So the short version is the car ran out of gas, started dying while driving//not starting etc. etc... I originally thought it was the fuel pump but after going around the block and a few HUGE backfires I brought it to the shop and they said my ignition module has moisture or oil in it and its shutting down the fuel injectors, or something to that effect.

Anybody have any experience with this?? Just get a new module? Why is there moisture/oil in it?? haha

Any help would be GREATLY appreciate it

 

Are you sure they didn't say you had oil or moisture in the Optispark distributor? That would make more sense. When the Opti optical sensor low resolution pulse fails, the PCM shuts down the fuel pump and the injectors.

When you run out of fuel, there's a good chance the fuel pump was damaged. Did anyone check the fuel pressure?

 

The stock fuel pump (and most fuel pumps for that matter) are internally lubricated by the fuel itself, when you run the tank dry you can damage and/or overheat the pump and burn it out, or at the least shorten it's lifespan. Doesn't the same go for Injectors?

As for getting anything "in" the ICM I don't think that's really possible, maybe it is but the stock GM Ignition Module is pretty sealed up.. You can take just the ICM into any Autozone and have it tested, takes less then 5 minutes.. Other then that I'd look into what Injuneer pointed out about the Opti, that's probably where the problem lies.

 

Thats what he told me... he wanted to do like 700dollars worth of work just to figure out what the problem was, so I took it home, replaced the ICM and all was well for about 45minutes, I scraped the bottom on a hill and the 02sensor unplugged and it started running sketchy again, the plug for the drivers side 02 sensor is like melted on the side of my longtubes! so I unplugged both 02 sensors and everything was fine for like 2hours driving but it still feels alittle sketchy sometimes.

could it be some old (few month) gas working its way out?

heres the codes from the mechanic:

P0155 02 Heater Bank 2 Sensor 1
P0372 Timing Referance "A" too few 24x pulses
P1361 Ignition control circuit not toggling or grounded stored in memory


THANK YOU AGAIN FOR ANY HELP :/

 

For starters, your mechanic is using the incorrect (not LT1-specific) trouble code list. Use Shoebox's - it is specific to the LT1 (tab at the bottom allows you to see OBD-II codes):

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

He got P0155 right. Was the connector melted before you manged to bottom out the O2 sensors on a hill?

P0372 = Optispark distributor loss of high resolution pulse

Indicates a problem with the optical sensor in the Optispark. Could be the result of moisture or oil in the Opti (as suggestd in my first post). Could be a problem with the Opti wiring harness being corroded or damaged. If the engine is running, this a "stored" code, because when the PCM loses the high resolution pulse pattern, it shuts down the fuel system.

P1361 = Ignition control circuit "low"

Evaluates the circuit continuity on the IC Module and balance of the ignition control circuit (including signal on the white wire from the PCM, the coil, and even possibly a problem with the Opti) due to a short to ground.

First, fix the O2 sensors, and the wiring harnesses. Which O2 sensor has a melted connector? Your engine has 4 O2 sensors, one on each bank of the engine before the cats, and one on each side after the cats. P0155 is for the after cat sensor on the driver's side. Which O2 sensors did you "unplug"? The 2 after-cat sensors will not affect how the engine runs. The two pre-cat sensors will. If the car runs better without the O2 sensors connected, either the sensors or the wires are bad, or you have something causing them to give the PCM incorrect info, as in an exhaust leak before the O2 sensors, or excessive misfires.

 

Thanks Injuneer... yes the connection was melted before i bottomed out.. also its the two 02 sensors plugged into the side of my jet hots (the drivers side is melted).. I dont have any cats

I guess ill check out the opti tomorrow and let you know whats going on with it


Thanks again!

 

If you don't have cats, and you don't have after-cat O2 sensors, how did you eliminate the codes - SIMS, or programming, or not at all?