09 Saturn Outlook P0087, P0089 reduced power mode white smoke

Earlier today the car started throwing a fit when I left the neighborhood. I was sitting at a stop sign ready to pull off when “reduced power” message came on along with the CEL and once I started to take off from a stop it seems to have started misfiring. Looking behind me I noticed a little bit of white smoke from the exhaust. Very strong smell of exhaust inside the vehicle. Immediately turned around came back home. Let the car sit for a while turned it back on and it was running fine, although the CEL was still on.Here’s the codes I found P0089 P0087 and P00420, the 420 has been on there forever but the 87 and 89 are new. On my way to autozone to get the codes pulled I gave it the beans even uphill to see if I could get the issue to come back, ran absolutely fine.I know the 87 means low pressure at the rail but is it perhaps possible that a stuck open injector could cause the low rail pressure and white smoke? Fuel filter? Pump? I have no direction, please help me.

From the sounds of it is either a injector issue ,a wiring or a pcm injector driver issue. Since it did not flag a injector circuit code I would start with hooking a scope up to the injectors and look at a current waveform and a injector voltage waveform. That will determine the next step. Also check wiring going back to pcm for each injector and look for melted wiring or short to ground / bare/nicked wiring.

Thanks, I don't have a scope but I'll be sure to check the wiring for damage. I have a multimeter is there a way I could utilize that?

One thing you could do is a voltage drop test which you would hook the positive probe to the power feed of each injector and negative probe to ground at battery negative. Start car and see if one reads zero volts all the time. Other wise you could purchase a fuel pressure gauge and hook it to the fuel rail test port and see if fuel pressure drops to zero once the engine is shut off. (Also make sure fuel pressure is near specifications. Should be around 50 psi) If it does drop to zero quickly then you have an injector stuck open. You will then need to lift the fuel rail up with injectors still in rail and then have someone turn key on to see if one leaks/sprays ((((((make sure engine is cold when doing this test)))))!!!!! If one is leaking turn key off. At this point you will have to replace the injectors. As you remove the injectors capture the fuel in a small plastic jar look at the fuel it should be clear yellowish. If it looks dark or dingy green/yellow you may have another issue of a fuel pump failure.

If fuel pressure do not drop then your next suspect would be the fuel rail pressure sensor. When these go bad it commands fuel pump on more often or keeps it on causing higher rail pressure and makes car run really rich. This is where having the freeze frame data is helpful because you can look at o2 sensor readings and rail pressure and fuel trim numbers if it's running rich then rail sensor is top of the list to check and see if it matches a pressure gauge. If not it will need replaced.