swooshonln

I have a 99 gt. Here are my questions:


1) My car has about 80k miles on it. Do I need spark plugs if the car runs ok? They have never been changed to my knowledge (or anythign else like fuel pump filter, etc) I am the 3rd owner

2) If I do need new plugs, what ones do I buy?

Shelbyville

My thoughts are, if its not broke, don't fix it, but it certainly would not hurt to replace your plugs and fuel filter. At least you will now have a starting point for maintenance. When I bought my 02 last year, I replaced all the fluids including coolant along with plugs and filters. This way, I know when it was done. Stick with motorcraft replacement parts.

swooshonln

ok well... I get about 160-200 MPT (Miles per tank) depending on if i drive hard or not. Would that be a fule filter problem?

What about my tranny fluid? its an auto

Shelbyville

Driving habits affect gas mileage more than anything. Other factors come into play such as dirty air filters etc....but you can gain the most by changing your driving habits. I have a 5 speed so I can't comment on auto but again, if you change anything, at least you know for sure it was done with quality fluids, assuming you choose to use them, and you have some maintenance record for you benefit.

ezerojas

If you have never had the inline fuel filter changed, by all means, change that sucker. But a restricted fuel fileter is not going to affect your gas mileage. You'd feel a major drop in performance (flat on hard accel and heavy load / low RPM) if it was highly restricted, not a mileage problem. Plugs on the other hand...They can affect your mileage.

You stated earlier "fuel pump filter" which technically refers to the "sock" filter on the pump body inside the fuel tank. That is never replaced, unless you hadyour ex dump a quart of sugar in your tank. I just wanted to clarify you probably mean the inline filter (under the car body) which is regularly replaced and is intended to protect the fuel injectors (much finer filter media).

As for the trans fluid, it wouldn't hurt to have it replaced. If you don't know the history of the car, it is better to be safe and not run around with toasted fluid.

swooshonln

that makes good sense... when I am at low rpms and I stop on the gas, my car haults for a seccond like its bogged down or waiting for fuel... are the inline filter hard to replace?

ezerojas

It canjust bemessy/stinky work. I don't remember if your 99 uses the plastic clips to secure the filter to the line, or if it uses the newer Y2K+ spring clip lines. If the latter, better off taking it to a decent lube joint or a shop if you are inexperienced. You can easily bugger up the internal line clips even with the right tool.

It is located near the gas tank near the axle housing. Someone with a 99 on this forum may be able to give you a careful walk-thru.

Tip: put out that cigarette first.

Cornbread01

wrong thread my b

Blowby01GT

i just changed my plugs at 60k but ive been told to change them when u get some miles like u have on ur car, it will relieve some engine stress when starting ur car, and keep ur car in better shape for the long run, my spark plugs where worn down bad at 60k but i do alot of stop and start driving and shutting engine on and off!

RC02GT

whats the best plugs to get?