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E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 01-12-2013, 04:21 AM
Luke1985 Luke1985 is offline
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Location: Cornwall U.K
 
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Mein Auto: 1989 318i e30
Misfiring.....

Hi All,

My 89' 318i is missing at low revs, I've tried a lot of things including, new plugs, new leads, new coil, new battery, checked distributor, replaced vacuum hoses, (although not sure if I did them all but the two I can see are done)

I'm now lost as it is still missing but as you go higher up the range the misfire stops.

Does anyone have any suggestions? Help/advice would be greatly appreciated!

Thanks in advance....
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  #2  
Old 01-12-2013, 05:56 AM
Billwill Billwill is offline
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Mein Auto: BMW E30 318i 1991
Quote:
Originally Posted by Luke1985 View Post
Hi All,

My 89' 318i is missing at low revs, I've tried a lot of things including, new plugs, new leads, new coil, new battery, checked distributor, replaced vacuum hoses, (although not sure if I did them all but the two I can see are done)

I'm now lost as it is still missing but as you go higher up the range the misfire stops.

Does anyone have any suggestions? Help/advice would be greatly appreciated!

Thanks in advance....
I presume this is the 318i M40?

Only use the NGK spark plugs...strangely the E30 does not like Bosch plugs.
If you replaced the leads...did you get OEM ones with the extra lead wrapped around lead number 4 to set the timing? It will run without that extra lead but not as good.

You need to spray some Carb Cleaner around all the hoses and gaskets in the inlet area to look for air leaks...very common on an M40.

Could be the AFM, the camshaft timing or camshaft wear.

You need to have a look at the cam belt to check its condition and check the cam timing while you are about it.

The best site for advise on the M40 318i is the UK site:http://www.e30zone.net
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  #3  
Old 01-12-2013, 06:08 AM
Luke1985 Luke1985 is offline
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Location: Cornwall U.K
 
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Mein Auto: 1989 318i e30
Thanks for that,

I used Bosch super 4's and non oem leads, updated 8mm... The car was running poorly before I replaced plugs and leads and the cid you described broke....oem leads are seriously expensive but did not realise replacements would be a problem otherwise would have paid the amount.

Am going to get the timing looked at to see if that's the issue and will check for leaks....

The miss does disappear when you rev the engine up...

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  #4  
Old 01-12-2013, 06:26 AM
Luke1985 Luke1985 is offline
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And yes its the m40 motor.

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  #5  
Old 01-12-2013, 11:19 PM
Billwill Billwill is offline
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Mein Auto: BMW E30 318i 1991
Quote:
Originally Posted by Luke1985 View Post
And yes its the m40 motor.

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The e30zone site has a good Wikki on the M40 and also on replacing/timing the cambelt
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  #6  
Old 01-13-2013, 03:27 AM
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BMWFatherFigure BMWFatherFigure is offline
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Mein Auto: E23;E30;E38;E32;E34 +
It could be the miss-fire is masked at higher speed rather than going away. Also get injector clean (on a rig, not in a can). Check FPR hoses and unit for vacuum leaks.
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  #7  
Old 01-13-2013, 12:44 PM
Luke1985 Luke1985 is offline
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Location: Cornwall U.K
 
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Mein Auto: 1989 318i e30
Looking at it today...took lead 4 off and no change in engine idle, thinking it may be an injector and as you said bmwfatherfigure higher revs may have been masking it. Will try replacing this injector. Have a good spark and when I removed plug it was damp...maybe not enough fuel getting through...

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  #8  
Old 01-13-2013, 03:48 PM
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hornhospital hornhospital is offline
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If the plug was wet it's getting too much fuel or that plug isn't firing.
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Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
BMW-CCA #441426
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?

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  #9  
Old 01-13-2013, 09:45 PM
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BMWFatherFigure BMWFatherFigure is offline
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+1 Ken. If one injector is bad get them all cleaned and flow tested.
__________________
Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i

Last edited by BMWFatherFigure; 01-13-2013 at 09:47 PM.
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  #10  
Old 01-13-2013, 11:59 PM
Luke1985 Luke1985 is offline
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Location: Cornwall U.K
 
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Mein Auto: 1989 318i e30
Thanks all for continued support...got 4 recon injectors on the way...

Also I'm going to replace fpr for piece of mind as I've got one available to me for free.



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  #11  
Old 01-14-2013, 03:29 AM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
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Mein Auto: E23;E30;E38;E32;E34 +
Recon is good if from a reliable source. Hope it fixes things up..
__________________
Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
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  #12  
Old 01-14-2013, 05:55 AM
7pilot 7pilot is offline
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Quote:
Originally Posted by hornhospital View Post
If the plug was wet it's getting too much fuel or that plug isn't firing.
Or that the injector is spraying a stream of non atomized fuel...which won't burn.

m
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  #13  
Old 01-14-2013, 11:15 AM
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hornhospital hornhospital is offline
D'oh, You kids!
Location: In the Grumpy Chair
 
Join Date: Jan 2008
Posts: 14,315
Mein Auto: 1995 318is / 1993 325is
True.
__________________
Quotes to live by:
guessing gets expensive...drivinfaster
nothing is more expensive than a cheap BMW...c4harpe13

Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
BMW-CCA #441426
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?

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  #14  
Old 01-14-2013, 01:03 PM
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BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,311
Mein Auto: E23;E30;E38;E32;E34 +
Is there a spark going to #4?
__________________
Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
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  #15  
Old 01-22-2013, 09:35 AM
Luke1985 Luke1985 is offline
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Location: Cornwall U.K
 
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Mein Auto: 1989 318i e30
Resolved

Thanks all,

I have resolved the issue, decided there must be something wrong with injectors, took everything off, got to number 4 and as I withdrew it it was carbon city and the jet fell off! Coupled with a blown out lower manifold gasket and seriously unhealthy looking icv I realised where the issues were.

Fitted four recon injectors, cleaned icv (extensively), replaced gasket put it all back together and TA DA! Perfect.

Thank you so much for your suggestions and theories all this info helped me a lot!

Luke
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