Manifold question

[SwaintaN]

Ok 93 XLT, I need to do the exhaust system.. the whole system... I have muffler and back already, im getting a new cat convt, manifold for each side and the y pipe is there anything else I need? Also how hard, any tips?

 

[Tony H]

6 point Wrenches and Sockets for any hardware you plan on keeping. Sometimes a rusted up Metric bolt fits better in a Standard sized socket. Try to get a super snug socket on teh hardware so you don't strip it.
From the 'Y' pipe back, just cut it off and save time, jnuckle skin and some swearing.

 

[SwaintaN]

Im getting new everything.. im HOPING... the bolts come off just fine so i can take them and get them matched up with new ones... cant cut it... my MPG went from 250 per tank to about 150-175 per tank since I dumped the muffler and got a hole in the cat convt

 

[SwaintaN]

after seeing some complications that will come with it... ive decided to buy all the stuff and take it to a local muffler installer and have them install it all... hoping between new exhaust system and o2s ill get some of my mpg back, biggest thing is finding good decent o2 sensors that our exs like

 

[skderen]

If the exhaust overhaul doesn't work to fix your MPG issues, definitely clean your MAF sensor (costs like $6 for a can of cleaner that will probably last longer than your Explorer will given how little of it you have to use). Also you could have a bad FPR.

 

[SwaintaN]

cleaning the maf was the first thing to do and done.. i think my o2 senor is shot, what is FPR?

 

[Roadrunner777]

FPR=Fuel Pressure Regulator

 

[SwaintaN]

will that throw a code and where is it located?! lol sorry dummy here.

 

[skderen]

It may or may not throw a code. I'm not sure about your '93, but on my '94, it's located on the left side of the upper manifold, kind of underneath the big coolant hose. There are lots of engine diagrams on this site that will help you locate yours. Basically, it measures the amount of vacuum in your system at any given time while the engine is running and regulates the amount of fuel that is traveling to the injectors. If you have a bad FPR, you will be delivering too much (and therefore wasting) or too little gas to the injectors.

If you have a fuel pressure gauge, it's really easy to test. Fuel pressure should be between 30 and 45 psi with the engine running. You also have to do different tests to see how the pressure reacts to vacuum/no vacuum, let it sit for a bit and see how the pressure holds, etc.

It's VERY important to your MPGs that this is functioning properly.

 

[SwaintaN]

from what ive been researching it might be my o2 sensors cause i used a knock off brand and knock off brand plugs.... so ill havta look into the fpr next, wish i had the money i would say F it and yank the motor and refab it

 

[skderen]

I hear you on the money thing - and a new FPR from an auto parts store will run you about $70-$80. I justified it by saying that if this works, with gas being $3.59 a gallon, I'll make up the cost in no time, you know? I would definitely make it your next priority after the 02 sensors. Or at least find a buddy with a fuel pressure gauge and test it (FREE!!!, minus the little bit in gas you'll lose). It's an easy part to replace though, given where it's located and that it's just some hoses and two bolts.

 

[SwaintaN]

i gotta locate it first, plus i guess the codes that its throwing are the o2, took the one off near the cat and its black, thats what i get for trying to save money and buy cheap pos sensors..