7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHRough Idle and Slowly Dying out
Reported repair
Repair now
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
1 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.
Leading evidence: 'Repair now' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, The most frequently discussed action is 'Repair now' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Repair now', 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.
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
I hadn't fitted the rear plenum tube correctly, with one of the seals crimped.
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
Recently replaced a leaking fuel rail on a 1998 3.4L C2.
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
To replace the leaking fuel rail, I did have to unbolt a lot of wires, hoses, remove intake plenums etc.
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.
911uk: 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: 20261026T222516Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Recently replaced a leaking fuel rail on a 1998 3.4L C2.
The car now runs very rough and if left at idle, slowly dies out. The engine does however rev up.
To replace the leaking fuel rail, I did have to unbolt a lot of wires, hoses, remove intake plenums etc.
Is this rough idle down to poor/wrong injectors as this is the only part which was changed. Or could this be something more simple I may have forgotten to reinstall/installed incorrectly?
I understand its probably best I get an OBD Scanner to diagnose.
I appreciate any help provided!
So I have now picked up an ICARSOFT Scanner. What information should I be looking at which would indicate my issue?
I can see "Misfire - 1" and throws a "Faulty/sporadic voltage" fault code.
When RPM falls below 900rpm, it really starts to choke out.
Any particular vacuum lines I should be checking?
What's the P code on the iCarsoft P0301? An air leak would be multiple cylinders so P0300 (multiple misfires) along with P0301 ,2, 3, 4, 5, 6 (cylinder specific misfire). Some of the small vac hoses can become very brittle with age.
Is the electrical connector seated properly on injector 1, or is the O-ring on the injector into engine damaged?
Cloud even be an unassociated coil pack issue.
Fixed now!
I hadn't fitted the rear plenum tube correctly, with one of the seals crimped. Clearly allowing a lot of air through.
They can be a pain to deal with those things.
Thankfully, it wasn't down to bad injectors!
Thanks for the help.
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