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Answers! May be BCG can help alot more than here! (archive)
[ Follow Ups ] [ 6-series (E24) Message Board ] [ Msg. Board FAQ ]
Posted by Peter/BCG on March 31, 2000 at 17:10:55:

In Reply to: Re: Answer questions for more info! posted by Fletch on March 31, 2000 at 14:24:58:

:
: : The 633 has some problems:
: : Details:

: : 1. Engine will start cold.
: What do you mean?

: Well, if the car has been sitting for couple of hours and has completely cooled down, then the car will start.
* Check thermal sensor! Ask the BCG group( very knowledgable/ experienced)- don't remember where it's located!

: : 2. Engine does not have much power.
: Describe:

: I changed the fuel pressure regulator, and now I have some power. The car surges, and shows brief seconds of good performance. Seems to sputter more when trying to get the car going from a stop.
*CHECKED fuel pressure? Chance are fuel delivery problem- filter, main and intank pump!

: Before installing the new f.p.r. the car barely had enough power to drive around. Pressing the gas pedal caused the car to run rough, resulting in no horsepower to move the car down the street. If I removed my foot from the accelerator the car would move slowly and the engine would run smoothly.
*Symton of fuel delivery! Either pump is weak/ going dead or filter is clog!

: : 3. Idle will go up and down while cold. (normal idle to around 1600rpms)

: Idle control valve- clean or replace!

: I have cleaned the old idle control valve, and saw maybe a mild improvement. Just got a new one, so that may be my next step.
*Keep finger X!

: : 4. The car will not restart after warming up a little.
*Thermal sensor again!

: Describe:
: After testing the car a little(couple of laps around the block), the car is much harder to start. Turns over just fine but almost seems if it has lost the spark or gas. This problem is better with the new fuel pressure regulator.

: The car came with a one of the three factory manuals. When troubleshooting the fuel injection or ignition, the manual uses the phrases like "Hard to start warm" and "Hard to start cold". Sorry for giving to little info and thanks for your reply.
Cold or warm starting problem is related to thermal sensors!
Let me know by email!

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