2002 GTP cutting out

#1

I have a 2002 GTP that cuts in and out at about 122 mph. I am at a loss as to
what is causing it. For mods, I have a cold air induction, Autolite 104 spark
plugs gapped at .060, DHP Ver 1 PCM, and a 3.4 pulley. For exhaust, I have a
Catco high flow cat convertor, u-bend and resonator were replaced with straight
pipe, along with 2 Flowmaster 40 series mufflers. The only pipe that is 2 1/2
is the
U-bend/resonator replacement. The rest of it is stock piping. It starts cutting
out at around 123. Before I installed the pulley, it would cut out at 123 then
stopped after installing the plugs, but wouldn't hit any higher speeds. Once in
a while I would be able to hit 129. After installing the pulley, it is cutting
out at 123 again and will not go any higher. I do have an enhanced Autotap if
it will help any. If I am correct, wouldn't I have a SES light if I had a true
knock retard? I'm at a loss on this one. Thanks

#2

the car is at 4000 rpm at 123 mph

#3

"Nascar24Rulz" <nascar24rulz (AT) aol (DOT) com> wrote

Quote:

I have a 2002 GTP that cuts in and out at about 122 mph. I am at a loss as
to
what is causing it. For mods, I have a cold air induction, Autolite 104
spark
plugs gapped at .060, DHP Ver 1 PCM, and a 3.4 pulley. For exhaust, I have
a
Catco high flow cat convertor, u-bend and resonator were replaced with
straight
pipe, along with 2 Flowmaster 40 series mufflers. The only pipe that is 2
1/2
is the
U-bend/resonator replacement. The rest of it is stock piping. It starts
cutting
out at around 123. Before I installed the pulley, it would cut out at 123
then
stopped after installing the plugs, but wouldn't hit any higher speeds.
Once in
a while I would be able to hit 129. After installing the pulley, it is
cutting
out at 123 again and will not go any higher. I do have an enhanced Autotap
if
it will help any. If I am correct, wouldn't I have a SES light if I had a
true
knock retard? I'm at a loss on this one. Thanks

The Powertrain Control Module has a built in speed limiting program that
doesn't allow the car to exceed the speed rating of the original equipment
tires. It is a federal mandate and it is illegal to change it.

That's as fast as your car can go.
Bob K

Quote:

#4

Maybe you should try asking on the forum at glubgp.com
Someone there might know.

Jay S

"Nascar24Rulz" <nascar24rulz (AT) aol (DOT) com> wrote

Quote:

I have a 2002 GTP that cuts in and out at about 122 mph. I am at a loss as
to
what is causing it. For mods, I have a cold air induction, Autolite 104
spark
plugs gapped at .060, DHP Ver 1 PCM, and a 3.4 pulley. For exhaust, I have
a
Catco high flow cat convertor, u-bend and resonator were replaced with
straight
pipe, along with 2 Flowmaster 40 series mufflers. The only pipe that is 2
1/2
is the
U-bend/resonator replacement. The rest of it is stock piping. It starts
cutting
out at around 123. Before I installed the pulley, it would cut out at 123
then
stopped after installing the plugs, but wouldn't hit any higher speeds.
Once in
a while I would be able to hit 129. After installing the pulley, it is
cutting
out at 123 again and will not go any higher. I do have an enhanced Autotap
if
it will help any. If I am correct, wouldn't I have a SES light if I had a
true
knock retard? I'm at a loss on this one. Thanks

#5

"Nascar24Rulz" <nascar24rulz (AT) aol (DOT) com> wrote

Quote:

I have a 2002 GTP that cuts in and out at about 122 mph. I am at a loss as
to
what is causing it. For mods, I have a cold air induction, Autolite 104
spark
plugs gapped at .060, DHP Ver 1 PCM, and a 3.4 pulley. For exhaust, I have
a
Catco high flow cat convertor, u-bend and resonator were replaced with
straight
pipe, along with 2 Flowmaster 40 series mufflers. The only pipe that is 2
1/2
is the
U-bend/resonator replacement. The rest of it is stock piping. It starts
cutting
out at around 123. Before I installed the pulley, it would cut out at 123
then
stopped after installing the plugs, but wouldn't hit any higher speeds.
Once in
a while I would be able to hit 129. After installing the pulley, it is
cutting
out at 123 again and will not go any higher. I do have an enhanced Autotap
if
it will help any. If I am correct, wouldn't I have a SES light if I had a
true
knock retard? I'm at a loss on this one. Thanks

Thats where the speed limiter kicks in, you need to get a reprogrammed ECU.

Got a cardomain site? I wanna see the car.

#6

"Paradox" <parallaxaz (AT) cox (DOT) net> wrote

Quote:

"Nascar24Rulz" <nascar24rulz (AT) aol (DOT) com> wrote in message
news:20050109134400.09581.00000013 (AT) mb-m13 (DOT) aol.com...
I have a 2002 GTP that cuts in and out at about 122 mph. I am at a loss
as
to what is causing it.

For mods, , DHP Ver 1 PCM,

Quote:

Thats where the speed limiter kicks in, you need to get a reprogrammed
ECU.

Got a cardomain site? I wanna see the car.

He's got a Digital Horsepower PCM. The speed limiter is removed with their
programmed replacement PCM.

Jay S

#7

On Sun, 9 Jan 2005 20:17:24 -0500, "Robert Klauka"
<rklauka (AT) chartermi (DOT) net> wrote:

hmmmmm, mine don't cut out until it gets to 129 and it's stock.....and
it would keep going a long way beyond that if it didn't shut off at
that speed (ECM/tire limits issue). It's still pulling hard at 129.

<clip clip>

Quote:

That's as fast as your car can go.
Bob K

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2002 GTP cutting out

Pontiac Discussion of Pontiac Automobiles (alt.autos.pontiac)

2002 GTP cutting out - 01-09-2005 , 01:44 PM

Re: 2002 GTP cutting out - 01-09-2005 , 02:16 PM

Re: 2002 GTP cutting out - 01-09-2005 , 08:17 PM

Re: 2002 GTP cutting out - 01-10-2005 , 11:57 AM

Re: 2002 GTP cutting out - 01-10-2005 , 07:00 PM

Re: 2002 GTP cutting out - 01-10-2005 , 11:57 PM

Re: 2002 GTP cutting out - 01-14-2005 , 06:25 PM