1993 explorer dying problem

[vhillers]

Hey guys, long time lurker, second time poster. Well I have a 1993 Explorer with the 4.0 motor in it. A few months back it started having problems with surging and then dying while going down the road. So I read the message boards and since my sending unit for the fuel gauge went out, I decided to replace the fuel pump. When we got it back together Saturday it ran like a new explorer, no surging, dying and me no cussing. Well we drove it about 200 miles with no problems and I got in it this morning and the problem started all over again. I went and replaced the fuel filter and fuel regulator. So i went for a drive again and it drove great, but when i got back in it to come home it did its thing again. I then went and replaced the air temp sensor, MAF, and new plugs and wires When I hold the gas pedal to the floor it doesnt immediatly die, it bogs way down, like sucking more air than anything, then dies. I'm stumped.. Last things that i could replace would be the TPS and o2 sensors. When i come to a red light it idles funny like it wants to die but doesnt. And when i give it gas when it want to die it make this real bad knocking sound. Thanks in advance

 

[BrooklynBay]

Did you clean your IAC? It might be a good idea to replace your coolant temperature sensor if this problem only happens at certain temperatures. Try the IAC first since it sounds like your problem.

 

[vhillers]

When i drove it the other night, i drove for about 2 hours straight with no problems, got in it the next morning and not even 2 min it acted up. And when it does act up it does it at 65-70 mph and sometimes at 20 mph.

 

[Runnin'OnEmpty]

Vhillers, that certainly sounds like the problem's fuel related, but since you've already replaced everything.......?

Does it show any codes at all?

Only other things I can think of is maybe an ICM (Ignition Control Module)going bad, or possibly a bad CPS (Crank Position Sensor). Both of these should trigger a code, however.

 

[BrooklynBay]

When it acts up, do you have a check engine light on the dashboard, or does it disappear? Your PCM relay, or fuel pump relay could be starting to go. These parts won't show a code. If the PCM loses power from a faulty relay, it will appear code free when it is scanned, since it lost power.

 

[vhillers]

It comes on for maybe 2 min before it acts up then goes off.

 

[BrooklynBay]

If it goes on, and off, then you have a code stored. I would suggest that you have it scanned to find out what is causing your code. It might be the part which is causing your problems.

 

[vhillers]

Well its been a few weeks and i changed the o2 sensors. I started it back up and ran crappy. A friend of mine was over and told me that the Cats were probably clogged, so I ended up cutting the muffler off and just running the 2 cats. It ran really good but started acting up again, not as bad but still messing up. I threw a code reader on it again and it told me that the MAF was/is grounded. i unplugged the maf and there wasnt a change in idle, but it doesnt want to die now. The Maf is new, so i took it back to Auto Zone for a swap out. But still doesnt change idle when unplugged....

 

[ma96782]

Sounds like a COLD start problem:

Explorer Cold Start Problems

http://www.explorerforum.com/forums/showthread.php?t=164960


ACTS/ETC Sensor:

http://www.explorerforum.com/forums/showthread.php?t=133987


Aloha, Mark