Surging after Lockup

[Dura-Ration]

I have a surging at highway speeds of 55mph & up. It seems to be worse when engine is still cool & right after Torque converter lockup. It will continue to do this until it reaches 195*. And then it will be occasional. This has begin going on for about 5 months, but recently gotten worse. Any suggestions would be helpful. Is there a sensor that is dirty or something else ?

 

[Ed HD]

When was the last time you changed your spin on, and/or drained the fluid?

 

[Dura-Ration]

200 miles ago. What fluid are you referring too? Thanks

 

[btfarm]

Is it in any tune? Tire pressures all even? New fuel filter?

 

[Dura-Ration]

Yes its tow tune and race tune. I cleaned all sensors this morning and now i'm about to drive it to see if that did anything. If not, I'll try my stock tune and see if that works.

 

[Dura-Ration]

All new filters 200 miles ago. Tires are all the same pressure.

 

[Dura-Ration]

Nope

Tried the stock tune, it made it less noticeable but still there. It has something to do with fuel or so it seems. Help

 

[btfarm]

You might try dumping a bunch of injector cleaner in the tank and as the saying goes "wring the PI$$ out of it"...

 

[BudTX]

Do you notice it surging at idle?

It may be a reach, but I am thinking fuel pressure regulator.

 

[Dura-Ration]

Gradual decline

At idle it purrs like a kitten. The CP3 injection pump and regulator are fairly new, less than a year old. Thanks for the input Bud.
Kept it coming guys.:thumbsup:

 

[Ed HD]

How old is the transmission fluid? Has it ever been drained completely (except for what's in the TC)?

 

[Pepperidge]

How old is the transmission fluid? Has it ever been drained completely (except for what's in the TC)?

We just put a Mike L stage 4 trans in a couple months back

 

[Dura-Ration]

I checked my balance rates after what Mike said (BTFARM) and were fine I guess. #8 Was -1.74 #6 was -0.84 the rest were -0.14 in park. I have been running Biodiesel for awhile but now that its winter ( around 30* to 50* ) I'm using regular diesel and power service for addivitve.

 

[Pepperidge]

I thought balance rates were supposed to be checked in Drive...

 

[Dura-Ration]

Well they only change for the better in drive, I remembered the worst numbers.

 

[BoostN]

I thought balance rates were supposed to be checked in Drive...

Either one. But, I know the rate standard is different from Park to Drive.

 

[CtChevy427]

I thought balance rates were supposed to be checked in Drive...

I have read that GM says +/- 4 in Neutral and +/-6 in drive with engine at operating temp. There is also talk of putting a load on it by turning the steering wheel and having the A/C on.