Hi Everyone,
I Have a 92 Jeep Cherokee 4.0 245,000 only 70,000 on a new engine. I'm having random flooding causing large amounts of black smoke on startup and stalling when driving I have had this problem before and replaced the TPS and I went away about a year later it's back and just replace the TPS under warranty and I didn't fix it so I need some help I am very mechanically inclined. I have checked all sensors and reset the computer and checked all the spark plugs and gap. Don't know if related but I replaced the motor mounts with brown dog urethanes and also the dizzy due to the old one having a failed seal. So Fire Away

 

Possibly some injectors are not closing? Im not sure

 

The coolant temp sensor could be sending wrong information to the PCM. If the PCM thinks the engine is cold it will want to add fuel.

 

Sorry for taking so long to reply. I have checked the coolant temp sensor and it is within values but I might just replace it just because. I might just have to pull the fuel rail to and check the injectors. When I have time I guess.

 

No need to pull the rail just yet. Put a fuel pressure gauge on the test port and let the engine run for a few minutes. Now shut the engine off and watch the gauge, it should hold pressure. If it drops to nothing quickly then you should start looking at the injectors to determine which one is the culprit.

 

Yeah I'll do that tomorrow and see but I have a leaking o ring so I have to anyways.