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1HZ Poor fuel economy
Moderators: toaddog, Elmo, DUDELUX
1HZ Poor fuel economy
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.
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.
;)
Re: 1HZ Poor fuel economy
Have you checked for leaks?
The worst part about being told you have Alzheimer's, is that it doesn't just happen once.
Re: 1HZ Poor fuel economy
Would be a big leak.
Nothing that obvious that would lead to that amount being used.
Nothing that obvious that would lead to that amount being used.
;)
Re: 1HZ Poor fuel economy
Did the change in fuel economy happen suddenly? Is it blowing black smoke?
Re: 1HZ Poor fuel economy
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.
;)
Re: 1HZ Poor fuel economy
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
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
Re: 1HZ Poor fuel economy
A good cheap start, change all your filters, check the intake/exhaust for a restriction.
The Silver Bullet - BJ74
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Re: 1HZ Poor fuel economy
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
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
2000 HZJ105 turbo with extras
Re: 1HZ Poor fuel economy
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
;)
Re: 1HZ Poor fuel economy
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
Kenny
Re: 1HZ Poor fuel economy
Sounds like time for a valve adjustment and injector pump service.
Valve adjustment is very important on these engines.
Valve adjustment is very important on these engines.
Re: 1HZ Poor fuel economy
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
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
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