Where to begin, i guess it started the other day when i was driving home from work. The car would stumble hesistate real bad under very light accel but clear right up if i hit it hard. TPS maybe?

Then i noticed my headers glowing orange while letting the car warm up, doesn't smell rich, and its all cylinders, so i am assuming lean.

Check engine light has been flashing for 2 days now. I finally got around to getting it scanned.

P0300
P0200

I have dealt with the random misfire code before when i burnt a wire after the header install. But P0200 is a new one.

Has anyone had any luck with this code, all my searching left me still looking for a clue where to start. Seems a few people have had the problem, but no update on the solution.

Thanks

Could the P0200 be causing the random misfire code? It seems people get a specific cylinder misfire with the code, no a random misfire code.

Any help would be great.

Thanks

 

Hi,(Injector circuit malfunction). P0200 .Got it from Autozone Info pages.Hope this helps.It said for OB2 systems.

 

Do not use a generic code list or trust others. ALWAYS start with Shoebox's LT1-SPECIFIC code list. The OBD-II "tab" is at the bottom of this page:

http://shbox.com/1/Dtcs.htm

One (or more) of your injectors has a fault in the electrical circuit. That can easilly cause a misfire. If you have access to an OBD-II scanner with "GM enhanced" parameters, you can access the misfire count for each individual cylinder, which may point you to the correct injector.

An inexpensive set of 'noid lights will allow you to test each injector for a complete electrical circuit.

Alternatively, with the key on, check to make sure you have +12V at the pink wire on each injector harness connector (the PCM supplies the ground to fire the injector). If you have +12V on all injectors, then pull the connector off and check the resistance of each injector across the two pins. Should be in the range of 12-15 ohms.

 

Well, i went out on lunch and did the old "unplug the injectors while running test"

It told me that nothing changes when #1 is unplugged, all the others make the idle worse.

So, that solves that, for now at least. My other concern is this, could that one injector be causing the multiple misfire code? Or would it cause a misfire on that particular cylinder?

Thanks

 

yes, and yes
if the injector is stuck open(electrically) to such a point that the plug can't spark, then the PCM will see HIGH oxygen content in the exhaust and ADD fuel to all cylinders, injector is not flowing, same thing

if the injector was adding too much fuel, but not so much as to kill the spark, the PCM would pull fuel due to a low oxygen exhaust