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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 07-12-2009, 02:55 PM   #1 (permalink)
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'88 325i Engine Will Not Rev

If you mash the butterfly on the intake it will die or cut out .if you move it slow it will rev? Any ideas?
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Old 07-12-2009, 08:08 PM   #2 (permalink)
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yeah, I have an 88 325i just did a valve adjustment this morning. Mine has 175K miles on it and runs great. When was the last time a complete tune up was done? Major tune up means new plugs, cap, rotor, wires, fuel and air filter as well as a valve adjustment. I bet that would fix the issue. It always has on mine. Other than having coolant or oil leaks that are visable, which mine does not, that should do the trick....figure $300 for parts if you do it yourself, $700 if you take to a shop....good luck...cliff
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Old 07-12-2009, 09:31 PM   #3 (permalink)
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Not sure on the tune up just got the car?Im going to try that first. It just wont rev fast cuts out or will die.
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Old 07-12-2009, 10:46 PM   #4 (permalink)
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actually, if had pick one thing first I would say fuel filter, but that seems too obvious I reckon.....but I swear, without some visable check engine code kind of thing or light I would just tune the darn thing up, lacking any other specific kind of error codes. the damn thing tattles on itself for damn no reason, brake light out, low coolant, whatever. If you have no telltale warning lights or check engine what else could it be? I swear that the 1988 BMW 325i engine is damn near bullet proof...possibly the best 6 ever built...and I mean this. Mine won't even leak or burn oil....ever...and I am serious, it has 175K miles on it and is still a monster....it's goofy how excellent this engine is.......
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Old 07-13-2009, 12:31 PM   #5 (permalink)
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Yea im thinking valves need ajusting.
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Old 07-13-2009, 07:34 PM   #6 (permalink)
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yeah, but I don't think it's valves...they may need adjusting but that wouldn't cause your issue...it sounds as if it's fuel delivery related. I would start with the fuel filter and work from there, myself....good luck
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Old 07-14-2009, 05:25 PM   #7 (permalink)
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Well ok ill start from there,I was told the car sat for a while.Whats the spark plug gap on a 88 325i engine 2.5
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Old 07-14-2009, 08:22 PM   #8 (permalink)
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Bosch plugs are, and have been for a while, pregaped (look at the sticker on the end of each box, it'll say the gap and it is always correct) and do not require any adjustment. In fact, I wouldn't touch them at all other than putting the required fresh coat of new motor oil on the threads before installing them. Just coat the threads and screw em in...best of luck...cliff
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Old 07-15-2009, 11:59 AM   #9 (permalink)
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Just wondering in case i dont use bosch plugs in it?
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Old 07-15-2009, 09:01 PM   #10 (permalink)
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well just in case, don't don't use Bosche plugs or any other part...every thing else is junk....if it calls for Bosche, use Bosche...it's just that simple...don't even consider anything else for these cars....it's false economy to the max....
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Old 07-24-2009, 01:14 PM   #11 (permalink)
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Ok i think i found the problem,Im not getting any power to my air box plug.Any ideas?
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Old 07-24-2009, 08:50 PM   #12 (permalink)
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yeah, here's an idea...take the airbox (whatever you mean by that) and see if the engine works right.....there is no way that an airbox (filter) will cause your problem...just take it off and see...power to your airbox? what the heck does that even mean? a powered airbox? i gotta say i have been working on BMWs for 25 years and have never, ever heard the phrase 'powered airbox'..really...that is kind of humorous to me personally...
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Old 07-25-2009, 12:11 AM   #13 (permalink)
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Well it could be a MAF connection issue. Air filter box, something like that. Maybe.
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Old 07-26-2009, 12:35 PM   #14 (permalink)
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The pigtail that plugs into the maf No power there,Or coming out of the ecu to it.
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Old 07-28-2009, 06:57 PM   #15 (permalink)
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theres your problem then, I had the same thing wrong with my vw one time, the maf came loose and popped off, idled but no rev. I remember someone saying something about cancer(the wires roting and grounding out) but that was from a crappy source. just take your test light and move up the wire until you find power.
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