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    98 454 lean and fuel pressure

    Thanks. Purge solenoid shows full duty cycle under load on scan tool. I'll command it off and on tomorrow. Just went back through it tonight. Clamped off return hose again, running pressure stays at 45. I then deadheaded the gauge at the new filter and cycled the key about 6 times, gauge got to...
  2. A

    98 454 lean and fuel pressure

    Recently purchased the truck. Shows 133,*** on the odometer. Got truck with a K&N filter and a straight through 4" muffler. Still has cats. In the process of replacing leaking intake gaskets and repairing a hard hot starting issue, I did a new fuel pressure regulator, 5.0 motorsports "stock...
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    4l80e no overdrive

    Well, while doing all the other new to me truck maintenance, I was thinking about my no 4th gear issue. I thought that should it need rebuild, a new valve body wouldnt hurt. I did a bucket flush before I pulled the pan to move everything through the old filter. Dropped the pan, removed my old...
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    4l80e no overdrive

    "never upshifts to 4th gear then neutrals" It does not upshift for certain, but has never nuetraled, had it up to 80 mph in od selected but obviously 3rd gear. Thanks for the chart, I'll go looking soon.
  5. A

    4l80e no overdrive

    As far as closed loop goes, I'll check tonight. I also think that it should throw a code if there is a discrepancy between realized ratios and selected gear. I think that's odd, but can't figure out why. Is there a known issue with shift solenoids clicking but not engaging?
  6. A

    4l80e no overdrive

    98 1-TON big block 4wd has no overdrive. Watching the trans data trans fluid temp got to 175* on the test drive. When doing 60 mph, rpm is at 3k, 4th gear selected, ratio says .75:1 , but input and output shaft speeds read the same. 1-2 and 2-3 solenoids both on When calling for O.D. When...

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