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Corolla 2011 poor fuel economy


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I bought a zre152r corolla and have been experiencing poor fuel economy with it, almost as high as 14.4l/100km as what the little screen reports. It is auto, and there are no error codes when scanned with an obd2 reader. I have noticed every now and then but definitely not often that when i'm stopped at lights the idle drops below 1000rpm and the car shudders for a bit. Aside from that acceleration is excellent and it takes off well. Large majority of my driving is within the suburbs and I don't even give it the beans.

 

When filling up to almost a fuel tank but still 2 bars below I get a tank distance of 302km which is abysmal for a corolla, I genuinely think my aurion is doing better on fuel than this thing is. What should I take a look at under the bonnet in regards to fixing this? I've disconnected the battery and let it sit for a day to "reset" but that really didnt do much. Tyres are at 36 psi and its recently had an oil change. All other fluids were flushed and at their max level.

 

Would appreciate any insight as to how I can get things fixed. Cheers

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5 hours ago, ozieagle said:

My first thought was a fuel leak. Cracked hose(s), after the pump, or weeping joins.

 

Herb

Cheers for the reply Herb, all the hoses in the engine bay and under the car are dry as can be, clamps are tight and no cracks. Haven't lifted the rear seats to check the pump, car never makes a smell either. Are there any notable readings I can look at with an obd2 reader to check if anything is not working right? I was thinking of cleaning the TB and running liqui moly gas system cleaner to see if that helps. I should add that its being run on 91 

Edited by schnoots144
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Hi John,

 

Sorry I can't answer specifics, as I'm a classic British car freak, and my answer was the sort of thing I would check in my cars.

 

With a Corolla I would expect a fuel economy less that 10l/100km

 

P.S. why I'm on this forum is that I have a 1995 Hi Ace camper.

 

Herb

Edited by ozieagle
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Have you pulled out the spark plugs to see if they have a story to tell?

What about a compression check?  Handbrake not binding?  Wheel bearings OK?

 

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My first thought would be to start with checking the air filter and determine whether it needs a cleaning or replacement. Next thoughts are to check/clean the MAF [mass airflow sensor] throttle body and the IAC [idle air control] valve.

This YouTube video may be of some assistance.

 

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2 hours ago, CB3109 said:

Have you pulled out the spark plugs to see if they have a story to tell?

What about a compression check?  Handbrake not binding?  Wheel bearings OK?

 

I'll check the plugs when I can, have yet to do that. Previous owner claimed to have changed them, handbrake is fine, wheel bearings dont grind and havent done a compression check (don't have the tool for it)

34 minutes ago, campbeam said:

My first thought would be to start with checking the air filter and determine whether it needs a cleaning or replacement. Next thoughts are to check/clean the MAF [mass airflow sensor] throttle body and the IAC [idle air control] valve.

This YouTube video may be of some assistance.

 

I followed this today and cleaned the TB while it was still in the car, it was extremely dirty inside and on the rim of the throttle plate but almost mirror clean on the outside, looked like a half ****d job. Didnt look at cleaning the IAC however, can it be pulled off the TB separately or do I have to take the whole TB off in order to get it off? Air filter is also not super dirty either has a date code of 2021 and is only slightly dark, MAF was cleaned a few weeks ago.

Next job is to look at the plugs, and run a test with what i've done so far

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