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Planet-9

"Limp Mode" Loss of power over 4000 rpm's

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

Discussion summary

YOUR RESEARCH"Limp Mode" Loss of power over 4000 rpm's

Reported repair

Replace fabspeed headers

Reported resolution
1
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 report a fix
1

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

Reported fix

I had the Fabspeed headers with catalysts removed and replaced them with OEM headers. Problem was solved.

Original post Read captured discussion
"Limp Mode" Loss of power over 4000 rpm's
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Leading evidence: 'Replace fabspeed headers' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, the most frequently mentioned possible cause is 'essentially' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Replace fabspeed headers' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Replace fabspeed headers', supported by resolution reports in 1 discussions. 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.

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1 matching discussions · 10 captured posts examined · 1 partial discussions

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essentially

Reported cause

No successful repair reported for this finding.

1
Identified cause
0
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 report identifying 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.

Reported cause

I cleaned it and the intake components up to the throttle body and the problem was essentially solved!

Original post Read captured discussion
"Limp Mode" Loss of power over 4000 rpm's

oil soaked maf sensor

Reported cause

No successful repair reported for this finding.

1
Identified cause
0
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 report identifying 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.

Reported cause

The main issue with mine turned out to be an oil soaked MAF sensor!

Original post Read captured discussion
"Limp Mode" Loss of power over 4000 rpm's

Clean maf and still same problem

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

i cleaned my maf and still same problem....

Original post Read captured discussion
"Limp Mode" Loss of power over 4000 rpm's

Install softronic plenum

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

The problem actually came up about 400-500 miles after I had installed the Softronic Plenum, for some reason the oil wants leak beyond the throttle body and run down the silicone elbow and collect near the MAF, which hadn't happened with my stock plenum after 12,000 miles of driving.

Original post Read captured discussion
"Limp Mode" Loss of power over 4000 rpm's
Frequently discussed actions (7)

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

Replace fabspeed headers

1
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that report a fix
1

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

Reported fix

I had the Fabspeed headers with catalysts removed and replaced them with OEM headers. Problem was solved.

Original post Read captured discussion
"Limp Mode" Loss of power over 4000 rpm's

Clean maf and still same problem

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

i cleaned my maf and still same problem....

Original post Read captured discussion
"Limp Mode" Loss of power over 4000 rpm's

Clean maf sensor at the same time

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

Since I change my air filter every 10,000 miles I just plan to routinely clean the MAF sensor at the same time.

Original post Read captured discussion
"Limp Mode" Loss of power over 4000 rpm's

Install softronic plenum

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

The problem actually came up about 400-500 miles after I had installed the Softronic Plenum, for some reason the oil wants leak beyond the throttle body and run down the silicone elbow and collect near the MAF, which hadn't happened with my stock plenum after 12,000 miles of driving.

Original post Read captured discussion
"Limp Mode" Loss of power over 4000 rpm's

Replace air filter every 10,000 miles i just plan

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

Since I change my air filter every 10,000 miles I just plan to routinely clean the MAF sensor at the same time.

Original post Read captured discussion
"Limp Mode" Loss of power over 4000 rpm's

Run engine

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 did figure out that running the engine with about 3/4 of a quart less oil helps alot, and its been about 5000 miles since the last cleaning.

Original post Read captured discussion
"Limp Mode" Loss of power over 4000 rpm's

Use stock air filter as well

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

I use a stock air filter as well.

Original post Read captured discussion
"Limp Mode" Loss of power over 4000 rpm's
Reported and suspected causes (2)

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

essentially

No successful repair reported for this finding.

1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that report identifying 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.

Reported cause

I cleaned it and the intake components up to the throttle body and the problem was essentially solved!

Original post Read captured discussion
"Limp Mode" Loss of power over 4000 rpm's

oil soaked maf sensor

No successful repair reported for this finding.

1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that report identifying 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.

Reported cause

The main issue with mine turned out to be an oil soaked MAF sensor!

Original post Read captured discussion
"Limp Mode" Loss of power over 4000 rpm's
Actions with reported resolution accounts (1)

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

Replace fabspeed headers

1
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that report a fix
1

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

Reported fix

I had the Fabspeed headers with catalysts removed and replaced them with OEM headers. Problem was solved.

Original post Read captured discussion
"Limp Mode" Loss of power over 4000 rpm's
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.

10 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: 20261026T113718Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

Has anyone experienced a decrease in power including engine misfiring at about 3500-4000 rpms?? I currently have Fabspeed 200 cell cats (3000 miles), a Borla catback system and The Softronic Plenum. About 2 weeks ago in anticipation of my 20,000 mile service I re flashed the software to original. About 2 days later a backfire caused the check engine light to come on. The engine ran fine for about another week but over the last 2-3 days I cannot get over 4000 rpm's, any attempt to do so causes misfiring. I was thinking that this was the ECU protecting itself for having the CEL on for an extended time. I'm hoping the cats are OK as I don't want to go to the expense or hassle of removing them and exchanging. I was suspecting this may be a bad ignition coil on one of the plugs as well... A few days ago I ordered the Durametric software and am still waiting to get it. If anyone out there has experience this please chime in and thanks!

POST 2Original post

This is important stuff, too important to be applying guess work. I'd get it into the dealership, or at the very least get more info out of the DME with the Durametrics software before you drive any more.

POST 3Original post

what was the cause? my car is doing this too......i have the borla, SRP and flash 4.

POST 4Original post

I had the exact same problem. I had the Fabspeed headers with catalysts removed and replaced them with OEM headers. Problem was solved. On examination, the cats in the Fabspeed headers were broken. They have since replaced them under warranty. I had them put back on. So far no problems.

POST 5Original post

The main issue with mine turned out to be an oil soaked MAF sensor! I cleaned it and the intake components up to the throttle body and the problem was essentially solved!

POST 6Original post

Question for you. What type of air filter are you using?

POST 7Original post

And how was said air filter installed? If I follow GB's reasoning, you may have missed a critical installation note on the K&N, EVO and alike high flow air filters. To avoid MAF failures due to oil, you have to blow the excess oil off of them with an air compressor.

POST 9Original post

I use a stock air filter as well. The problem actually came up about 400-500 miles after I had installed the Softronic Plenum, for some reason the oil wants leak beyond the throttle body and run down the silicone elbow and collect near the MAF, which hadn't happened with my stock plenum after 12,000 miles of driving. I think it is oil/fuel vapor that actually caused the problem because the MAF does not touch the bottom of the intake tube where the oil collected. I had to clean it about three times in less than 5000 miles. I did figure out that running the engine with about 3/4 of a quart less oil helps alot, and its been about 5000 miles since the last cleaning. Since I change my air filter every 10,000 miles I just plan to routinely clean the MAF sensor at the same time. CRC is the product I use and it works great! I would recommend that everyone clean their MAF sensor even if you have had no problems, it really make the engine more responsive and "crisp"...

POST 10Original post

i cleaned my maf and still same problem.... grrr....

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