7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHSeafoam Issue or Oil Change
Leading reported evidence
Check work
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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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
Tippy, I thought the same thing and double-checked my work.
Leading evidence: 'Check work' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check work' (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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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
2) After I did the Seafoam treatment, I changed the engine oil and the filter.
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
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Performed · outcome unconfirmed · Original poster
1) Put Seafoam in my engine using the vacuum line off of the brake booster; used about half of the bottle.
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
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Performed · outcome unconfirmed · Original poster
I made the mistake of following the procedure that someone listed on this site and they also used the brake booster hose.
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Discussions that contain suggestions
1
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Suggestion
If you used the booster vacuum connection then you only got seafoam to the left bank.
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.
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: 20261027T031046Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
My car starts normal in the morning but when I drive off, the car hesitates for the first 50yds or so and then operates normally until I shut the car down and let the engine get cold again. I am trying to find out what I may have done to the engine this weekend.
I did two things on the same day.
1) Put Seafoam in my engine using the vacuum line off of the brake booster; used about half of the bottle. I waited the 20min soak time and started the car. The car had the normal white smoke come out of the exhaust but only the left exhaust pipe. On the bottle it says to make sure all cylinders are treated at the same time. Is this causing the problem? or.....
2) After I did the Seafoam treatment, I changed the engine oil and the filter. After I drained all the old oil out, I noticed that I only had 6 quartz of 5W50 synthetic. So I went to the store to get more oil, however all that they had was 15W50 synthetic so bought 2 quartz of that and added it to the 6 quartz of the 5W50 that I had.
Which if any of these may be causing my cold engine hestitation?
If you used the booster vacuum connection then you only got seafoam to the left bank. I bet smoke only came out the right tailpipe? You should use a vacuum line connected to the throttlebody.
I made the mistake of following the procedure that someone listed on this site and they also used the brake booster hose. I have a C4 and there doesn't seem to be a vacuum line off of the throttle body that I can use. I did find that Seafoam makes a spray version of their product and I may try using it to maybe rectify the problem if it is indeed the cause. I will remove the Mass Airflow Sensor and spray the Seafoam directly in the hole unless someone out there thinks that I will make my issue worse.
Tippy, I thought the same thing and double-checked my work. It is strange that this only happens when the engine is cold. After the engine warms up, everything is fine. That is why I am wondering if the heavier weight oil that I used to top off the engine is my root cause.
