2003 Pontiac Montana What next

BOXTER

MEMBER
2003 PONTIAC MONTANA
6 CYL
2WD
AUTOMATIC
117,000 MILES

I have tried everything from tune ups to fuel filter replacement to transmission service and diagnosic, Fuel injecters inspected and cleaned. Using the better gas and still I have a spudder while excellerating.
I have read what you have wrote to others and I still am in trouble.
I have no check engine light on.
There are no codes stating any problems.

Would any of the sensors like Map sensor, Throttle Sensor or Mass air sensor show up on a diagnostic if they were the problem.
If not then how do I tell whats wrong

HELP

3 Replies

OBXAUTOMEDIC

MECHANIC
3,711 POSTS

Hello,

Ok, has the fuel pressure and regulator be tested? I see that you had the injector checked and cleaned and just wonderong about the fuel pressure.

A weak fuel pump can cause your symtom.

Does it run normally when driving at highway speeds?

As for any sensors being the problem the one that comes to mind would be the MAF Sensor, your can try cleaning it with some MAF Sensor Cleaner, DO NOT Use anything else to clean the MAF. You will end up replacing it if you do.

You can also check the IAC (Idle Air Control) Valve. It could have some carbon that has broken loose and causing it to not open or close properly.

.