I have a 1998 Dodge 1500 4x4 with 5.2. It has 100,000 miles. It threw multiple misfire codes and the check engine light was flashing. Had it towed to have it looked at by a transmission shop, he said it had gas running out of the exhaust and he thought the catalytic converter had gone bad. Took it to a shop for repairs and all they did was replace cat and it ruined it on the 10 minute drive home. Did not fix the fuel problem. I found a set of ground wires coming from the fuse box and grounding to the fender under the battery. The old battery had busted and leaked acid and the ground wires were very corroded. I cleaned them and got all the corrosion removed. I have checked the fuel injectors with a tester and all of them open and close and fuel pressure holds steady for over 15 minutes after the ignition is turned on then off. Checked each injector connection with a noid light and all are flashing. I am wondering if the issue could be that the injectors lost ground and stayed open, dumping fuel into cylinders and ruining the cat?

Any help would be greatly appreciated.

This is the set of ground wires that were corroded.

 

No, if anything the injectors stay closed when they lose ground. Actually the injectors don't have a permanent ground, they receive 12V from the ASD relay and the PCM grounds them to inject fuel.
Flashing CEL is almost always ignition related misfire. If the air/fuel mixture in the cylinder doesn't get ignited the gas accumulates in the catalytic converter and ultimately kills it. I'd rather check the coil, possibly rotor in the distributor.

 

Thanks. I replaced the plugs, wires, distributor cap, rotor button, and coil after I had it towed home. When the transmission guy looked at it and saw the fuel coming from the exhaust it had the new parts.

 

There's a remote chance that the engine is running super rich but I've never seen it so bad to cause misfires. Do you have an OBD2 reader that can display live data ? Engine coolant temp or intake air temp could be way off due to a broken circuit. Also what do fuel trims read.

 

May want to put a fuel pressure gauge on it and see if it drops when the key is off. Sounds like it could be a stuck "on" injector. See what the pcm is seeing for the temp also.

 

I did use a fuel pressure gauge and it held the same pressure for over 15 minutes. Pressure dropped when testing injectors using a tester and pressing pulse.

 

Thank you for the suggestion. I do have an OBD2 reader. I have never tried to use it for live data and not sure if it can or not but I will check and see if it can.

 

I would see what the pcm thinks the engine temp is.