OK I have a 1990 Dodge W150 318 5.2, it is running extremely rich. The truck feels like it is miss firing. I have put TPS, map sensor, catalytic converter, O2 sensor, plugs, wires (plugs are gapped correctly, distributor is in correct timing, wires are good, and a brand new coil). The only thing I have not done is the EGR valve but not sure it would cause that major of a symptom. I have a code 51. Plugged my scanner in and it says my O2 sensor should be running lean. My CTS is getting the correct amount of voltage. When you look into the butterfly valve area you can see the fuel from injectors puddling on the butterfly valve. Someone please help!!!

 

There should be no puddling. Sounds like injector problems. Engine running. Look down in the throat of the throttle body to check the injector cones. There should be a fine cone of fuel with no gaps and no streams at the base of each injector. The cones should reach the sides of the TB. Low ambient light and a flashlight shows the cones best.

 

the are coning fine is just running rih i just checked it.

 

Have you checked the water temp sensor for the computer? If it is not working the computer may think the engine is always cold and therefore give a richer mixture all the time which is what it does when it is cold.

 

my scanner said 2.8 volts to about about 3.4 volts. the scanner also said it was running at normal temp im completely lost. i apperciate the help. i love this truck. i just want it fixed lol. neveer left me sitting you know. ever when it does run like poop. oh yeh i got temp sensor im going to put it in for ****s and giggles see what happens.

 

ok put the cts in running about 90% but still runs funny i got the egr valve going to puit it in see what happens.

 

does it seam like the miss is random? could be a bad distributor.

 

ok put the egr valve in today. its running a hell of a lot better but it feels like its missing more at low rpm's?

 

does the 318 motor have a icm?

 

im going to try the plug because i put them in when it was running like 50% so they are prolly fouled out.