I've got a 96' Z24 with a rebuilt motor.
At idle the motor sounds fine.
If you give it throttle slowly, its fine.
If you give it throttle quickly(when you can see the motor move), it makes a odd pinging/knocking sound.
Also under a load in lower RPMS(3k or less) you can here it as well, most noticeably when going up hill.
Under the hood you can't trace the sound to any one place, it sounds like its coming from the exhaust side of the motor.
Now its got a intake, pacesetter 4/1 header and borla muffler.
The motor is babied, never really hard on it, been striving for good gas millage.
Last oil changed was about 1500 miles past due, but looked okay coming out.
Now a few weeks ago the car bottomed out on a huge ass speed bump, and I know the exhaust was damaged.
Its hanging a few inches lower and you can hear it rattle sometimes.
Is this sound something internal or could it be a exhaust leak from the speed bump damage?
Its only be noticeable since that speed bump incident, but sounds like its from inside the motor;
But when you try to isolate the sound, it keeps "moving" around.
I'm hoping maybe the exhaust is busted somewhere and is echoing the sound into the engine bay.
Any ideas?
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Also, from outside or inside the car it sounds like its coming further back then the engine bay.. if that helps any
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what Octane fuel you running? What RPM and gear when going up a hill?
FU Tuning
Maybe you broke the in side of you cat .
87 I think? the reg. unleaded.
It can be in any gear going up hill, gets louder the lower it gets after about 3k rpms(usually doing around 2500 up hill, in 5th or 4th).
Inside of my car?
We being serious or is that a joke?
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Probably bent something or broke a weld on the exhaust and you have a leak. If it was something major internal it would knock constantly. I'd take a good look at the exhaust. Start with the connections and then check the header if the connections are fine.
Thats good to hear... I'm gonna get a shop to check it out when I get my new muffler welded on.
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You know the Catalytic Converter or the cat as some call them.
Sounds exactly like what my car was doing recently. Quick throttle blips caused knocking but nothing at idle. Firm acceleration was fine but at part throttle cruise there was a persistent rattling. I thought it was the timing chain or something in the block but it was the ac compressor pulley. If you haven't already you should run the car without the accessory belt just to make sure it isn't a pulley or tensioner.
