Hello and thanks for your question. My name is XXXXX XXXXX I will do all I can to help.
Let me first ask, is the check engine light currently on while driving?
no it does not come on at all while engine is running.
alright, If the check engine light doesn't come on at all while the engine is running, then I doubt there are any trouble codes stored.
Does the oil light every come on ? at idle especially?
The oil pan O-rings and pick up tube O-ring were bad to get hard and crack on these overtime.
Does this engine come equipted with knock sensor?
No dash , warning lights come on at all.
Yes it does. they are under the intake manifold. Which is why I asked if the check engine light was on, If the check engine light was on, then I would have suspected knock sensor codes.
Is it turbo or non?
i do not get any dash board warnig lights at all. No turbo..
alright, If you don't have any check engine light, then I feel sure no codes are stored for the knock sensors. Which would lead me to believe they are functioning as designed.
You ran higher octane fuel and it made no difference at all? didn't make it ANY better?
I get the feeling it may be (Dwell).. With the higher octane fuel, it seemed a bit peppyer. Alldo the valve rattle was still there.
Right, we don't set the timing on these, it's computer controlled completely.
Distributor only goes in one way.
I would say first, you want to change your spark plugs, make sure you use factory Volvo plugs in that motor. relatively cheap from the dealer.
aftermarket plugs, can cause a spark knock. so double check them.
After installing plugs, I would then go to Autozone, see what kind of combustion chamber cleaner they have, There are a few different ones on the market. Sea Foam Redline, etc. Put a couple of bottles of that through the tank. I would not doubt some carbon deposits in the cylinders. And if you get some deposits, they will cause a spark knock. Cleaning the combustion chambers would definitely help it if that was the case.
i never knew spark plugs could produce a knock. However i will replace them with Dealer plugs. P.S. this was a 1 family car.It was maintained ( top notch). I normally use LOCUS fuel system cleaner.. Should i change to sea foam?
I AM WORKING OFF A PUBLIC LIBRARY P.C. I have 5 minutes time remaining. Can we pick this up from my personal L top.Say in 1 hour?
I believe Sea Foam makes a injecotor cleaner, also another product called intake and combustion chamber cleaner. (Can't remember the exact name) Redline makes a product specifically for reducting combustion chamber depsosits. It's a toss up on which really is the best though in my opinion, I would look for a product that specifically said reduces Combustion Chamber deposits and cleans Combustion Chambers though, More so than just a fuel injection cleaner, we used to clean combustion chambers with walnut shells taking the plugs out and had a nozzle that would blast the chambers. I've also sprayed water directly into the engine before while idling, Kind of a steam cleaning effect. When a headgasket blows, you pull the head and the cylinder that is cleanest is the one that had antifreeze in it. So there are a couple of tricks to getting carbon out, but I would use a product specifically for combustion chambers.
Yes, let me know if you have any further questions. Thank you.
Tnxs, will do