| View single post by wh23g3g | |||||||||
| Posted: Thu May 3rd, 2018 06:06 pm |
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wh23g3g Joined: Sun Mar 11th, 2018
Posts: 130
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I've got a P0171 code that has popped up in the past couple of days. My 98 2.5 has been running good, finally with good idle after battling some idle issues for the past few months that turned out to be a leaking EGR vacuum regulator. In that time frame of diagnosing the idle problem all sensors and ignition components had been changed over to new Motorcraft parts to rule out lower quality aftermarket parts. Even had the timing and compression check twice. It now runs good. It does take a few extra cranks to start up usually. I attribute that to the quick fuel pressure drop. I've checked the static fuel pressure today and the running fuel pressure. It's hard to get a static reading because the pressure leaks down as soon as you cycle the key. It starts fairly easily just an extra second or so to get it to fire up. At idle running in Park it's right at the Ford limit at a steady 58 PSI. I believe the limit is 56-72 PSI according to the Ford manual. So what would it be that is causing the pressure to bleed down so quick after shut off? Is there something on the fuel pump assembly that controls that. I was told on another forum that an injector leaking down wouldn't likely cause such a drop so quickly. I replaced the injectors with remanufactured Bosch injectors about a year or two ago. The only difference between now and back months ago when I was still diagnosising the idle problem is that I've been using the A/C a lot. It still drives good and has as much power as a stock high mileage 2.5 should have. The engine was replaced at 228,000 and is now probably close to or at 200,000 itself. I've got a pump assembly under warranty but I want to make sure if I need to check anything else first. It was also replaced a year or two ago and from the beginning the sender never worked right. It's close to a 1/4 off.
____________________ 1998 Ford Ranger XLT 2.5 4R44E Automatic 4.10 non-limited slip, 1993 Ford Ranger XLT 2.3 M5 Manual, 3.45 non-limited slip |
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