E34 shakes during 3k RPM's

[e34]

When i step on the gas the bmw shakes at arround 3k RPM's, its like when i hit the gas half way the car looses power, its like i have let the gas peddal go, but i havent, what could be the problem? Its a 89 525i 5spd M20, Its just at 1,2,3,4 gear when i hit the gas halfway it starts to shake, like it looses power and then i release the gas and press it gently then works ok. So what could be the problem, please help?

[bimmerd00d]

that's where it comes into it's power band, it's most likely bad fuel pump or clogged filter. Also might check the center bearing, could be that as well as another problem.

[632 Regal]

could be normal too, you cant balance an engine perfectly throught its entire rpm range so theres a give and take. If your flywheel was replaced or something of that nature it might not have been balanced properly. my M-60 has a shake at 1100-1300 rpms but smooth throughout the rest.

[e34]

No its not normal, because it looses power its like i have stept off the gas peddal, even tho im still on it. Could be the fuel filter or pump, i will have it checked with a mechanic.

[andyman32]

Nah, c'mon Jeff, I know the 8 is a bit cantankerous and tempermental, but a nice & tuned BMW I6 is as balanced as a ballerina and smooth as a baby's butt all the way up the band. Sounds like his motor is having a fuel and/or air flow problem in high revs. I agree with bimmerdood - fuel pump or filter.

Could be engine mounts too - might be worn and lets the block have more play when it's under greater stress, maybe?