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YOUR RESEARCHRemedying black soot from exhaust pipes. Help with part numbers.
Reported repair
Repair some vaccum leaks, i have posted elsewhere
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Reported fix · Original poster
I also fixed some vaccum leaks, I have posted elsewhere on the forum
Remedying black soot from exhaust pipes. Help with part numbers.
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Leading evidence: 'Repair some vaccum leaks, i have posted elsewhere' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, The most frequently discussed action is 'Repair some vaccum leaks, i have posted elsewhere' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Repair some vaccum leaks, i have posted elsewhere', supported by resolution reports in 1 discussions. These are forum reports and suggestions, not a confirmed diagnosis.
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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.
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Remedying black soot from exhaust pipes. Help with part numbers.
Replace spark plugs
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Performed · outcome unconfirmed · Original poster
My spark plugs were replaced a month ago with NGK BKR7EQUP (4285).
Remedying black soot from exhaust pipes. Help with part numbers.
Use bosch 0258006433 and 0256006435
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Performed · outcome unconfirmed · Original poster
Oxygen Sensors post&pre cat: I used BOSCH 0258006433 and 0256006435.
Remedying black soot from exhaust pipes. Help with part numbers.
Use mobil1 5w50
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Remedying black soot from exhaust pipes. Help with part numbers.
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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.
6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261027T154520Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hello,
My 996.2 (2002) has 300k kilometers (200k miles) on the clock. It has soot on the left exhaust, we boroscoped it a month ago during its service and all is clean. So I am trying to minimize the soot otherwise known as unburnt fuel. I am looking at 2 areas, oxygen sensors and ignition coils. My spark plugs were replaced a month ago with NGK BKR7EQUP (4285).
Ignition Coils:
My car has 2 types BERU 0040.100.031 DHZ3 and 0040.100.021 AFT2. This latter one is also designated as 997.602.102.00. I am planning to change all of them. Which part number to use please? Autodoc shows 0040.100.178 UBE1 but I am not sure.
Oxygen Sensors
: Left exhaust means right side (cylinders 4-5-6). Which sensors should I replace? Before and After Catalytic converter? Which part is the right one?
Apart from that, can you guide me to the correct trim values I should get? I am in the process of making a PIWIS 3 with 6154 clone to work, in order to get the values of each side and compare with a benchmark... I dont know what the benchmark should be though.
Thank you in advance.
After a lot of experimentation i think i managed to get the best out of right bank of my engine. Soot is reduced, much-much closer to the left bank.
I replaced the following parts:
MAF SENSOR: I used NGK 93006 (made in the UK)
INJECTORS: 3x BOSCH 0280156053 (blue ones)
Oxygen Sensors post&pre cat: I used BOSCH 0258006433 and 0256006435.
I use Mobil1 5w50 with one bottle of Ceratec.
The result speaks for itself:
This is a photo after 200km on the road. Adaptations were reset after changing the o2 sensors.
I have not replaced the coil packs.
from the top. Since then, I made 5000km and added 500ml of oil. Was running 5w40, I switched to 5w50 last week. The car is not burning any oil or smokes, so I am happy. I also fixed some vaccum leaks, I have posted elsewhere on the forum
I paid for a Bosch one, probably faulty because I didnt get the result I needed. This is why I post part numbers, so that it can be useful to somebody else
This is a source reference. Confirm exact model applicability in the original material.
