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check engine light help

  #2  
Old 10-01-2007, 11:39 AM
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Location: Montana
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Default RE: check engine light help

since you've done the replacements have you cleared the codes to see if they came back? I believe a P1491 is an egr issue... do you have any sort of "stumble" or hesitation around 2500-3000 rpms? As for the P0171 do you by chance have an aftermarket intake or anything not stock on the vehicle?
 
  #3  
Old 10-01-2007, 11:40 AM
JimBlake's Avatar
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Location: Wisconsin
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Default RE: check engine light help

P0171 = system too lean
P1491 = EGR valve lift insufficient

I don't know why a fuel PUMP was suggested... Seems pretty expensive to replace that just based on those codes. Did anybody measure your fuel pressure? Any other tests besides reading the codes?
 
  #4  
Old 10-01-2007, 12:39 PM
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Location: Montana
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Default RE: check engine light help

The system to lean code can be caused by a vacuum leak or improperly installed aftermarket intake or not hooking up a MAF sensor if you have one... Anyway, just let us know the answers to those couple of questions and we'll get you straightened out in no time!
 
  #6  
Old 10-01-2007, 12:59 PM
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Default RE: check engine light help

MAF is a mass air flow sensor located somewhere on the intake if you have one.
 
  #8  
Old 10-01-2007, 04:56 PM
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Default RE: check engine light help

Code p1491 is usually caused by a sticking egr valve. An egr valve sticking open can cause a code p0171.
 
  #9  
Old 10-02-2007, 09:39 AM
00AccordLX5spd's Avatar
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Location: Brandon, MS
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Default RE: check engine light help

So it sounds like an EGR valve problem. Here's a pic to help you out. I got this directly from our DIY section. 4th post from the top by deserthonda. It leads to an online manual. There are also online manuals available for downloading for free on your car. Just check out the DIY section.
By the way, your engine is an F22B1


[IMG]local://upfiles/7626/E31B2E67FC1646C883BF431BE375BEA8.gif[/IMG]
 
  #10  
Old 10-02-2007, 12:14 PM
Join Date: May 2007
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Posts: 412
Default RE: check engine light help

I had the P0171 and P0170 code and an aftermarket intake. I've had the intake for about a year though and no MAF. For some reason, after filling up my tank of gas the CEL light went away by itself.
 

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