Pulse Sensors...... - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

 
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#1 (permalink) Old 11-29-2004, 07:41 PM
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What kind of problems come up if a pulse sensor goes bad? Or speed sensor? I have a 1989 325i and lately there has been a stutter of sorts while the engine runs. There is slight hesitation, and lack of power, but the engine has a constant miss during all operations (idle, partial, full throttle). There is good fuel pressure, the fuel pres reg is ok, no vacuum leaks (that I have found..hehe), new spark plugs, and they all seem to be firing.

Is there any way of checking the timing? Everything that I have seen says that it is a self contained process, with no way of adjusting. ANY info would be very helpful....thank you all.

dave
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#2 (permalink) Old 11-29-2004, 09:11 PM
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Quote:
Originally posted by mosyslack@Nov 29 2004, 07:41 PM
What kind of problems come up if a pulse sensor goes bad? Or speed sensor? I have a 1989 325i and lately there has been a stutter of sorts while the engine runs. There is slight hesitation, and lack of power, but the engine has a constant miss during all operations (idle, partial, full throttle). There is good fuel pressure, the fuel pres reg is ok, no vacuum leaks (that I have found..hehe), new spark plugs, and they all seem to be firing.

Is there any way of checking the timing? Everything that I have seen says that it is a self contained process, with no way of adjusting. ANY info would be very helpful....thank you all.

dave
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i own a 89 325i conv. and had the same problem and it may be very simple.

first does it do this MORE-SO when the tank is almost empty?>
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#3 (permalink) Old 11-29-2004, 10:35 PM
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unfortunately, nope....the tank is at least 3/4 full! What do you have in mind?

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#4 (permalink) Old 11-29-2004, 11:13 PM
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+ mine does that too, somedays i have a jerking effect useally when im cruising along at a pace and sometimes when i just top a hill and start to decline down the other side. jerk, jerk, hesitate jerk, then goes away.


THE GOOD NEWS = most likely not
NOT injectors,
NOT timing, ( or most likely just replace every 40,000mi.)

it may be the exhaust manifold...
it may be the air-intake needs cleaning

some of the ABOVE PROBLEM may be due to other things besides fuel and intake.

ive got the factory exhaust and when doing the HOT-SOAK i noticed some smoke coming from the exhaust manifold...
this indicates a major loss of power and perhaps the culprit of the jerking i have in all gears, with a full tank or empty and more often(i think) on days when the weather competes with BACKPRESSURE created by tiny hairline cracks in my manifold.

again if i had not ever done the hot-soak i would not have noticed the leak.
and since i did.
im now going with headers and a catback... anyone please help me find one ...

but your main problem could be a simple vacuum hose, that controls the fuel regulator , the air filter, a crack in any air intake housing (squeeze the big black hose in-between the airflow meter and the intake manifold --simple fix), also could be a
- loose ground wire
- poorly adjusted idle
- rotor, cap, wires,...... rotor, may have water in it
- coil
- fuel grade ... ...........higher or lower octane .. mine runs best on 87 oct.
- fuel filter
- fuel hoses,
- fuel gas cap,........... the seal may be old
- fuel pressure,
- fuel regulator ........ easy 10 minute-$65 dollar fix,
- vacuum hoses .. ...10 cents a foot, need one foot
- exhaust ...................back pressure
- catalitic converter,,,.. im counting the days for a cat-back system 300.00
-

i also pulled out the fuel pump and it was scary at first but really easy, i may buy a high end one because it will be a breaze to replace but the exhaust is first.

plus i heard i could get upto 30 more horsepower from the cat-back and headers.

anyways start with the cheap stuff and report here for great advice from the bmw fanatics.
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