Today my 2000 Dakota with a 4.7 started acting up. It idles rough and acts like it is going to stall and when you hit the gas it goes and is fine. Check engine light come on. I do not have a scan tool so I will try Autozone see if they can pull up code. Plugs have about 13.000 on them Bosch plus 2's Just did o2.s .

Any thoughts?

 

Clean your IAC, turn key on and off three times (do NOT start) and leave it on the 3rd time, and any codes should pop up in the odometer

 

i tried that once.. nothing every happens on my OBDII equipted (97')

But I agree with the IAC; and General tune up.

 

Got the codes

131 lean o2 upstream left bank
132 circuit issue o2 left bank
171 lean left bank
1494 Leak detect pump switch or mechanical failure

 

Check the fuses in the engine compartment.You may have a blown fuse.

 

Looks like a bad 02 sensor to start.

P0131 - 1/1 sensor shorted to ground
P0132 - 1/1 sensor shorted to voltage
P0171 - 1/1 fuel system lean
P1494 - leak detection pump switch or mechanical fault

 

Check the IAC Valve... I was having the same problems and replacing the O2 sensors didn't help. Put a new IAC Valve in.... problem solved

 

Check fuses ok.
There are 2 o2's on each side. It is showing left (drivers side) upstearm which I am assuming closest to manifold and it is new. The other 3 I just removed and soak them in gas for 24 hrs and put back in. new one could be bad.
The IAC was my first thought with the 1494 code than I wondered about fuel pump.

Today had it out and if I let off the gas and try to pick it back up it wanted to act like it wasn't getting any gas. I mash down on the pedal and it took off and ran fine.

 

If you are going to replace your O2s go with NGK. I replaced mine this week and the OEM ones in the exhaust were NGK. Don't buy Bosch brand. I made that mistake...

 

P1494 is not an IAC or fuel pump code.

The leak detection pump checks for leaks in the evaporative emissions system. There is a switch built into the pump and it can go bad.

How's your power steering pressure switch? Any leaks? Pull the connectors on the PCM and look for fluid. If the switch leaks it can wick along the wires and cause all sorts of weird codes.