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#29: 11-06-2009, 01:44 PM
 
 Underdog
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Title: Wrench for Hire
Location: Ayer, MA
Car: GRP '06 LGT/5MT; DBM '09 OBXT/5MT
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Injector/coilpack isn't going to fix the compression. Compression checks are the same regardless of engine layout: pull fuel pump fuse, plugs out, throttle open, compression tester hooked up to cylinder you want, crank it over.

The shop should have put a little 30wt oil in the cylinder and redone the compression check. If it improved slightly it's your rings, otherwise it's a valve. If both cylinders on the same bank are low it could be a head gasket.

Good luck!
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