How can I tell if my MerCruiser is stalling?
You can rig a temporary fuel pressure gauge in the fuel delivery line and watch for a minimum of 6 psi, but there is also a fuel inlet screen on the carb at the fuel inlet that I would check first. Also, check the anti-siphon valve at the fuel tank as they get plugged up once and a while.
What are the symptoms of an engine stall?
Here are some of the most common symptoms of, a faulty mass airflow (MAF) sensor; The engine is very hard to start or turn over. Engine stalling shortly after starting. The engine hesitates or drags while under load or idle. Hesitation and jerking during acceleration.
Why does my PCM stall when I Turn on the engine?
The MAP sensor senses intake vacuum, which the PCM uses to estimate load so it can adjust the air/fuel mixture accordingly. If the MAP sensor isn’t reading right, the PCM will receive bad information and possibly add or subtract more fuel than it should causing the engine to stall.
Why does intermittent stalling occur in a car?
One of the more unusual causes of intermittent stalling we’ve heard about is a defective vehicle speed sensor. When the vehicle stops moving, the PCM may not engage the idle speed motor (carbureted engines) or idle air bypass motor (fuel injected engines) so the engine will idle normally.
Why is my mercury 2 stroke engine stalling?
Check the fuel line coupler where it connects to the engine. A friend of mine had this same problem. It turned out to be a loose, or pinched, o-ring inside the coupler. $5 later after a stop at Walmart and all was well. Try squeezing the bulb while the engine is off. It any gas leaks from the coupler, you have the same problem.
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.
Why does my mercury run lean at low idle?
At higher speeds, the crankcase vacuum is lower because you have the throttle plates open, are loading it up with gas and the air leak has lots less effect on mixture. Only at idle will an air leak cause the engine to run lean when the throttle plates are closed and the fuel delivery is very low.
Why does my car stall after a few miles?
When a bad module is responsible for an intermittent stalling problem, the engine will usually cold start just fine and run OK for short distances, but stalls after driving more than a few miles or when driving at highway speeds (especially during hot weather). It’s as if somebody suddenly turned off the ignition.