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Thread: 2 Noises
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Old 12-07-2012, 01:31 PM   #2
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What I Drive: 2007 white ZX3

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Just my $.02 and a couple guesses

Originally Posted by Neptune15 View Post
2007 ZX3 2.0 Manual

First Noise:

This has been there for about a year, but it doesn't really affect performance (just hope it's not a safety hazard) so i haven't looked into it. I hear a popopop sound when going slow over bumps, and it sounds like it's coming from the left front. I can feel a little bit of vibration through the cabin when this happens. Sometimes when I clutch down and the pedal hits the firewall, it makes a similar noise. The latter is a newly developing issue.

Upgrading the shocks/struts didn't affect this noise.

When I poke around, everything seems tight except for the stabilizer bar endlinks, which have a little give. I'm not sure if they are supposed to have a little give or not. The sound is coming from one side, and the endlink feels the same on both front corners. I can rotate the endlink about the y axis, not sure if this is normal?
When you replaced the struts, did you replace the plastic "strut bearing" rings at the mounts? If the struts can't rotate a little bit during spring compression, they can make a spring popping noise.

Endlinks should have no play, but you can get them to rotate a little around the vertical axis if you grab them and twist. It should be firm and tight, not sloppy and loose.

If you can get the front wheels off the ground and check for sloppy ball joints, tie rod ends, etc.

Originally Posted by Neptune15 View Post
Second Noise:

This is a newly developing problem. Might have to do with the cold. When coming to a stop, I hear a groaning/creaking. The last thing I did to the car was swap the brake lines for SS lines, but I'm not sure how that can be the culprit.

The car still has a year left on the warranty, but I'd like to get some idea of what could be the problem before bringing it in.

Thanks for any feedback.
Some brake pad friction material is just noisy on some cars. Sometimes, perfectly fine aftermarket brake pads and rotors make a horrible moaning sound that can only be rectified by swapping to OEM or equivalent.

The pads on my focus make a bad groaning noise when they are cold or the rotors have flash rust on them, goes away after one stop every time. I don't know what kind of pad they are, they stop just fine so I will wear them out.

Originally Posted by Neptune15 View Post
EDIT: Bonus problem:
One morning, when it was really cold out, my car would start fine, but immediately die. It wouldn't hold an idle. I warmed up the car with my foot, and tried again, but still no idle. I disconnected/reconnected the IACV, still no idle. I cycled the key a couple times and it worked. This only happened once, but I'm wondering if I should be concerned.
Maybe it was gunked up with deposits, or one pole of the stepper motor is dead, or it was just too cold, or who knows. If it happens again, I would be more concerned, if it never replicates, meh.
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