Car problems!!

[chancellor17]

Ok so about a week ago my car started then shut off after about 3 seconds and it does it over and over again. So I checked under the hood and I noticed my fuel pressure regulator was leaking gas. I purchased a new installed it. Today my car did the same thing it starts then dies again what can it be?

[Explicit_Spade]

Is the check engine light on?

[dsmuts]

What do you drive?

[chancellor17]

Yes but it's only cuz I don't have a cat 02 Grand Prix 3.1

[Explicit_Spade]

Is the check engine light on?

Is the check engine light on?

[chancellor17]

Yeah but it's p0420

[Explicit_Spade]

Catalyst System Efficiency Below Threshold (Bank 1).

The easiest thing to do first is a visual check of things. Visually inspect the exhaust system for leaks, check the catalytic converter for dents, holes, severe discoloration, and check for a rattle inside. If any of those syptoms are there, the converter likely needs replacement. Then, visually inspect the downstream O2 sensor (behind the converter). Check for broken wires, obvious faults, etc. If all that checks out, you'll want to check the operation of the O2 sensor. To do that, you'll need access to a scan tool or oscilliscope. Check that the waveform is pretty steady. If the reading fluctuates then the sensor is likely bad and will need to be replaced.

[dsmuts]

Unplug your mass air flow sensor and see if it starts

[chancellor17]

I got it to start by starting it with my remote start

[Explicit_Spade]

How long have you had remote start?