» Site Navigation | | » Recent Threads | | | 1999 M3 Swap 09-07-2023 10:10 PM 06-01-2024 03:04 PM 7 Replies, 429,836 Views | | | | | | 10-04-2013, 06:26 PM | #1 | Member Join Date: Jun 2008 Location: Cocoa, FL Posts: 73 | Engine acts like it timing chain skipped Engine spins but won't start. It spins rapidly, sounds like engines I've heard with a damaged timing belt. I removed the cam cover, checked the cam timing and it is good. The car ran normally before this happened. Cold compression check is about 70 psi per cylinder, they are all about the same. I realize that this is way low. The coil appears to be bad as well, 0 ohms of resistance on all 4 primary coils. I don't really have the equipment for a leakdown check available. This is for a 97 ti with the M44. Is there something I'm missing here? This all seems to point to bent valves or something along those lines but there is no evidence of skipped time. Any thoughts? __________________ | | | 10-05-2013, 02:10 AM | #2 | Senior Member Join Date: May 2010 Location: Montreal Posts: 283 | Check with xxxjohnboyxxx , He's in florida also and should be good with this.. | | | 10-06-2013, 02:42 PM | #3 | Junior Member Join Date: Jul 2013 Location: Houston Texas. Posts: 26 | A flooded cylinders (with fuel) can cause your issue as well, we call it cylinder washdown, disable the fuel pump or disconnect all 4 injectors and crank it for a few seconds with the spark plugs removes, then pour abut two ounces of engine oil in each cylinder and let it sit for a few minutes. Then crank it again for about 10 seconds and recheck compression, if it rises, it was washdown, if it doesn't it may be cams off time. BTW, I don't thing it has bent valves, if that was the case it would have zero compression. | | | 10-06-2013, 07:32 PM | #4 | Member Join Date: Jun 2008 Location: Cocoa, FL Posts: 73 | That sounds possible. It appears the coil is bad. It would make sense that if there was no spark, the fuel would not ignite and possibly wash down the cylinder. That is the first time I've ever heard of wash down. It will be really interesting to see what happens when the new coil shows up. Thanks! __________________ Last edited by Entropyman; 10-07-2013 at 01:08 AM. | | | 10-06-2013, 09:49 PM | #5 | Junior Member Join Date: Jul 2013 Location: Houston Texas. Posts: 26 | Ive seen washdown a bunch of times at the shop, most of the times is something simple to fix, some others have been so severe the cylinder wall gets scored so bad one we get the engine running again it burns oil, but those are extreme cases. | | | 10-08-2013, 10:07 PM | #6 | Member Join Date: Jun 2008 Location: Cocoa, FL Posts: 73 | The new coil fixed it. It took some cranking but it finally caught, ran like crap briefly, and then settled down. Runs perfect now. Thanks for your help! I was about to start tearing the front cover off. You saved me a bunch of work. __________________ | | | | Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | | Posting Rules | You may not post new threads You may not post replies You may not post attachments You may not edit your posts HTML code is Off | | | |
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