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1999 Porsche Boxster Question: Im not grtting ignition spark on # 4,5,6 cyls,

 

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enginedr03, Milledgeville, GA, July 12, 2011, 12:32
 Rookie

I installed head gasket on that side,I have 185 lbs compression and getting fuel im just not getting spark to 4,5,6, cylinders.Any ideas?

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    July 12, 2011, 12:39
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     Journeyman

    A couple things I wonder. Are those cylinders all on the same side? Do they get their spark from the same source? Does 1,2, and 3 get their spark from a different coil? Sounds like you had this torn down quite a ways. Just to cover the bases. Did you remove the coil? Did you plug it back in when you reinstalled it? not trying to be smart. Start with the easy stuff and work toward the harder stuff.

    I just saw that it is coil over. Try tracing the wiring harness from the coils to the source.

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    enginedr03, July 12, 2011, 14:15
     Rookie

    thank you for your reply.yes the no spark is on the same bank drivers side.tested each coil,tested good on ohms,not getting voltage to coils.the engine came to me torn down on the left bank head,cams,etc.I got it all together according to alldata instructions step by step,I turned the crank by hand 4 revolutions all went smooth. I started the engine and found # 4,5,6 cyl wasnt firing but is getting fuel.ran a compression test found 185 lbs on all cylinders.Replaced the cam sensor on that side still no firing on 4,5,6,bank

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    big01_dram, July 12, 2011, 14:28
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     Journeyman

    if you have access to alldata you should be able to find a troubleshooting guild for no spark. You have started in the right direction. Check to make sure the power is getting to the coil pack. The continue "upstream" from the coil until you find power. I can see 1 coil not working but not 3 all on the same side. Im thinking you have a problem closer in the direction of the computer. I dont suspect the computer mainly because you are getting some spark. Just follow that wire harness. it has to be there. I did an intake job once and pinched some wires to an injector. It got no signal so I has a miss. Simple mistake. Once I started following the wire I found the problem. Im hoping it is nothing more than this.

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