2005 Cadillac SRX return question-blow-back

SAHAG41

MEMBER
2005 CADILLAC SRX
3.6L
V6
AWD
AUTOMATIC
107,000 MILES

You have my previous question. Was not given a definitive answer. I know that if lower half of engine has an issue, heads may not fix the compression problem; however, my question was, "will the new heads give me blowback" thanks

Saturday, June 21st, 2014 AT 9:34 AM

3 Replies

HMAC300

MECHANIC
48,601 POSTS

Blowback normally doesn't come from the head area, it is usually bad piston rings that do that or stuck piston rings. Also a bad pcv system not working will also let pressure build up in engine. New heads may not fix the problem. Has a compression test and leakdown test been done?

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Saturday, June 21st, 2014 AT 9:42 AM

SAHAG41

MEMBER
8 POSTS

Thanks so much for your assistance. Compression test was done, but will now get a leak test to confirm problem. Will also change pcv valve. We will take it from there. I will keep you posted and compensate you for your help.

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Saturday, June 21st, 2014 AT 9:58 AM

HMAC300

MECHANIC
48,601 POSTS

What was compression? If a 20% variance between any cylinder then there is something wrong. The only possible way that blowby could be fixed with heads is if one or more of the valves were burnt. A leakdown test even with a burnt valve would not show piston ring problems because it couldn't build up pressure and hold it.

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Saturday, June 21st, 2014 AT 10:01 AM