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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 06-03-2009, 04:51 PM   #1 (permalink)
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87 325es - Surging through acceleration

I have only had the car a week so I was hoping it was bad gas from Arco or something...but I am now halfway through a tank of Chevron 89 octane with a full bottle of Techron and still find this behavior. It is most noticable between 30-45 mph. As I accelerate normally with about 1800-2000 rpms...you can feel the slight surge of say 50-100 rpm. Once I hit 50 and am in 4th gear it is not noticable at all. I have also noticed this very easily going up hills. Any suggestions? New fuel filter? New fuel pump? Chip issues? Thanks, Ted
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Old 06-03-2009, 04:53 PM   #2 (permalink)
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oops, the surge continues every couple seconds from 30-45mph...it is not just a one-time event
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Old 06-03-2009, 07:09 PM   #3 (permalink)
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Are you sure the ignition system is all in good shape?
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Old 06-03-2009, 11:25 PM   #4 (permalink)
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I don't know if the ignition is in good shape. I have done nothing mechnical to the car yet as I drive it and try to document the issues and look to my friends here for some ideas. It seems to run smooth at idle and in early acceleration. Do you have some suggestions? Any...'test this to eliminate that' ideas?
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Old 06-03-2009, 11:39 PM   #5 (permalink)
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The distributor and wires to plugs, it's amazing the issues those cause.
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Old 06-04-2009, 10:24 AM   #6 (permalink)
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Thanks, I just spoke to the prev owner and he said it has been 7 years since the dist/plugs/wires have been replaced. I will let you know how it goes.
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Old 06-04-2009, 10:39 AM   #7 (permalink)
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Ran across this today...sounds like confirmation on doing a replace on the ignition stuff.

Engine Troubleshooting - Diagnosing Driveability Problems - Engine Stalling, Hesitation, Surging
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Old 06-04-2009, 10:42 AM   #8 (permalink)
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Good luck!
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Old 06-04-2009, 03:04 PM   #9 (permalink)
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Planning on starting with Cap/Rotor...agreed? It would be nice to slowly change portions and find the cause to delay a complete update. Thoughts?
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Old 06-04-2009, 03:06 PM   #10 (permalink)
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Sounds fine, I'd imagine everything should be replaced.
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Old 06-04-2009, 03:13 PM   #11 (permalink)
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Yeah, unfortunately that might be true. Replace coil too? I was figuring that might not be the source of my issue...I have only changed coils when I had a spark to start issue. Thoughts?
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Old 06-04-2009, 03:15 PM   #12 (permalink)
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AFAIK, the coil either works or doesn't. But I think I'd replace it as well.
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Old 06-05-2009, 01:14 AM   #13 (permalink)
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sorry, i forgot to mention...my coolant warning light is on and the coolant is plenty full. I only mention this now as I was reading another thread about surging issuues and they were discussion the coolant sensor as a possible issue for this guys surging issue...thoughts?
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Old 06-05-2009, 08:47 AM   #14 (permalink)
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AFAIK, the coolant sensor should have no role in a surging issue.
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Old 06-08-2009, 01:56 PM   #15 (permalink)
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In discussing this item with a local mechanic and the parts guy...they point at the o2 sensor or the sensor that manages the fuel rich/lean. Any thoughts? Yep, i still have not attempted to fix this as I am waiting for my repair manual. The car is fairly guttless as it sits...which is surprising for a 6 cyl...are these cars supposed to be peppy?
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