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Old 08-04-2013, 07:57 PM   #1
strokin6.4
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2002 lx hits bump on highway ABRUPT downshift

02 focus lx 160k on the ticker. Just started today but I believe started running around 30 I hit a hard bump and it threw me forward. But I really noticed on the highway running about 70-75 I hit a bump and she downshifted and revved way up back off throttle and maybe 5 seconds later shifted back up again. About 15 minutes same thing. Then I got on a bridge and hit two bumps back to back and did it twice. I did notice on the bridge when I was trying to throttle through it to see if it would upshift the speedo went crazy like 0-50-0-60 (I was running 60) no codes either. Please help its my DD and I hate driving my 800hp powerstroke 100 miles a day lol. Thank you guys!

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Old 08-04-2013, 08:23 PM   #2
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Bump anyone?

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Old 08-04-2013, 08:51 PM   #3
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It happened to me
2004 Focus Wagon Zetec auto

Found loose battery clamp

CHECK IT! It will not cost a thing and be sure to clean those connections very well.
When done then grab the clamp and see if you cannot twist it sideways, if you can it is still loose.
maybe even redo the ground connection
Does the wire insulation look melted by the battery clamps?, if it does you need new cables

Even if this is not it, cleaning the battery connections is a good thing to do
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Old 08-04-2013, 09:05 PM   #4
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It does have a lot of acid around one of the battery cables but the battery is fairly new. Ill clean it real good and check again. I was thinking maybe a weak connection somewhere so I was checking the harness around the shifter linkage. Never thought of battery though. Any other ideas. The no code thing I'd def throwing me off!

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Old 08-04-2013, 09:23 PM   #5
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Check manual lever position switch adjustment. If tps shorts high it can downshift.
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Old 08-04-2013, 09:35 PM   #6
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Quote:
Originally Posted by rotarypwr View Post
Check manual lever position switch adjustment. If tps shorts high it can downshift.
Anymore explanation? Like how or where its at? How do I check tps?

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Old 08-05-2013, 07:46 AM   #7
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Anybody have anything else? Don't really have any other idea as to what I can check could be wrong

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Old 08-05-2013, 09:04 AM   #8
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Ok so you found corrosion on the battery terminals

clean clean and clean and be sure to neutralize the battery acid on the outside of the battery

So here is a good technical explanation if I am right

When there is an intermittent battery connection a huge spike in voltage occurs that interrupts the electronic control

Please see this link

http://www.troubleshooters.com/dont_...ct_battery.htm


remember after you are all done that try to twist the battery clamps sideways with all your strength if they move they are still too loose


On these early Focus cars there is a cover over the battery I THINK the cover traps the acid fumes

On my 2010 Transit Connect there is no cover and I have had ZERO problems concerning the battery
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Old 08-05-2013, 04:17 PM   #9
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I toss the battery cover more for heat retention melting cables that acid fumes, either way, it seems to help.
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Old 08-05-2013, 05:26 PM   #10
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"""melting cables"""

OH OH If you see melted cables by the battery clamp that means that the crimp went bad

I could be all wrong about the battery thing BUT it is alot simpler to CLEAN the battery clamps etc that to pull the tranny pan and look for intermittents there
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