New 1996 CCLB 3500 454. Help set my expectations on power or is there a problem

[Keepinitoldskool]

In my experience when having a hard hot start issue its usually related to ignition timing.

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[brycebba]

I realized that my tuner does data monitoring so I checked out some time readings as well as, 02 sensors, etc. Watch the youtube video below. So I drove it around a bit this morning and one it was hot I would feel it kind of miss or stumble while going up hills and giving it enough throttle to keep going but not downshift. You can also feel it when accelerating slowly but steadily and even just revving it up and holding it at less than 3-4k rpm where at that point it cleans up and you cant feel it. It doesnt smell rich to me really. Im going to let it cool and pull a plug or two to see how they look.

http://youtu.be/9FY-Ma6PTpo

 

[Keepinitoldskool]

Im not real familiar with the 7.4 but it seems to be pulling too much ignition timing. Maybe someone who is more familiar with them will chime in.

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[brycebba]

I'm moving these hard start issues to a new thread that is focused just on that

http://www.gmt400.com/forum/showthread.php?t=25678

- Bryce -

 

[VorTecxas]

S1 voltage is supposed to jump all over, its called an open loop. S2 is only for cat monitoring, so it has no effect on driveability, but it looks like your B2S2 is bad. Timing looks good. IAT seems pretty high.

 

[brycebba]

Oh really? When the engine is at operating temperature would this temperature generally be a certain number? I mean I know that ambient temperature obviously makes a difference but I imagine the heat from the engine makes it more of a close range. Yesterday it was 112 as the measured temp on the freeway and ambient temp was about 75

- Bryce -

 

[VorTecxas]

112 on the freeway seems a bit high for a 75 ambient temp. Mine typically is around 85-95 on a 75 degree day

 

[VorTecxas]

I responded the same to your other thread, if you want to move there