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Discussion Starter #1
Hey all!

Just bought a 2003 ZX3 that's had some small modifications made, generally very happy with it. (The modifications are listed below).

But I'm having two odd issues:

- At anything above 50mph, it's very very loud in the car. I think the wheels might need rebalancing? Or could one of the mods have made it very loud? Maybe the exhaus?

- This one is a bit more worrying: when I get the engine up to about 3k rpm in first, second, third, or fourth gear (not tried in 5th), it really starts shuddering as if it's going to stall. This is really odd. When I slow down or change up a gear, it returns to normal.

I'm very car inexperienced, so any advice would be helpful! I had it checked over by a mechanic before buying, so I hope it's nothing too serious.

Thanks!
zen focus

FACTORY FEATURES:
• 16 Valve DOHC 4 Cylinder Engine
• 16-inch Alloy Wheels
• Cruise Control
• Air Conditioning
• Leather Steering Wheel
• Tilt Wheel
• Power Steering
• Dual Airbags
• CD & AM/FM Stereo

MODIFICATIONS:
Performance
• Superchip High Performance Computer Chip (Multiple Settings)
• Borla Catback Exhaust System
• Mac Shorty Headers
• Focus Central 65 mm Throttle Body
• Focus Central Adjustable Cam Gears
• Iceman Cold Air Intake
• Screamin' Demon Coil Pack
• Live Wires (Low Resistance Spark Plug Wires)
• Focus Sport Underdrive Pulley Kit (Lightweight Aluminum)
• K&N Air Filter

Appearance
• SVT Honeycomb Upper Grille
• SHM Aluminum Racing Pedals
• Chrome Interior Knobs
• Steeda Stainless Steel Lighter
• OBX Diamond Plate Stainless Steel Floor Plates (floor mats)
• Ford Racing Shift Knob
• Ford Racing Altezza Tail Lights (not installed)
• Aluminum Emergency Brake Handle
• HKM Stainless Steel Window Cranks
• Front End Cover (Bra)
 

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I notice you said Tune, are you running 87 on a 93 tune?....
 

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Pasta.. where u been I still want those ebrake cables lol :p.. Didnt mean to thread jack lol
 

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Discussion Starter #5
Thanks for the replies! By tune, do you mean the chip?

Actually when I picked up the car from the guy it was set on setting 1 (something like, aggressive or performance, use premium gas) but we set it back to setting 3 (standard). I filled it up with premium (93) petrol yesterday - should I put it back to setting 1 and see if the shuddering still happens?
 
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