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2000 GMC Safari When Hot outside and AC running engine will

Tiny
JCUTRIG
  • MEMBER
  • 2000 GMC SAFARI
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
When it is hot outside about 85 and we run the AC the van will slowly stop accelerating, starts off anything past 3/4 throttle and 1/2 and then anything other then an idle. After it cools down it runs fine again. This never happens in the cooler months. I have seen it happen when very hot outside even with the AC off, 95+.

I have a OBD2 software program that show an Fuel systems status or Open Fault when this occurs

I have jut replaced both the O2 sensors and the fuel filter and this did not resolve the issue.

Any ideas?
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Tuesday, August 4th, 2009 AT 12:17 PM

8 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
Would you post the codes in POxxx format
Thank You
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Wednesday, August 5th, 2009 AT 7:57 AM
Tiny
JCUTRIG
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  • 6 POSTS
I have a text file with the codes I am using a software product called OBD2. Com
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Wednesday, August 5th, 2009 AT 9:45 AM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Is Check engine light on? If yes can you get to an Auto Zone and have codes read. If no check fuel pressure cold and engine hot.
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Wednesday, August 5th, 2009 AT 11:00 AM
Tiny
JCUTRIG
  • MEMBER
  • 6 POSTS
I have attached a live capture of what is going on when the issue happens the items in yellow are showing exactly when it happens

I also attached a dump of the codes but these are before I replaced the O2 sensors and the codes have been cleared and do not come back even when the issue happens.
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Thursday, August 6th, 2009 AT 12:26 PM
Tiny
JCUTRIG
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  • 6 POSTS
I can not figure out how to attach a file to the post how do I do that?
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Thursday, August 6th, 2009 AT 12:29 PM
Tiny
JCUTRIG
  • MEMBER
  • 6 POSTS
I can not figure out how to attach a file to the post how do I do that?

I just pasted them into this post but again these are before I replaced the O2 sensors and not I dont get these codes. But the issue still happens

Stored Codes
P0113 16
P0113 Intake Air Temperature Sensor 1 Circuit High Input

P0171 16
P0171 System Too Lean (Bank 1)

P0300 16
P0300 Random/Multiple Cylinder Misfire Detected

P1870 16

--- End of list ---

Pending Codes
P0131 16
P0131 O2 Circuit Low Voltage (Bank 1, Sensor 1)

P0151 16
P0151 O2 Circuit Low Voltage (Bank 2, Sensor 1)

P0300 16
P0300 Random/Multiple Cylinder Misfire Detected
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Thursday, August 6th, 2009 AT 12:30 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Check fuel pressure 60-66psi misfire and lean condition generaly caused by low fuel presure.
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Thursday, August 6th, 2009 AT 12:38 PM
Tiny
JCUTRIG
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Ok I will check that today.

Can you help me understand why fule pressure might drop when the outside temp is above 85 and the AC is on?

Thanks

John C
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Thursday, August 6th, 2009 AT 1:07 PM

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