inconsistent
Newbie
- Joined
- Mar 9, 2026
- Points
- 3
Hello, newbie to the forum,
First, thank you to all those who have helped with info over the many years. I joined on this day and I am grateful for the many posts I have read for helpful info. I drive a 2000 bmw z3 m52tub25, highly modified. So, I bought the car as a salvaged because it had been rear ended otherwise I would not have done any mods, originality is always best in my opinion. Here is some things ive done. Bought another 2.5 and pulled original motor out, 280000 miles is why. The new motor had about 68000, came with the 5 speed. I went through the whole motor with original bmw gaskets and seals. Rebuilt the vanos myself. Removed all emissions and installed an m50 manifold. Installed headers and ran dual exhaust with high flow cats and x pipe, with borrila cuffs on both sides of the rear, removed battery compartment. I never done this kind of work however forums such as these and YouTube was the key to my success. I had active autowerkes run me a tune via online. Put in a larger radiator and electric fan. New coilovers with a subtle drop. Rewrapped the interior with full grain black leather. Removed all the plastic wood and replaced with real wood and tiger veneer covered in a sun resistant two part epoxy. Deleted secondary air pump and ran a catch can in place using larg hoses. There are some things I done im sure im forgetting, oh, new bmw rotors and brakes paired with anthracite bbs 16 inch rims along with 17mm spacers that are to darn expensive but we're highly recommended. The first time I tried starting she fired right up and I left her alone. Just changed the oil using only bmw oil. Changed all the fluids using redline. She ran great taking her on 400 mile trips to see dad before he passed and around town during the summer. I live in Colorado, snow. There were times she seemed to have less power but still responded well, other times she had an enormous amount of power and have left a couple of young bucks subarus saying holy smoke where's the turbo. However, there were times this thing would just start missing like crazy, mainly at stop lights in which I would just turn her off and restart and she would be ok. Other times it would happen while cruising and again, switch the ignition off and restart she was fine. About a week ago she really started missing and I would give it more gas and she would straighten out giving me more power than usual. This went on for a few days and turning the ignition off and restart would fix it some times. Now, she is missing all the time and im stuck. She runs still and will drive with a sound as if the exhaust was plugged up. Now power no matter how much gas I give. Check engine light is on because I deleted the secondary air pump. Ran the diagnostic, cheap one, and it says a miss on cylinders 23 and 4. Im using original o2 sensor but deleted the post o2 sensor with the tune from active autowerkes. As I said, she always started instantly and ran very good. She still starts instantly but sounds like a clogged engine. Throttle still acts normal. I used the original coil packs that came with new engine. I've went through the air intact with some good cleaner in the throttle body, ICV, and maf. Didn't help but throttle was more responsive. I refuse to take it to shops because I think 180 an hour is to damn much. If you have some ideas they would be appreciated. I put in highly recommended four prong plugs about 6000 miles ago. Oil is very clean. Please share your thoughts and I will take them seriously and then follow-up. Could it be head gasket even though oil is clean? Will 3 bmw coil packs go out at the same time. Oh, I had the bmw injectors rebuilt when I installed the engine but had words with the guy because he took 4 weeks to do it, could he have sabotaged? Should the o2 sensor make her miss in 3 cylinders and not the others. Im 51 years old meaning im a little experienced in mechanical theories. If you could help, believe me, its greatly appreciated.
First, thank you to all those who have helped with info over the many years. I joined on this day and I am grateful for the many posts I have read for helpful info. I drive a 2000 bmw z3 m52tub25, highly modified. So, I bought the car as a salvaged because it had been rear ended otherwise I would not have done any mods, originality is always best in my opinion. Here is some things ive done. Bought another 2.5 and pulled original motor out, 280000 miles is why. The new motor had about 68000, came with the 5 speed. I went through the whole motor with original bmw gaskets and seals. Rebuilt the vanos myself. Removed all emissions and installed an m50 manifold. Installed headers and ran dual exhaust with high flow cats and x pipe, with borrila cuffs on both sides of the rear, removed battery compartment. I never done this kind of work however forums such as these and YouTube was the key to my success. I had active autowerkes run me a tune via online. Put in a larger radiator and electric fan. New coilovers with a subtle drop. Rewrapped the interior with full grain black leather. Removed all the plastic wood and replaced with real wood and tiger veneer covered in a sun resistant two part epoxy. Deleted secondary air pump and ran a catch can in place using larg hoses. There are some things I done im sure im forgetting, oh, new bmw rotors and brakes paired with anthracite bbs 16 inch rims along with 17mm spacers that are to darn expensive but we're highly recommended. The first time I tried starting she fired right up and I left her alone. Just changed the oil using only bmw oil. Changed all the fluids using redline. She ran great taking her on 400 mile trips to see dad before he passed and around town during the summer. I live in Colorado, snow. There were times she seemed to have less power but still responded well, other times she had an enormous amount of power and have left a couple of young bucks subarus saying holy smoke where's the turbo. However, there were times this thing would just start missing like crazy, mainly at stop lights in which I would just turn her off and restart and she would be ok. Other times it would happen while cruising and again, switch the ignition off and restart she was fine. About a week ago she really started missing and I would give it more gas and she would straighten out giving me more power than usual. This went on for a few days and turning the ignition off and restart would fix it some times. Now, she is missing all the time and im stuck. She runs still and will drive with a sound as if the exhaust was plugged up. Now power no matter how much gas I give. Check engine light is on because I deleted the secondary air pump. Ran the diagnostic, cheap one, and it says a miss on cylinders 23 and 4. Im using original o2 sensor but deleted the post o2 sensor with the tune from active autowerkes. As I said, she always started instantly and ran very good. She still starts instantly but sounds like a clogged engine. Throttle still acts normal. I used the original coil packs that came with new engine. I've went through the air intact with some good cleaner in the throttle body, ICV, and maf. Didn't help but throttle was more responsive. I refuse to take it to shops because I think 180 an hour is to damn much. If you have some ideas they would be appreciated. I put in highly recommended four prong plugs about 6000 miles ago. Oil is very clean. Please share your thoughts and I will take them seriously and then follow-up. Could it be head gasket even though oil is clean? Will 3 bmw coil packs go out at the same time. Oh, I had the bmw injectors rebuilt when I installed the engine but had words with the guy because he took 4 weeks to do it, could he have sabotaged? Should the o2 sensor make her miss in 3 cylinders and not the others. Im 51 years old meaning im a little experienced in mechanical theories. If you could help, believe me, its greatly appreciated.
