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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 11-30-2012, 05:06 PM
HicksLJames HicksLJames is offline
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89 E30 with M20 intermittent misfire

Hey everyone my car is been having some problems lately... Mostly when Im crusing on the freeway or under high load the car misses one cylinder. I pulled the car around and started to do some diagnostics. I started at the Ign Coil and ohmed the primary and secondary circuits .53 and 6100 ohms which is normal. I pulled the spark plugs (E3's which could be the problem IMO) wires (almost 0 ohms on all which is normal), and the rotor (cleaned the posts up). I put it all back together and test drove it. The problem was still there but not as apparent... The problem feels like a ign cut because its so sudden and not just a loss off power like a fuel cut problem. Im going to buy some NGK-R's on Monday to see if its those ****ty plugs but other than that Im at my wits end and would appreciate and input or help. Thanks!!!
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  #2  
Old 11-30-2012, 06:33 PM
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downhiller downhiller is offline
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e3 plugs a problem? you will be the first i hear that from. have you checked the crank sensor yet?
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  #3  
Old 11-30-2012, 06:50 PM
SWISS SWISS is offline
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M20's like old school copper core plugs...
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  #4  
Old 11-30-2012, 06:54 PM
WickedFast.Inc WickedFast.Inc is offline
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Check for spark at each plug +1 on crank sensor check fuel pressures fuel pressure reg

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  #5  
Old 12-01-2012, 06:03 AM
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BMWFatherFigure BMWFatherFigure is offline
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If it only misses one cylinder do a compression and leak down test. Is a plug lead shorting out?
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  #6  
Old 12-01-2012, 10:54 AM
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Newman271 Newman271 is online now
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please don't buy ngk's.. you will notice things will get worse.
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  #7  
Old 12-01-2012, 05:14 PM
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Quote:
Originally Posted by Newman271 View Post
please don't buy ngk's.. you will notice things will get worse.
i dont see any logic in that statement. the only 2 plugs i ran where the u-power ngk and u-groove denso. those are by far 2 of the best companies for spark plugs.
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  #8  
Old 12-01-2012, 05:34 PM
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spark plug leads should be about 5kOhms, not 0 ohms. Im going to call you out and say you havent tested those.
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  #9  
Old 12-02-2012, 01:04 PM
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Originally Posted by _Ethrty-Andy_ View Post
spark plug leads should be about 5kOhms, not 0 ohms. Im going to call you out and say you havent tested those.
maybe he ran continuity instead of ohms.
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  #10  
Old 12-03-2012, 01:04 AM
HicksLJames HicksLJames is offline
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Hey Guys! So I tossed those sad excuses of spark plugs and put is some NGK-R's and test drove it. MUCH better but problem still apparent. after a second of pondering I had a theory. I bought the car used and I am damn sure that the previous owner did have the gall to bite the bullet and buy some damn spark plug wires... so I pulled the loom off the valve cover and cracked that sucker open.. ALAS!!!!! carbon tracks from the old plug wires crossfiring under heavy loads! so I manned up and just dropped the hundred for the wires and installed them. Test drove the car and now its running like a champ! now I gotta tackle the oil in on the filter and in the intake boot, intake manifold and such but thats not on the top of my list. Im thinking CCV and I plan on replacing the hose after I get paid tomorrow. And also I have a 1222 DTC for the O2 sensor. and I understand that the O2 sensor just measures oxygen and something can cause the Rich/Lean code to appear I just want a second opinion on wether it would be a good idea to start at the O2 and just get it outta the way so if its something else I can move on. Or maybe a wideband...... hmmmmmmmm and advice would be much appreciated -M POWER-
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  #11  
Old 12-03-2012, 10:09 AM
HicksLJames HicksLJames is offline
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And whatever specification that I got for the spark plug wires was off of AllData. hmmm maybe they made a mistake
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  #12  
Old 12-03-2012, 06:50 PM
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downhiller downhiller is offline
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Quote:
This wire typically has a resistance of 3,000 to 20,000 ohms /ft. depending on the manufacturer.
http://www.auroraelectronics.com/Und...ug%20Wires.htm

also, you cant blame the spark plugs when the wires were shot. grant it e3s may not be the best choice for the e30s, but they still out perform alot of spark plugs. its a proven fact but many second hand testing companies.
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  #13  
Old 12-03-2012, 09:35 PM
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Quote:
Originally Posted by _Ethrty-Andy_ View Post
spark plug leads should be about 5kOhms, not 0 ohms. Im going to call you out and say you havent tested those.
Quote:
Originally Posted by HicksLJames View Post
And whatever specification that I got for the spark plug wires was off of AllData. hmmm maybe they made a mistake
Sorry, just reread that, i sound like a bit of a **** there, i didnt mean to!
You should be able to read the resistance on the side of the lead if they are genuine/oem leads in there currently.

Quote:
Originally Posted by HicksLJames View Post
now I gotta tackle the oil in on the filter and in the intake boot, intake manifold and such but thats not on the top of my list. Im thinking CCV and I plan on replacing the hose after I get paid tomorrow. And also I have a 1222 DTC for the O2 sensor. and I understand that the O2 sensor just measures oxygen and something can cause the Rich/Lean code to appear I just want a second opinion on wether it would be a good idea to start at the O2 and just get it outta the way so if its something else I can move on. Or maybe a wideband...... hmmmmmmmm and advice would be much appreciated -M POWER-
I think i missed something, i tried reading above again but alas no, what do you want us to diagnose?
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  #14  
Old 12-04-2012, 03:16 PM
HicksLJames HicksLJames is offline
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well the new plugs and wires helped alot. the inly reson I got the E3s was becuase they didnt have NGK plugs at the time so I got them pretty cheap they just dont work for me I guess. My E30 does have a pretty terrible idle and it throws that 1222 code whenever it is idling at a stop. after I take off the weak idle goes away and the car runs like a champ. I have heard of pulling off my Idle Control Valve and giving it a good cleaning. I also have oil being pulled into my intake. theres oil on my air filter and all up in my throttle body and everywhere. First thuing that comes to mind is PCV but I just wanted to get some second opinions on what it could be. Im not trying to shotgun parts into the thing....
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  #15  
Old 12-04-2012, 05:13 PM
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downhiller downhiller is offline
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oil in the intake, too much bypass gases. which on these cars tends to lead to bad rings. and if i remember correctly, these do not have a pcv. there is a tube that goes from the underside of the intake to just above the oil pan.
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  #16  
Old 12-10-2012, 01:31 PM
HicksLJames HicksLJames is offline
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Eureka! Crank Sensor CAKED with gunk. Cleaned it up put it back. No more misfire, O2 code, and it idles like its supposed to now =D
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  #17  
Old 12-10-2012, 05:05 PM
WickedFast.Inc WickedFast.Inc is offline
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+10 for another solved

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drivability problem, ignition problem, misfire on cyl, misfiring, stutter


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