New Mustang Owner Need Help

Jalarcon32 said:

I recently bought a 89 5.0 lx and have never been mechanic savy. Never grew up around cars so I'm in need of a seasoned vet to help walk me through potential upgrades. The 5.0 is completely stock and has no upgrades what so ever. The first thing I'm looking to add is a stronger exhaust to make it sound more aggressive. The issue I'm running into is deciding which way to go and if I need to buy headers and the h pipe along with the exhaust. I have no reason to race the car just wanting a mean sounding stang to cruise around in. It's an automatic convertible and everything still works, even the stock speakers it originally came with. If anyone can please help me out, I'd greatly appreciate it.

Click to expand...

Full length subframe connectors are a good start to keep your car from twisting. And if you're looking to make the car faster, cheaply, some 3.73 rear gears. ~$400 for subframes and ~$500 for gears including labor will really change the car.

First of all be prepared to spend $400-$600 plus shipping for mufflers and tailpipes. That price does not include the H pipe.

For a car that is meant to be a street cruiser, stay away from dumps (mufflers with very short or no tailpipes). The exhaust will tend to fill up the cabin in slow or stop and go traffic.

Avoid anything too loud - that includes 2 chamber series 40 Flowmasters. Too loud means that you can't hear the pretty lady sitting next to you whisper sweet things you want to hear. It means you have to turn the volume up on the stereo to the discomfort level to enjoy the music. It also means the car is unpleasant to drive for more that about 30 minutes at a time at highway speeds.

Warning - all chambered mufflers and that includes Flowmasters, tend to drone. About 1700-2200 RPM which is highway cruse speed, the exhaust has an annoying resonance that makes the sound of the exhaust louder at those speeds than at other speeds.

If you are wiling to put up with the drone 3 chamber series 50 Flowmasters are a good choice. Try to stay with 2 1/4 exhaust pipe - it fits better and sounds better - less drone. The result is a smooth powerful exhaust with no raspy sound. It's like a musical instrument that you play as you go through the gears.

AutoZone, Advanced auto Parts are good local sources for exhaust.
Mail order specialty stores like Summit Racing ( https://www.summitracing.com/ ), CJ Pony Parts ( http://www.cjponyparts.com/mustang-parts/c/60000000/ ), and Late Model Restoration ( https://lmr.com/1979-93-Mustang ) are good places to look online.


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 down hill 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.

Don't bother with headers on a stock motor. Get a good catback system like Flowmaster.dynomax, Borla. or MAC. As mentioned, the first thing to have instaled are Max Motorsports full length subframe connectors. These cars ar unibody and are known to flex and rattle over each bump. That will tie the front and back subrames together. Next, the best performance bang for the buck is a set of Ford Motorsports 3.55 rear end gears. Your car came with either 2.73 or 3.08 gears. By going with the lower( yes they are considered lower even though numerically they are higher) gears, it will increase the acceleration off the line. You can get the complete install kit from Late Model Restoration or American Muscle for around $250 before the Stangnet discount. You will also need to get a different speedometer gear to put in the transmission to compensate for the different rear end gearing. You can get this as wel from those vendors for around $15.

Welcome and feel free to ask as many questions as you need to, Everyone here has done whatever you could imagine to these cars and are here to help.

But where are the pics?