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 Maybe tps issue?

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aurimas
Montanarolo
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aurimas


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PostSubject: Maybe tps issue?    Maybe tps issue?  Icon_minitime1Fri Apr 07, 2023 1:48 pm

Hello,

I had a chance to connect a carbtune. Left cylinder bar is inconsistent, goes up and down, right cilinder is OK? Any thoughts?
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Pete Roper
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PostSubject: Re: Maybe tps issue?    Maybe tps issue?  Icon_minitime1Fri Apr 07, 2023 5:15 pm

Is this at idle or at a constant higher engine speed?
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beetle
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PostSubject: Re: Maybe tps issue?    Maybe tps issue?  Icon_minitime1Fri Apr 07, 2023 5:19 pm


^^^^^^^^^^^^
This.


It's not the TPS.




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aurimas
Montanarolo
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aurimas


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PostSubject: Re: Maybe tps issue?    Maybe tps issue?  Icon_minitime1Fri Apr 07, 2023 10:04 pm

Pete Roper wrote:
Is this at idle or at a constant higher engine speed?
When the engine running on the idle.
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aurimas
Montanarolo
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aurimas


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PostSubject: Re: Maybe tps issue?    Maybe tps issue?  Icon_minitime1Fri Apr 07, 2023 10:04 pm

beetle wrote:

^^^^^^^^^^^^
This.


It's not the TPS.  



So what could it be? 🤔
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Pete Roper
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PostSubject: Re: Maybe tps issue?    Maybe tps issue?  Icon_minitime1Fri Apr 07, 2023 11:20 pm

At idle the manifold pressure changes quite radically as the engine cycles. Try damping the feed with some form of screw clamp on the hose to smooth it out.

If one side isn't doing it and one is I'd think it more likely you might have a poorly sealing valve. Run a compression test and then a leak down test and compare the results for both sides.
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aurimas
Montanarolo
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aurimas


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PostSubject: Re: Maybe tps issue?    Maybe tps issue?  Icon_minitime1Sat Apr 08, 2023 2:38 am

I do have a video, however I do know where to upload.
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lcjohnny
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PostSubject: Re: Maybe tps issue?    Maybe tps issue?  Icon_minitime1Sat Apr 08, 2023 3:35 am

The carb tune should have a restrictor valve on each pipe?
Little plastic connector with a screw or thumbscrew on the side.

If you open them both you will see both columns bouncing up and down as each piston sucks.
As you tighten them to restrict the air flow it damps the movement in the column.

Sounds like you have one side too loose
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aurimas
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aurimas


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PostSubject: Re: Maybe tps issue?    Maybe tps issue?  Icon_minitime1Sat Apr 08, 2023 4:01 am

lcjohnny wrote:
The carb tune should have a restrictor valve on each pipe?
Little plastic connector with a screw or thumbscrew on the side.

If you open them both you will see both columns bouncing up and down as each piston sucks.
As you tighten them to restrict the air flow it damps the movement in the column.

Sounds like you have one side too loose
I didn't know that, will have to look at this.
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Dean68uk
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PostSubject: Re: Maybe tps issue?    Maybe tps issue?  Icon_minitime1Sun Apr 16, 2023 1:53 am

connect both carbtune pipes one at a time to the same inlet to compare.
both columns should react the same.

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PostSubject: Re: Maybe tps issue?    Maybe tps issue?  Icon_minitime1

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