Trouble at high RPM?

blue00gt · 02-04-2002, 01:51 PM

I bottomed out hard about a week ago (don't get me started about the crappy roads around here) and I noticed yesterday that I am developing an exhaust leak between the passenger-side header and the H-pipe. I didn't get a chance to fix it yet, and now when I tach it it will not rev past about 5200rpm in 2nd gear. You can keep the pedal to the floor and it just does not accelerate anymore. It doesn't make any funny noises or buck at all in 2nd - it feels like it is running smoothly but it just won't rev any higher. As soon as you upshift it goes again like it should until you get to high rpms again. At the top of 3rd and the bottom of 4th I heard what sounded like pinging. There is no check engine light on. Could the exhaust suck enough air through the leak to mess up the O2 sensor and cause the computer to try to compensate? There is no check engine light on.
I plan on fixing the exhaust leak this weekend and then if that doesn't fix the problem I'll take it to the dealership. Anyone had any experience with a problem like this?

Mercury · 02-04-2002, 02:10 PM

A crushed and restricted exhuast will do that. Have you checked to see if you really hammered you exhuast? The O2 sensors just "finely Tune" the mixuture. The dont make enough of an adjustment that you'd notice that kind of power loss.

Check the exhaust closely, you might have a crimped section.

02-04-2002, 01:51 PM	#1
blue00gt Mustang Addict Join Date: Jan 2001 Location: McKinney, TX Posts: 1,294	Trouble at high RPM? I bottomed out hard about a week ago (don't get me started about the crappy roads around here) and I noticed yesterday that I am developing an exhaust leak between the passenger-side header and the H-pipe. I didn't get a chance to fix it yet, and now when I tach it it will not rev past about 5200rpm in 2nd gear. You can keep the pedal to the floor and it just does not accelerate anymore. It doesn't make any funny noises or buck at all in 2nd - it feels like it is running smoothly but it just won't rev any higher. As soon as you upshift it goes again like it should until you get to high rpms again. At the top of 3rd and the bottom of 4th I heard what sounded like pinging. There is no check engine light on. Could the exhaust suck enough air through the leak to mess up the O2 sensor and cause the computer to try to compensate? There is no check engine light on. I plan on fixing the exhaust leak this weekend and then if that doesn't fix the problem I'll take it to the dealership. Anyone had any experience with a problem like this? __________________ Strike down the unroadworthy! 2000 GT Atl. Blue: '03 Cobra motor - 465rwhp/473rwtq, T-56 6-speed, full MM TA/PH & tubular K-member suspension, Saleen body, 17" Torq-Thrust II's, M/T ET Street radials, and lots more '94 Rio Red Cobra: All the bolt-ons, 3.73s

02-04-2002, 02:10 PM	#2
Mercury The Redneck James Bond Join Date: Sep 2000 Location: Fayetteville NC Posts: 1,707	A crushed and restricted exhuast will do that. Have you checked to see if you really hammered you exhuast? The O2 sensors just "finely Tune" the mixuture. The dont make enough of an adjustment that you'd notice that kind of power loss. Check the exhaust closely, you might have a crimped section. __________________ 64 1/2 "D" code Red Mustang Coupe. Red Baron, 2000 Perf Red Mustang GT. 5spd. Stage 2 CNC heads with Large Valves, Comp Cams (270-274 dur .550 lift), Forged Crank, DRP pistons, Manly H-beams, Pro M 87 mm Mass Air, 24lb Inj, 75mm TB, Plenum Spacer ,Long Tube Headers, Homemade H-pipe, 2 chamber Flows, 4:10's, Steeda Tri-Ax, LKW 70/30's, Eibach Drag Springs, Steeda SubFrames, Battle Boxes, Rear Girdle, Adj uppers, Alunimum Drshft, Southside Lift Bars. Project Cars, 64 1/2 6cyl coupe, 1930 Model A Nostalgia Rod.

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