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Old 02-02-2017, 07:40 PM   #1
Barberdisco1
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Default Code chasing

So I've been chasing codes and now they are all gone, I've replaced crank sensor,cam sensor,fuel temp sensor, fuel pump, all 4 o2 sensors,water sensor, and I'm still getting a hesitation and misfire at about 35 MPH. I'm at a loss any suggestions would be nice I'm looking into replacing vss.
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Old 02-02-2017, 07:44 PM   #2
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Default Re: Code chasing

The vss usually doesn't act up and cause this until your going over 70.

Last edited by discostew; 02-06-2017 at 07:42 AM.
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Old 02-02-2017, 09:11 PM   #3
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Default Re: Code chasing

Any ideas then?I'm going to try aND pull more codes then I guess
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Old 02-02-2017, 09:14 PM   #4
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Default Re: Code chasing

Soon as I give it some juice it jumps and shudders misfires
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Old 02-02-2017, 10:25 PM   #5
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Default Re: Code chasing

Quote:
Originally Posted by Barberdisco1 View Post
Soon as I give it some juice it jumps and shudders misfires
What is juice?
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Old 02-02-2017, 10:31 PM   #6
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Default Re: Code chasing

Fuel/petrol/suds/ go juice
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Old 02-02-2017, 11:09 PM   #7
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Default Re: Code chasing

Have you checked your throttle position sensor?
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Old 02-02-2017, 11:26 PM   #8
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Default Re: Code chasing

4Runner is probably on to something here. But don't just go buy a sensor. If you don't have a scanner measure the voltage at the three wires of your TPS. I'm betting that your 5 volt reference voltage for the TPS is being pulled low by your fuel tank pressure sensor. If you just want to cut right to the chase go back to the fuel pump and disconnect the fuel tank pressure sensor and see how it runs.

Do that before you do anything else. I really doubt your TPS failed, it's probably the fuel tank pressure sensor.
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Old 02-02-2017, 11:46 PM   #9
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Default Re: Code chasing

So I went out tonight drove 30 miles it jumped sputter d an misfires whole way no check engine light, ran 15 miles with scanner in ran 15 miles without no codes#
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Old 02-03-2017, 08:06 AM   #10
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Default Re: Code chasing

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Originally Posted by discostew View Post
4Runner is probably on to something here. But don't just go buy a sensor. If you don't have a scanner measure the voltage at the three wires of your TPS. I'm betting that your 5 volt reference voltage for the TPS is being pulled low by your fuel tank pressure sensor. If you just want to cut right to the chase go back to the fuel pump and disconnect the fuel tank pressure sensor and see how it runs.

Do that before you do anything else. I really doubt your TPS failed, it's probably the fuel tank pressure sensor.
What is the TPS voltage on the scanner? It's possible the problem I'm talking about won't store a code.
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Old 02-03-2017, 08:43 AM   #11
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Default Re: Code chasing

It's an Ael system if that helps.
And fuel tank pressure sensor must be one of the plug ins on top of fuel tank. I'll report back toda
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Old 02-03-2017, 09:05 AM   #12
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Default Re: Code chasing

It's the flat one. I'm willing to bet money this is your problem.
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Old 02-03-2017, 10:04 AM   #13
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Default Re: Code chasing

So if it is bad what is next step replace whole fuel filter or replace the plug
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Old 02-03-2017, 10:48 AM   #14
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Default Re: Code chasing

If you don't have to take emission test. Leave it unplugged and deal with the light. Or buy a $800 pump assembly.
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Old 02-03-2017, 11:00 AM   #15
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Default Re: Code chasing

800 $ thet are about 350 to 400$ I'll unplug it and give it a go I'll tell you later how it works
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Old 02-03-2017, 11:04 AM   #16
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Default Re: Code chasing

http://www.roverparts.com/nxt/?keywo...on=Discovery+I
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Old 02-05-2017, 10:13 AM   #17
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Default Re: Code chasing

So I have unplugged brownish red plug didn't change vehicle issues ,unplugged little black hose nothing, throttle sensor maybe? I'm going mad lol
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Old 02-05-2017, 10:29 AM   #18
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Default Re: Code chasing

Quote:
Originally Posted by Barberdisco1 View Post
So I have unplugged brownish red plug didn't change vehicle issues ,unplugged little black hose nothing, throttle sensor maybe? I'm going mad lol
You never told us what kind of fuel pressure you have or what the TPS voltage is on your scanner.
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Old 02-05-2017, 03:42 PM   #19
Barberdisco1
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Default Re: Code chasing

35,36,37 psi not sure about voltage
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Old 02-15-2017, 10:33 AM   #20
Barberdisco1
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Default Re: Code chasing

So thank you everyone for the ideas ,I found the issue it was a broken wire near fuel tank I'm guessing it was making some sort of connection then cutting out ,it to me longer to check it because of work and crappy weather, so ty again
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Old 02-15-2017, 10:33 AM   #21
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Default Re: Code chasing

Now on to cruise control woohoo
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