i have a problem with my 99 and i am 2 hours from an svt dealer. anywhere from 27-49 mph my truck has what i describe a bump bump in it. sometimes you can feel it and you can always here it. took it to my local dealer but there computer is not SVT Lightning compatible they checked trans. nuthin wrong with it. he thinks it could be something to do with the supercharger. but this place is stupid anyways has anyone had this problem before if so what was it so i can get this fixed soon. i am going to have to drive a ways to an svt dealer and would like to be able to tell them something it could be. help me.

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Rusty McLain 99 Red Lightning w/ cd changer and towing package,superchip,and PSP Filter and a red 94' lightning.
99' 1/8 mile 8.76 @ 81.6mph

 

just got off the phone with the svt dealer in savannah. he said it may take 2 days so this would probably shorten it if someone has had this problem. my appointment is friday at 9:00 so ill give you til then. thanks

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Rusty McLain 99 Red Lightning w/ cd changer and towing package,superchip,and PSP Filter and a red 94' lightning.
99' 1/8 mile 8.76 @ 81.6mph

 

I had something like that. My problem was more of a slight hesitation. It only did it once and a while. It went away or I dont notice it any more. Scott

 

Hmmm..

I think I know what you are talking about.. my 99 bucks a little bit when driving on the highway, but I have a feeling it has to do with the locking and un-locking of the torque converter.. I do not know what speed the converter locks at but.. it may coincide with the bucking you feel.. If you are cruising and you hit the brake pedal the converter unlocks.. this may be what you feel..

Just a thought..



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Got Boost ?
1999 SVT Lightning

 

I did notice my bucking when the overdrive button was out. You could be right with the converter lockup. Scott

 

i thought it was the converter too but my local dealer said that wasnt it.but they are real idiots.

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Rusty McLain 99 Red Lightning w/ cd changer and towing package,superchip,and PSP Filter and a red 94' lightning.
99' 1/8 mile 8.76 @ 81.6mph

 

I have felt what I would describe as a "Bumpy Road" feeling @ 35mph. Could not get the damn thing to do it 2 dif. times @ dealership I only felt it a few times and when do I drive 35 anyway

 

thats exactly it bumpy road feel. mine is anywhere from 30 to bout 47 or so

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Rusty McLain 99 Red Lightning w/ cd changer and towing package,superchip,and PSP Filter and a red 94' lightning.
99' 1/8 mile 8.76 @ 81.6mph

 

I hope this isn't the problem but Ford has a history of problems with the A4OD and the torque converters.

I had a '97 T-Bird that would feel like you were running over rumble strips on a perfectly smooth road. After a little research I discovered a service advisory that details the problem. It seems the trans fluid they used on the A4OD would deteriorate over time and cause the torque converter to spontaniously lock and unlock. The solution was a change of fluid types after a complete system flush. The older fluid would varnish up the torque converter causing the slippage.

I was told the problem was solved in mid 98. It affected the T-Bird and Crown Vic. I never saw any mention of the F-150 having this problem but then again, few of them are subject to the abuse we put ours through.

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Mark Whatman
mwhatman@worldnet.att.net

• 99.5 White Lightning (PSP Filter & Chip)
• 99 Buell S3 Thunderbolt (not stock!)
• 98 F-150 Lariat (Flowmaster)
• 96 26' Velocity Offshore Race Boat (far from stock!!!)

 

Rusty,

One additional thing to rule out: Try running your Superchip in the "stock" position for awhile and see if that makes a difference. Sometimes the chip (regardless of brand) can induce a "bump" at lower speeds.


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Mike Philpott
Orlando, FL
'99.5 Black Lightning
SVT #2190 - Build Date 6/9/99
NLOC #361
6 CD Changer, Class 3 Hitch, A.R.E. LSII Lid, BedRug Liner, Invinca-Shield/3M Scotchcal protective film, Wyldman's Clear Lexan Fog Light Covers, 16% Window Tint, LoJack, Val-1, Sal's PSP Chip & Air Filter Kit

 

Rusty:

I know we are all sort of hunting here, but I run/have run both chips. As soon as we got the winter gas formula in Ga., I noticed what I call surging at that speed in OD mode with the Superchip. I eventually had to switch to normal mode on the chip.
Got the PSP chip, and as soon as it got pretty well into it's learning curve with the computer, it started the same thing. I now run that chip in normal as well.

I hope Mike or Sal read this thread to offer input. Doesn't seem to hurt anything, but it is annoying. PS, the main reason I switched off both chips was detonation with winter gas. The surging was just another annoyance.
Bill

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Bill Murray
99 Lightning #247
PSP Chip & Filter
Spare Superchip
Bassani full system TBI
Oxford White w/normal options.
98 Lincoln Continental Stock
56 F100 Big Window 272 w/TBird intake headers Fordomatic
56 F100 small window w/built 300" I6
69 Belair 390/427/400 Built
69 C10 Panel Stock
Soon: 92 Town Car
Tamiya 1/10 Lightning
Lightning & Thunder Rag Doll Cats.
E-mail MOSTOYSINC@AOL.com
htuken@BellSouth.net
HobbyTown1@WebTV.net
Kennesaw (Atlanta) Ga.

 

The problem the Crown Vics had was a faulty torque converter, changing the fluid was only a temp fix. Ford has fixed the converter problem.