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i think my engine might be pinging/knocking, not sure 700 1990

posted by  invar on  Thu Apr 11 09:39 CST 2002
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last visit: Fri Feb 26 21:00 CST 2010
[RELATED]

In park, after warming up, I rev the engine up to around 5000-5500 quickly, and I think I hear knocking. I'm not sure, but it's like a slight muffled *thunk* (very light, could be mistaken for exhaust sound easily) but I believe it comes from the engine area.

I just cleaned out my throttle body and checked a bunch of hoses, so I believe those are okay. I'm certain everything is connected properly.

What else can be causing this?

I'm using the premium (92? or 94? octane) gasoline from Mobil, so I don't think it can be cass.

Also, on the wheel that the throttle cable connects to, what is the other cable for? I notice that when the throttle is applied, the wheel rotates and pulls the other cable.

Sorry if this is covered in the service manuals, I haven't picked one up yet, but I will. Any recommendations for which one to get? I haven't seen a 1990 740 Haynes manual yet.

Thanks.
--
Kenric Tam
1990 Volvo 740 base sedan (B230F)
My Volvo 'Project'






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