RE: E30 4 Cylinder Running Problem

["Ron Buchalski" <rbuchals@xxxxxxxxxxx>]

Tom,

I'm not sure what you mean when you say that the engine speed "rolls", but 
you need to check the throttle position sensor and it's connections.  When 
the throttle plates are closed, it provides an indication to the engine 
computer to run in 'idle' mode.  When you open the throttle plates, it tells 
the engine computer to get out of idle mode and control fuel based on 
incoming air, throttle position, and engine speed.  It also provides an 
indication of wide open throttle for WOT operation.

The other thing to check is your air flow meter and it's connections, since 
it provides the engine computer with a measurement of incoming air.

- -rb

Your fuel pressure regulator is probably fine, and if your fuel pump was 
bad, you car wouldn't run at all.
>
>Date: Wed, 23 May 2001 09:37:57 -0400
>From: ToMoyer@domain.elided
>Subject: RE: E30 4 Cylinder Running Problem
>
>Here is my current problem on an '85 318i.  After using a citrus degreaser 
>on the entire engine compartment, the engine has correct fast idle speed 
>and will idle at its correct speed all day long, but once you either try to 
>rev the engine up above fast idle speed while in neutral and parked or you 
>try to drive the car and try to accelerate, the engine speed 
>rolls.........sounds like either a spark or fuel problem.  All electrical 
>connections have been dried and blown out with air.  All ignition 
>components seem to check ok with volt/ohm meter.  Fuel pump relay is ok. 
>Question, have I overlooked something very obvious or has something decided 
>to take a dumb at this particular time leaving me to believe that washing 
>the engine and compartment is the culprit?  I'm leaning towards either the 
>fuel pressure regulator or the fuel pump since it seems to be running out
>of fuel once the throttle is opened more than fast idle speed.  Any
>opinions on the source of this problem are welcome as it has me frustrated 
>and probably not thinking clearly (of course going to school full time and 
>having major exams several times a week also clouds my thinking right now 
>when it comes to the car(s) as I am preoccupied with school studies).
>Thanks in advance to those on the list and responses can either be posted 
>on the list or sent directly to me at:  ToMoyer@domain.elided.

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