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Discussion summary
YOUR RESEARCH996 Bore inspection and emmission control light
Leading reported evidence
Test performed
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No successful repair reported for this finding.
0
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1
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Suggestion
Depending on what the CEL trouble code # is you may want to have a compression &/or leakdown test performed, which gives more info than a visual inspection.
Leading evidence: 'Test performed' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Test performed' (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.
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Suggestion
Since you had this done at a authorized Porsche dealer I would assume they used a bore scope (small camera probe) to view inside all the cylinders.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Test performed
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
Depending on what the CEL trouble code # is you may want to have a compression &/or leakdown test performed, which gives more info than a visual inspection.
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.
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What does a bore inspection entail? Porsche have just done a full inspection and a bore inspection on a 110,000 mile 1998 3.4 996 , it passed with no defects and the bores looked good.
However, immediately after the inspection ( leaving the garage) the emission control light came on. I was not driving the car at the time and was only told about it after ( I know the driver should have returned to the dealership to have it checked), I was told the car drove fine and did around 75 miles.
So my question is what would have the dealership disturbed to make the light come on? I wish to check this before having the car shipped back to the dealership that did the inspection.
What Joe said.
The plugs are removed and to do this each plug's coil is disconnected from the plug (at least) and may be removed too from the engine as well.
Then of course, the plug is reinstalled and the coil installed and connected to the plug and to the wiring harness.
There has been more than one misfire traced back to bad coil to plug or coil to wiring harness connection.
This misfire could arise from the coils receiving rough treatment. They should be handled with care. They are durable as long as they are only required to withstand the conditions under which they operate, but if they are removed and tossed about, banged about, they can suffer from this.
And the misfire could just be due to one or more bad coils. I wouldn't be surprised if the coils were original or if not that they haven't been replaced in a while.
[QUOTE=Dictys;12103001]
What does a bore inspection entail?
Porsche have just done a full inspection and a bore inspection on a 110,000 mile 1998 3.4 996 , it passed with no defects and the bores looked good.
Since you had this done at a authorized Porsche dealer I would assume they used a bore scope (small camera probe) to view inside all the cylinders. Removing a sparkplug & looking in aided by a flashlight is the 1st step & hopefully not the only step.
With the mileage on your 3.4L, which has the thinnest cylinder walls of any M96 engine, good chance they are worn out of spec. Depending on what the CEL trouble code # is you may want to have a compression &/or leakdown test performed, which gives more info than a visual inspection.
