Re: Having VR6 troubles

[planemech@ameritech.net]

Hello Brian,
The first item to get concerning your Jetta's jerky throttle response is
some troubleshooting reference's. Check your local libraries to see if
they carry the Mitchell Repair Manuals. These manuals have
troubleshooting sections that cover problems not detected by the OBD II
diagnostic system in the Jetta. You should also find someone who has a
OBD II tester and see if you have a DTC (fault code) in the memory of
the onboard computer. The Mitchell Manuals have the codes listed along
with steps to follow to isolate the problem. Low speed problems could be
as simple as a fuel filter change or adding fuel injection cleaner to
clean the injectors. 
I drive an '98 GLX with 62K miles on it. My check engine light has been
on for about a month now. With the help of a friends OBD II scan tester,
I found out that I have a fault code P1128. The Mitchell Manual told me
this code happens when the engine has a fuel rich condition. The O2
sensor tries to adjust the fuel mixture leaner but reaches a limit and
turns on the check engine light. (This light is also called an MIL,
malfunction indication light). The car drives ok, fuel mileage is ok,
but I have this ck eng light to stare at. I am currently checking the
fuel filter, injectors, and fuel pressure. 
One hour of reading will help, even if you don't do the repair yourself.
You will have a basic idea of what is wrong with the car. 
If any one else out there has had this fault code (P1128) on their VR6,
let me know what you found. Once I find my problem I will post the
repair. 
Trevor
planemech@ameritech.net  

BullShin00@aol.com wrote:
> 
> My engine light has been going on and off for a year now.  No big deal.
> Recently (past two months) my car likes to buck.  This is in first of second
> gear and the pedal barely depressed.  The car will hardly accelerate then all
> of a sudden it starts to jerk like I'm pumping the gas quickly.  The whole
> time my foot is at the same position on the pedal.  Also does a variation of
> this when cruising in 3rd or 4th.  I'll be light on the gas driving normal
> and then it starts to coast as if I had taken my foot of the pedal.  When I
> go to give it more gas I get this big gunk and I'm back to normal driving.
> This gunk or thump always happens when I get off the gas and back on it.  If
> I barely touch the throttle I'll either get this bump or nothing.  If I get
> nothing I'll press the gas harder and I get a more pronounced gunk.  This
> happens when the CE light is on or off.
> 
> 10 minutes ago did the coil pack test with mist.  I saw no arcing or
> sparking. I'm frustrated and about to go to the stealership.  Any one with
> similar problems HELP!
> 
> Brian
> 97 GLX  68,000 miles only mod is K&N filter