internal pressure checked, this used to be a bit of a problem a few years ago.
AnswerID: 180533

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