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Old 12-01-2014, 03:08 PM   #1
Thearchitect
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m42 trouble shooting

91 e30 318 ic m42

gas issue.

So I rebuilt my engine in March and she runs perfect. just when I start her in the morning it takes a few to many turn overs, is it my fuel not getting to my engine? Or filter clogged, fuel injectors needing to be replace?

First thing in a summer morning some times it takes 4-5 turn overs. but if I drive it for 30 km and not let it sit very long she starts perfect.

My one friend thinks it when running it for a while it runs the fuel dry, but short distances its supply is acquitted.
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Old 12-01-2014, 04:16 PM   #2
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possible, the fuel pump could be on the way out. they usually last about 200k and then start giving trouble.
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Old 12-01-2014, 04:28 PM   #3
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Try cycling the key on and off several times before cranking it over. If its low fuel pressure that should make a difference and help to diagnoise.
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Old 12-01-2014, 04:53 PM   #4
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I tryed the on of on off and it didnt seem to do much. when the key is turned i hear the pump doing its thing.
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Old 12-02-2014, 12:06 PM   #5
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When you say 4-5 turn overs do you mean revolutions? In other words it starts with one turn of the key but cranks 4-5 revolutions before it fires up. My old M42 started that way for ten years. When it does first start how does it run? Have you tried playing with the gas pedal position while cranking it?
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Old 12-02-2014, 01:10 PM   #6
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When the starters in these have a lot of cycles in them they tend to crank pretty slow (200k+). If the starter is original I'd be willing to bet it's the cause of your slow starts.
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Old 12-02-2014, 01:27 PM   #7
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I agree with that in a way as I just replaced the starter on said E36. I think it's way faster but similar in the number of revolutions ...but I'll take special note next time.
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Old 12-02-2014, 02:50 PM   #8
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When starting there car. it takes either 3+ engagements to start it or let it turn over like 6 times and then try re turning over.

yes i tryed the gas part nothing different.
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Old 12-02-2014, 03:27 PM   #9
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And again how does it run when it first finally starts? Does the fast idle work? Does it sputter?
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Old 12-02-2014, 04:28 PM   #10
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If its misfiring upon start up its your coils. One of them at least is bad.
hard start can be down to many things though but i would start by geting some fuel cleaner in there and new plugs
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Old 12-02-2014, 04:39 PM   #11
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And again how does it run when it first finally starts? Does the fast idle work? Does it sputter?
Sorry miss that question. it runs smooth idles at 800 and runs really good and clean.

its just when starting you have to let it turn over and over and over. or turn over and then repeat
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Old 12-02-2014, 04:40 PM   #12
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If its misfiring upon start up its your coils. One of them at least is bad.
hard start can be down to many things though but i would start by geting some fuel cleaner in there and new plugs
no miss firing clean run.
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Old 12-03-2014, 08:34 AM   #13
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no miss firing clean run.
Have you changed plugs? If not then do that first. Then clean the throttle butterfly. While at it use some additive for fuel system cleaning. I would also change the fuel filter if you have never done it.
All the above are quite cheap and DIY friendly. Plus your car will run better anyway.

If that doesnt help then i can only assume your battery may be weak. I would not think its the starter itself as i have seen them run perfect of 400.000km cars. If they fail its usually no start at all. Hence why i mentioned the battery. It could be that your battery does not hold charge well. That is why after you drive for a bit its ok since it has charged a bit.
I know this is not a straight answer but unless i see the car in person I can not give a straight answer.
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Last edited by magnus; 12-03-2014 at 08:38 AM.
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Old 12-03-2014, 10:26 AM   #14
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Have you changed plugs? If not then do that first. Then clean the throttle butterfly. While at it use some additive for fuel system cleaning. I would also change the fuel filter if you have never done it.
All the above are quite cheap and DIY friendly. Plus your car will run better anyway.

If that doesnt help then i can only assume your battery may be weak. I would not think its the starter itself as i have seen them run perfect of 400.000km cars. If they fail its usually no start at all. Hence why i mentioned the battery. It could be that your battery does not hold charge well. That is why after you drive for a bit its ok since it has charged a bit.
I know this is not a straight answer but unless i see the car in person I can not give a straight answer.
I swapped the plugs when i got the car, theirs only 5000kms on them. i do want to replace the fuel filter I will be doing so this on the weekend. I'm not sure its the batter cause it does turn over full sound. its not a slow turn over its loud and normal. but ill check what its volts read out is and see what its doing.
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Old 12-03-2014, 11:01 AM   #15
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Really does sound like a fuel delivery / pressure problem. It should also fast idle if its cold which might indicate an IAC Valve issue ...or its two problems. You need to test the fuel pressure first I think.
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