Quote:
Originally Posted by lee bradshaw
I had the same problem on my 98 F150 XL with a 4.2 If you look on the driver side of your phlenum at the very back there is a vacuum hose that has a 90 degree elbowe that is probably leaking and needs to be replaced. there are two coolant lines that are connected very near to the vacuum line so you can trace them back. The coolant lines start at the front of the engine where the heater hoses connect. There is another elbow in the front that connects to the PVC valve it is located at the front of the plenum on the under side. I have replaced both of these elbows and ended the code problem. the elbows will have to come from Ford and are 13.00 each in Tulsa Oklahoma. A lot cheaper than a fuel pump. I know I put on a fuel pump first. I am sure this will fix your ride.
Best regards
Lee Bradshaw
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DITTO, What Lee said !!!!
I cleared my code by replacing the entire PCV Assembly, (includes elbow to rear of plenum on my 98 5.4 V8. I also used CRC Cleaner and sprayed the MAF Sensor until it was all shiney and new looking. My 2 codes have been cleared since March.
Next time use the search function on this site. You could type in P0174 for example, and you find alot of info on this problem. It has helped me out on a few fixes.