Question about 1991 Ford Mustang

3 Answers

Ran out of gas and clogged fuel filter and didn't know it so I changed the plugs and wires! That didn't help much so I did a complete compression test on all the cylinders and it checked out at 150 on all 8 so then I adjusted the timing with out knowing what I was doing and at that time I realized I had #2 and #3 wires crossed so I fixed that then ran codes and got code 41 EGO not switching, exhaust lean (bank 1) so I changed the 02 sensor cuz someone told me to and the light went off but still runs EXTREAMLY rough mostly at idle then I changed the fuel filter and it excelerated good but still rough then I learned there is a plug to pull to set the timing at the distbr. So I did that and had it right on the mark... And thought to check it again (yes connecting to the #1 wire on the left front of motor when looking at the motor from the front of the car) and noticed the mark had moved so far down to the left I almost couldn't find it!!! Does that mean it jumped timing? Is that possible with a timing chain? I tried the starter fluid lookin for a vacuum leak but can't get to alot of the vacuum lines that go down in the fender... I also noticed I'm not getting any vacuum from my hose that connects to a diaphragm thing that is right at the throtle body...

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  • woodinstalle Sep 16, 2010

    Is there a way to check the timing chain without taking off the front cover and water pump?

  • woodinstalle Sep 16, 2010

    I was told by a machine shop that rebuilds ford motors that the timing did not jump or it would not run even one tooth so my car runs rough could it be the harmonic ballancer shifted?

  • woodinstalle Sep 17, 2010

    my harmonic balancer has a rubber sleve that slipped I adjusted the timing found TDC on piston number 1 and pushed the flange back on in the right position and it purred like a kitten thank you for all the good advice I'm just so happy my car is going to work when my park comes in!!! thanks

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  • Ford Master
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You do not know what you are doing and causing more problems than enough ,call a local mechanic and ask them to have a look for you ,leave the timing alone till someone who knows what their doing does it for you ,timing cannot SLIP so get professional help because running low on fuel and clogging up a filter is a cows dung reason for your problem ,this is an american home market build vehicle so it differs greatly for this year as to the emmision controls used compared to a europeon model and as such its complicated even for a old vehicle ,get a professional on it

Posted on Sep 17, 2010

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  • Master
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Reset your timing. Hopefully your timing didn't jump which is possible even with a chain. The chain guides can wear or break causing slack in the chain which can allow it to slip. Double check your firing order before doing your timing.
You can go to autozone . com and register for a free account. Then confirm the account, login to the account, choose vehicle year, make, model, engine size, then click on view repair manual which you should find very helpful

Posted on Sep 16, 2010

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  • Master
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Yes. You jumped time. It is very possible with a timing chain. The diaphragm that you are talking about is for cruise control. The timing could have jumped a tooth. If the car has more than 100,000 miles on it, then jumping time is likely to be the problem.

Posted on Sep 16, 2010

  • Rodney Clark
    Rodney Clark Sep 16, 2010

    No. You can crank the distributor around and if it gets better then I am 100% sure that it is the timing chain.

  • Rodney Clark
    Rodney Clark Sep 17, 2010

    That is great. I was sure it was something to do with the timing. Good job!

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1 Answer

2004. Why does it slow down at wot?


Good evening Kevin.
A happy engine needs:
  • Air
  • Fuel
  • Spark
  • Compression
  • Lubrication
Your describing the vehicle running great for a couple of hours with a new fuel pump does make the fuel system a bit suspicious. Along with the fuel pump, you should consider changing the fuel filter if you have not already done so. Swapping the fuel pump likely shook up the fuel lines and may have loosened some blockage or debris, which may then have flowed back into the most open spots in the lines and clogged them back up as you kept running.

Clogged or damaged fuel injectors could also be part of this. You can dump in a bottle of fuel injector cleaner, though mechanics will have access to stuff that is way more powerful for clearing injectors if that's the problem.

If you got a bad batch of gas, that won't help either, and can deliver variable results, especially if, say, there's water blobbing around on the bottom of the tank (heavier than gas, may spread when vehicle is moving.) Dumping in a bottle of octane boost to see if it makes a difference may help diagnose if that's part of the problem.

Take a look as well at your air filter - if it's dirty or clogged, that can be starving the engine for air, especially when revving the engine.

Compression would be at tough one, other than just putting a compression gauge on and checking it. 'No compression' results are usually either simple, like 'the spark plug isn't tightened down' or really not simple, like end-of-life on piston rings or valves.

Hopefully you've changed your oil and filter in recent memory and made sure there's enough oil in the engine.

Those are my first thoughts on things to consider that won't involve too much time.

Good Luck!
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