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NO COMPRESSION ON CYLINDER # 1 850 1997

posted by  vesparally on  Sat Dec 30 19:59 CST 2017
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last visit: Tue Oct 21 18:11 CST 2014
[RELATED]


So I suddenly lose compression on cylinder # 1.

Brief history on car, cylinder #1 always had low compression (80, 140/oil), but he car ran fine until recently.

PCV system is clogged, bypassed for now with a vented oil fill cap.

Driving on the highway fine, get off, come to first stop light, engine running really rough, definitely not running on all cylinders.

Compression test reveals NO compression on cylinder # 1, NONE, not even a blip, even after adding oil.

Compression test with engine running (forgot to remove coil wire the first time) revealed compression around 60 psi. Is that why it seamed to run ok on the highway (but down on power) ?

Two codes, one for secondary air pump ??, other for cyl. #1 misfire. (soft code)
New sparkplug made no difference. Upon removal, no evidence of it running, plug clean/new.

Did I drop a valve ? Why some compression as running/idle speed ??

Car has 174K on it and is long overdue for a timing belt job, besides the PCV fix.
Is there anything else to check or did I just gain a parts car.

Thanks all.






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