88NOTCH

i was out driving my mustang a few weeks ago and decided to do a high speed pull, i got it up to around 140 and shut it down, when i got home i pulled into my driveway the engine was making a tapping noise. i had a mecanic look at it and all he did was pop the hood and he told me it was a bent rod. since then i have looked into replacing the motor but want to be sure before i pull it out? the oil pressure on the motor is the same as it was before, the noise is a loud tapping sound, i pulled the plug wires and when the passanger back cylinder wire was pulled the sound got quietier. the sound seems louder at idle but fades away as the revs go up on the motor. the motor is all stock, only mods to the car is exhaust/intake/timing. i just dont see how i could bend a rod on a stock motor that easily. btw the car/engine had 90,000 miles on it

ckyguy68

a "bad rod" would not get quieter as the engine revs.

might not be getting enough oil in one of your lifters. once the oil pressure boosts a bit, that might fill the lifter up and cure your problem.

89GTRed

you sure its not a pinging? have you tried backing off that timing?

Twisted

I've heard people discuss this problem before. It's always after the car has been run hard. It sounds like a lifter being starved for oil. A lot of people have said that the problem goes away after a short time. But I agree, a broken rod or spun bearing would not get quieter with revs--nor could it be confused with a "tap."

91lxstang

a broken or bent rod would gte louder in higher rpm's if anything

88NOTCH

what all do i need to check my lifters. is it under the lower intake manifold? what will i be looking for when i look at the lifters? whats the best way to clean them?

Hung Like a Stang

what about someting as simple as an exhaust leak from a blown out manifold gasket. That could happen after running it hard as well.

88NOTCH

i pulled the throttle body off to get to the valve cover just now and i found coolant inside the throttle body? please help

foxontheprowl

that coolant probably came out of the EGR spacer, it's supposed to be there to keep it cool.

foxontheprowl

+1 mine has a leaking header gasket and it sounds kinda like a tapping and gets quieter with RPMs