Originally posted by Stonecoldchavez:
This is funny this topic is coming up a lot these days. Because my Xterra, with 51,000 miles, is doing the same thing lately. It "pings" only on heavy acceleration until I let off the gas pedal. But, not everytime though. 
Possible bad fuel pump? I tried going up to 89 octane and it stopped for a while. This tank I have in now is 89 octane and it pinged yesterday. It is not a "knocking" or "clicking" noise. So I do not think it is the exhaust manifold. It is definitely a "pinging" noise. I remember when Brent said in the manual it says that the engine will ping as the computer retards the the timing for better fuel mileage, or something to that effect......
Does anyone think my timing could be off?
Plus, my idle s-u-c-k-s ever since I can remember when my truck is in Drive. It idles at a little over 500rpm, when it is supposed to be around 750rpm. I am thinking possible vacuum leak here. Thoughts?
StoneStone, all the problem I am having sounds exactly like yours. My idle is low when the tranny is in Drive. It idles down close to 500rpm also and so I get a lot of studder or vibration when I'm stopped at a light. I don't know what the problem is. I'm more concerned about the pinging as that sounds like it can do a lot more damage to my engine than the low idle. Any car guru know why it's doing this? I noticed it's gotten a lot worse. I'm thinking maybe I need to put in better engine oil, but from what I've read, engine oil won't fix the problem. Help!
David
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