Truck's running "bumpy"

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Jul 16, 2010 | 10:13 PM

RAH4X4

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From: Robbinsdale

Truck's running "bumpy"

I just bought a 95 F150 4x4 with the 302. Not sure what the deal is. When I have my foot on the gas it feels like the whole truck shudders and every once in a while it randomly feels like I'm hitting a bump in the road or tapping the breaks real hard. It's hard to explain. Just wondering if anybody else has had this problem. It stops shuddering when I take my foot off the gas pedal. It seems to lose power going up any kind of an incline on the highway too. I have to floor it in order to stop decelerating. There's no check engine light iluminated so I'm thinking it's not engine related. U-joints? Tranny? I notice it a lot more on the highway rather than residential roads.

Last edited by RAH4X4; Jul 17, 2010 at 04:53 PM. Reason: I had said brake but I meant gas pedal

Jul 17, 2010 | 03:04 PM

RAH4X4

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From: Robbinsdale

any ideas?

Jul 17, 2010 | 04:35 PM

phoneman91

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From: Aurora,Colorado

Is this truck equipped with an automatic transmission?? If so-does this occur when the truck is in first and second gear?

Jul 17, 2010 | 04:52 PM

RAH4X4

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From: Robbinsdale

it is an automatic. I haven't noticed it doing it in first and second. It's mostly on the highway that I notice it. so it's in overdrive. It has 144k miles.

Jul 18, 2010 | 03:00 AM

phoneman91

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From: Aurora,Colorado

I wonder if it is caused by the lock up feature of the torque converter. Try taking it out of overdrive on the highway and see if it does it.

Check for DTCs/Diagnostic Trouble Codes in the computer .

Jul 18, 2010 | 01:51 PM

RAH4X4

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From: Robbinsdale

i'll check it out and get back to you. thanks

Jul 18, 2010 | 01:56 PM

phoneman91

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From: Aurora,Colorado

These trucks have lock up torque converters. And if your converter is locking and unlocking-it should stay locked on the highway at constant speed-it could cause the problem you have described. And I believe that the converters should lock only at steady speed/load on the highway-and only in third and fourth gear.

If the truck is underload-it could be shifting from overdrive to direct constantly at a given speed. Especially when driving into the wind and when going up hills.If so-try driving in third/direct and see if this trouble still occurs.