11 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH99 C2 intermix
Leading reported evidence
Check coolant tank and sure enough, milk shake
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
Checked the coolant tank and sure enough, milk shake.
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
( check the actual cam timing and cam advance using the actual values in a good scanner)..also I hope you put the new actuators on the correct banks...they are "bank specific "
Leading evidence: 'Check coolant tank and sure enough, milk shake' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check actual cam timing and cam advance' (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 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
It was last changed 4 years ago along with thermostat.
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
it's quite possible it took this long for a piece of plastic to end up somewhere it shouldn't have been, but being four years since the pump was replaced, unless the car hasn't been driven much, it's probably not a cracked head caused by water pump failure debris.
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.
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
( check the actual cam timing and cam advance using the actual values in a good scanner)..also I hope you put the new actuators on the correct banks...they are "bank specific "
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check actual cam timing and cam advance
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
( check the actual cam timing and cam advance using the actual values in a good scanner)..also I hope you put the new actuators on the correct banks...they are "bank specific "
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.
Unsuccessful attempt · Original poster
Also installed new idle control valve, MAF sensor. Engine runs amazing and strong after the reassembly but shortly generated codes came back with the following among a bunch of random generic codes:
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
it's quite possible it took this long for a piece of plastic to end up somewhere it shouldn't have been, but being four years since the pump was replaced, unless the car hasn't been driven much, it's probably not a cracked head caused by water pump failure debris.
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.
11 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 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: 20261027T060112Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi Rennlister,
Recently caught intermixing in the 3.4L. Noticed the oil level dropping suddenly last week, decided to top up and monitor. Noticed the oil filler cap was sucked shut. Found the milkshake inside the tube and cap when I eventually got it to open. Checked the coolant tank and sure enough, milk shake. Mechanic determined indeed oil in coolant and some coolant in oil?
-No smoke, no CEL, no misfire
-Oil cap is tight (vacuumed shut)
-No leaks
-Temperature has been stable, always at 180 mark: short drive, long drive. Low & high rev.
I'm thinking head cracked and/or oil cooler failure.
The plan is to flush, clean out the gunk, drop the engine and determine which of the two. Am I missing anything here?
Car is a 1999 Carrera 131,000 miles.
It's unlikely to be a bad oil cooler. Only seen one failure in all these years.
Did the engine have a water pump failure and subsequent failure that you are aware of? Usually the heads will crack 6-9 months after a water pump fails. Like Yelcab mentioned, cracked cylinder is likely the cause of the intermix if the water pump hasn't failed previously. If the water pump happens to be original to the car, I'd recommend pulling it to see if the impeller has come apart.
It was last changed 4 years ago along with thermostat. What are the symptoms of failed water pump? I just recall temperature always sits at 180 over the zero.
I don't recall overheating but sounds like I should start looking for a replacement engine rather than repairing?
The impeller will start coming apart. Little bits of plastic then get embedded in the coolant passages in the heads and they crack. It's not necessary to overheat the engine to have the heads or cylinders crack.
it's quite possible it took this long for a piece of plastic to end up somewhere it shouldn't have been, but being four years since the pump was replaced, unless the car hasn't been driven much, it's probably not a cracked head caused by water pump failure debris.
It may be possible to pressurize the cooling system and inspect each cylinder with a bore scope to see if you can see coolant entering the cylinder.
Putting in a used engine is going to be a crap shoot. The best option will be to rebuild it. Cracked cylinder is no problem. Block can be sleeved and you can bump the displacement at the same time to 3.8 liters. If it is a cracked head, I would avoid any repairs with welding and just seek out a good used head that can be pressure tested and rebuilt.
Car sat mostly for 2 years during covid, and driven daily during the past 2. In this case, how involved is rebuilding/re-sleeving back to a factory 3.4L assuming other things are ok internally ie: heads etc.
There are many other DIY guys that have tackled a rebuild of their 996 engine without any prior experience as long as they were mechanically inclined. Along with a few specialty tools, you'll want the Focus on M9X dvd series which will go over in detail every step of the rebuild process:
https://lnengineering.com/focus-on-m...embly-dvd.html
Considering the cost and effort, there is no reason to build the engine back to stock size as there is no added cost to go bigger (3.8 liters in your case). This page summarizes the process and options:
https://lnengineering.com/products/w...e-scoring.html
If you get in to a rebuild, there is no good reason NOT to go 3.8 , the sleeving process you can see on various videos on line from Both LN engineering and Hartech.
Its a BIG process.. Not a overbore and a pressed in sleeve.. I had mine done 3.8 and love it. (I had a 3.6) More torque is always good..
Update: heads were cracked and sent to Len Hoffman for repairs. While at it, we changed the variocam solenoids, pads ands obviously refreshed AOS, oil cooler, water pump, oil pan, cam position sensors with new parts. Also installed new idle control valve, MAF sensor.
Engine runs amazing and strong after the reassembly but shortly generated codes came back with the following among a bunch of random generic codes:
B0D48 (Nondescript)
C2B17 (Nondescript)
C0313 (Nondescript)
P3900 (Nondescript)
P0085 (Exhaust valve control solenoid bank 2)
P1319 (Misfire)
P1318 (Misfire cylinder 6)
P1316 (Injector circuit/misfire cylinder 4 emission)
P1715 (Speed signal left front)
P1531 (Acclerator pedal movement/Camshaft adustment bank 1)
P1324 (Timing chain out of position bank 2)
Idle also dips for a few times occasionally on warm starts/ stalls when the dips are too heavy. Any ideas?
(Oil pressure sender appears to have gone out. reading 0.5 bar at engine off.)
It looks like you used a Generic Code Reader ... Ignore all the generic codes and focus only on Porsche Specific codes....IE P1xxx
It looks as if you have a bad speed sensor/wiring on the left front..
A missfire on cyl #4 (check that coii and injector are fully plugged in)
And the cams are not properly timed.. ( check the actual cam timing and cam advance using the actual values in a good scanner)..also I hope you put the new actuators on the correct banks...they are "bank specific "
Glad you got it back on the road with just a top end job ...
