Why does my car stumble when I Turn on the ignition?

Why does my car stumble when I Turn on the ignition?

3 Basic Causes of Stumble As with engines before the days of Electronic Fuel Injection (EFI), stumble had two basic causes- incorrect ignition and incorrect fuel/ air mixture for the required operating condition.

Why does my check engine light keep coming on?

The Check Engine light will also come on if your mass airflow sensor fails This can happen if your air filter has not been replaced on a regular basis. If this is the problem and you continue to run your vehicle with the Check Engine light on and the airflow sensor is failing, you’ll be creating more problems.

What causes engine hesitation and stumble problems on the 90 +?

Then it developed an intermittent hesitation problem- you would be cruising at 60mph, on a 400 mile trip, ease off the gas pedal, and suddenly for 1/4 second, it was as though someone had switched off the engine and then turned it back on again. The car would then run faultlessly for the rest of the trip.

Is there check engine light for intermittent stalling?

Many times, there will be no check engine light and no fault codes to give you a clue as to what might be causing the engine to stall. So the trick to diagnosing an intermittent stalling problem is to catch the vehicle when it’s acting up — and that rarely happens when you have the vehicle in your shop.

What causes a flashing check engine light on a Chevy Suburban?

While a majority of the time, the flashing check engine light is going to be caused by a misfire related to your Suburban’s ignition system or fuel system (as stated above), there are other issues that can cause it. Your timing chain could have jumped.

Why is the ignition not working on my Chevy Suburban?

EGR- The EGR system recycles burnt exhaust gasses back into the combustion chamber. Crank/Cam Sensor- When the cam or crank sensors are not being read by the ECM/PCM, it’s impossible to get the ignition timing right. If you Suburban does start at all, it’ll run rough.

What causes a Chevy Suburban engine to misfire?

Keeping in mind that any engine needs air, fuel, and spark for ignition, your Chevy Suburban’s fuel system can often cause the engine to misfire. It can run too lean or rich. Alternatively, there may not be enough fuel for proper combustion, or the fuel isn’t atomizing properly.

What causes a Chevy Suburban to run rough?

Crank/Cam Sensor- When the cam or crank sensors are not being read by the ECM/PCM, it’s impossible to get the ignition timing right. If you Suburban does start at all, it’ll run rough. It could be a more serious mechanical issue, such as as bent valve, bad lifter, etc….