Code po172(loss of power) on 2002 pontiac sunfirer

SOURCE: bogging down

fuel filter????

Romel Edmondson

• 68 Answers
• Posted on Dec 30, 2008

SOURCE: 2001 Pontiac Sunfire Fuel Problem

Are you certain that the engine is getting fuel? If not, then you will have to verify that there isn't any blockage in the fuel system to prevent the fuel from reaching the engine. If fuel is reaching the engine, try the following
1. Check compression values for each cylinder.

2. Inspect electrical circuitry in the distributor assembly (slack wires, broken wires, dmaged rotor etc)

3. Check to see if the timing belt was not severed. This belt transmits the drive from the crankshaft to the camshaft. If the belt ius severed, the camshaft cannot rotate in order to open the valves

SOURCE: loss of power on acceleration. engine bucking.

check transmission fluid.change fuel filter and air filter.try changing up on where you buy gas .because bad gas causes problems.

SOURCE: engine bogs down and loses all power when i push

First replace the fuel filter.

SOURCE: getting a code P0440 on my 2002 pontiac sunfire.

the reason there is a P0440 = lare leak evap sytem. this can be caused be several things like a vent valve. which need to be close to check for leaks and if that stuck open this will set a p0440. or there is another problem. but i would start with a vent valve. there is a way to test it but you need a scan tool to do this. this is a common problem. 2734 GM Tech.