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Proud New Owner of an 97 Explorer..few questions

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Old 08-15-2013, 09:10 PM   #1
reppard
Atlanta, Georgia
1997 Ford Explorer XLT
 
Join Date: Aug 2013
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Proud New Owner of an 97 Explorer..few questions

Hello everyone,

I bought a 1997 Explorer XLT 4.0 OHV a few days ago. It was a single owner vehicle. I paid 800 bucks for it. Only down side I saw was the number of miles on it. It still has the original engine and transmission and they have about 338k miles on them. This thing has been taken care of. It runs great for the amount of driving thats been done in this thing. Things that I noticed was a bit of a rough idle and a little bit of bogging down on the accelerator. Soooo now a few questions.

First thing I did was get the codes. I had P0171 and p0174 along with about 4 cylinders with misfires detected and a few other codes. I checked for vacuum leaks as best I could. I figured before shelling out all the cash for 4 O2 sensors I'd replace the intake manifold o-rings. I bought a pack of upper intake o-rings.

Question 1: The pack came with 6 o-rings but I only saw places for 3... where the hell do the other 3 go?!

After I got it all back together it drove for about 18 miles before P0171 and p0174. No cylinder misfires yet so that was a good thing. Today I replaced the PCV hose and the 2 pressure hoses for the EGR valve. I hit the throttle bottle with a bit of MAF cleaner(they had no Ford safe throttle body cleaner). I put about a half a bottle of Seafoam in the gas tank and the rest I sucked into intake through the Brake Booster hose. This thing seems to run ALOT better. I did notice that the temp gauge wasn't coming up much on this thing. So I put a coolant temp sensor on it... I think its the wrong part, should have been the sender unit which I will pick up tomorrow.

Question 2: How likely is it that the old sender is dead or is it just the thermostat stuck open.

Question 3: Anything else I should watch out for or expect on an engine with this many miles?

Thanks for reading and glad to be apart of the forum. Hope I can contribute as well!
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Old 08-16-2013, 01:00 PM   #2
masospaghetti
Charlotte, NC
2000 Sport, 5M OHV RWD
 
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Go ahead and put a new thermostat in it, cheap insurance and easy to get to. Would be a good opportunity to check/replace worn hoses and renew the coolant.

I think three of the gaskets go under the fuel rail assembly - I might be wrong here.

The 4.0 OHV is mostly notorious for poor valvetrain lubrication. If there's not a lot of tapping noise (indicating worn rockers and pushrods) you should be in good shape. I would always recommend a good synthetic oil to help keep this wear to a minimum. Other than that, the 4.0 OHV is an extremely reliable motor.

Congrats on your new vehicle!




__________________
2000 Sport, 4.0 OHV, 5M, RWD, 174,000 miles
1996 XLT, 5.0, 4A, AWD, 156,000 miles
1998 XLT, 4.0 OHV, 5M, 4WD, 226,000 miles
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Old 08-16-2013, 08:34 PM   #3
reppard
Atlanta, Georgia
1997 Ford Explorer XLT
 
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Quote:
Originally Posted by masospaghetti View Post
Go ahead and put a new thermostat in it, cheap insurance and easy to get to.
Any tips on that bottom third bolt =) Looks like a pain in the ass to get out.

UPDATE: I got it out, wasn't too bad with my ratchet extension. Good news is it will actually heat up to operating temp now! Time to see if it will pass emissions....

Last edited by reppard; 08-17-2013 at 09:38 AM.
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