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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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Old 01-03-2005, 10:45 AM   #1 (permalink)
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I have this problem... when my 325i conv. goes over 5000rpm it hesitates and shakes the car and doesnt allow it to pass the 5000rpm mark and i have to let it change gears there

what can i do to fix it...
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Old 01-03-2005, 11:52 AM   #2 (permalink)
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-your timing is off (that's what happened to me, too far advanced)

-there is something wrong with your your fuel system/ check fuel pressure
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Old 01-03-2005, 03:11 PM   #3 (permalink)
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Could be the rev limiter. My car does the same thing.
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Old 01-03-2005, 05:37 PM   #4 (permalink)
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if its the fuel pressure how do i check it..

can i just remove the rev limiter?...


im just gonna check the timing
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Old 01-04-2005, 07:49 AM   #5 (permalink)
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The rev limit is electronically controlled. Most chip swaps remove that. To be honest, I could never understand the limit on the 3s. My '86 325es redlines at 4500, but my old 533 redlined at 5500.
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Old 01-04-2005, 09:12 AM   #6 (permalink)
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get a tuneup?
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Old 01-04-2005, 09:14 AM   #7 (permalink)
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and if you have a 325i convertible, and its an e36, then your rev limiter will not kick in until 6500 rpm
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Old 01-04-2005, 10:08 AM   #8 (permalink)
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is it possible that the rev limiter is broken?
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Old 01-04-2005, 02:54 PM   #9 (permalink)
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if its the fuel pressure how do i check it..
Is it backfiring at the upper RPMs too? That is a sign of the engine running too lean (not enough fuel) and/or too far advanced.

You can check the fuel pressure by buying a fuel pressure test kit at any local auto parts store. attach it to the Schrader valve on your fuel line and see if it is in spec. (not sure of the spec on BMW's, I know my car needs at least 55psi to run properly)
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Old 01-04-2005, 03:24 PM   #10 (permalink)
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no, the rev limiter is computerized, unless the previous mysteriously reprogrammed the computer chip its not possible, check into the fuel pressure problems
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Old 01-04-2005, 05:03 PM   #11 (permalink)
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im going to check the fuel pressure and see if its too far advanced today... it just seems to choke at about 5000rpm and the "check engine" light comes on for a second . Once in a while tho it shifts near the red line shown on the tach 6250rpm (estimate)
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Old 01-04-2005, 07:56 PM   #12 (permalink)
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MORE THAN LIKELY IS YOUR FUEL PRESSURE REGULATOR, FAIRLY INEXPENSIVE.. EASY FIX.. I AM SURE THAT IT HAS NOTHING TO DO WITH YOUR REV LIMITER THOUGH
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Old 01-04-2005, 09:22 PM   #13 (permalink)
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alright thanks
ill be checking the pressure tomorrow... they had to order a test kit (small stupid store)
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Old 01-04-2005, 09:59 PM   #14 (permalink)
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GOOD LUCK WITH THAT!
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Old 01-06-2005, 11:39 AM   #15 (permalink)
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Originally posted by Hypnogaja@Jan 4 2005, 03:54 PM
You can check the fuel pressure by buying a fuel pressure test kit at any local auto parts store. attach it to the Schrader valve on your fuel line and see if it is in spec. (not sure of the spec on BMW's, I know my car needs at least 55psi to run properly)
[snapback]264166[/snapback]
There is no schraeder valve on the fuel line of an m20. You can put a t-fitting in the line and use a gauge if you want though.


I have a brand new factory 3.0 bar fuel regulator for sale that I got at the dealer. I ran it for a week before my new adjustable FPR came in.

Let me know if you need one.
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