Porsche 996 bore scoring references

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Suggestion · Original poster

PPI was completed and included a check for bore scoring.

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Search is over - 996 40th Jahre!

Suggestion · Original poster

5) Check for bore scoring with endoscope (good luck seeing anything...LOL)

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Codes P300 p301 p302 p303 rough idle.

Suggestion · Original poster

I will check for bore scoring when the sump is off.

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My 99 Carrera Progress Thread

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Suggestion · Original poster

All I needed to do is change the oil when I got home.

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Search is over - 996 40th Jahre!

Performed · outcome unconfirmed · Original poster

Changed the oil and then took her for a drive.

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Car rolled in gear now misfiring

Suggestion · Original poster

For something with this many miles that doesn't show any bore scoring, will have me keeping an eye on it, changing the oil, using good gas, and warming it up properly in the winter....I'd think this is about as solid as you can ask for with a sub $30k 996, right?

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Opinions on buying a 996 as an upgrade from a 986

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Suggestion · Original poster

Goes to show that even if you're using the same oil, the formulations can and do change and the only way to know is to test the oil.

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Search is over - 996 40th Jahre!

Suggestion · Original poster

In 32 days I logged over 200 hours on the testing personally, tearing down, cleaning up, surface finish testing, ring tension testing, and reassembling the test engine while still on the dyno.During this time I burned 85 gallons of gas, and went through 15 gallons of test oil.

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Bore Scoring & SUMEBore Development Info on Tonight's PCA Tech Tactics LIVE!

Suggestion

But by all means, test your oil with every oil change.

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Bore scoring survey

Discussions that contain suggestions

22

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Suggestion · Original poster

Was hoping to go for test drive but ran out of time; the battery had gone flat, and family obligations.

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"new" C4S and engine rebuild; bad bore score

Suggestion · Original poster

I'm kind of set on the Ohlins but still waiting to do the test drive before pulling the trigger.

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Search is over - 996 40th Jahre!

Suggestion · Original poster

Walked me through all the options and what each setting will do and went out with me for a test drive after.

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Search is over - 996 40th Jahre!

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Performed · outcome unconfirmed · Original poster

They machined the head, replaced the IMS, checked for bore scoring (there was none), replaced the piston rings, replaced the gaskets, checked the block, replaced the clutch, replaced the AOS, replaced the spark plugs, etc.

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Advice/Help - White Smoke - 996 C4S

Performed · outcome unconfirmed · Original poster

I changed AOS because the AOS bellow was worn out / broken so I decided to replace the whole thing - tested with oil cap test and the engine almost choke when I removed the cap.

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AOS changed - smoke from left exhaust - bore scoring?

Suggestion · Original poster

Even though I replaced the AOS with new if failed.

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Fuel Trim and oil dilution question

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Suggestion · Original poster

The shortest version of my story is I bought 60k mile example of 2000 C2 with a 6-speed that came with a big stack of seemingly clean service records (all dealership or Pcar indy spots), bone stock other than an LN IMS retrofit which was installed at 39k miles and a heap of carbon interior parts, and a quiet, strong-running engine.

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Please Share Your 996 Rebuild Stories with Me!

Suggestion · Original poster

100 miles and things are fairly smooth, no more smoke and smooth running engine.

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2002 C4S - HPDE Day Resulting in White Smoke and Cyl 6 Misfire

Performed · outcome unconfirmed · Original poster

I ran the engine for a while to get it up to temp, occasionally giving it some revs by hand operating the throttle body.

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MB Motorsports Engine Rebuild - A Warning

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Performed · outcome unconfirmed · Original poster

I recently replaced my engine with a freshly rebuild long block (the new engine appears to have already failed, but that's for another thread).

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Do These Cylinder Walls Look Normal?

Suggestion · Original poster

However when you buy a Porsche and pay �53500 for a two year old one you don't expect to be replacing the engine after 7 years of ownership.

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Porsche Problem that winds me up.

Performed · outcome unconfirmed

Engine was replaced at 30k and it has 94k on it now (I bought it with 92.4k on the chassis).

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First Oil Report Card

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Suggestion · Original poster

I don't really need a daily living where I do in DC and my neighbor is a total legend for letting me use his car when needed.

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Search is over - 996 40th Jahre!

Suggestion · Original poster

I think I have to stop the doom and gloom scenarios and just use the car.

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How does bore scoring start?

Suggestion · Original poster

Such a shame because I was very picky about using a car with low miles and excellent condition, there's barely a scuff anywhere inside or out on this car.

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2002 996 C4: Bore Score, Valves or?

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Suggestion · Original poster

Zero smoke of any kind on start up since collecting it and all the oil is still in the sump 1300 miles later (after recent oil change)!

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Search is over - 996 40th Jahre!

Suggestion · Original poster

Chris's German Auto Service, changed pads, but didn't mention rotor change)

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Carfax minor damage 996.1 - looking for opinion

Performed · outcome unconfirmed · Original poster

- Low Temp Thermostat (water pump just changed)

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First Porsche- 2003 911 Carrera 4S (Journal)

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Suggestion · Original poster

For the cracked head concern, should I change the water pump from the start or should i wait for any symptoms to show up?

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Newbie here

Suggestion · Original poster

Is that a sign to change the water pump?

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Newbie here

Performed · outcome unconfirmed · Original poster

The water pump has been replaced at some point.

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Rattle during warm idle

Discussions that report identifying a cause

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Discussions that suspect a cause

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Reported cause

I explored the AOS option, my AOS was also new but I had a lot of guidance telling me it was the AOS.

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Blue smoke when driving

Suspected cause · Original poster

Just dropped it off at my independent shop, they suspect AOS but will also look for evidence of valve guide seal leakage.

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996 C4: white/blue smoke on startup, burning oil

Suspected cause

I was really hoping it was the AOS, which would also explain some increased oil consumption and make purchasing UAOS WAF friendly.

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Engine health "blow-by test"

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Reported cause

It�s only an issue until it happens to you, and yes this particular problem is an issue on these and many other plated cylinder aluminum block engines.

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Bore scoring on 996 ?

Suspected cause · Original poster

Lol...probably the issue with many Porsche owners.

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Please help, bought used and may have bitten off more than...

Discussions that suspect a cause

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Suspected cause

They're a good looking car, probably the best after a turbo and with 4 wheel drive are very capable.

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Potential 996 40 year anniversary purchase

Suspected cause

There's some very good info there, probably the best that I know of.

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Bore scoring 2007 Porsche Cayman S

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Suspected cause

Since you have the sump off, probably a good idea to borescope it and hopefully find you don't have bore scoring.

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996 Rebuild, Refresh or Something Else Needed?

Suspected cause

With older vehicles, if you see mayo on the oil fill cap, it's likely your oil isn't getting and staying at temperature long enough to vapor off moisture and shortening drain intervals to 3 months or 3k miles is probably a good idea.

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What is Considered Low RPM Driving?

Discussions that suspect a cause

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Suspected cause

Which I think is probably a good thing.

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Motor is toast

Suspected cause

I suspect as another reply suggested, most people are oblivious to the problems - probably a good thing because if every car was considered a ticking time-bomb with a £10k bill somewhere down the track, they'd all be worthless......

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Bore Scoring - Cayman S Gen 1 - Page 2 - Boxster/Cayman - PistonHeads UK

Discussions that report a fix

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Discussions that performed work without a confirmed outcome

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Reported fix

I have fixed engines that had valve timing skip due to being rotated backwards.

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Car rolled in gear now misfiring

Performed · outcome unconfirmed · Original poster

Hartech’s approach to bore scoring and D-chunking is to use a thoroughly engineered Nikasil liner approach and the company’s principal Barry Hart was very sceptical of other repairers who insert a steel liner, Hartech seeing quite a few of these repaired engines which have only lasted a few thousand miles.

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Your IMS Bearing and Bore Scoring Questions Answered by Hartech

Suggestion

I stopped dealing with the purchases of rollers, and repairing the engines when I became afraid that I'd deal with the wrong person that couldn't be pleased.

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Bore Scoring? - How to sell a 996 with potential problem

Discussions that report a fix

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Reported fix

I fixed the vacuum leak but the CEL still remained.

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3.6 L Cayman S Oil Smoke Issues

Suggestion · Original poster

I have read several general misfire as well as cyl 1 specific misfire threads and had been working my way through the likely causes by swapping coils and plugs, smoke testing and repairing vacuum leaks, replaced cyl 1 injector.

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Nikasil Bore Scoring

Discussions that report a fix

1

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Reported fix · Original poster

Replaced both valve springs on cylinder 1 He put everything back together and it was running without issue - no more CEL or misfires, but still with the slight vibration every few seconds at idle.

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Mystery cylinder 4 misfire with code P1316