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No power

Tiny
MARK FRIZZELL
  • MEMBER
  • 2009 GMC ACADIA
  • 3.6L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 104,145 MILES
No codes, with scanner I found right catalytic converter was clogged so replaced that fixed that issue. Thought that fixed the issue it did not. Still bogs down on acceleration. Check fuel pressure at rail is 63 psi. Since I have no codes and fuel pressure, and catalytic converters aren't clogged now, I'm a little lost. MAF is 4.89 at idle
And 20 m at 1500 rpm's so I don't which direction to go now. Can you help?

Mark Frizzell
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Thursday, May 16th, 2019 AT 8:42 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

The next step would be compression to verify timing between cam and crank.

Do a compression test or pull the front cover to verify the timing marks

Roy
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Thursday, May 16th, 2019 AT 8:50 AM
Tiny
MARK FRIZZELL
  • MEMBER
  • 141 POSTS
It's starts great, idles great. Scanner indicates cam and crank are in sync.
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Friday, May 17th, 2019 AT 5:07 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would still check the compression to be sure.

Roy
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Friday, May 17th, 2019 AT 5:16 AM

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