Fox Thinking About Getting A Restored 1986 5.0

Gearbanger 101 said:

The '86 auto cars were all CFI (central fuel injection), not the more popular and mod friendly SEFI that was used in the 5-speed and later model year Mustangs.

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CFI was on 85 AOD equipped GT's. All 86 GT were SEFI car's, albeit with a one year only restrictive small runner/small TB upper intake. They also had one year only shrouded valve heads that are not conductive to performance, as well as flat top pistons that make head/cam swaps more difficult due to valve clearance issues.

That said, the car looks clean and nice. But as it has been pointed out, if you need us to convince you to get it then you really don't want to do it. If you were originally looking for a 99+ GT then that's what I would go with. You're selling yourself short if you settle for something different. I love foxes, 86's in particular, but the newer mustang will be better in nearly every way as far as daily drivers go.

Foxes are funny. Sometimes I see a clean example sell for ridiculous money and then other times they just lay there. If your end goal is a flip pass. With that trade there won't be any profit in it for you at the end.
That would be a great cruiser/show car. I would love to hold onto it and collect trophies with it. My only turn off is the red interior and the auto transmission. This will hurt your resale. Everyone wants black on black with a 5 speed.

If you are buying the car for a show car/weekend cruiser, you'll probably be OK. If you want it for a daily driver, you might want to consider something else.

Welcome to Stangnet...

Not all of us know how to fix everything, but some of us know how to fix some things
with excellence!

Places to check out here on Stangnet:
http://www.stangnet.com/mustang-forums/threads/technical-thread-how-to-index.808661/ How to do it tips for some of the most common problems and upgrades for 5.0 Fox body Mustangs.
http://www.stangnet.com/mustang-forums/threads/the-official-progress-threads-thread.761371/ the collection of build/progress threads from Stangnet members. You get to find ideas and clues to what works well and what doesn’t.
http://www.stangnet.com/mustang-forums/resources/ Has tech tips for common problems on Mustangs.

If you are in California or some other state with strict emissions laws, part of the deal should be that the owner takes the car and has it emissions tested. If it passes, you buy the car and pay for the emissions test cost, if any. If it does not pass, walk away from the deal. For a mechanically inexperienced owner, emissions related problems can be difficult and expensive to fix. Avoid any car that was originally EFI and has been converted to carb like the plague. That's often a clue to the fact the previous owner had problems and the resulting hack job has MORE problems.

Keep in mind that states with strict emissions laws may make the go faster goals more difficult to reach. Some parts are OK to replace with aftermarket parts and others aren't. Check carefully before you get out your wallet and buy something you can't use in the area where you live.


If you want to do the fix up & power up thing, make sure that you have some other form of reliable daily driver. That way the stang can sit while your wallet and hands take a rest from the last project that didn't quite get finished on that 3 day weekend. Things always cost more and take longer the first time you do them. Having some other working vehicle makes life easier since it isn't the big crush to get it running for the Monday morning drive to work or class.

Plan on spending some money on tools it you don't already have them. The stang has both metric and American fasteners, so you really need two sets of wrenches. A timing light, digital voltmeter, vacuum gauge, compression tester, fuel pressure test gauge and fuel line coupler tools are some of the test & tuning tools you'll need. Visit the pawn shops and sometimes you can find a deal on tools & test equipment if you stick to well known name brands.

A sheltered work area is almost a must, someplace that you can leave the car in pieces without upsetting anyone. Some guys here have changed a transmission in the parking lot of their apartment in a rainstorm, but they will tell you it wasn't fun. Depending on where you live, a warm, dry garage is a nice place to do the winter projects that stangs tend to become.

EFI (Electronic Fuel Injection) Computer - every stang after 85 has or had one: don't let it intimidate you. The computer based EFI systems are not hard to fix and most of the time they tell you what's wrong with the engine. Here's a book that will get you started with how the Ford electronic engine control or "computer" works.

Ford Fuel Injection & Electronic Engine Control 1988-1993 by James Probst: ISBN 0-8376-0301-3.

It's about $35-$45 from Borders.com see http://www.amazon.com/ . Select books and then select search. Use the ISBN number (without dashes or spaces) to do a search

Use the ISBN number and your local library can get you a loaner copy for free. Only thing is you are limited to keeping the book for two weeks. It is very good, and I found it to be very helpful.

For lots of great ideas and tech notes on upgrades and repairs, be sure to check
out http://forums.stangnet.com/showthread.php?t=643651 “Useful Technical Thread Index” sticky at the top of the 5.0 Tech forum.

Things that break often:
T5 5 speed manual transmission (syncros go bad, mostly 3rd gear)
TFI Module (Thin Film Ignition module - mounts on the distributor)
Electric door locks (see the link in my sig for a cheap & easy fix)
O2 sensors(oxygen sensors) They are good for about 60,000 miles and start to go downhill after that.
TPS Sensor (Throttle Position Sensor) causes flaky problems with idle & acceleration.
Fog lights They overheat the wiring and cause the headlights to flicker. The fix is cheap and simple if you can do electrical stuff.
Harmonic Balancer – they separate between the hub and outer ring. A harmonic balancer puller is a must have to change it. You can rent or borrow a puller from most of the larger auto parts stores.

Things that are very durable: Engine - as long as it hasn't been abused, it will run good for 150,000-200,000 miles without an overhaul
Rear axle - other than an occasional case of worn clutches in the traction lock, they almost never have problems.
Computer - believe it or not, the computers seldom have problems of their own. Most of the problems are with the sensors and the wiring.
Suspension – the front and rear suspension has very few problems if the car hasn’t been wrecked or seen a lot of drag strip runs. The drag strip runs tend to distort and tear the mount points for the rear axle control arms. Revving the engine up to 4000 RPM and dumping the clutch with slicks or drag radials tends to break things.

Things that don’t break often but are hard to fix:
Water pump mount bolts – they corrode and shear off when you try to change the water pump.
Rear oil seal on the engine – lots of parts to remove to get to a $20 seal.
Power steering pump – the pumps are noisy and the pulley requires some special tools to remove and install. If you have the tools, they are easy to do. Again, the larger auto parts stores will rent or loan the tools for the pulley.
Power Steering rack - it is hard to get the toe in set so that you can drive the car to the shop to get it properly aligned.
Starter – the top bolt is hard to get a socket on if you don’t have the right combination of socket, universal joint and extensions.

Everything considered, 5.0 Mustangs are not hard to work on. They just require some patience and though before you get started.

zakarha said:

I had a guy offer me 5,800 for my truck today I told him if he'd bring me 6,000 cash tomorrow I'd do it, I guess that will be the deciding factor on the foxbody. Theres a really nice competition red 2000 GT with tan leather interior for 6,900 on craigslist but maybe I could get him down to 6, anyone know a value on that? Its not really a lot of options other than the leather and it has 77k miles on it. Its almost show room quality though

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If you want to daily drive a mustang, a 99-04 would be your best bet.

tamadrummer88 said:

If you want to daily drive a mustang, a 99-04 would be your best bet.

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Tama, seriously what is with...?? But yeah man stuff will prob start to fail on you in not such a long time if you were you were driving it everyday and in my experience foxes (and I guess any "classic" vehicle for that matter) are worth whatever someone's willing to pay.