I've read somewhere before that when shifter is in position 1,
there is some sort of protection for engine blow.
I've noticed that when I hit WOT when in 1st engine stops.

Is there any way to disable this???

 

Burn a chip with a higher rev limit.

Why do you ask? Do you want to rebuild a blown engine?

 

I'm not talking about rev limiter.
If I push WOT when shifter is in D or 2 car starts normally
and pulls hard, but if I do the same when in 1st engine stops pulling ( not even close to rev limit ) then if I let go of accelerator a little bit it starts pulling again.

I'm asking this because sometimes trans shifts into 2nd gear sooner then I would like it to.

 

Hmm doesn't sound like a normal thing to me..
I do that all the time and never had a problem.
Wodner if you might have an intake manifold leak
or something ?

 

In 1990, you only have a TV cable running from the tranny to the TB. The angle of the linkage controls line pressure.

The VSS (vehicle speed sensor) signal goes to the computer so you can have all the dash information displayed correctly, as well as have good engine running during coast-down (mainly near-idle) situations.

The stock 'rev' limiter isn't even really set at anything. For your year, the 'chip' in the car has no effective rev limiter since it is factory default fuel cut-off at 10031 RPM and back on again at 9544 RPM. Also, the speed limiter is set at 255 fuel cutoff, 254 fuel re-enable. Those are the only points in the calibration that would affect fuel-cutoff, which is about the only thing that could limit pulling in one gear versus another.

One of 2 things--either you are feeling what happens when you have a TPI setup that can't breathe well above 4800RPM OR the fact that you are taking your foot off the gas and going into coast-down mode actually brings you closer to what your air/fuel ratio should be.

If it was the latter, dyno tuning would likely help out. First gear, you are under a lot of load. Something like this could possibly be a fuel filter or even an ignition system that needs a tuneup.

If anyone sees this as false information, please let me know. I really don't think that there is any factory-designed limitation built into the C4 in 1st gear though. The only things I see are the lack of breathing ability and/or fuel supply. GM had the fuel supply OK...they just needed to work on the breathing ability ;) -Matt-


[Modified by HighHopes85, 8:07 PM 5/26/2002]

 

The problem is not related to rpm.
It happens at 1000 rpm when I push pedal and it happens at 3000 rpm.
It's allways the same.
Car acts like the ignition key was turned off and the when I let go off acelerator pedal it starts working normal again.

 

That doesn't sound right. :nonod:

 

Mine will cut off when I gun it when it is low on gas. But i think your has more problems then that..