Hi guys.

I have an unusual problem with my TP magna. The car is vibrating/shuddering between 35-45 kph only. Has me and the mechanics baffled. Anyone have any ideas? Info much appreciated. Thanks

other than u'r usual "tyre balance, wheel allignment" comments is it auto or manual as it may be having trouble gripping to 2nd if its auto

hi,

im gonna take a stab in the dark and say it could possibly be your spark plug leads. How long since the ones on there have been changed?
The speed you are doing is not relevant, im thinking more along the lines of the RPM's of the motor and how much load the motor is on. so i guess a way to test this is to find a big hill, drive up it at a similar RPM to what your car is doing when yur going 35-45, but in a different gear, and give it a bootfull of accelarator.

my dads commodore had a similar problem, whereby it was shuddering under load in 1st gear, but any other gear and any other revs and it was fine, changed the spark plug leads and the problem went away.

hard to say without seeing / driving the car, not sure of what kind of shudder/vibration it is, the fact your mechanic cant find it means its not something obvious, that or its time for a new mechanic.

Hi guys.

I have an unusual problem with my TP magna. The car is vibrating/shuddering between 35-45 kph only. Has me and the mechanics baffled. Anyone have any ideas? Info much appreciated. Thanks
I don't think this may be the problem, but my old sigma had a weird vibration problem. Turned out the bolts holding the wheel hub to strut were loose! Worth a look when all the usual suspects have been checked. Someone who knows more than me will have a few better suggestions. Good luck!

Thanks guys

Car is an auto. Gonna take your suggestions to workshop and see what they think. Had a suggestion that it might also be boken engine mount? - Hopefully will be one of these!

Thanks again

Thanks guys

Car is an auto. Gonna take your suggestions to workshop and see what they think. Had a suggestion that it might also be boken engine mount? - Hopefully will be one of these!

Thanks again
Could be a broken engine mount. Could be spark plugs and leads... My old TR Magna did this same kinda thing... it was a manual tho, but whenever you gave it more than normal, soft acceleration it would vibrate a lot. Turned out to be running on 3 cylinders and the leads were all stuffed.

need a bit more info. when it happens can u feel it throungh the pedals or steering wheel?
can u haer it or just feel it. does it happen before or after that speed eg. does it go awyway when u gom faster. ur wheels might need to be re-balanced or maybe one of ur tyres has run out my tp had run out on one tyre and i was getting the vibration between 90-100

Definitely more information required.

Starting is this OK.
Does the engine idle smoothly.
In neutral gently bring the revs up - does the engine remain smooth or does it hesitate or misfire before revving.
In neutral again, blip the throttle - does the engine pick up and rev cleanly.

Driving.
Does the problem occur under acceleration or at steady speed. Try these conditions through the problem range.
1) Hard Acceleration, on the flat and up a nice steep hill.
2) Gentle acceleration
3) Steady speed - cruise
4) Very gently dropping dropping the speed by taking pressure off the accelerator
5) Taking off the accelerator completely
6) Braking down through the problem range.

Can you feel the problem through the car or the steering wheel, if the wheel wobbles slightly from side to side it is likely to be wheel balance.

In the problem range, if you back off the accelerator and let the car coast does the problem go away.

At higher speeds, if you push the accelerator down hard does the problem occur as well.
Usually if a misfire problem occurs it is the spark plug leads breaking down, inside of the distributor cap worn out or arcing or problems with the injectors.


If you can answer these type of questions then we may be able to pinpoint the problem.

Spud

sadly, unless people see the car, and feel the problem, looking for answers for that vibration online is probably not going to get you anywhere! i'd try a few different mechanics.. maybe even an auto transmission specialist

Nah, im with samuria, it sounds like an ignition problem at peak torque rpm in 2nd.

There is a rough but reliable way to check.. Unplug cylinder 1's lead and earth it (failure to earth can damage coil with secondary charge). Take for a drive, even know it'll be missing on a cylinder, the other problem when it occurs will cripple the car making it run on only 2 cylinders. If it is cylinder 1 causing the problems, then it will not get any worse in the specified problem area.

Replace spark plug lead 1, and move to number 2 repeating the process to check cylinder 2.



To further explain the problem, is the vibration a very high, consistant frequency, or is it a seeming random splutter of farts and coughs.


PS: It will not be an engine mount.