91 bmw 318is acceleration problems.... help!!

R

rob_mase

New Member
#1
Messages
1
Likes
0
Location
montreal
#1
Hi, I got problems with my 91bmw318is.
The engine seems to misfire when accelerating .
This happens when the trottle is fully opened.
I replaced the spark plugs and wires..........still the same problem.
The TPS is working properly.Could it be the fuel filter?
Has anyone had this problem?
pls help me!!!!!!!! [headbang] [mad] [screwy] [screwy]
 
B

Ben

Active Member
#2
Messages
576
Likes
0
Location
NY
#2
check the air filter, fuel filter, Air flow meter, maybe the timing, check for vacuum leaks, maybe put some injector cleaner in it, distributor cap/rotor.... thats all i can think of off the top of my head.
 
T

ThuMPer3ld

New Member
#3
Messages
2
Likes
0
Location
NYC
#3
Crap, im having the same exact problem with my 91 318is. I thought it was my #4 ignition coil but i was wrong. If you find out, please let me know. It wasnt my fuel filter either. Originally thought it was bad gas, so i had the tank drained, and they replaced the fuel filter and i still have the problem.
 
E

epj3

Senior Member
#4
Messages
7,370
Likes
0
Location
Lancaster, PA
#4
Ben said:
check the air filter, fuel filter, Air flow meter, maybe the timing, check for vacuum leaks, maybe put some injector cleaner in it, distributor cap/rotor.... thats all i can think of off the top of my head.
Click to expand...
M42's don't have a distributor. It sounds like a vacuum problem though.
 
B

Big Daddy

Senior Member
#7
Messages
10,446
Likes
5
Location
PNW (Left) Coast
#7
My 91 318is had a random rare hiccup at crusing speeds where the car would feel like it shut off for a nano second. It was very rare and I was never able to duplicate the problem for a mechanic. But I never had a misfire. Lost a vacuum hose once and the car idled rough but at speed was ok. Have you checked your coils?
 
E

epj3

Senior Member
#8
Messages
7,370
Likes
0
Location
Lancaster, PA
#8
Big Daddy said:
My 91 318is had a random rare hiccup at crusing speeds where the car would feel like it shut off for a nano second. It was very rare and I was never able to duplicate the problem for a mechanic. But I never had a misfire. Lost a vacuum hose once and the car idled rough but at speed was ok. Have you checked your coils?
Click to expand...
Did the M42 have the same kind of crank position sensor as the m20/m30? The one on the front of the motor, picking up a reading off the vibration dampener. If that's dirty it could cause the problem... but i'm not sure if the m42 had that.
 
You must log in or register to reply here.


Top