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4A-FE fuel consumption q


ThePog
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My daughter tells me her Carib is using more fuel than expected, I seem to recall a recent discussion on OS about 4A-FE water temp sensor that if faulty will cause the ECU to dump more fuel in there. She seems to think having the heater on uses more fuel too but this seems unlikely, but there might be a link...

Any thoughts or advice?

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3 minutes ago, sidewaysickness said:

If check engine light isn't up, the obd check wont do shit unless you are using it to monitor real time outputs, like what is engine temp reading vs actual engine temp

What is the point of the OBD then? Just as I thought, a complete fucking waste of everyone's time.

I will ask her some temperature related questions but when i tested it after the cam belt change it seemed completely normal.

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I wouldn't go that far, Its not a waste of time if one is not a complete muppet when it comes to electronics, but like I said with the Dynafari wiring, It aint no thing but a chicken wing. 

If it is the ecu temp sensor thats faulty then the average driver will not know any difference, temp gauge may be reading correctly but (for example) ecu sensor isn't reading over 70c and needs to get to say 86c before switching to closed loop fueling

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24 minutes ago, sidewaysickness said:

I wouldn't go that far, Its not a waste of time if one is not a complete muppet when it comes to electronics, but like I said with the Dynafari wiring, It aint no thing but a chicken wing. 

If it is the ecu temp sensor thats faulty then the average driver will not know any difference, temp gauge may be reading correctly but (for example) ecu sensor isn't reading over 70c and needs to get to say 86c before switching to closed loop fueling

I might just chuck a new sensor in there for shits and giggs

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Its a old ECU on a lower spec car, newer ones have better systems to pick up a faulty sensor. A shitty O2 sensor also is a go for fuel usage on 4ages sometimes. You should be able to find a manual (they are bundled with the 4AG ones which exist on the net) and trouble shoot the various ECU things pretty easy, if you find a factory manual it will have some flow charts on what to check first for excessive fuel usage.

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6 minutes ago, sidewaysickness said:

Fucking hell! why are genuine BMW ones like $16? 

Toyota tax. It will get her into the groove for spending money on sensors every 5 minutes when she buys a newer car....

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10 hours ago, ThePog said:

What is the point of the OBD then? Just as I thought, a complete fucking waste of everyone's time.

I will ask her some temperature related questions but when i tested it after the cam belt change it seemed completely normal.

A 4AFE Carib wont be "OBD" it'll be toyotas old diagnostic protocol with a plug under the bonnet. You can short terminals and count flashes of the engine light to see if there are codes, otherwise there is/was an old diagnostic tool that Toyota might have that can give live data. Its nothing like OBD2 though.

If its a similar sensor to a Blacktop 4AGE this is the procedure for testing it.

 

Screen Shot 2021-05-24 at 7.06.52 PM.png

 

Im 2 for 2 on Corollas with buggered thermostats too. Comes up to temp when sitting, but real slow to come up when driving and will start to drop on the gauge as you drive. First one was stuck open, I'll bet this one is too.

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