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Car Forum / Ford / Ford Mustang / August 2005'97 4.6 weird shudder
Hi all, I have a 97 GT 4.6 and I've been having this strange problem. Between 1500 and 2000 rpm's I get this strange shudder which feels exactly like it would when going over rumble strips in the road. I know it's not road noise 'cause when it has happened the road has been flat and smooth, it feels like engine vibrations to me. It always happens when I'm on the gas at about 1800 rpm's. Anyone else ever had this and what do I do to correct it? Thanx- Trotzo >Hi all, >I have a 97 GT 4.6 and I've been having this strange problem. Between [quoted text clipped - 6 lines] >Thanx- >Trotzo I'm no mechanic, but I'd start looking for something loose that starts vibrating at a certain rpm. Have you checked it when you're not moving? Have someone get in and run it up while you're looking around and feeling for something loose.  SignatureJohn H. On the 'PocoLoco' out of Deale, MD > Hi all, > I have a 97 GT 4.6 and I've been having this strange problem. Between [quoted text clipped - 6 lines] > Thanx- > Trotzo AT or MT? Speedo reading? Or at any speed? > > Hi all, > > I have a 97 GT 4.6 and I've been having this strange problem. Between [quoted text clipped - 10 lines] > > Speedo reading? Or at any speed? AT and it seems to do it under light accel, at about 35 mph and above. It's also an intermittant problem, I tried to "make" it do it but it does it when it wants to. Since my last post, I discovered that it comes from under the car, not under the hood. I'm thinking transmission? Thanx again.... > AT and it seems to do it under light accel, at about 35 mph and above. > It's also an intermittant problem, I tried to "make" it do it but it > does it when it wants to. Since my last post, I discovered that it > comes from under the car, not under the hood. I'm thinking > transmission? > Thanx again.... Now try it in the D position (or OD off), OD not trying to shift. That is a symptom of Torque Converter lockup problem How many miles on the car, when was trans last serviced? Watch the tach... any noticable slippage? > > AT and it seems to do it under light accel, at about 35 mph and above. > > It's also an intermittant problem, I tried to "make" it do it but it [quoted text clipped - 9 lines] > > Watch the tach... any noticable slippage? I noticed it does it right around the 30 mph range (18-20,000 on the tach), under slight accel, especially when going up an incline. Seems like it does it just before the tranny tries to shift to a lower gear, like when the motor starts to lug. Sounds exactly like going over rumble strips. 49,000 miles on it, just bought it from a lot so I don't know when it was last serviced. thanx again for the replies... >>>AT and it seems to do it under light accel, at about 35 mph and above. >>>It's also an intermittant problem, I tried to "make" it do it but it [quoted text clipped - 17 lines] > know when it was last serviced. > thanx again for the replies... Sounds like what Backyard said. I have driven a couple of vehicles where this has happened, have had the tranny serviced and things have smoothed out for awhile. I'm also with Backyard. Classic torque converter shutter. Look up TSB 98-8-7. The fix may be inexpensive but read the TSB before taking it to a shop as they may have other designs. SignatureRichard '94 GT 'vert Under Drive Pulleys Transgo HD2 Reprogramming Kit High Stall Torque Converter 4:10 Gears Gripp Sub Frame Connectors (welded) FRPP Aluminum Drive shaft FRPP M5400-A Suspension Laser Red > > > AT and it seems to do it under light accel, at about 35 mph and above. > > > It's also an intermittant problem, I tried to "make" it do it but it [quoted text clipped - 17 lines] > know when it was last serviced. > thanx again for the replies... its the classic famous ford AODE shudder on tq lockup. try a bottle of lubegard red. if prob persists call lentech trans to have the prob solved > Hi all, > I have a 97 GT 4.6 and I've been having this strange problem. Between [quoted text clipped - 6 lines] > Thanx- > Trotzo |
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