Notice: We request that you don't just set up a new account at this time if you are a previous user.
If you used to be one of our moderators, please feel free to reach out to Chris via the facebook Outerlimits4x4 group and he will get you set back up with access should he need you.
Recovery:If you cannot access your old email address and don't remember your password, please click here to log a change of email address so you can do a password reset.

1HZ Poor fuel economy

Tech Talk for Cruiser owners.

Moderators: toaddog, Elmo, DUDELUX

Post Reply
Posts: 1889
Joined: Mon Sep 20, 2004 10:23 pm
Location: Brisbane

1HZ Poor fuel economy

Post by just cruizin' »

My 100 series has always got reasonable economy, about 600 - 700 from the main tank. Now it's dropped to only getting 400 very rapidly, I'm assuming it's injector related but would appreciate other suggestions.

Thus what's the best method to fix and how should be flushed/ cleaned / overhauled. Are there fuel additives worth using to clean the fuel system.
;)
Posts: 1383
Joined: Tue May 06, 2008 8:12 pm
Location: Newcastle

Re: 1HZ Poor fuel economy

Post by oldmate »

Have you checked for leaks?
The worst part about being told you have Alzheimer's, is that it doesn't just happen once.
Posts: 1889
Joined: Mon Sep 20, 2004 10:23 pm
Location: Brisbane

Re: 1HZ Poor fuel economy

Post by just cruizin' »

Would be a big leak.

Nothing that obvious that would lead to that amount being used.
;)
Posts: 40
Joined: Thu Jan 28, 2010 9:10 pm
Location: Sydney

Re: 1HZ Poor fuel economy

Post by samdumbert »

Did the change in fuel economy happen suddenly? Is it blowing black smoke?
Posts: 1889
Joined: Mon Sep 20, 2004 10:23 pm
Location: Brisbane

Re: 1HZ Poor fuel economy

Post by just cruizin' »

It's hard to tell as the vehicle doesn't normally do that many km's but I'd say yes, and it does blow more smoke then usual, I put that down to the overfuelling ie bad economy.
;)
Posts: 190
Joined: Mon May 12, 2008 11:54 am
Location: nsw

Re: 1HZ Poor fuel economy

Post by poppywhite »

Short runs arnt good for that motor they dont warm up much but depends on what you definiton of short run is.

Fill up with fresh diesel and use one of the injector clean additives chemtec/ nulon and go for few hundred k run.
Check for leaks along entire fuel system and check filter for tight. dont have to be big leak constant small adds up.

Let us know how you go
Posts: 1109
Joined: Mon Feb 12, 2007 8:48 pm
Location: Australia

Re: 1HZ Poor fuel economy

Post by hulsty »

A good cheap start, change all your filters, check the intake/exhaust for a restriction.
The Silver Bullet - BJ74
Where the actions at Ontrack 4wd Club
http://www.ontrack4wdclub.com/
[url]http://www.cams.com.au/[/url]
Posts: 549
Joined: Sat Jul 23, 2005 5:33 pm
Location: Sunshine Coast

Re: 1HZ Poor fuel economy

Post by Frankenyota »

How many km's? It's not uncommon for a 100 series 1HZ to need injectors doing at 100K.
Give it a service and change all filters as said.

Matt
'83 dual cab lux, v6 auto, duals, RUF, crossova steering, IFS rears, 35" MTRS
2000 HZJ105 turbo with extras
Posts: 1889
Joined: Mon Sep 20, 2004 10:23 pm
Location: Brisbane

Re: 1HZ Poor fuel economy

Post by just cruizin' »

New injectors And filters have been fitted fuel system I will double check tonight. I'll throw some fuel system cleaner through it. Has anyone used the CEM stuff before
;)
Posts: 35
Joined: Sat Nov 13, 2010 11:23 am

Re: 1HZ Poor fuel economy

Post by cruise75 »

Had similar problem with my hzj75. Changed the filter and used a bottle of wynns diesel conditioner in a full tank of fuel straight after. Fuel ecconomy picked up considerably. If you use the additive every 2nd tank it will benifit the injectors as well as your fuel pump. You can use it in every tank of fuel if you think their may be a blockage in an injector. It wont hurt the motor.
Kenny
Posts: 19
Joined: Sat Jun 05, 2010 9:32 pm
Location: Canberra

Re: 1HZ Poor fuel economy

Post by colinwhirlpool »

Sounds like time for a valve adjustment and injector pump service.

Valve adjustment is very important on these engines.
Posts: 2
Joined: Sun Mar 06, 2011 11:51 am

Re: 1HZ Poor fuel economy

Post by idh959 »

Hi Guys,

Whats the average cost of vavle adjustment on these. My mechanic is looking at the valave clearance, and decided some shims need to be replaced, at about $400 incl labour.

Cheers,
Ian
Post Reply

Who is online

Users browsing this forum: No registered users and 17 guests