Truck Is Hesitating

[bpkingcobra]

98 Ford F-150, 4.6 engine. I'm experiencing what i can only describe as hesitating issues when i accelerate while i'm parked or while driving. At times it seems like it wants to choke when i make right turns. I went to Autozone and got an error of P0300 which is random mis-fire. I have changed my spark plugs about two years ago and changed out the boots about 8 months ago. I also changed out the fuel filter around the same time i changed the spark plugs. I used to have this problem before 8 months ago when i got a P0307 message and was experiencing the same issues; which is why i changed out the boots. I wasn't having a problem until just recently. I'm not sure what to do or check at this point. Any suggestions?

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[torkum]

Take your coil paks off and have them checked at AutoZone.

[bxstang2000]

How many miles do you have on your truck? Have you every replace your O2 sensors?

[brian2k]

Originally Posted by bxstang2000

How many miles do you have on your truck? Have you every replace your O2 sensors?

Yea I would def have a mechanic check your O2 Sens. That's probably where your problem is going to be!

[bpkingcobra]

I have only 94k miles on it. I'll have the O2 sensors checked then. Thanks.

[morris150]

Originally Posted by brian2k

Yea I would def have a mechanic check your O2 Sens. That's probably where your problem is going to be!

ok i have a question for you... i know I am a newbie .. but what would the 02 sensor have anything to do with the trany ???...

Morris

[bxstang2000]

Originally Posted by morris150

ok i have a question for you... i know I am a newbie .. but what would the 02 sensor have anything to do with the trany ???...

Morris

Doesn’t sound like a transmission problem. He said it hesitates while driving or parked so it sounds more engine related. If it was slipping I would say transmission. O2 sensors send the computer a voltage reading depending if the exhaust gasses are rich or lean in closed loop. Then the computer determines how much fuel to add or subtract. If the o2 sensor is worn and weak it might send a slow signal which could cause hesitation, poor fuel economy, and higher emissions. A worn O2 sensor wont always throw a code so you need to monitor the o2 sensor voltage to see how its performing.

Hope this helps
John

[morris150]

Originally Posted by bxstang2000

Doesn’t sound like a transmission problem. He said it hesitates while driving or parked so it sounds more engine related. If it was slipping I would say transmission. O2 sensors send the computer a voltage reading depending if the exhaust gasses are rich or lean in closed loop. Then the computer determines how much fuel to add or subtract. If the o2 sensor is worn and weak it might send a slow signal which could cause hesitation, poor fuel economy, and higher emissions. A worn O2 sensor wont always throw a code so you need to monitor the o2 sensor voltage to see how its performing.

Hope this helps
John

ok got ya... sorry miss read that one... when I put my truck into drive it is
hesitates for a few sec before popping into drive.. going down the road runs great.. ok i do have a misfire (cops and plugs on the way).. but nothing from the trany.. I am going to change the oil and filter this weekend I am hopping that puts a stop to it..

Thanks
Morris