Skip the auto shop - Our mechanics make house calls

Q: The car is from California and the smog pump was removed, runs poorly.

asked by on

The car runs good when cold but as soon as it starts to warm up it runs poorly. My mechanic says that it is like it is not getting enough gas.He has changed injectors as someone used silicon and injectors were clogged. O2 sensor changed as it was bad.The coil was changed as it to was bad. The fuel pump was changed as was the hose to the mass air intake. Can you think of what it may be?

My car has 189000 miles.
My car has an automatic transmission.

Hello. I think your mechanic is on the right track. Check fuel pressure while running to make sure fuel pressure and supply are adequate. If so, start with verifying solid tune-up basics; solid spark and fuel injection performance without misfiring. If these pass the test, it’s possible your catalytic converter is clogged - you mention silicates and other contaminants, and your truck has quite a few miles. The air from the secondary air pump (that’s what a "smog" pump is) was to help unburned fuel burn in the cat. If it is no longer there, any unburned fuel will eventually clog the cat. If you’d like a second opinion on this issue, have one of our mobile technicians come to your location and diagnose your rough running symptoms firsthand.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  • Home
  • Questions
  • The car is from California and the smog pump was removed, runs poorly.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car won't pass smog.

The path to pass emissions will depend on what part of the emissions test (carbon monoxide (CO), oxides of nitrogen (NOx) or hydrocarbon (HC) levels) were out of tolerance. There are different components, and tuning/repair activities required to address each....

Q: the car has sit since 2012. I have started it several times since then. In June 2016. Car engine run rough and cut off after warm.

This is very common when a car has been sitting for a period of time. I would suggest draining the fuel, replacing the fuel filter, replacing the spark plugs, changing the oil for starters. These are all basic maintenance items...

Q: Where is the location of the fixed chain guide on a 2.2 Ecotec?

The location of the fixed timing chain guides are inside the front timing cover on the right side of the crankshaft and is about 12 inches long. The second fixed chain guide is under the valve cover and goes between...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.