fullymatted.
Back to search
Rennlist

3.8 L air box with 3.4L MAF?

Add to repair workspace
Open repair workspace
Original source
7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH3.8 L air box with 3.4L MAF?

Leading reported evidence

Replace 3.4l airbox (c2 1999 mecha) by a 3.8l one

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

A couple years ago, I replaced my 3.4L airbox (C2 1999 mecha) by a 3.8L one.

Original post Read captured discussion
3.8 L air box with 3.4L MAF?
Read full discussion summary

Leading evidence: 'Replace 3.4l airbox (c2 1999 mecha) by a 3.8l one' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace 3.4l airbox (c2 1999 mecha) by a 3.8l one' (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 · 7 captured posts examined · 0 partial discussions

Compare 4 other evidence results

Replace their air boxes

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�ve had my 2003 C2 3.6 for about 8 months and have seen some owners who have replaced their air boxes with the newer 3.8 models.

Original post Read captured discussion
3.8 L air box with 3.4L MAF?

Replace mass air flow sensor

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

Now, it is time to replace my old MAF.

Original post Read captured discussion
3.8 L air box with 3.4L MAF?

Replace would require a custom ecu program

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

Nope the MAF is calibrated to the ECU and any change would require a custom ECU program to deal with it.

Original post Read captured discussion
3.8 L air box with 3.4L MAF?

Run problems

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

That's why you have not had any CELs or running problems after the swap.

Original post Read captured discussion
3.8 L air box with 3.4L MAF?
Frequently discussed actions (6)

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

Replace 3.4l airbox (c2 1999 mecha) by a 3.8l one

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

A couple years ago, I replaced my 3.4L airbox (C2 1999 mecha) by a 3.8L one.

Original post Read captured discussion
3.8 L air box with 3.4L MAF?

Replace mass air flow sensor

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

Now, it is time to replace my old MAF.

Original post Read captured discussion
3.8 L air box with 3.4L MAF?

Replace their air boxes

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�ve had my 2003 C2 3.6 for about 8 months and have seen some owners who have replaced their air boxes with the newer 3.8 models.

Original post Read captured discussion
3.8 L air box with 3.4L MAF?

Replace would require a custom ecu program

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

Nope the MAF is calibrated to the ECU and any change would require a custom ECU program to deal with it.

Original post Read captured discussion
3.8 L air box with 3.4L MAF?

Run problems

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

That's why you have not had any CELs or running problems after the swap.

Original post Read captured discussion
3.8 L air box with 3.4L MAF?

Use different maf plug than the electronic throttle cars

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

Also, I assume the OP's '99 has a cable throttle which uses a different MAF plug than the electronic throttle cars.

Original post Read captured discussion
3.8 L air box with 3.4L MAF?
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.

7 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: 20261027T192637Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

A couple years ago, I replaced my 3.4L airbox (C2 1999 mecha) by a 3.8L one. I kept the original snorkle and 3.4 L MAF sensor. This configuration worked fine as the car passed 2 smog test in CA. ( the visual inspection was a joke)... Now, it is time to replace my old MAF. I read on the Bosh website that the MAF sensor function is sensible to the box design. What do you think? Should the MAF sensor been upgraded according to the box design to optimize its function?

POST 2Original post

Nope the MAF is calibrated to the ECU and any change would require a custom ECU program to deal with it. Not to mention the airbox design from the 3.4 to the 3.8 is not that drastic of a change. That's why you have not had any CELs or running problems after the swap.

POST 3Original post

Quotes source post: 17368004

Also, I assume the OP's '99 has a cable throttle which uses a different MAF plug than the electronic throttle cars. Cable on the left, e gas on the right.

POST 4Original post

I have had a 3.8 air box in my car with the 3.4 maf for 10+ years with no problem. On the 3.8 box there is another vacuum actuated flap that I have never hooked up though.

POST 5Original post

I�ve had my 2003 C2 3.6 for about 8 months and have seen some owners who have replaced their air boxes with the newer 3.8 models. Is there a performance or sound upgrade difference? If so, is there anything that needs to be done to facilitate the change and where wold I be able to find a new one? Joe

POST 6 / ORIGINAL POSTEROriginal post

Quotes source post: 17369403

The 3.8 l airbox looks nicer and sounds better

This is a source reference. Confirm exact model applicability in the original material.