HPOP?

white99 · #1 (**permalink**) 01-09-2009, 04:50 PM

I've got an early 99 f-250 when starting it cranks about twice as long as a new truck would before it fires. It smokes (white) on startup for a minute or so, longer when it's cold out, then clears up. I have noticed it smoking a little longer, loss of power, and cranks a little longer before starting. Could all of this be caused by a weak HPOP not giving sufficient oil/fuel pressure? It has not thrown any codes. Truck has 165k on it, HPOP and injectors have probably never been touched, just a guess though. Thanks in advance for any help.

**Dave** · #2 (**permalink**) 01-09-2009, 04:53 PM

That sounds like possibly bad glow plug relay or injector o rings. Your concern is not normally caused by a weak HPOP

Hades212 · #3 (**permalink**) 01-09-2009, 09:06 PM

Yea sounds like either bad Glow plug relay, or just bad Glow plugs, I had the same problem on my old 99 and it was simply that the glowplugs where shot from to much starting fluid over the years. The valve cover harnesses might be a good place to check to, if your glow plug harness is shorting out you have have the danger of fire as well as the truck being hard starting.

white99 · #4 (**permalink**) 01-10-2009, 02:21 PM

Glow plugs ohmed out fine. Not to question anyone's knowledge on here because I am sure it is greater than mine, but why/how would faulty glow plugs result in poor performance? Another important thing I forgot to mention; when accelerating w/75% pedal, the motor sounds like it is defueling @ ~1800-2000 rpm, but then picks back up. One other thing when idling at a light the motor feels like it has a miss to it. The performance is what is bothering me and if I can fix that and the others problems solve along with it then great, if not...oh well.

cliford · #5 (**permalink**) 01-10-2009, 02:40 PM

does it do this all the time or just when cold?

quicktospool69 · #6 (**permalink**) 01-10-2009, 02:44 PM

not to hijack but whats the diffrerence between the early 99 and the late 99?

Hades212 · #7 (**permalink**) 01-10-2009, 05:09 PM

Yea if its losing power once it gets up to speed and temperature on the highway than it probably has something to do with injectors, though I don't know enough about them to say, maybe one of the more experienced guys can chime in. but heres a

anyway.

**RadarRider** · #8 (**permalink**) 01-10-2009, 05:40 PM

Quote:

Originally Posted by quicktospool69

not to hijack but whats the diffrerence between the early 99 and the late 99?

Not to hijack further, the only things I know is an early '99 has a detuned version of the PCMs that are in the late '99s. Early '99s also have the same compressor wheels as the '94-'97 PowerStrokes where, to make a long story short, won't have to worry about compressor surge & a really quiet, boring whistle from your compressor wheel like the late '99s. If you own an early '99 & can't afford a turbo...keep your compressor wheel.