Loose battery connection, now "Fish off"

[TMHark]

Had a crappy positive battery connection on driver side battery. Didn't catch it till it gave me a problem.

The old girl cut right out a couple times before I found and corrected the problem. Volts down, stall, coast, start right back up when volts came back up. Now all shiny and tight. Truck runs great...

until... I do a real hard pull, almost when you feel that "damn, shift already" to get back on the torque curve. There is a blip like you snapped your foot off the throttle and then back on. I might be being paranoid but once it blips hard, it almost feels like there are barely noticable mini-blips that follow.

No stalls, or lack of power (and now no voltage drop :rolleyes5 It doesn't have the same feel as when my PMD or IP were failing in the past.

I did notice that during one of the couple voltage losses the "service throttle" light came on. Could this voltage loss (off-on off-on while running) have damaged the TPS?

Any tips or hints?

 

[94K30]

did you test lift pump?

 

[TMHark]

I can hear it rattle when I turn on the key. It's supposedly a HD LP, only a couple years old.

I can give it a real test tomorrow, if you think it's appropriate

 

[TMHark]

Re throttle, is there anything to "service" on it? It did say "service throttle". Clean, lube?

Cleaned all 7 battery connections. Grounds looked good (all new and clean at engine swap) Voltage now reads 14+, where previously it would read right at 14 and then drop a bit.

Double checked lift pump by cracking the T and turning key to RUN. During pre-start cycle it filled a 2 liter soda bottle almost 1/4 way. Sound right? There was only a couple of water globs in the fuel.

When I went to pour the diesel back into tank (minus the water globs), there was a swoosh sound from fuel cap. If it's vented, shouldn't it have stabilized after the little bit of fuel was pumped out by lift pump?

I backed my homemade TM off by a complete turn on the wing nut. Now maxes at 12. Left the boost fooler in it's previous sweet spot (for 14). Truck ran SWEET, no bucking, even did a high speed hill climb, 90 mph up a long steep hill.:thumbsup:
EGT hit 900 (post turbo):nono:, so I backed off to avoid any larger issues. Should I turn down the heat by adjusting the boost fooler (to back off some fuel)? Not sure of how this all works, just follow instructions of what works for everyone else.

Letting truck cool off and will try fuel cap. If it swooshes again I will run with cap loose to see if problem lies there.