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Could be the calipers too. Mine do it . Not sure why this design is so noisy , but they work well.

XxApolloxX97, I wish that was it, but it's not on mine. I can quiet that chains when I rev the motor, and it only rattles when I slow to an idle.

Check for a vacuum leaks. Once, I fouled up a upper intake reinstall which resulted in a huge leak that didn't show up until the #8 spark plug fouled from too rich gas. The car bucked , stalled, ect. no codes either.

I put in a new oil pump after the rattle returned when I replaced the guides/ tensioners the first time.. My original guides weren't worn threw , but the right side tensioner was stiff. I'm concerned I have a restriction or a clearence issue. Thanks for the reply, and if you think of anything I...

Did you discover the reason for the timing chain slack? I'm having that issue as well.

bump

I'm having the same problem also. I've replaced chains, guides and tensioners as soon as I heard the first tick. All guides were still intact, but very worn at 196k. The original passenger side tensioner was stiff, and it's chain had slack. After I replaced chains,guide, tensioners the chain...

What happened? I'm having the same problem

I reworked every connection to the battery and alternator but no help. every morning my battery light would come on for a minute. I rebuilt my alternator and fixed the issue

Funny thing, I'm having the exact same problem with nearly the same circumstances. My 2000 GT has a Motorcraft alternator. I suspect it's original. At 185000 miles my battery lite is flickering as well. I have checked all connections and found no problems. I have researched this problem. I...

My ball joints squeaked. I knew it was the ball joints when I looked under my 2000 and saw the rubber was gone. I'd just had a frontend alignment two days before I noticed them .lol Needless to say the mech got a piece of my mind.

Well, coincidenally I got an SCT tuner with a rear end package last May for my 2000GT. I tried everything in the book to get the 87 octane tunes to run my car, but they were terrible. Then I tried the 91 octane tune with prem gas and was shocked at how well it worked. I still use the 91 tune but...

Two other likely causes are a vacume leak or a bad coil over insulation boot. The latter often throws a code(300 to 308). I had a vacume leak that did that exact same thing you discribed and never thru a code.

Two other likely causes are a vacume leak or a bad coil over insulation boot. The latter often throws a code(300 to 308). I had a vacume leak that did that exact same thing you discribed and never thru a code.

Two other likely causes are a vacume leak or a bad coil over insulation boot. The latter often throws a code(300 to 308). I had a vacume leak that did that exact same thing you discribed and never thru a code.

I would think this is an IAC problem since it has the fiunction of holding the idle steady when the A/C or brakes put a load on the engine. I've had to replace two on my 2000gt.

Actually, I've been a member for awhile, but this is my first post. What can I say I'm shy. I want to thank all the members for the all the information you have on here. You've helped me keep my Mustang on the road!!