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Username Post: Engine Codes - PO101, PO171, PO174        (Topic#183131)
tnsouthpaw 
Forum Newbie
Posts: 7

Reg: 11-01-07
02-25-08 02:08 PM - Post#1374414    

my buddy's 03 suburban has had a low idle lately, so much that you have to hold the brake and tap the gas to keep it running during stops. The check engine light threw 3 codes: PO101, PO171 and PO174.

At the local auto shop where the code was scanned they temporarily put in a new MAF (since that's the PO101 code), but it didn't solve the low idle. The weird part is that when they removed the intake, it ran fine, but when they added the new MAF it immediatley started to bog down.

Does anyone have any insight as to what might cause this? I thought we could replace the MAF and that would solve the problem.

Thanks!
tnsouthpaw

 
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bml2200 
Member
Posts: 449

Reg: 02-12-05
02-25-08 02:12 PM - Post#1374417    
    In response to tnsouthpaw

Check your pre-cat O2 sensors, they are usually what cause those codes, especially the rough idle.
Sold: 2007.5 Chevy Silverado 2500HD LMM CC/SB Z71
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