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Planet-9

Rough Idle, Gas Pedal makes RPMs drop at first, Exhaust smells like gas/gun powder

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6 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHRough Idle, Gas Pedal makes RPMs drop at first, Exhaust smells like gas/gun powder

Reported or suspected cause

w/ oem parts or related

Suggestion or failed attempt

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
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 suspect a cause
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.

Suspected cause

It could be related to the fuel supply by what you describe but I don't know enough about the TPC unit to say whether the problem is w/ OEM parts or related to the TPC installation a/o parts.

Original post Read captured discussion
Rough Idle, Gas Pedal makes RPMs drop at first, Exhaust smells like gas/gun powder
Frequently discussed work

Clean maf several times in the past 6 months

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've cleaned the MAF several times in the past 6 months, but I'm wondering if it could be the problem, or if the TPS could be.

Original post Read captured discussion
Rough Idle, Gas Pedal makes RPMs drop at first, Exhaust smells like gas/gun powder
Read full discussion summary

Leading evidence: 'w/ oem parts or related' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'w/ oem parts or related' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Clean maf several times in the past 6 months' (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 · 6 captured posts examined · 1 partial discussions

Compare 2 other evidence results

Clean maf several times in the past 6 months

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've cleaned the MAF several times in the past 6 months, but I'm wondering if it could be the problem, or if the TPS could be.

Original post Read captured discussion
Rough Idle, Gas Pedal makes RPMs drop at first, Exhaust smells like gas/gun powder

Run good

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've sent the car to TPC Racing for troubleshooting but they found nothing and said the car was running good on the base file and didn't need any tuning, but its definitely seems too rich at low RPMs and the intermittently weird low-rpm bogging/jerking didn't seem bother them too much.

Original post Read captured discussion
Rough Idle, Gas Pedal makes RPMs drop at first, Exhaust smells like gas/gun powder
Frequently discussed actions (2)

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

Clean maf several times in the past 6 months

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've cleaned the MAF several times in the past 6 months, but I'm wondering if it could be the problem, or if the TPS could be.

Original post Read captured discussion
Rough Idle, Gas Pedal makes RPMs drop at first, Exhaust smells like gas/gun powder

Run good

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've sent the car to TPC Racing for troubleshooting but they found nothing and said the car was running good on the base file and didn't need any tuning, but its definitely seems too rich at low RPMs and the intermittently weird low-rpm bogging/jerking didn't seem bother them too much.

Original post Read captured discussion
Rough Idle, Gas Pedal makes RPMs drop at first, Exhaust smells like gas/gun powder
Reported and suspected causes (1)

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

w/ oem parts or related

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect a cause
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.

Suspected cause

It could be related to the fuel supply by what you describe but I don't know enough about the TPC unit to say whether the problem is w/ OEM parts or related to the TPC installation a/o parts.

Original post Read captured discussion
Rough Idle, Gas Pedal makes RPMs drop at first, Exhaust smells like gas/gun powder
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.

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

  • Planet-9: 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: 20261027T022239Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

Hi all, I hope at least one of you have had a similar experience and can possibly help! I have a 2006 911 Carrera S (manual tranny, supercharged by TPC Racing). It runs really strong and hard (440 rwhp, 350 ft-lb at 4000 rpm), but it's always been a little "punchy" / "boggy" / "hesitant" right off idle up to about 1750 rpm. When starting from a stop I usually have to rev it up to about 2000 rpm before engaging the clutch, otherwise the car bogs and jerks some until the rpms get above 1750 or so. *** But just last night I was pulling into the driveway and it began run rough, like it was trying to die on me. It would "diesel" on me a bit. Hitting the gas pedal some would make the rpms DROP about 200 or so before climbing up to where they should be. And the exhaust wreaked of hot gas, smelling almost like gun powder. No CEL though. Does anyone have any ideas on what might be causing this or what I could check? Thanks for any help, I appreciate it! Cliff

POST 2Original post

You may want to begin by consulting with the installer of the TPC unit to see if that may have any bearing on your problem. It could be related to the fuel supply by what you describe but I don't know enough about the TPC unit to say whether the problem is w/ OEM parts or related to the TPC installation a/o parts.

POST 4Original post

Thanks, Dave and Late Apex. After shutting the car off and waiting a day, I restarted it and it's no longer idling rough. The culprit will probably rear its ugly head again some day. I've cleaned the MAF several times in the past 6 months, but I'm wondering if it could be the problem, or if the TPS could be. I've ordered the Durametric Tool so I can do some logging before I take it to the dealership or discuss it with TPC Racing again. I've sent the car to TPC Racing for troubleshooting but they found nothing and said the car was running good on the base file and didn't need any tuning, but its definitely seems too rich at low RPMs and the intermittently weird low-rpm bogging/jerking didn't seem bother them too much. I'm looking for a tuning shop in the DFW area now...they're my only hope I think. Thanks again, Cliff

POST 5Original post

Cliff, From what I understood you may be having and electrical problem not tuning, the delay is related to the engine and not the tune, if the car is running rough you could have spark plugs that do not seem strong enough to match the tune, or you could have a faulty injector.

POST 6Original post

You're right. For some reason, there was a 987 Mass Air Sensor in my 997.

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