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Old 08-01-2014, 11:31 PM   #1
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2003 mustang gt

Can someone help my car has a real bad gas smell and dark color smoke out the exhaust it was pulling a camshaft sensor code and cylinder 2 misfire I replaced the plugs and coil packs and the cam shaft sensor the car runs much better but it has a back fire threw the exhaust when I go to start it then I try to start again and it runs fine you can just smell the gas I'm confused and out of idea what it could be


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Old 08-01-2014, 11:52 PM   #2
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So no more codes?

I'd do a fuel pressure test and see what the pressure is.
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Old 08-01-2014, 11:56 PM   #3
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It keeps pulling up the cam sensor code I replaced it twice thinking I could have bought a bad one and I replaced the crank position sensor still got a bad gas smell out the exhaust and and a back fire when I first go to start it


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Old 08-02-2014, 12:03 AM   #4
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The cam sensor is the likely problem then. I think that you need to do something else when you replace it.
Did you disconnect the battery for 15 minutes so that the computer will reset and learn the parameters of the new sensor?
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Old 08-02-2014, 12:05 AM   #5
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No I didn't that might help I'll try that tmro then if not idk


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Old 08-02-2014, 12:09 AM   #6
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You need to do that everytime that you replace an electronic component on the engine. And you should do it BEFORE unplugging any wires.

Let us know if it works...
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Old 08-02-2014, 12:14 AM   #7
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Would this work on mine never heard of someone doing it this way


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Old 08-02-2014, 12:21 AM   #8
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All you need to do is just disconnect the negative side of the battery for about 15 minutes, just long enough for the Keep Alive Memory (KAM) to run out of battery power and it will clear itself.
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Old 08-02-2014, 08:06 AM   #9
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I will bet money your alternator is going bad. I had the exact same problem. Same code and same exhaust pop on startup. You can google it. For what ever reason there is a diode or what ever in the alternator that goes bad. I replaced the alternator and it fixed the problem.


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Old 08-02-2014, 08:24 AM   #10
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I will bet money your alternator is going bad. I had the exact same problem. Same code and same exhaust pop on startup. You can google it. For what ever reason there is a diode or what ever in the alternator that goes bad. I replaced the alternator and it fixed the problem.


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+11. Except for me I only has the code pop up!.. Replaced the alternator and that fixed everything!..


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Old 08-02-2014, 09:54 AM   #11
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Same here. Had the code and car would miss a little. Replaced the alternator and it fixed the problem.
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Old 08-02-2014, 12:19 PM   #12
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Really a alternator can cause that that's a new one to me then last thing I would have changed


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Old 08-02-2014, 02:43 PM   #13
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My car didn't throw any codes when my alternator went out.

Take it to an auto parts store and have them check the charging system.

Did you try the battery disconnect procedure yet?
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Old 08-02-2014, 05:39 PM   #14
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Really a alternator can cause that that's a new one to me then last thing I would have changed


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The defective alternator is generating EMI which interferes with the CPS. The CPS is basically an electromagnet which picks up the teeth on the disk and generates a pulse back to the computer. It's very sensitive to EMI.

Have your alternator checked out at Autozone or similar before replacing. it as there are other causes and alternators aren't cheap.

It's a weak or defective diode that causes it. Sometimes you might also hear a whine in the radio that changes pitch when you rev the car.
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Old 08-02-2014, 05:53 PM   #15
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Ok I did take it to advance to have it checked out it was bad I replaced it the car don't die anymore when I first go to start it it it fixed that and I reset the computer for 15 min then plugged it back up wile i changed it. But the car still got that gas smell and gray smoke coming from the pipes when it's running and a slight miss to it but it runs drives great now just the smoke


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Old 08-02-2014, 05:57 PM   #16
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Oh btw the car don't have the cats on it it's had straight pipe put threw them and the black flow masters would that make it run rich like that it has k&n cold air other that that it's stock


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Old 08-02-2014, 07:22 PM   #17
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It's pulling a p0420 p0430 would that make it miss and over fuel


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Old 08-02-2014, 07:30 PM   #18
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No. Those codes are just reporting that the catalytic converters aren't functioning.

I guess just drive it for a while and see if another code will show up and lead to you to the problem.
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Old 08-03-2014, 10:43 AM   #19
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Gas smell could be from running rich due to having no cats. If I am correct when you go catless you'll want to get at least the rear o2s tuned out else you'll always be in open loop, which is a rich condition

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Old 08-03-2014, 10:54 AM   #20
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Ok thanks I'll try that then


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Old 08-03-2014, 04:14 PM   #21
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For the gas smell check the hose berween your fuel rails! I just had that problem 2 weeks ago it was really strong inside the car and the hose was cracked under the clamp on both ends
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Old 08-05-2014, 09:02 AM   #22
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Took the car and had it hooked up to a computer everything checks out fine said don't know why it smokes when it's warm could be because it don't have cats on it


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