phatmobile98

First off my car is a 1998 Z28 LS1. Major mods done - heads/cam package all the bolt-ons (incl. SLP LT headers), and a built 4L60E tranny w/3500 high stall torque converter.

Just recently I downsized rims from 19's w/street tries to 18's w/nitto DRAG RADIALS. I could NEVER get full traction on launch until now...but here's where the problem is. Almost everytime I floor it from a dead stop and begin to grab, the car takes off for a split second and then makes a loud whine noise for about 1/2 a second and then sputters with almost ALL power being shut down. The car doesn't turn completely off though, because when I let go of the gas a little it everything goes back to normal -- and I'm on my way. This ONLY happens when I get traction from a launch! When I spin (cold-tires) from a launch OR even when I go from a roll and get traction, everything is ok at full-throttle. WHAT COULD BE DOING THIS?

The only problem that I am aware off on my car right now is an o2sensor code tripping the SES light: bank 2, sensor 1 (pass side front). I replaced the o2 recently, but the light still comes on and I do think that I’m running a little rich. Other than that I don't know of any other problems. ??

I've done some research and the only thing I can think of causing this is my fuel system. I have the 28# injectors cause I have a 98, and I'm only putting out at most 380-400rwhp/tq, so I don't know why the fuel system could be going bad. I do have almost 90,000 miles on the car though.

I also read about this:

Fuel Cutoff Mode
The PCM cuts off fuel from the fuel injectors when certain conditions are met. This fuel shut off mode protects the powertrain from damage, and improves drivability. The control module disables the injectors under the following conditions:

The ignition is OFF (prevents engine run-on)
The ignition is ON but there is no ignition reference signal (prevents flooding or backfiring)
The engine speed is too high (above red line)
The vehicle speed is too high (above rated tire speed) (Does not apply to Y Cars)
During an extended, high speed, closed throttle coast down (reduces emissions and increases engine braking)

Could this be what's happening??
ANYONE HAVE ANY INPUT ON THIS? PLEASE - I NEED ALL THE HELP I CAN GET. THANKS!!

Lifted8100

I had the same problem on my truck. I had some exhaust work done and someone swapped the front O2 sensor with the rear one. Not sure if someone has messed with your O2's wiring lately but check that... might be the problem.

12secSS

iTrader: (30)

Check your battery mount, this is most always the cause to the exact symptoms you are experiencing with your car. It is grounding out on your shock tower post, or something is loose in the engine bay (whining noise prior to shutdown) and this is grounding out your electrical system. Check those first before guessing it is those other things you mentioned.

Poltergeist

Yep got a neat video of it happening to QwikSS. Car launches, it goes dead, the crowd says 'Awww' (thinking the motor went), then all of a sudden it comes back to life and he takes off.

Qwik03

I was thinking the same thing happend to my car when I read the post.

My Optima use to ground out on the AC Dryer under hard launches and completely reset my cars computer.It took me probablly 5 trips to the track to figure out what was wrong.

Look for welding spots on the alluminum!

Thanks Rob for telling everybody about the Video where I got my *** handed to me by RobSS!

xp3nd4bl3

I want the video!!!

Qwik03

http://donleeauto.com/cars/RobCowlin...owling_SS.html

There you go!

xp3nd4bl3

That's classic!

Poltergeist

Nope, I meant this one. Listen to the crowd on the launch.

xp3nd4bl3

that's a keeper! file -> save...