Codes P1640, and P1406 and little boost - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-06-2006, 01:10 PM   #11
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yes I do have a series one. It'* a 94. And yes I have cleared the codes
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Old 03-06-2006, 01:33 PM   #12
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ok I'm finally getting some boost. NOw the problem seems that it bogs down at wide open throttle and when I back off it runs great. I cleared the egr code but i'm still wondeirng if it'* the egr valve?
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Old 03-06-2006, 01:49 PM   #13
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About what RPM range is it bogging down at?
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Old 03-06-2006, 01:53 PM   #14
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not really RPM related boging. It'* more dependant on how far the throttle is opening.
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Old 03-06-2006, 02:15 PM   #15
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Quote:
Originally Posted by LakevilleSSEi
About what RPM range is it bogging down at?
I bet Nate is thinking older possibly dead catalytic converter.
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Old 03-06-2006, 02:18 PM   #16
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Quote:
Originally Posted by BillBoost37
Quote:
Originally Posted by LakevilleSSEi
About what RPM range is it bogging down at?
I bet Nate is thinking older possibly dead catalytic converter.
Or Fuel Pump.
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Old 03-06-2006, 05:44 PM   #17
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cats not the problem. I tested fuel pressure today and I'm only getting 30-35lbs. So i'm thinking my pump is dying.
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Old 03-06-2006, 07:31 PM   #18
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It'* about time on the pump. Let'* get a key on/ignition off check, then idle, then idle with the vac line pulled off the regulator.

My 93 already has a new one, and my 95 is due.
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Old 03-06-2006, 08:30 PM   #19
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The key on key off pressure was low also. I can't remember the exact number. So what replacement pump should I go with. I'm planning on modding this motor eventually so I'll want the best pump.
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Old 03-06-2006, 08:33 PM   #20
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Stock pump will support 400hp (crank). Buy whichever you find cheaper. Either AC Delco or Walbro.
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