Severe shudder !
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Freshman User
Joined: Apr 2014
Posts: 38
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Severe shudder !
Hey guys . For the past few weeks my truck has had a light stumble on acceleration and been a bit sluggish . I checked for crossfire but didn't see anything until I looked through the fender wells where the plugs go into the heads I can see the ceramic lighting up . I replaced plugs and wires and it still doing it . Last night while cruising down the highway the truck started bucking and shaking violently and pulled over but nothing seemed wrong with the suspension . I drove it the rest of the way home without it happening . There is no codes coming up . I'm going to replace the coil tonight and maybe the fpr . Could this problem be torque converter related ? The tranny was rebuilt 40 k ago
New User
Joined: Apr 2015
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Shudder Fixed -came from bad gas cap, not bad coil
I bought my '99 f150 with 110K on it a few months ago. It shuddered after heated up at highway speed when I would brake and slow way down for an exit or turn, and then try to resume speed, I'd get that rumble strip shudder for a while. No codes came up. My mechanic thought it might be the transmission, after a transmission service, the tranny guy said it seemed like misfiring/ probably bad coil. It came especially around 1500 rpm.
I had not liked the way the gas cap seemed to fit & could see it was not original. For $12 on eBay, I got a FORD cap specified for the '99 f150.
Two tanks of gas later--500 miles--and no more shudder.
I had not liked the way the gas cap seemed to fit & could see it was not original. For $12 on eBay, I got a FORD cap specified for the '99 f150.
Two tanks of gas later--500 miles--and no more shudder.
Senior User
Joined: Mar 2015
Posts: 249
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From: Penndel, PA
Does sounds like a real nasty miss. Start with your basics as you described, coil, dizzy cap etc. Run the engine in the dark with the hood open and see if anything is arching under the hook. Could be as simple as a burnt up wire somewhere that you're not seeing in the daylight.
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