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Old 08-02-2016, 02:10 PM   #1
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Multiple issues my car is having

Car is an 03 mach 1... first im running the factory catback but dumped before the axle because a catback i bought didnt fit right before i went to mw so i had to throw the factory mufflers back on and the car is now hesitating at wot and second the check fuel cap light is on and ever since it's been on the smell of gas has increased but the car is running a little better. Just wondering if it's bad to be driving it with those issues and how can I fix them?
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Old 08-02-2016, 02:32 PM   #2
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First, the smell of gas is always bad. If your gas cap seems okay, you have to get under the car and inspect for damage to the fuel lines. Doing exhaust work might have accidentally damaged a hose or fitting while under there. It happens.
I realize some people live in an apartment complex and you aren't allowed to do car maintenance. One way or another, you need to get under there and inspect for leaks.
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Old 08-02-2016, 04:02 PM   #3
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First, the smell of gas is always bad. If your gas cap seems okay, you have to get under the car and inspect for damage to the fuel lines. Doing exhaust work might have accidentally damaged a hose or fitting while under there. It happens.
I realize some people live in an apartment complex and you aren't allowed to do car maintenance. One way or another, you need to get under there and inspect for leaks.
Okay thanks


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Old 08-02-2016, 04:06 PM   #4
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Does anybody know if running an open midpipe temporary will hurt the car or not?

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Old 08-02-2016, 04:29 PM   #5
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Just load as **** should be OK might run like crap

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Old 08-02-2016, 06:15 PM   #6
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Mine has been like that the last couple days no problems. Not as loud as open headers but a little loud.

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Old 08-02-2016, 06:49 PM   #7
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Does anybody know if running an open midpipe temporary will hurt the car or not?

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There are a few guys around me running open pipes, no mufflers after the cats. You should be fine that way.

The cars I have heard sound horrible, but that is my personal opinion.

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Old 08-02-2016, 08:11 PM   #8
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I have an off road x

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Old 08-02-2016, 08:27 PM   #9
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I have an off road x

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It would be loud, and possibly raspy.

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Old 08-02-2016, 08:39 PM   #10
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It would be loud, and possibly raspy.

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Ik how loud it is I'm just wondering since it's not tuned will it be hurting the car
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Old 08-02-2016, 08:48 PM   #11
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Ik how loud it is I'm just wondering since it's not tuned will it be hurting the car
The factory tunes tend to run a bit on the rich side, so the engine should be fine running with no mufflers.
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Old 08-02-2016, 10:50 PM   #12
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The factory tunes tend to run a bit on the rich side, so the engine should be fine running with no mufflers.
Yeah but now I believe it's getting fuel cuts also the car has an off road x so there won't be cats to keep the back pressure there
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Old 08-02-2016, 10:58 PM   #13
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Yeah but now I believe it's getting fuel cuts also the car has an off road x so there won't be cats to keep the back pressure there
A lack of back pressure isn't gonna hurt the car. You'll be fine to run just the midpipe.

As far as fuel cut, it sounds totally unrelated to what you've listed already. Stick a fuel pressure gauge on it and monitor the pressure as you drive it.
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Old 08-02-2016, 11:13 PM   #14
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Yeah but now I believe it's getting fuel cuts also the car has an off road x so there won't be cats to keep the back pressure there
The X pipe will scavage the exhaust pulses just fine and balance things out. No back pressure required.

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Old 08-02-2016, 11:17 PM   #15
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Backpressure is a myth. Your engine doesn't need it to run properly. It does, however, need a properly sized exhaust system to promote a scavenging effect on the exhaust.

Your engine will run better, and sound better with a complete exhaust system. But I see no problem with running the car without the mufflers and tailpipes. With the exception of blasting the underside of the car with hot, loud, exhaust, of course.
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Old 08-02-2016, 11:24 PM   #16
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Backpressure is a myth. Your engine doesn't need it to run properly. It does, however, need a properly sized exhaust system to promote a scavenging effect on the exhaust.

Your engine will run better, and sound better with a complete exhaust system. But I see no problem with running the car without the mufflers and tailpipes. With the exception of blasting the underside of the car with hot, loud, exhaust, of course.
Exactly. Thank you for the clarification Stray.

You will have to forgive my lack of termonology. Due to an infection in my jaw (broken wisdom tooth that caused complications) I am in the comfort of oxycodone. I get to go back again tomorrow for more abuse.

The Oxy and I do not like one another. I prefer a sober mind. My head is nowhere near clear at the moment. Oddly I am not tired. For some reason I am full of energy, but I have no coordination. Drugs are not my friend.

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Old 08-03-2016, 12:19 AM   #17
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Exactly. Thank you for the clarification Stray.

You will have to forgive my lack of termonology. Due to an infection in my jaw (broken wisdom tooth that caused complications) I am in the comfort of oxycodone. I get to go back again tomorrow for more abuse.

The Oxy and I do not like one another. I prefer a sober mind. My head is nowhere near clear at the moment. Oddly I am not tired. For some reason I am full of energy, but I have no coordination. Drugs are not my friend.

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I hope that you get better soon Revvv.
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Old 08-03-2016, 12:27 AM   #18
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I hope that you get better soon Revvv.
Thank you. After tomorrow it's just healing and more pain meds if everything goes as planned.

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Old 08-03-2016, 10:45 AM   #19
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A lack of back pressure isn't gonna hurt the car. You'll be fine to run just the midpipe.

As far as fuel cut, it sounds totally unrelated to what you've listed already. Stick a fuel pressure gauge on it and monitor the pressure as you drive it.
Reason why I think it's related is because it's only been doing it since I did the modification to the exhaust. The car ran the best with the stock h and catback and ever since I put the off road x on it the car had a very very tiny hesitation but now it's really major that even the passengers and people listening outside the car can here it.
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Old 08-03-2016, 11:36 AM   #20
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The X pipe could be causing things to run lean for some reason. You could also need new plugs, fuel filter, etc. If you think the exhaust caused the problem, swap it back out and see whether or not it clears up.

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Old 08-03-2016, 12:27 PM   #21
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The X pipe could be causing things to run lean for some reason. You could also need new plugs, fuel filter, etc. If you think the exhaust caused the problem, swap it back out and see whether or not it clears up.

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Yeah I've swapped out the plugs,fuel filter, changed the oil and oil filter after I swapped midpipe and It made the car run noticable better but still had issues.
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Old 08-03-2016, 03:30 PM   #22
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Are you tuned for the x pipe and does it have all the cats?

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Old 08-03-2016, 05:00 PM   #23
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You do not have to have a tune on 94 - 04 Mustangs when you change your exhaust.
I've owned a 94, 96, 98, 02 & 04 & have put X-Pipes on all of them. 2 - I put Headers
on also. You said you still have your cats on...right? I'd tap on them with a rubber mallet to see if they might have clogged when you changed your exhaust. That will cause hesitation. The gas cap I'd change right away. Remember...you have to drive the car about 50 miles before the computer resets itself. Your Cap could be your problem. Probably where your smell is coming from. If not check the Rubber Gasket around the filler neck where it meets the tank. They are notorious for dry rot, smell & eventually leaks. The other thing it could be is one of your sensors is dirty. MAF Sensor would most likely be the one if it were a sensor. Just a few starting points to find your problem. Hope it helps.
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Old 08-03-2016, 09:11 PM   #24
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You do not have to have a tune on 94 - 04 Mustangs when you change your exhaust.
I've owned a 94, 96, 98, 02 & 04 & have put X-Pipes on all of them. 2 - I put Headers
on also. You said you still have your cats on...right? I'd tap on them with a rubber mallet to see if they might have clogged when you changed your exhaust. That will cause hesitation. The gas cap I'd change right away. Remember...you have to drive the car about 50 miles before the computer resets itself. Your Cap could be your problem. Probably where your smell is coming from. If not check the Rubber Gasket around the filler neck where it meets the tank. They are notorious for dry rot, smell & eventually leaks. The other thing it could be is one of your sensors is dirty. MAF Sensor would most likely be the one if it were a sensor. Just a few starting points to find your problem. Hope it helps.
It's an off road x and I haven't looked into the gas cap
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Old 08-03-2016, 09:29 PM   #25
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Ya. My fuel neck grommet on my car rotted in half about 7 years ago and poured half a tank of gas out when it showed me it was dead!

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Old 08-07-2016, 03:15 PM   #26
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I bought a new cap and I cleared the light but I still have a slight smell of gasoline.

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Old 08-07-2016, 03:24 PM   #27
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I would definitely be checking the fuel neck grommet.

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Old 08-07-2016, 05:15 PM   #28
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I would definitely be checking the fuel neck grommet.

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Where is that located?
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Old 08-07-2016, 06:15 PM   #29
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It's on the fuel tank passenger side. Just follow from the gas cap down through the trunk to the tank.

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Old 08-10-2016, 10:25 AM   #30
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Found this today on my intake, I'm guessing this can be a reason my car is running like trash
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Old 08-10-2016, 10:29 AM   #31
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That will definitely cause a vacuum leak.
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Old 08-10-2016, 12:25 PM   #32
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That will definitely cause a vacuum leak.
I put gorilla tape over it and ran it down the street. The cars hesitation issue went from being really bad to not much if any at all
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Old 08-10-2016, 12:49 PM   #33
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at least ya used the good tape.
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Old 08-10-2016, 01:01 PM   #34
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I wonder if a new OEM air intake is available for the Mach 1?
It took me about a year to find a good used one for my Bullitt.
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Old 08-10-2016, 06:27 PM   #35
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Well my buddy hooked me up with a Jlt ram intake for $50 so that and my borla catback I'm throwing on tomorrow should fix everything

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