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Old 06-28-2019, 01:46 PM   #1
white89gt
 
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So.... how do you check the fuel pressure?

I think I might have low fuel pressure because my plugs has melted electrodes. I looked all over the engine compartment for a schrader valve, but I can't see one.

How the hell do you check FP on these things?
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Old 06-28-2019, 03:49 PM   #2
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You have to pull the hose off and use some assortment of hose and fittings to create a T off to a pressure gauge.

Did you check the short term and long term fuel trims in a scan tool?

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Old 06-28-2019, 09:08 PM   #3
white89gt
 
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Thanks for the reply. I did look at STFT and LTFT, and they were good.

I'm going to have to get creative with my FP gauge I guess. Not too sure why Toyota couldn't make it easy.
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Old 06-29-2019, 05:50 AM   #4
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Originally Posted by white89gt View Post
Thanks for the reply. I did look at STFT and LTFT, and they were good.

I'm going to have to get creative with my FP gauge I guess. Not too sure why Toyota couldn't make it easy.
Well i can understand US domestic brands having them because they have such poor build quality that the dealer techs will probably have to check the fuel pressure when the vehicle is under warranty.

The Yaris is built on a budget and how often do the fuel pumps or injectors go bad?

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Old 06-29-2019, 09:13 AM   #5
ex-x-fire
 
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Melted electrodes? You think you'd have some codes.
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Old 06-29-2019, 09:33 AM   #6
tmontague
 
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Quote:
Originally Posted by zoidberg444 View Post
Well i can understand US domestic brands having them because they have such poor build quality that the dealer techs will probably have to check the fuel pressure when the vehicle is under warranty.

The Yaris is built on a budget and how often do the fuel pumps or injectors go bad?

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This is true, but definitely frustrating for a diy'r when you want to rule out fuel issues. Fuel is rarely an issue with toyota engines, typically coil packs are tje cause of misfires in high mileage engines
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Old 06-29-2019, 10:56 AM   #7
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This is true, but definitely frustrating for a diy'r when you want to rule out fuel issues. Fuel is rarely an issue with toyota engines, typically coil packs are tje cause of misfires in high mileage engines
I saw it happen to my cousins Yaris. She had a 2SZ engined one. I'm not sure if it was a chicken or egg problem but she had coils 2 and 3 fail at the same time and i think new plugs as well at the dealer. I wondered what had gone bad first. Bad plugs damaging the coils or bad coils that fried the plugs?

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Old 07-01-2019, 09:38 AM   #8
white89gt
 
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Quote:
Originally Posted by zoidberg444 View Post
Well i can understand US domestic brands having them because they have such poor build quality that the dealer techs will probably have to check the fuel pressure when the vehicle is under warranty.

The Yaris is built on a budget and how often do the fuel pumps or injectors go bad?

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Say what you want about domestics, but at least you can repair them. I have had to do very little to this Yaris at 160K miles, but I can also say the same about my F150 with 260K on it. In fact, I've never had to check FP on the F150 - but I need to on the Yaris, so...

Quote:
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Melted electrodes? You think you'd have some codes.
I did, it had a cylinder 2 misfire. I had absolutely no signs whatsoever of it running differently until that point either. BUT, all four plugs looked the same - which is what I think it is running lean. Maybe the Denso plugs were not that good though... I put NGK's back in it.

I actually found a gauge that is supposed to allow you to disconnect the fuel line from the fuel rail, and then the gauge has connections to go between. Have to wait for it to get here though.
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Old 07-01-2019, 09:43 AM   #9
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Here are the plugs I pulled out... I put them in as 125,000 miles, and now it has just under 160,000.



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