8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHFuel injector help needed - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Use 3.4l rail
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
For the fuel rail I used a 3.4L rail because it bolts up directly and is a return type.
Fuel injector help needed - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Frequently discussed work
Check )
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
I ordered a set of new injectors and will swap out after the holidays so that I have a known good (I built a setup to flow check) to proceed with my troubleshooting.
Fuel injector help needed - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Read full discussion summary
Leading evidence: 'Use 3.4l rail' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check )' (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.
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
I ordered a set of new injectors and will swap out after the holidays so that I have a known good (I built a setup to flow check) to proceed with my troubleshooting.
Fuel injector help needed - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace 2.5l
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
I have a 2.7L 5 chain engine out of a 01 Boxster going in a 1999 replacing a 2.5L.
Fuel injector help needed - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Run 2.7l as they go
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
I don’t think I can run the 2.7l as they go on a returnless system.
Fuel injector help needed - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Run on the 2.5’s dme
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.
Fuel injector help needed - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Frequently discussed actions (8)
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check )
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
I ordered a set of new injectors and will swap out after the holidays so that I have a known good (I built a setup to flow check) to proceed with my troubleshooting.
Fuel injector help needed - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use cable
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
I eliminated the rear crossover flap in the intake and used the 2.5’s wiring harness and the 2.5’s intake crossover and throttle body so I could use the cable.
Fuel injector help needed - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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.
8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
Finally got one that worked off of a member of this forum and traded for my 2.7 returnless rail.
I’ve read through most of the posts on this subject and thought I would get the group’s opinion. I have a 2.7L 5 chain engine out of a 01 Boxster going in a 1999 replacing a 2.5L. I have kept the original intake crossover and used it as the front so that I could retain the cable driven throttle body. For the fuel rail I used a 3.4L rail because it bolts up directly and is a return type. What fuel injector do you recommend? Still running the stock computer with no tune (yet). I don’t think I can run the 2.7l as they go on a returnless system. That leaves me with the 2.5 (no specs found) or the 3.4 injectors? What is your opinion?
The injectors on the rail from the 3.4 should work fine.
The injectors from the 2001 should work fine too.
The change to the non-return fuel system occurred in the 2002 model year. Injectors should be the same as 2000 & 2001 except for the second notch missing on the later injectors. The main difference is that the fuel pressure regulator is in the tank as part of the fuel sender unit rather than at the rail on the engine.
Ike84 did an interesting thing a few years back:
https://986forum.com/forums/diy-project-guides/80079-986-2-injector-retrofit.html
Did find this interesting when searching for injectors for a 99 Boxster. Yes, I know, it's Amazon and their cross and is probably highly inaccurate but still worth asking. Is this true? Has anyone tried it?
Since the 2.7l is variocam plus, what dme are you going to use to get it to run? The one from the 2.7l car? If so, does that work with the return style injectors and cable throttle??
It’s a 5 chain engine. (Regular variocam). It will run on the 2.5’s DME. I eliminated the rear crossover flap in the intake and used the 2.5’s wiring harness and the 2.5’s intake crossover and throttle body so I could use the cable. The fuel rail, I can’t remember what it came from either a 2.7 return type or a 3.2 or 3.4. It was 2 years ago and I tried so many different rail setups. Finally got one that worked off of a member of this forum and traded for my 2.7 returnless rail. That is the reason for the original question. When the engine was installed, I was dumping fuel on bank 2. Didn’t know if the slightly increased flow rate was the reason and all indications are that it is not. I ordered a set of new injectors and will swap out after the holidays so that I have a known good (I built a setup to flow check) to proceed with my troubleshooting. The only other thing I had to do was swap the coolant temp sensor. Basically the DME thinks it is a 2.5. It should easily compensate for the slightly increased displacement until I get it sorted. I have most of this on video if you are curious. I am not trolling for views as my videos are far from being monetized. Just did this to help a little and to have a video record of the process I followed. Chanel is here:
https://youtube.com/@branchoffice1327?si=yYWvNy-YvCZwxGTH
OK all buttoned up yesterday. Started up just fine. No muffler so I can see exhaust on both sides. smoke from the driver's side (Bank 2). Off idle runs very smooth. Sounds very healthy. LOTS of smoke from bank 2. set off smoke alarm in building even with the exhaust vac connected. more smoke than the vac motor could keep up with. Clearly another problem. going to make a new post as the injector issue is resolved.
This is a source reference. Confirm exact model applicability in the original material.
