Just recently my 89 325i has been running rough at idle. I put M50 injectors in a couple months ago and it was running great after I installed those. Idled very smooth all the time. Seems to idle fine when its nice and hot (operating temp). I've been thinking I need to do a valve adjustment since I've had the car for a couple years now and haven't done it yet but I don't think that could cause a rough idle when cold. Another thought is winter gas having an affect on how the car runs and it being colder in the mornings. Any other suggestions what to check? Car came with a Dinan chip as well.
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I forgot to mention I also changed out all the intake hoses, the intake boot, the intake itself, put new intake manifold gaskets in, the WORKS back in September or so. So its not intake leaks, unless it just happened to come up. -
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It idles low if anything. Wouldn't intake leaks cause a high idle?Originally posted by dnguyen1963 View PostComment
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Hey Brian, dealing with a similar issue on my 88. Except it's rough idle all the time for me. Had a shop run some diagnostics and I'm 1.5 bar lower than I should be apparently. Replacing the fuel pump seems my best option. I can let you know how that goesComment
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Have you looked at your plugs to see if they are rich?Comment
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a new fuel pump aint going to do shit for your problem. the pressure is kept at 3bar (or 2.5bar if youre an eta) by the fuel pressure regulator. cheaper and easier to replace than a fuel pump.Originally posted by Anfield85 View PostComment
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Well this problem has solved itself it seems
Maybe it was a bad tank of gas but its back to idling smooth again. I know the car needs a cap, rotor, plugs and wires though so thats my next project I need to save up for.
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