99 F350 7.3 cranks but no start, tried to hit speratically

Asked by F350Truckin Jul 15, 2019 at 02:20 AM about the Ford F-350

Question type: Maintenance & Repair

99 F350 with turbo 7.3. Truck is automatic trans, and When put into reverse,
does nothing until you hit the gas pedal and get to higher rps. Will then
gradually start moving backwards, and pick up speed. Trans fluid level is good,
and has maintained consistent. Does not do this in forward, nor does it have
any lag in shifting in forward gears. I know it's in the trans.. but, how bad is it,

After moving reverse the first time, I shut it off, then came back to it maybe 30
min later. Wouldn't start. The way it acted seemed very much like it had air
locked in the fuel lines. After trying to start and purge air for a bit, it started.
Began kinda rough sounding, gave some gas in intervals, it eventually was able
to get high rps again and idles lot more normal..
2nd time to reverse, same issue with moving backwards. But this time when I
shut it off, it wouldn't start back up at all.
Sounds like air locked again. I've purged air, I'm getting fuel to can and prime
seems accurate.. it cranks fine, but won't start. During the crank it sounds like it
hits periodically, but won't take off still. Any suggestions? Any help is

2 Answers

Forgot to add to my question here.. a few hours into this issue, I discovered a coolant leak. Hadn't noticed it before this point, ain't I believe I would have noticed this leak if it was here before my seeing it. It's a good one. Appears to be from right around the harmonic balancer? But not positive. Water pump doesn't seem to be the source, ?


I think you need the transmission rebuilt. The 7.3 transmissions are known to be weak. I would also check the fuel pressure and make sure the glow plugs are working.

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