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Old 12-13-2019, 06:27 PM   #1
joea99
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Default 06 Forester. 5 speed. Won't start unless . . .

Just picked up an 06. Previous owner said she always floored the accelerator pedal before cranking, old school carb style.

Though that odd, but now I find it will not fire up unless I do that. I can crank way, but until I press it to the floor, no fire.

TPS?
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Old 12-13-2019, 07:02 PM   #2
Blktrax
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Because itís flooding, flooring the accelerator performs a fuel cut.

Likely the air intake temp sensor has failed and thinks it -47F outside and dumping fuel to cold start.

Or someone has hacked in one of those dumb fuelsaver Janky crap cans into the IAT circuit.
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Old 12-13-2019, 07:36 PM   #3
joea99
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Quote:
Originally Posted by Blktrax View Post
Because itís flooding, flooring the accelerator performs a fuel cut.

Likely the air intake temp sensor has failed and thinks it -47F outside and dumping fuel to cold start.

Or someone has hacked in one of those dumb fuelsaver Janky crap cans into the IAT circuit.
I guess I can test the sensor.

What is "fuelsaver Janky crap can"? Search was not my friend.
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Old 12-13-2019, 08:18 PM   #4
joea99
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Quote:
Originally Posted by Blktrax View Post
Because itís flooding, flooring the accelerator performs a fuel cut.

Likely the air intake temp sensor has failed and thinks it -47F outside and dumping fuel to cold start.

Or someone has hacked in one of those dumb fuelsaver Janky crap cans into the IAT circuit.

Where is this AIT sensor located? Cannot find it called out? Integrated with MAF?
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Old 12-13-2019, 08:34 PM   #5
Blktrax
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Where is this AIT sensor located? Cannot find it called out? Integrated with MAF?
Yes, try swapping the sensor if you can.
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Old 12-14-2019, 12:14 PM   #6
joea99
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Originally Posted by Blktrax View Post
Yes, try swapping the sensor if you can.
Would cleaning the MAF have a chance of fixing it?
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Old 12-14-2019, 03:20 PM   #7
Blktrax
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You can try, wonít make it worse, but actually reading the data with a proper
Scan tool ďnot a code readerĒ and see what itís actually doing.
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Old 12-14-2019, 07:21 PM   #8
joea99
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Originally Posted by Blktrax View Post
You can try, wonít make it worse, but actually reading the data with a proper
Scan tool ďnot a code readerĒ and see what itís actually doing.
OK, so I am not sure I know the difference between a "code reader" and a "scan tool" is.

In any case today, a "warm start", sitting after a drive, I forgot about the pedal dance and it started without a problem. Of course today it is also above 40 F.

Also my code reader (?) says all monitors are ready and, no codes are there.

I am in the market, sort of, for a better tools as I need one that can talk about ABS codes, as this car also has the ABS light on.

I've had people say to get one with bluetooth and use a handheld device instead of a conventional tool.
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Old 12-14-2019, 09:01 PM   #9
turboblew
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Quote:
Originally Posted by joea99 View Post
...
I've had people say to get one with bluetooth and use a handheld device instead of a conventional tool.
They can be had for less than $10 off ebay. When hooked to Torque lite/pro you can read all kinds of interesting items and data log them too. Worth the $20 investment (app & ODBII plug)
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Old 12-14-2019, 11:10 PM   #10
2slofouru
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Like previously mentioned, the IAT sensor (inside the maf sensor?) could be sending an incorrect signal making the ecu think it's super cold and send too much fuel.

It's also possible one or more injectors are leaking and when you try and cold start, the addition of more fuel by the ecm is overloading the plugs so they can't spark, which necessitates you holding the pedal (disables fuel so the plugs can dry off). Have also read of an issue with a fuel pressure regulator sticking and holding too much pressure for idle and the ecu is programmed assuming a specific pressure. May not be the same on yours, but my 07 impreza has the returnless style regulator in the tank. It maintains the same pressure at all engine loads, so the ecu assumes and sends injector pulse accordingly.

You could connect a fuel pressure gauge up front and check pressure on a cold start before actually cranking it over, to check if it's leaked down super low. That could mean an injector leak. You can also check pressure once it's started to see if it's abnormally high.
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Old 12-15-2019, 11:22 AM   #11
joea99
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Quote:
Originally Posted by turboblew View Post
They can be had for less than $10 off ebay. When hooked to Torque lite/pro you can read all kinds of interesting items and data log them too. Worth the $20 investment (app & ODBII plug)
This sort of thing: https://www.ebay.com/itm/Bluetooth-F...ss!12484!US!-1

And that app will read ABS as well?
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