19 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHEngine Knocks
Leading reported evidence
Check prior
Suggestion or failed attempt
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Suggestion
It would also be helpful to know when the last time the oil was checked prior to this event.
Leading evidence: 'Check prior' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check prior' (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
If checked very recently, then seems like something happened on the last drive to cause it to lose that much oil.
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Suggestion
He is going to need to inspect your engine to give you an assessment of the damage you may or may not have done.
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Suggestion
Seems like the common sense next step would be to see how over-filled it is currently (after it has been sitting long enough after running, then drain it to 3/4 of the way between the marks (supposedly being top of range can cause AOS issues I think), and see if that changes anything.
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Suggestion · Original poster
I put 2.5 quarts of oil and turned the engine back and let it run for 1 to 2 minutes and the knocking sound is less.
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Suggestion
Seems like the common sense next step would be to see how over-filled it is currently (after it has been sitting long enough after running, then drain it to 3/4 of the way between the marks (supposedly being top of range can cause AOS issues I think), and see if that changes anything.
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Suggestion
I don't know the source of your knock but would venture a guess that you have too much oil in the engine after adding 2.5 quarts after just running the engine.
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Suggestion
You have a digital oil level gauge that you use every time you start your car.Even then you should never guess your oil level, you should know what it is.
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19 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T205155Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hello everyone,
I have 1999 996 and this morning started the engine and it had loud knocking sound on driver side so stopped the engine immediately and checked the oil dip stick tip and the oil only at the tip of the dip stick. I put 2.5 quarts of oil and turned the engine back and let it run for 1 to 2 minutes and the knocking sound is less. Does anyone know the problem to this and how to fix it and the cost to repair? Thank you in advance.
You gotta be kidding...right? You have a digital oil level gauge that you use every time you start your car.Even then you should never guess your oil level, you should know what it is. Is this your first car ever? Problem? Well..yeah. You probably spun a rod bearing on the crankshaft or scored a cylinder bore. Repair? 25K-30K
I don't know the source of your knock but would venture a guess that you have too much oil in the engine after adding 2.5 quarts after just running the engine.
You need to take your car to a qualified mechanic (via tow truck,) and explain the entire situation to him from the very beginning. He is going to need to inspect your engine to give you an assessment of the damage you may or may not have done. With the information you've given us all we can really tell you is "knocking sound = not good" & "adding 2.5 quarts of oil blindly and then starting the car = also not good". If you're lucky, after potentially overfilling the oil by quite a bit, the knocking sound is your only problem.
Strangelove nailed it. You may want to tow it to be safe. If you don't have a good Indy, let us know where you live and I am certain their will be suggestions. Keep your head up. It's never as good or as bad as it seems.
Well...yeah. But knocking noises from the 996 engine is never good. Reality. And, what he did by blindly adding oil without knowing his oil level to begin with is just bad practice. I do hope the OP finds the cause with a really good mechanic, but I have a feeling that this is going to be expensive.
He's tired of spending hundreds of dollars to post as a "sponsor."
It's really not worth it to him since he's already got more than enough customers to keep him busy.
It's a shame that he's leaving!
Really the only non-destructive knock you can ever hear is a bad VarioCam actuator. Anything else is
probably
expensive and destructive the the rest of your engine.
This is supposed to be a supportive community. You don't have to know a darn thing about the car to own and enjoy it, so let's ease up on the scolding and try to help the fellow out. Solutions instead of blame - any potential damage has already been done, so it's pointless and rude to further punish the contributor.
And there are a myriad of things that can make strange noises on these and any other cars.
Agree with this. Seems like the common sense next step would be to see how over-filled it is currently (after it has been sitting long enough after running, then drain it to 3/4 of the way between the marks (supposedly being top of range can cause AOS issues I think), and see if that changes anything.
It would also be helpful to know when the last time the oil was checked prior to this event. If checked very recently, then seems like something happened on the last drive to cause it to lose that much oil.
Good luck to OP, fingers crossed it turns out to be something not too difficult to fix.
