Q: Bad gas in tank of 1994 Pontiac Bonneville

asked by on January 25, 2016

My car won't go over 30 MPH. The battery failed and I had to replace it. The part store said the alternator and starter are good, but I still can't get it to go over 30 to 40 MPH. The other day I heard sounds coming out of the tailpipe, along with some white to light gray smoke. My first thought was I had put in some bad gas as my problems started when I filled up at a local gas station. I added fuel injector cleaner while I was at the auto parts store.

The first thing I would check would be for codes on the computer. If there are no codes present you could have a clogged catalytic converter. This is where the honeycomb inside the catalytic converter becomes so clogged that it will not allow exhaust gas to pass through it bogging down the engine. The white smoke coming from the tailpipe could indicate a blown head gasket. This is where the car overheats and warps the head and causes water to pass by the gasket getting into the engine. Your car would probably run very rough if this were the case. A leak down test can be performed to check and see if in fact you do have a blown head gasket by a qualified technician.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

The starter off and on wont turn over when trying to crank the car.

Hello, thank you for writing in. Often when starters are installed they come with a shim. These shims need to be installed to help hold the starter at the proper angle. If the angle is off the gears may not...

Low idle, lots of smoke from the exhaust, feels like no power. Mechanic looked at it and said to change my oil grade?

Hi there. From the description you have provided, there is a combination of things happening with your vehicle. If the exhaust smoke is oil smoke, increasing the oil viscosity could help reduce the oil consumption. It could be, the piston...

I have a 2007 buick lacrosse my blower motor seized up and i replaced it but some thing else is wrong hvac fuse is good idk where

Was the blower motor resistor replaced ? It may be the problem. The function of the resistor is to regulate the amount of voltage to the blower motor in order to regulate the speed. If straight voltage was applied to...

Related articles

How to Buy a Good Quality Throttle
The The throttle can be explained as the part of the car that makes the engine actually go. As you press down on your car's gas pedal the throttle opens up more and more, allowing your car to move faster...
Which Type (Octane) of Gas Is Recommended for My Car?
When When someone pulls up to a gas station, the first thing they’ll see is the big sign lit up with the prices for the different grades of gasoline. There’s regular, premium, super, and a number of other variations of...
Does Gasoline Expire?
Gasoline Gasoline does expire if it is left unused for a long period of time. The problem with gas is its volatility. A volatile substance is prone to separating and vaporizing. This is especially bad if the fuel vapor has...