I finally got my headers installed yesterday, and noticed that the car seems to idle a bit rougher now. Is this normal when you get headers? It doesn't sound like anything is loose. The whole car just sort of rumbles, subtly at idle, like the car is a bit anrgy about the extra power.

 

Couple of things to check.

1) Disconnect the negative battery terminal. Let the car sit for about 30 minutes. Connect the battery and start the car. Make sure the AC/heat is turned off. Wait until the fan kicks in. See if it makes any difference.

2) Take back to where you had installed. Check to be sure oxygen sensor is tight and all bolts are on tight.

------------------
1999 Satin Silver Metallic 3.2 TL w/o Navigation

• 18x8 Racing Hart C2s with 225/40ZR18 Dunlop SP Sport 9000
• Comptech Springs, Sways, Exhaust, and Headers
• Red AEM CAI w/bypass valve
• A'PEXi Digital VTEC AFC
• Factory Underbody Kit and Spoiler
• Clifford Intelliguard 9000 Alarm
• Alpine 6 disk CD Changer
• BEL 945i Cordless Radar Detector
• Burlwood Shift Knob & Trunk Tray
• 20% tint

Mugen Grill on order

 

Flex joint maybe?

 

Yeah I would think it would be the O2 Sensor.

 

I think it would take a couple of starts for the computer to learn/compensate for the new mod.

 

I disconnected the battery and let it sit for about an hour. At first, the idle speed was lower than before, then it wandered up and down about 15 minutes while I was driving. I noticed that the rumbling seems to be at a specific RPM (approx. 550-650 rpm).

It seems like Tann might be right. The car seems like it's been feeling it way since I disconnected the battery (resets the ECU right?)

I'll make an appointment to go back to the shop next week and see how it goes til then.

I'll keep you posted. Thanx for the tips guys.