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#12
08-27-2007, 07:25 PM
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injector cleaner would not hurt either - if injectors clogged or gummed up also cause hot spots - fuel mixture also acts like a coolant - once a week on the interstate, drop down a gear, and run high revs could also help - used to have to take my Mom's '69 280SL out on (the then incomplete) I-78 to blow out all the carbon buildup as all she did was local stop'n'go driving.
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Mark         _______________________________2001 X5 4.4i topaz blue/sand Sport, complete Dinan S2  , hitch, V1, tint, BSW Stage 1, Alpine INA-W910BT___________ Life is not fair! You can't protect people from their own stupidity! Laughter makes life worth living 
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#13
08-27-2007, 07:28 PM
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Quote:
__________________
2001 X5 4.4SP Black on Black 
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#14
08-27-2007, 07:39 PM
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Yeah, but that doesn't get engine temps up long enough to do any good, especially when you have to come off the gas right away - these engines love med-high revs(2500-4000) for long "autobahn" runs - Knew a guy who drove a Ferrari in NYC, every other week it was in the shop because of fouled plugs - he never gave it a healthy "gallop"
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Mark _______________________________2001 X5 4.4i topaz blue/sand Sport, complete Dinan S2 , hitch, V1, tint, BSW Stage 1, Alpine INA-W910BT___________ Life is not fair! You can't protect people from their own stupidity! Laughter makes life worth living
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#16
08-27-2007, 07:55 PM
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like I said, drop down a gear - but I admit that's no fun - out west here, I can run 100+ for long periods of time
__________________
Mark _______________________________2001 X5 4.4i topaz blue/sand Sport, complete Dinan S2 , hitch, V1, tint, BSW Stage 1, Alpine INA-W910BT___________ Life is not fair! You can't protect people from their own stupidity! Laughter makes life worth living
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#17
08-27-2007, 09:50 PM
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Quote:
Detonation occurs when excessive heat and pressure in the combustion chamber cause the air/fuel mixture to autoignite. This produces multiple flame fronts within the combustion chamber instead of a single flame kernel. When these multiple flames collide, they do so with explosive force that produces a sudden rise in cylinder pressure accompanied by a sharp metallic pinging or knocking noise. The hammer-like shock waves created by detonation subject the head gasket, piston, rings, spark plug and rod bearings to severe overloading. Mild or occasional detonation can occur in almost any engine and usually causes no harm. But prolonged or heavy detonation can be very damaging. So if you hear knocking or pinging when accelerating or lugging your engine, you probably have a detonation problem. Another condition that is sometimes confused with detonation is pre-ignition. This occurs when a point within the combustion chamber becomes so hot that it becomes a source of ignition and causes the fuel to ignite before the spark plug fires. This, in turn, may contribute to or cause a detonation problem. Instead of the fuel igniting at the right instant to give the crankshaft a smooth kick in the right direction, the fuel ignites prematurely causing a momentarily backlash as the piston tries to turn the crank in the wrong direction. This can be very damaging because of the stresses it creates. It can also localize heat to such an extent that it can partially melt or burn a hole through the top of a piston. My advice is to change your driving habits.
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-Arjay
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#18
08-28-2007, 01:42 AM
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Everyone has a valid point here. But I've heard the knocking of other X's and I truly understand what this man is talking about. Look, try the flush, at the same time, drop some fuel cleaner in there also, it will not hurt. If non of these things help, then do the spark plug change. If that doesn't help, then you will need to find a good indy and get to the bottom of this problem. I don't want to scar you, but you might have a camshaft problem. Lets hope that maybe the flush or the spark plugs can help.
Good flush is the Gold Eagle brand... Any parts store has it. Like I said before. I had a little knock in my engine when I first bought it. I did the flush and dropped some BG44k cleaner and the engine quited down not right away but after maybe 2 oil changes later. Now she runs the way she's supposed to. Good Luck my friend. Let me know if I can help with anything else. Wish you lived closer to me, I've got a great indy, that can tell you within 10 mins to what is going on.
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#19
08-28-2007, 01:43 AM
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Everyone has a valid point here. But I've heard the knocking of other X's and I truly understand what this man is talking about. Look, try the flush, at the same time, drop some fuel cleaner in there also, it will not hurt. If non of these things help, then do the spark plug change. If that doesn't help, then you will need to find a good indy and get to the bottom of this problem. I don't want to scar you, but you might have a camshaft problem. Lets hope that maybe the flush or the spark plugs can help.
Good flush is the Gold Eagle brand... Any parts store has it. Like I said before. I had a little knock in my engine when I first bought it. I did the flush and dropped some BG44k cleaner and the engine quited down not right away but after maybe 2 oil changes later. Now she runs the way she's supposed to. Good Luck my friend. Let me know if I can help with anything else. Wish you lived closer to me, I've got a great indy, that can tell you within 10 mins to what is going on.
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