Hi guys!
I had no extra time to open valve covers unfortunately. I had 2 chances to drive, so I gave stang a walk instead...
To refresh..
Engine had lower intake off, I cleaned all hydro rollers in petrol, was running okay after that for a while until end of winter. Then we changed complete front part (water pump, chain & sprockets, cooler clutch, harmonic balancer). Knock started in winter in between balancer changes (had 2 faulty ones delivered).
Sympthoms:
-at cold start, rpm raises a bit by itself as normal procedure - no knock...
-after few seconds idle normalizes and I can hear knock - tap, tap, tap (in rhythm with timing light)
-when coolant warms up knock fades away
-there is no knock or at least I cant hear it when driving or if I raise RPM and/or under load
-when driving, at around 1000rpm I can sometimes hear thin can rattle, like catalyst heat shield is loose or cat is falling apart inside.
What I did:
-since knock started, I give it a good warmup before each drive, for knock to fade away
-used Liqui Moly hydro roller additive few hundred km before oil change - no effect
-changed oil for Mobil1 5w-30 full synth and KN PS-3001 filter - no effect
-tightened smog air tube behing motor (I fixed complete smog system in December)
-checked spark plugs - tight
-tightened exhaust manifold bolts at heads - were loose a bit, but no change
I have uploaded video of cold start knock to Youtube:
View: https://youtu.be/pyhb7CmkZDc
On Saturday I bought STP Oil treatment Petrol and poured in...
It may have to do something with "fear and large eyes"... but I may think that knock started to have a extended time to "fade" and it "fades away" a little bit less in warmed up engine... at least I can hear it after using STP.
I still hope that this is sticky lifter.... engine runs as hell, no power loss, nothing! Oil pressure normal.
Please take a look at video and suggest something...
Thnx!
I had no extra time to open valve covers unfortunately. I had 2 chances to drive, so I gave stang a walk instead...
To refresh..
Engine had lower intake off, I cleaned all hydro rollers in petrol, was running okay after that for a while until end of winter. Then we changed complete front part (water pump, chain & sprockets, cooler clutch, harmonic balancer). Knock started in winter in between balancer changes (had 2 faulty ones delivered).
Sympthoms:
-at cold start, rpm raises a bit by itself as normal procedure - no knock...
-after few seconds idle normalizes and I can hear knock - tap, tap, tap (in rhythm with timing light)
-when coolant warms up knock fades away
-there is no knock or at least I cant hear it when driving or if I raise RPM and/or under load
-when driving, at around 1000rpm I can sometimes hear thin can rattle, like catalyst heat shield is loose or cat is falling apart inside.
What I did:
-since knock started, I give it a good warmup before each drive, for knock to fade away
-used Liqui Moly hydro roller additive few hundred km before oil change - no effect
-changed oil for Mobil1 5w-30 full synth and KN PS-3001 filter - no effect
-tightened smog air tube behing motor (I fixed complete smog system in December)
-checked spark plugs - tight
-tightened exhaust manifold bolts at heads - were loose a bit, but no change
I have uploaded video of cold start knock to Youtube:
View: https://youtu.be/pyhb7CmkZDc
On Saturday I bought STP Oil treatment Petrol and poured in...
It may have to do something with "fear and large eyes"... but I may think that knock started to have a extended time to "fade" and it "fades away" a little bit less in warmed up engine... at least I can hear it after using STP.
I still hope that this is sticky lifter.... engine runs as hell, no power loss, nothing! Oil pressure normal.
Please take a look at video and suggest something...
Thnx!