I installed the GM hotcam over a weekend a couple of weeks ago. Install went well. Installed the new Predator tune from James at RWTD. Ever since that weekend, I have a couple of issues that I can not come up with an answer on. (99 SS a4)

#1. From a stop, 1/4 accel, vehicle shifts rapidly 1,2,3 before 30mph, then If i go WOT, vehicle stays in 3rd for about 3 seconds Then it will jump into 2nd. After doing some logging of this event,
The only thing i saw was 4.3 volts at tps, 26mph in 4th gear at 1350 rpms. Stays this way for about 9 frames, then finally goes into second gear. No getting any slippage, feels like a M6 in 6th gear at 40 mph when you go WOT, just boggs down.

#2. Since cam install, my gauges now sweep like a corvette 3 out of 4 times when starting, also my trip odometer resets every start.
Have tried 2 different tunes and even stock tune, still does it. Related to #1???

I have checked all of the connection i messed with during install, all ok there. also has new TPS.

Any help would be great!!!

 

See here :

http://web.archive.org/web/200201071...bulletins.html

& look under Body & Accessories for a bulletin about the resetting trip meter.

My understanding is that low battery voltage is part of the culprit, and may be having an effect on your gauge cluster as well.

Not sure on the tranny , but as the 4L60E is computer controlled, I'd venture to guess that your programming may be in need of some tweaking.

Oh, FYI -

If you have the cluster replaced, the PCM will need to be reprogrammed to recognize the new cluster !

I had to this as after I replaced mine the Airbag light was flashing.

On the plus side, the reprogram feels much stronger than what was there before, and then I re-added the Hypertech program on top of it.

Of course, I had to have Hypertech redo their unit for use w/ the new GM programs ...

Hope some of this helps !

Britt

 

GOOD CALL on the trip meter.

The trans deal is difficult. I have tried with stock tuning and custom tunes. Same result.... Thats going to be the hard one to figure out.

 

hey...sorry that i cant really help you with the transmission problems, but this past summer, my guages would go crazy, i would start up the car, and it would be idling, and than a second later the tach would jump to like 7, and the speedo would jump to like 130, and the trip would reset. I called a friend of my'n who is a very good mechanic, and he told me that it was the battery...sure enough i looked on the battery and there was some corrosion on one of the terminals, i replaced the battery and everything was fine..so maybe thats your problem, and who knows, maybe a bad battery can affect the entire computer system and thats whats messin with your transmission.

 

I am going to check no the battery tomorrow morning... Thanks for the thoughts.... i hope i get this figured out...

 

replaced battery, gauge problem fixed, still have trans issue

 

Well.. im still having this battle. I have replaced the PCM, TPS cleaned the MAF.. Still have the same problem.