1994 GTP struggles during acceleration

#1

3.4L V6 with Hydra-Matic 4T60-E. The trouble began about three months ago.
Engine died after fast acceleration. It did not reoccur for several weeks.
But slowly but surely it became more frequent. Now it is almost a
guarantied to happen every time I drive the car. Typically stumbles when I
depress the accelerator to start moving, it will clear till about 20 to
30mph, stumble and surge, then pick back up, it will reoccur at about 50 to
60mph. This can be very nerve racking, especially when it happens while
merging onto the highway during rush hour. When the engine bogs down, the
only way I can get power back is to floor it and hope for the best. After
moderate to hard accelerations the engine often dies. I took it to a
transmission shop; they gave the transmission a clean bill of health. They
clam it’s a fuel supply issue. When in park or natural I can rev the
engine up to max with no problems. It seems to only act up when the engine
is placed under a load. On the rare occasions I do get a check engine light.
It does not illuminate during the next start. Any thoughts?

thanks

#2

Plugs, wires, fuel filter, check fuel pressure, all possibilities here.
"Daniel Johnson" <viking508 (AT) cox (DOT) net> wrote

Quote:

3.4L V6 with Hydra-Matic 4T60-E. The trouble began about three months
ago. Engine died after fast acceleration. It did not reoccur for several
weeks. But slowly but surely it became more frequent. Now it is almost a
guarantied to happen every time I drive the car. Typically stumbles when
I depress the accelerator to start moving, it will clear till about 20 to
30mph, stumble and surge, then pick back up, it will reoccur at about 50
to 60mph. This can be very nerve racking, especially when it happens
while merging onto the highway during rush hour. When the engine bogs
down, the only way I can get power back is to floor it and hope for the
best. After moderate to hard accelerations the engine often dies. I took
it to a transmission shop; they gave the transmission a clean bill of
health. They clam it's a fuel supply issue. When in park or natural I
can rev the engine up to max with no problems. It seems to only act up
when the engine is placed under a load. On the rare occasions I do get a
check engine light. It does not illuminate during the next start. Any
thoughts?

thanks

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#3

Almost certain from the symptoms to be a fuel traffic supply problem, most
likely a fuel filter, maybe a pump. Reving the engine with no load uses
little fuel, accelerating into traffic does.

"Daniel Johnson" <viking508 (AT) cox (DOT) net> wrote

Quote:

3.4L V6 with Hydra-Matic 4T60-E. The trouble began about three months
ago. Engine died after fast acceleration. It did not reoccur for several
weeks. But slowly but surely it became more frequent. Now it is almost a
guarantied to happen every time I drive the car. Typically stumbles when
I depress the accelerator to start moving, it will clear till about 20 to
30mph, stumble and surge, then pick back up, it will reoccur at about 50
to 60mph. This can be very nerve racking, especially when it happens
while merging onto the highway during rush hour. When the engine bogs
down, the only way I can get power back is to floor it and hope for the
best. After moderate to hard accelerations the engine often dies. I took
it to a transmission shop; they gave the transmission a clean bill of
health. They clam it's a fuel supply issue. When in park or natural I
can rev the engine up to max with no problems. It seems to only act up
when the engine is placed under a load. On the rare occasions I do get a
check engine light. It does not illuminate during the next start. Any
thoughts?

thanks

#4

Coil pack(s)

On Fri, 20 Oct 2006 20:37:48 -0500, "Daniel Johnson"
<viking508 (AT) cox (DOT) net> wrote:

Quote:

3.4L V6 with Hydra-Matic 4T60-E. The trouble began about three months ago.
Engine died after fast acceleration. It did not reoccur for several weeks.
But slowly but surely it became more frequent. Now it is almost a
guarantied to happen every time I drive the car. Typically stumbles when I
depress the accelerator to start moving, it will clear till about 20 to
30mph, stumble and surge, then pick back up, it will reoccur at about 50 to
60mph. This can be very nerve racking, especially when it happens while
merging onto the highway during rush hour. When the engine bogs down, the
only way I can get power back is to floor it and hope for the best. After
moderate to hard accelerations the engine often dies. I took it to a
transmission shop; they gave the transmission a clean bill of health. They
clam it’s a fuel supply issue. When in park or natural I can rev the
engine up to max with no problems. It seems to only act up when the engine
is placed under a load. On the rare occasions I do get a check engine light.
It does not illuminate during the next start. Any thoughts?

thanks

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1994 GTP struggles during acceleration

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

1994 GTP struggles during acceleration - 10-20-2006 , 08:37 PM

Re: 1994 GTP struggles during acceleration - 10-21-2006 , 08:03 AM

Re: 1994 GTP struggles during acceleration - 10-22-2006 , 02:59 AM

Re: 1994 GTP struggles during acceleration - 12-08-2006 , 04:12 PM