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Old 08-29-2017, 10:44 AM
Aber71 Aber71 is offline
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Join Date: Apr 2016
Posts: 14
Default P0174

2003 Ford Ranger 4.0 SOHC. My truck threw this code. I looked into it and says its most likely a vacuum leak. I have changed prior to this- plugs/wires, coil pack, MAF sensor. Since getting this code I have replaced the intake manifold gasket, iac gasket, throttle body gasket, pcv valve, and o2 sensor upstream on driverside. I've sprayed all the vacuum line and cant seem to find any leak at all. I'm starting to get frustrated. After changing the iac/throttle body gasket the idling fluctuates. Any ideas on what the issue could be???
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Old 08-29-2017, 11:44 AM
TxGasRacer TxGasRacer is offline
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Join Date: Aug 2012
Posts: 229
Default Re: P0174

If you have an 01+ 4.0 with lean codes (PO171 and/or PO174) look here!
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1998 Ranger XLT Super Cab 4.0 ohv v6 - 5r55E automatic Trans - 8.8 with 3.55gears - Toreador Red Clear Coat Metallic -Explorer Sport Trac White Faced Gage Cluster -2006 Mirror Swap
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Old 08-29-2017, 11:48 AM
Aber71 Aber71 is offline
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Default Re: P0174

both my pcv elbows look good. except the one by the throttle body pinches close when started
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