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1979-2004 V6 Mustang Tech Discussions

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Unread 02-20-2010   #1 (permalink)
OneManGenocide is offline Rookie


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Default 1998 3.8 Mustang Camshaft Sensor Problems

Okay I have a Problem with my 1998 Mustang i just bought, and i was wondering if anyone else has ever had the same issues. My check engine light was on and my car slowly started to run poorly. When i idle it would sputter and run hard. Plus around 35-50 mph it would jerk when i accelerated, and i now get horrible gas mileage, around 175 miles on a full tank when i used to get 300 or so. So I got a friend at the firestone down the street to run a diagnostic, and came back as the camshaft position sensor and misfiring cylinder 5. I bought a replacement sensor from auto zone and installed it myself. When I drove about 3-4 miles and it started again, and I could also smell like a electrical burning smell. So i took the sensor back and got a replacement, but the same thing happened again. Im thinking something is shorting out the sensor. Also, could the accelerating problem be my transmission? I hope some one can help me with this until i have the money to go back to the mechanic. Thanks for your time.
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Unread 02-20-2010   #2 (permalink)
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There are 2 types of cam sensors and ford has a tool to get them in time. I was told the engine will run fine if they are out a little but it will cause the check engine light to come on. You say you have a misfire on number 5 cyl? Sounds like your poor running problem is there not the cam sensor. You either have a bad plug, bad plug wire, or coil pack. If you have more than one cyl misfireing it could give you a cam sensor code. Also the smell you have may be unburned fuel.
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Unread 02-20-2010   #3 (permalink)
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or a injector problem,,almost forgot that,,my bad
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Unread 02-20-2010   #4 (permalink)
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true that. my problems weren't as bad as urs. maybe if i would have let my car run awhile like it was it would have. but my coil pack was bad causing my rpms to short out. or when i gunned it, it would take a couple secs to react which pissed me off! haha. well good luck!
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Unread 02-21-2010   #5 (permalink)
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My cam position sensor has been replaced twice, but neither time it failed did the engine run all that bad. Once the light is on, I think the "limp-home" mode kicks in. Each time I replaced the unit (top module only, so no adjustment is necessary) it fixed the problem.
No burning electrical smell...

I know that doesn't help you with your problem, but I wanted to let you know what my experiences have been.
Good luck.

Paul
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Unread 02-21-2010   #6 (permalink)
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Did you check the plug wires after you replaced everything to make sure one of them is not laying on a header tube?
It might not be that likely, but since you have to remove the coil pack to get to the sensor, I thought I'd bring that up.

Paul
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Unread 02-21-2010   #7 (permalink)
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Hey it sounds like you're having the same problem that i had a few weeks ago with my 01 v6. My car let out a very loud whine before it hesitated or jerked me hard. It might be the camshaft synchronizer. When I had the problem I ran the trouble code check with my tuner and it read [P0340 camshaft postion sensor A circuit (bank 1 or single sensor)]. I replaced the sensor by itself but it turned out that i needed to replace the camshaft synchronizer with the sensor as well. I don't know why it says one of your cylinders is misfiring but it might have to do something with the synchronizer. Try asking your mechanic about that. Also if you have more questions go to my page and check out the thread I have about the "whining noise"
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Unread 02-24-2010   #8 (permalink)
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Thank you all for you input. I decided to go buy a manual and try to install the synchronizer myself because every auto shop i called wanted to charge me 400-600 dollars to just install the part. Took me forever to find out how to get to TDC(top dead center) but once I did it was an pretty easy job. It runs A LOT better now, but there is still the jerk between 35-50. I guess its not camshaft related, so i'm gonna get it a tune up and the transmission flushed and let you know if it fixes the problem. Thanks again for the help!
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Unread 02-24-2010   #9 (permalink)
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Quote:
Originally Posted by OneManGenocide View Post
Thank you all for you input. I decided to go buy a manual and try to install the synchronizer myself because every auto shop i called wanted to charge me 400-600 dollars to just install the part. Took me forever to find out how to get to TDC(top dead center) but once I did it was an pretty easy job. It runs A LOT better now, but there is still the jerk between 35-50. I guess its not camshaft related, so i'm gonna get it a tune up and the transmission flushed and let you know if it fixes the problem. Thanks again for the help!
Uh, you know that there is a write-up on the top of the tech page, don't you? You can just send me $100.00 for the info if you want.....
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1998 mustaang, camshaft position sensor, cylinder misfire, hesitation issues



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