I know this drives you guys nuts, but please forgive me. I've searched numerous sites and I cannot find a similar noise noted anywhere! I have a noise in my engine that I would NOT call a knock. More like a chirp, flutter or maybe a clinking. Not knock. The car is a '97 with 64,000 miles, stock bottom end, PI heads and PI intake. All bolt-ons except headers. The car does have a mail-order tune that's been fine for over a year (in fact all mods have been working fine for over a year). Makes about 245 hp at the wheels on the dyno, so I don't think I've smashed the rods or pistons. Sometimes I get the noise on start up, then when it warms up it goes away. Sometimes, I get the noise only above 3,000 RPM and up. It definitely is contingent on the RPM with it's frequency.
I've been told: it's a bad oil filter, exhause leak, detonation, piston slap or rod knock.
I've changed the oil filter with only Motorcraft, I've checked the manifold to h-pipe bolts and h-pipe to cat-back bolts, I've put octane boost in it to rule out detonation, just in case the tune got screwy somehow or I got bad gas. I've check all the plugs and wires.
The car does not idle rough, or have a miss and it still runs great all the way through the rev range.
Please help me out with this before I pay a mechanic to listen to it. Any help is appreciated.
Thanks!
I've been told: it's a bad oil filter, exhause leak, detonation, piston slap or rod knock.
I've changed the oil filter with only Motorcraft, I've checked the manifold to h-pipe bolts and h-pipe to cat-back bolts, I've put octane boost in it to rule out detonation, just in case the tune got screwy somehow or I got bad gas. I've check all the plugs and wires.
The car does not idle rough, or have a miss and it still runs great all the way through the rev range.
Please help me out with this before I pay a mechanic to listen to it. Any help is appreciated.
Thanks!