blue car

sounds like lifters clatter however added stp , had oil flushed and changed no difference , could it be injector noise , still getting 26 per gal help

whopper

What engine - and what year? And how many miles on it so far?

firemangeorge

X2 on needing info.

Plus. Does it clatter just on start up ? only when accelerating? all the time ?
Where is the noise coming from? Front of engine? Back?

blue car

full time knock it's front top side two sounds one sounds like lifters the other just knockinf =g sound 200,000 miles

firemangeorge

First thing I would do is check for oil pressure. With a gauge, not just going by the light.

Vaux

Try Archoil, Archoil | The Latest Developments In Nano lubrication http://www.ebay.com/itm/Archoil-AR-S-Kit-for-Car-Truck-ATV-Treat-up-to-8-Quarts-Oil-336-Gallons-Any-Fuel-/140952452580?pt=Motors_Automotive_Tools&hash=item20d16bbde4&vxp=mtr#ht_1040wt_900
I put it in a 2010 Equinox (4 cylinder) only product that stopped detonation. Higher octane was a waste of money, other fuel additives useless. Expensive, but I did notice improvement in mpg, at current useage it would save me about $80.00 a year in gas. Eventually pays for itself. I used the fuel and oil treatment.

whopper

I thought I asked what year and what engine it was. :)

blue car

sorry its an 08 mid size engine no turbo 2.2

Snoopy

Archoil.....interesting product. But I doubt if it would correct an engine mechanical problem. Might be a "Band-Aid" approach, covering the underlying problem.

Excessive valve train, or engine knock (if it is) if far different than spark knock do to low octane or poorly blended gasoline, imo.

blue car

will try more oct just for drill