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99 Boxster 140,000 miles, Chasing around P1123/1125 Codes... which... I think shows that the DME is leaned the engine to max. I pulled and sent out my fuel injectors for cleaning thinking they maybe causing too much gas into the mix.(leaking or dirty). Am I on the right track? If there was a vacuum leak I figured it wouldn't be leaned out cause there would be too much air in the mix. Already replaced AOS,MAF,fuel filter, cleaned plenum and Throttle body. Fuel pressure and FPR seem ok. Thanks Vince

Edited by vza
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3 hours ago, vza said:

99 Boxster 140,000 miles, Chasing around P1123/1125 Codes... which... I think shows that the DME is leaned the engine to max. I pulled and sent out my fuel injectors for cleaning thinking they maybe causing too much gas into the mix.(leaking or dirty). Am I on the right track? If there was a vacuum leak I figured it wouldn't be leaned out cause there would be too much air in the mix. Already replaced AOS, MAF,fuel filter, cleaned plenum and Throttle body. Fuel pressure and FPR seem ok. Thanks Vince

 

P1123 ands 1125 are bank codes for an overly rich condition, common issues are leaking injectors and fuel pressure is too high.  Diagnostics start with test fuel pressure (engine off: 3.8 bar +/- 0.2 bar; engine idling: 3.3 bar +/- 0.2 bar).  A vacuum leak on the line going to the fuel pressure regulator would also create problems, a vacuum gauge on that line should read 0.4-0.6 Bar.

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I did do that and all checked out.  My findings were:

Fuel press Engine off 3.3bar

Engine idle 3.1 bar

FPR .51 bar at idle,....... that's why I decided to send the injectors off. On the right track?.....you think? V

Edited by vza
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Your engine off fuel pressure is out of spec low (3.3 bar, spec is 3.8+/- 0.2, so the low limit is 3.6 bar).  You may have a regulator issue as the running pressure is also at the lower limits.

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  • 2 months later...

Just a follow up. Re-installed my serviced injectors (I think they were off by 2%) not sure what the tech jargon means and R/R my FPR. So far drove about 700 miles with no CEL. 

Hopefully cured!! V

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