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DISCUSSION => Engine + Driveline => Topic started by: dlmrun2002 on April 07, 2007, 04:30:31 PM

Title: engine install-coil pack question
Post by: dlmrun2002 on April 07, 2007, 04:30:31 PM

So  I fianlly got my new rebuilt engine all hooked. She popped right away and that is about it. Keeps popping  and  some backfiring. Just tested my new magnecor wires. All look  good   Fire order 1342. Even jumped in extra set of wires that are numbered and still in the old wire loom. I am wondering if the  coil pack connectors might be switched. I had them out when I painted the engine bay last fall.  Any way to tell by the wire harness for the coil packs or the individual connectors themselves  which coil they go to?  The back fire leads me to believe maybe one is firng when the exhaust valve is open.  Any input would help. It's  been along journey of almost a year. I want this little revver to  purrrrrrrrr.
Thanks

DLM

PS. I figured howto maintain original wire harness  with Magnecor 8.5 mm wires. I ran wire #4  thru side of wire loom,coming off of cylinder haed. Just a little snip on the  plastic gave the length  and room I needed.

Title: Nevermind
Post by: dlmrun2002 on April 07, 2007, 08:17:23 PM

Nevermind. It was a crossed sparkplug wire...  Minus that  it went flawlessly..  She is running great minus cooling system bleed. Now  for the EZ stuff---------brakes-suspension..And I get to paint it too!!
DLM

Title: engine install-coil pack question
Post by: bmwman91 on April 08, 2007, 11:43:57 AM

Glad you figured it out.  It can be a real pain to figure out which connector goes to which coil sometimes.  Good luck with the rest of the rebuild!

Title: engine install-coil pack question
Post by: dlmrun2002 on April 08, 2007, 01:49:09 PM

She's running  solid.  Obviously since it's been a year,  I suspect the service interval batteries  are dirt napping-dead. Thus no tach  and economy gauge. Seems  to be idling high. Not sure how high since I have no tach. And when it warms up it gets to a point where  the engine idle  oscillates  every 2 second  approximately.  I'm  thinking 02  sensor but I just started looking into it.  Any input woul dbe greatly appreciated. Oustdide  of that, she  is solid ,no oil leaks,no prestone leeks, warms up nicely and holds steady  temperature.

Title: engine install-coil pack question
Post by: bmwman91 on April 08, 2007, 02:13:05 PM

The crappy idle is usually due to a couple things.  I guess without a gauge cluster it could be tougher to troubleshoot.  How long does it warm up before idling badly?  It could be the O2 sensor depending on that.

Title: engine install-coil pack question
Post by: dlmrun2002 on April 08, 2007, 02:41:53 PM

Well  after a few minutes it starts to  vary.  My tach is back. Blown fuse.  It is oscillating between  1500  and 1800  rpm. Idling high to Around 1200 rpm..