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Old 08-15-2014, 10:21 PM   #1
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Car issues

Okay my name is Alysha Chavez and I have a white 1989 GT Foxbody. I am having some issues with her. She starts shaking really bad whenever I go up hills at a constant speed or I accelerate to get onto the freeway when I go faster then 35. I can feel the shaking a lot in my steering wheel. She is an automatic so no shifting involved. I also hear this knocking sound but it doesn't seem to be coming from my engine bay. When I try to accelerate it doesn't seem that she picks up speed like she should as fast either. I'm worried about her and I don't want to be stranded somewhere. I have been told two different things possibly my fuel pump or the EGR Valve. Also another issue but it may not be a problem is that my oil temperature seems to jump around a lot. Every time I stop it goes down to 0 and then when I get going again it seems to go up and then sometimes it just stays at 0. But it sure moves around a lot. Could anyone help diagnose my problem? Oh by the way I changed my fuel filter and that didn't fix or help the problem.
Thanks
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Old 08-15-2014, 10:47 PM   #2
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The lack of power and bucking could be caused by the fuel system.
I'd start by checking the fuel pressure.
A tune up wouldn't hurt either.
Get your tires checked for the shaking in the steering wheel problem.
You'll need to be more specific for help with the knocking noise.
The fluctuating oil pressure is common because the gauge is probably faulty after a few decades of use.
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Old 08-15-2014, 11:00 PM   #3
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Okay how could I be more specific with the knocking
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Old 08-15-2014, 11:20 PM   #4
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Can you be more specific as to where the noise is coming from? Front of the car? The back?
Does it do it going over bumps?
While accelerating? Decelerating?
While braking?
Etc....
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Old 08-16-2014, 12:36 AM   #5
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The knocking only happens when my car is shuttering and it doesn't sound like it's coming from the front
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Old 08-16-2014, 12:47 AM   #6
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Oh. Ok. That's probably some driveline noise mostly caused by the hesitation of the engine.
Your car may just need a good "going over" by someone who is knowledgeable about Mustangs. The Foxes are relatively simple cars.
If there are any Mustang enthusiasts in your area, ask around and they'll be able to recommend someone who can diagnose your car for you and it will be running like new again!
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Old 08-16-2014, 01:15 AM   #7
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Yeah you could be right about that. I do need to find a Mustang person to look at my car but I don't want to pay $100 just for an inspection. I don't have that kind of money
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Old 08-16-2014, 01:30 AM   #8
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Alright. Hopefully we can narrow this problem down a little bit .
Is the Check Engine Light staying lit up all of the time while the engine is running?
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Old 08-16-2014, 01:30 AM   #9
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The check engine light isn't on at all. Never has been
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Old 08-16-2014, 01:33 AM   #10
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It does come on when you turn the key to the on position though right?
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Old 08-16-2014, 01:34 AM   #11
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No the check engine light doesn't come on at all
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Old 08-16-2014, 01:47 AM   #12
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Either the bulb is burned out or someone removed it because it should light up when you turn the key to the on position without the engine running.
No worries. We, hopefully, don't need it.
If you can, go to a parts store, like AutoZone, and see if they can read the codes that are stored in the cars computer. If they cant retrieve the codes, we are going to have to find a way for you to retrieve them. It's the only way that we will be able to diagnose your car over the internet.
It would also help.if you post a clear picture of the engine bay.
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Old 08-16-2014, 03:01 PM   #13
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Okay when I turn it in the on position. The check engine turns on but when I turn her over it shuts off
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Old 08-16-2014, 03:20 PM   #14
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Good!
That's what it's supposed to do.
Are you going to see if the auto parts store can check for any trouble codes?
Also, the reason that I requested a picture of the engine is, there may be something obvious wrong that I or one of the other forum members can spot in a photo, since we can't "physically" look at it.
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Old 08-16-2014, 03:26 PM   #15
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I'm gonna go down to my car right now and take photos of the engine bay
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Old 08-16-2014, 03:30 PM   #16
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Click image for larger version

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Old 08-16-2014, 03:35 PM   #17
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Also I found this while under my hood. Is that supposed to look like that.Click image for larger version

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Old 08-16-2014, 03:58 PM   #18
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If that is the exhaust header and if it is cracked like it looks in the photo... No. It's not supposed to be like that. It looks cracked in one of the other photos as well.
This looks like a nice, unmolested, car.
It also looks like it has the original Idle Air Control valve and probably many of the other sensors are original. The distributor cap hasn't been replaced for some time. The Mass Air Flow sensor probably needs to be cleaned.

What are your thoughts Alysha?
Do you want to try to do some of these repairs yourself?
Is that a crack in the header that we're looking at?
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Old 08-16-2014, 04:05 PM   #19
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Okay so if it is cracked does that mean I need a new engine. Also should I replace those parts that you said never got replaced. Do you think that's what is causing my car to act the way it is

---------- Post added at 09:05 PM ---------- Previous post was at 09:04 PM ----------

What I took a picture of is a pipe that was connected to my engine
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Old 08-16-2014, 04:19 PM   #20
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No. It doesn't mean that it needs a new engine, just a new header, if it is indeed cracked.
How long has it been since your last tune-up? Complete tune-up?
Yes, those things that I mentioned could cause your engine to run bad... Along with a LOT of other things!

The trouble with me recommending for you to replace this part or clean that part is, there could be something simple like a vacuum leak or something that I have no way of finding through the photos, that could be causing your problem also.
We can go through and do most of the tune-up items, which should be done anyway, and if that doesn't solve your problem, you will just have to get it professionally diagnosed by someone who actually has the car in front of them.
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Old 08-17-2014, 02:36 PM   #21
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The vibration and knocking sounds like a bad u-joint. Same thing happen to me. I would check that first. Try to shake the driveshaft to see if there is play in it.

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Old 08-30-2014, 11:40 AM   #22
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Oh yeah and I have a rough idle too. It's rougher when my car first starts but it's a rough idle
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Old 08-30-2014, 10:47 PM   #23
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I'll bet it's your Harmonic Balancer. Been through this recently. Careful driving it if it is. Only $37 on Ebay. Look & see if the rubber ring between the 2 steel rings is coming out, all cracked or even missing little pieces. If it is...Replace it & you should be fine.
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Old 08-31-2014, 01:02 AM   #24
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That wouldn't make it lose power going up hills and getting up to freeway speeds would it
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Old 08-31-2014, 04:35 AM   #25
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Your Harmonic Balancer keeps your crank shaft in balance. Your Rods & Pistons are connected to it. If it's vibrating all over the place you can't get the correct power & I'm not sure ... but I would think it could cause damage to your cylinder walls or possibly ruin your bearings or even throw a rod. It's real easy to check it. If it's pretty bad you can tell just looking at the very bottom pulley on the drivers side while the car is idling in neutral. If it's wobbling & not running smoothly like the other pulleys then it's bad. If it's really bad it will almost sound like a rod knock & if it gets that bad I'd say don't drive it til it's fixed.
Maybe watch a couple U-Tube videos on a motor with a bad Harmonic Balancer to see if it's doing the same thing your car does.
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Old 08-31-2014, 11:41 PM   #26
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Figured out problem. Replaced spark plug wires and replaced fuel filter.
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Old 09-01-2014, 12:03 AM   #27
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Good!
If you keep replacing everything tune up related you'll have that car purring like a kitten...
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Old 09-01-2014, 12:12 AM   #28
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Yeah now I have another issue though with her. I get a slight shuttering when I get to around 50 to 60mph. It isn't very noticeable but I can notice it. What do you think that could be
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Old 09-01-2014, 12:24 AM   #29
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Can you feel it through the steering wheel? Or does it feel like the whole car is shuddering?
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Old 09-01-2014, 12:31 AM   #30
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It feels like it comes from the power train. My boyfriend is wondering if because of how long my car has had the loss of power issue if it is that I either have a dirty cylinder or one of my spark plugs corroded
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Old 09-01-2014, 12:40 AM   #31
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He may be on to something...
I'd definitely do the spark plugs next!
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Old 09-01-2014, 12:43 AM   #32
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I changed the spark plugs like a year ago.
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Old 09-01-2014, 12:50 AM   #33
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Ok.
You should probably replace them again because one or more may have gotten "fouled" due to the bad plug wires.
How old is the cap and rotor?
Have you ever cleaned the Mass Air Flow sensor since you've owned the car?
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Old 09-01-2014, 12:53 AM   #34
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No changed any of that since getting the car two years ago
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Old 09-01-2014, 01:04 AM   #35
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Get a new distributor cap and rotor then.
The MAF sensor is very easy to clean, you just need to be careful to not touch the little wire.
It's located on the air intake right after the air filter. You'll see some wires and a electrical connector.
There is a special aerosol Mass Air Flow sensor cleaner that you can get at any auto parts store.
Also, you may as well replace the Positive Crankcase Ventilation valve while your at it. Again, its very easy to replace and is located on the valve cover of the engine.
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