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PSE issue with change-over valve

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2 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHPSE issue with change-over valve

Leading reported evidence

Replace change-over valve #2

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster

The diode cut modified and I replaced the change-over valve #2.

Original post Read captured discussion
PSE issue with change-over valve
Frequently discussed work

Disconnect changeover valve

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

I think your problem sounds more electronic, the default setting on the PSE I.e with no vacuum is for the flaps to be open so with no vacuum if you disconnect the changeover valve , this is why it's always open or loud, don't leave it disconnected as that side of the vacuum circuit also feeds the resonator flap on the inlet manifold which helps with low end throttle response , that is what #1 actuator is , it's nothing to do with the exhaust , if the switch has been flickering could it simply be a faulty switch, I'd start there first!

Original post Read captured discussion
PSE issue with change-over valve
Read full discussion summary

Leading evidence: 'Replace change-over valve #2' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Disconnect changeover valve' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

Read captured replies

1 matching discussions · 2 captured posts examined · 0 partial discussions

Compare 4 other evidence results

Disconnect changeover valve

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

I think your problem sounds more electronic, the default setting on the PSE I.e with no vacuum is for the flaps to be open so with no vacuum if you disconnect the changeover valve , this is why it's always open or loud, don't leave it disconnected as that side of the vacuum circuit also feeds the resonator flap on the inlet manifold which helps with low end throttle response , that is what #1 actuator is , it's nothing to do with the exhaust , if the switch has been flickering could it simply be a faulty switch, I'd start there first!

Original post Read captured discussion
PSE issue with change-over valve

Disconnect pse mode is always

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

If the change-over valve #2 on the diagram is disconnected the PSE mode is always ON (loud) as expected.

Original post Read captured discussion
PSE issue with change-over valve

Replace change-over valve #1 or relay

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

Do I need to change the change-over valve #1 or relay?

Original post Read captured discussion
PSE issue with change-over valve

Set on the pse i.e

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

I think your problem sounds more electronic, the default setting on the PSE I.e with no vacuum is for the flaps to be open so with no vacuum if you disconnect the changeover valve , this is why it's always open or loud, don't leave it disconnected as that side of the vacuum circuit also feeds the resonator flap on the inlet manifold which helps with low end throttle response , that is what #1 actuator is , it's nothing to do with the exhaust , if the switch has been flickering could it simply be a faulty switch, I'd start there first!

Original post Read captured discussion
PSE issue with change-over valve
Frequently discussed actions (5)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Disconnect changeover valve

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

I think your problem sounds more electronic, the default setting on the PSE I.e with no vacuum is for the flaps to be open so with no vacuum if you disconnect the changeover valve , this is why it's always open or loud, don't leave it disconnected as that side of the vacuum circuit also feeds the resonator flap on the inlet manifold which helps with low end throttle response , that is what #1 actuator is , it's nothing to do with the exhaust , if the switch has been flickering could it simply be a faulty switch, I'd start there first!

Original post Read captured discussion
PSE issue with change-over valve

Disconnect pse mode is always

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

If the change-over valve #2 on the diagram is disconnected the PSE mode is always ON (loud) as expected.

Original post Read captured discussion
PSE issue with change-over valve

Replace change-over valve #1 or relay

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

Do I need to change the change-over valve #1 or relay?

Original post Read captured discussion
PSE issue with change-over valve

Replace change-over valve #2

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster

The diode cut modified and I replaced the change-over valve #2.

Original post Read captured discussion
PSE issue with change-over valve

Set on the pse i.e

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

I think your problem sounds more electronic, the default setting on the PSE I.e with no vacuum is for the flaps to be open so with no vacuum if you disconnect the changeover valve , this is why it's always open or loud, don't leave it disconnected as that side of the vacuum circuit also feeds the resonator flap on the inlet manifold which helps with low end throttle response , that is what #1 actuator is , it's nothing to do with the exhaust , if the switch has been flickering could it simply be a faulty switch, I'd start there first!

Original post Read captured discussion
PSE issue with change-over valve
Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

2 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261027T070717Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Sometimes, the PSE ON/OFF button's light is flicking when engine starts or push the button. Sometimes, PSE mode is ON (loud) even the button light is ON. Sometimes, PSE works well with the button ON/OFF. Sometimes, PSE mode is always OFF (quiet) with light ON and the button doesn't respond at all. If the change-over valve #2 on the diagram is disconnected the PSE mode is always ON (loud) as expected. The diode cut modified and I replaced the change-over valve #2. Do I need to change the change-over valve #1 or relay? Hopefully someone can help me. 996 vacuum line

POST 2Original post

Danny way I think your problem sounds more electronic, the default setting on the PSE I.e with no vacuum is for the flaps to be open so with no vacuum if you disconnect the changeover valve , this is why it's always open or loud, don't leave it disconnected as that side of the vacuum circuit also feeds the resonator flap on the inlet manifold which helps with low end throttle response , that is what #1 actuator is , it's nothing to do with the exhaust , if the switch has been flickering could it simply be a faulty switch, I'd start there first!

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