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Old 04-26-2019, 11:05 PM   #1
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intermittent loping during deceleration

2007 Ford Focus 2.0


Hello,

I have been driving with poor ride quality ever since I bought the focus last year.

I can live with most of the quirks, but what is getting on my nerve is the

loping or jerking back and forth when I left off the accelerator. the loping is

very noticeable in first gear. It comes and goes randomly, but I have noticed it

usually occurs after start-up. My suspicion has been the CV axles, so I performed a

basic check turning them forward and reverse. There is about an inch of play

moving forward and reverse until it catches something that sounds like ball

bearings hitting each other. I have read this is normal so I am doubtful they

are the culprits. I think it has something to do with the drivetrain.

Could worn balljoints/tierods cause this jerking/loping?

I would like to read your thoughts and experiences...


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Old 04-27-2019, 10:04 PM   #2
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Look close at your rear lower trans mount.
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Old 04-28-2019, 12:19 AM   #3
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replacing all three engine mounts was the first replacement i did on the car.

i bought the cheaper alternatives except for the dog bone mount which i thought would be best to get a polyurethane replacement.

i trust that it is holding up. do you suspect engine movement causing this?

Last edited by ant07; 04-28-2019 at 12:21 AM.
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Old 04-28-2019, 04:14 AM   #4
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A bit radical, but removing the hood to drive it a bit without hood would allow you to see how much the engine/trans is moving around.

Wouldn't hurt to do a wheel looseness check at 12 and 6 looking for a bad wheel bearing, one could be locking up then freeing up to do that. Dragging brake (caliper stuck) could as well.

Mounts............'last year'.........'first thing I changed'...........not Ford parts.........could be a pass side mount already bad, in that time, I have seen it more than once in only 3 months.
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Old 04-29-2019, 02:52 PM   #5
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yes, i noticed vertical play on my FL wheel and brake friction on FR wheel when i swapped to my summer wheels. these signs were not present last year though when i switched wheels.

i plan to address these issues soon.

i will pay close attention to engine movement.

is it possible a faulty TB sensor's reading be off and create such symptons? i do find the car accelerates poorly. my scanner showed 16.9% TB position at idle. not sure if that is the default value.

recently, i have installed a new valve cover gasket, a103 spark plugs gapped at 0.054", good C.O.P's from the junkyard, and dorman replacement airbox with k&n filter. cleaned I.A.C and TB as best as i could and reused the gaskets. they seemed ok to be used again.
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Old 04-30-2019, 06:29 AM   #6
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Quote:
Originally Posted by ant07 View Post
cleaned I.A.C and TB as best as i could and reused the gaskets. they seemed ok to be used again.
Get at the very least a new TB gasket. Don't re-use gaskets that affect the air/fuel mixture and how the engine computer calculates it. They're cheap.

Sent from my Moto G (5S) Plus using FF Mobile
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