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GDI Intake valve deposits (Read 4,231 times)

drfuelinstein Freshman Member Offline I'm an Autonerd Posts: 1	GDI Intake valve deposits Oct 16^th, 2015 at 12:43pm Hello, I am another new guy to this forum. I am curious if anybody is considering ways to diagnose in a reliable way if there are deposits on Intake valves of GDI engines or even PFI engines? Is there a difference in vacuum signal or maybe as Tom Roberts suggested compression signal when deposits are on the intake valves? Thank you Mike
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Jamey

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Re: GDI Intake valve deposits
Reply #1 - Oct 19^th, 2015 at 10:26am

drfuelinstein wrote on Oct 16^th, 2015 at 12:43pm:

Hello,
I am another new guy to this forum. I am curious if anybody is considering ways to diagnose in a reliable way if there are deposits on Intake valves of GDI engines or even PFI engines? Is there a difference in vacuum signal or maybe as Tom Roberts suggested compression signal when deposits are on the intake valves?
Thank you
Mike

Welcome to the Nerdz Forums,

You may want to post in the Pico Scope help section, more eyes will see it there, as far as your question, I have not played around with a WPS or FLS on a known engine with GDI carbon issues, I do know that you can look at calculated load and fuel delivery to determine if there is a flow restriction.

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mikeadema Senior Member Picogroup Offline Posts: 232 Georgetown, Ontario Ontario Canada Gender:	Re: GDI Intake valve deposits Reply #2 - Oct 20^th, 2015 at 5:18pm In my experience, you will have a hard time determining deposits on intake valves unless it is only one cylinder affected. Usually all cylinders will bung up making it hard to pin point that they're bad. What you need to look at is overall air intake volume. The problem is that you need to know what good is first.
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fisher Super Nerd Picogroup Offline I love YaBB 1G - SP1! Posts: 2,734 Concord California USA Gender:	Re: GDI Intake valve deposits Reply #3 - Oct 21^st, 2015 at 9:08pm I once hooked up a scope to a stereo speaker and watched the waveforms of the voltage played as notes. Sound has a frequency; and the frequency of the intake manifold sound when clean must differ from that when it walls have a different shape, chemical constitution and size, as when coked and dirty.
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fisher Super Nerd Picogroup Offline I love YaBB 1G - SP1! Posts: 2,734 Concord California USA Gender:	Re: GDI Intake valve deposits Reply #4 - Oct 21^st, 2015 at 9:13pm So I wonder if a microphone in the intake might be useful?
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