Ok, please help me because I am struggling here.
Car is a 88' 325i SE UK spec
When I first drive the car, for the first 15-20 mins it's fine, can hit redline no problems, lots of power and drives fantastic.
Idles perfectly and smooth always, cold or hot.
After 20 or so mins I can't get above 5k RPM.
10 mins after that I can't get above 4k RPM
10 mins after that I can't get above 3k RPM
Quickly restarting the car allows me to reach redline again, but only for around 5 minutes then the problem returns.
NOTE: In neutral I can hit redline all of them time no issues
TPS tested and working fine.
Fuel fitler, pump and tank replaced.
AFM smooth and not stuck anywhere
No vac leaks (as far as I can tell with my crude setup)
What I don't understand is why this only happens after an amount of time.
At first, I thought it was gunk getting stuck on the fuel pump sock filter that built up over the course of a drive and caused RPM limit to decrease over time (as more gunk got stuck on) but this isn't the case.
I guess it's temperature related? Temp gauge never moves above the 1st bar for reference.
Video of the problem happening: https://streamable.com/e/n20q9g
Somebody help me please... This is my only car to commute with and it makes joining the motorway very difficult (lack of acceleration) - it's actually somewhat dangerous because I don't know when its gonna start happening and sometimes I need to accelerate hard match my speed when joining (we have some very very short slip roads here).
Car is a 88' 325i SE UK spec
When I first drive the car, for the first 15-20 mins it's fine, can hit redline no problems, lots of power and drives fantastic.
Idles perfectly and smooth always, cold or hot.
After 20 or so mins I can't get above 5k RPM.
10 mins after that I can't get above 4k RPM
10 mins after that I can't get above 3k RPM
Quickly restarting the car allows me to reach redline again, but only for around 5 minutes then the problem returns.
NOTE: In neutral I can hit redline all of them time no issues
TPS tested and working fine.
Fuel fitler, pump and tank replaced.
AFM smooth and not stuck anywhere
No vac leaks (as far as I can tell with my crude setup)
What I don't understand is why this only happens after an amount of time.
At first, I thought it was gunk getting stuck on the fuel pump sock filter that built up over the course of a drive and caused RPM limit to decrease over time (as more gunk got stuck on) but this isn't the case.
I guess it's temperature related? Temp gauge never moves above the 1st bar for reference.
Video of the problem happening: https://streamable.com/e/n20q9g
Somebody help me please... This is my only car to commute with and it makes joining the motorway very difficult (lack of acceleration) - it's actually somewhat dangerous because I don't know when its gonna start happening and sometimes I need to accelerate hard match my speed when joining (we have some very very short slip roads here).
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