Why does my car start perfectly and then when I push on the accelerator the rpms lower and then my car dies?

Question

I own a 91 Honda Crx 2 dr. Started it this morning, everything went fine. Then I went to put it in gear and press on the accelerator and then the rpms lowered and my car died. I started it again and the same thing happened. My car starts fine, but once I press on the gas it goes down hill from there. I think it could be the fuel filter or pump, but I want to make sure. What could it possible be.?

Answer 1

It sounds like a fuel pressure problem,as you said.Before changing parts it would be best to check the pressure at the relief valve on the engine.Have someone turn the ignition on while you carefully depress the valve [surrounded by rags] and see how well it works.If it's poor,then change the filter.The pump pickup tube also has a screen that can plug when there is enough rust in the tank.I've disconnected the fuel line at the engine and used compressed air to blow the line open in order to make a diagnosis.

Answer 2

Piggy backing on the others

Combustion is fuel, spark , and air. Spark is most likely fully ruled out because you had enough energy to spark at park and idleso why not drive. So go after fuel and air. On the fuel side. Fuel pressure is constant within 1 psi regardless if in park or drive. If the engine is on, fuel pressure is constant. So find your shraeder valve and monitor fuel pressure with a gauge preferably - It should remain a constant pressure whether in park or drive. This will eliminate all fuel questions pre shrader valve ( pump , tank, filter). Now for the time being check the air side. Ask how can air be metered differently in drive. Welll you have different inputs now - you have increased throttle position, you are probably closed loop, different MAF inputs. A good diagnostic scan tool would be helpful. You could monitor MAF and throttle body position based on accelerator position. Also what happens when you go into drive? What about D3, D2, or D1? What about reverse and neutral- any effect - this would tell a lot.

Lastly is it when you give it gas or is it when you place the car in drive or both? More info please

Answer 3

It sounds as if the car is suffocating. As you know, the engine works by air being compressed in the cylinders and ignited to produce the power. If the air is not getting there then it doesn't work.

I'm afraid it's going to be case of getting out the technical manual to diagnose the problem or having a word with your friendly grease monkey.