Big problem don’t know what to do

[Mikeosaji]

Yep OBD1 readers still exist in plenty. My point was not that you couldn't buy one from a parts store, but those that offer free code readings like AutoZone generally do not have one for store use so they won't scan an OBD1 vehicle for you.

Did you find any codes?

Codes-111,10,157,172,176

 

[Dirtman]

157 is an electrical issue with the MAF sensor, 172 and 176 are o2 sensor lean codes.

OBD-I Diagnostic Trouble Code - Ford 3-Digit Codes - The Ranger Station

Differences in test mode noted as: (O) = Key On Engine Off test (R) = Key On Engine Running test (M) = Memory code Code Definitions 111 System checks OK 112 (O,M) Intake Air Temperature (IAT) sensor is/was low … Continued

www.therangerstation.com

I would start by removing the MAF and checking the connection for corrosion or broken wires and clean it (use proper MAF cleaner)

 

[wildbill23c]

1994 does not have an OBD2 port. I highly doubt any of the chain parts stores will have a code reader nor will they know the correct process to scan codes on pre-OBD2 vehicles.

As for your problem, it could be one of many possibilities. The big question is: how mechanically inclined are you? What do you have for tools, test equipment and knowledge about fixing vehicles in general?

If your answers are something like, not much, I would suggest having a mechanic look at it. There is no sense in throwing parts at it just because some people on the internet suggested you do so.

Chain part stores don't have code readers for EEC-IV/OBD1 and neither do a lot of Ford dealerships, hell they haven't seen one of those trucks in 20 years LOL. I asked my aunt a while back about taking my 87 Ranger in to have it gone through by a dealership, she said don't bother, they have no idea how to work on it and she works at a Ford dealership so yeah don't count on your Ford dealer having stuff to work on one of these trucks....and I wouldn't want a part store monkey messing around under the hood either.

I think I paid $30 for my EEC-IV code reader and it came with a manual with a list of all the codes...that's the direction I'd go if ya wanna keep the truck, otherwise forget it and part it out or whatever, because otherwise they're pretty dumb computers back then. Could be a plugged cat, could be fuel pressure related, who knows without the codes, so many possibilities.

 

[lil_Blue_Ford]

MAF can definitely throw things out of whack, cause running issues, lean codes and the like. Check the wiring and plug for damage, check the air filter and air box. Try spraying the MAF down good with MAF cleaner (think carb cleaner is OK if you can’t get the specific spray. Take it off the vehicle to spray down and make sure it’s good and dry before putting back in. Fixing whatever is messing up the MAF or replacing it if it’s definitely bad will likely resolve the O2 lean codes, so the MAF code is the one you want to attack first.

 

[Dirtman]

Carb cleaner is not an acceptable alternative to MAF cleaner. It will leave a residue on the filament especially if its chlorinated which most are. Some electronics cleaners are acceptable but they cost just as much as MAF cleaner anyway.