Here's the background:
I bought my 1998 cobra #23 in laser red a year and a half ago. She had a spun rod bearing on cylinder 7, and the previous owner had the crankshaft turned .40 under. So, a year later. The motor rebuild is done, and it wants to idle at 1500-1800 rpm when in neutral and she dies when I put the clutch in when exiting the hwy. under deceleration. Both problems happen maybe one out of ten times. If it's idling high, i can usually blip the throttle to about 3k and it will idle back down to 650 rpm, if I turn the key off and re start the car the problem usually goes away. If it stalls and I'm rolling I usually pop the clutch to restart it while rolling.
So, we did do some mods while rebuilding. I'm running a sct tune with imrc deletes and cat delete from rmcr in colorado springs, but haven't seen dyno time, and probably won't for quite a while. The cylinders were honed, it has manley h-beam rods, diamond alum forged pistons, stock spec german crankshaft, imrc deletes, x-pipe without cats, flowmaster mufflers, windage tray, head cooling mod, ARP bolts and head bolts, new timing chains and tensioners, new plugs and wires, water pump, upgraded cobra clutch from FRPP, heads refreshed by Fox Lake Power Products in Ohio, but no major porting done.
Break in went smooth, we've since replaced a couple things like a vacuum line and the plug wires. It has stalled and idles high sometimes since getting it running again. The tuner says that it will throw codes until I get it on the dyno. It is throwing lean condition bank 1 and bank 2 and catalyst inefficient. I took it to my mechanic and his code scanner said it had bad ROM on the PCM, so I just had the dealer install a new pcm and it still stalls and idles high. There's not much else to replace. Could it be the throttle position sensor? Could it be a fuel pressure issue? If so, how do I test it? Could something be gunked up and sticking? I'm hoping there's something we just missed and didn't hook up. Any ideas or suggestions would be much appreciated!
I bought my 1998 cobra #23 in laser red a year and a half ago. She had a spun rod bearing on cylinder 7, and the previous owner had the crankshaft turned .40 under. So, a year later. The motor rebuild is done, and it wants to idle at 1500-1800 rpm when in neutral and she dies when I put the clutch in when exiting the hwy. under deceleration. Both problems happen maybe one out of ten times. If it's idling high, i can usually blip the throttle to about 3k and it will idle back down to 650 rpm, if I turn the key off and re start the car the problem usually goes away. If it stalls and I'm rolling I usually pop the clutch to restart it while rolling.
So, we did do some mods while rebuilding. I'm running a sct tune with imrc deletes and cat delete from rmcr in colorado springs, but haven't seen dyno time, and probably won't for quite a while. The cylinders were honed, it has manley h-beam rods, diamond alum forged pistons, stock spec german crankshaft, imrc deletes, x-pipe without cats, flowmaster mufflers, windage tray, head cooling mod, ARP bolts and head bolts, new timing chains and tensioners, new plugs and wires, water pump, upgraded cobra clutch from FRPP, heads refreshed by Fox Lake Power Products in Ohio, but no major porting done.
Break in went smooth, we've since replaced a couple things like a vacuum line and the plug wires. It has stalled and idles high sometimes since getting it running again. The tuner says that it will throw codes until I get it on the dyno. It is throwing lean condition bank 1 and bank 2 and catalyst inefficient. I took it to my mechanic and his code scanner said it had bad ROM on the PCM, so I just had the dealer install a new pcm and it still stalls and idles high. There's not much else to replace. Could it be the throttle position sensor? Could it be a fuel pressure issue? If so, how do I test it? Could something be gunked up and sticking? I'm hoping there's something we just missed and didn't hook up. Any ideas or suggestions would be much appreciated!
