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-   -   Engine acts like it timing chain skipped (http://www.318ti.org/forum/showthread.php?t=39210)

Entropyman 10-04-2013 06:26 PM

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?

mtlblue 10-05-2013 02:10 AM

Check with xxxjohnboyxxx , He's in florida also and should be good with this..

HotChickenStrips 10-06-2013 02:42 PM

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.

Entropyman 10-06-2013 07:32 PM

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!

HotChickenStrips 10-06-2013 09:49 PM

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.

Entropyman 10-08-2013 10:07 PM

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.


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