Vibration 1100-1300 rpm
08-30-2005, 02:37 AM
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Vibration 1100-1300 rpm
Hi all,
I am a new guy from the block and I have a small issue. I have 1997 S8 and it runs just great. However,when gearbox switches a higher gear on a highway and rpms are between 1100-1300 the engine starts "vibrating". It feels like engine is slightly choking. After 1300 rpm there is no problem. It was in the shop for two days and they found nothing wrong. Anyone else experiencing same problem? Possible solution most welcome.
Br,
Cablos
I am a new guy from the block and I have a small issue. I have 1997 S8 and it runs just great. However,when gearbox switches a higher gear on a highway and rpms are between 1100-1300 the engine starts "vibrating". It feels like engine is slightly choking. After 1300 rpm there is no problem. It was in the shop for two days and they found nothing wrong. Anyone else experiencing same problem? Possible solution most welcome.
Br,
Cablos
08-30-2005, 02:56 AM
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Re: Vibration 1100-1300 rpm
Hi,
It seems that other ppl have had same type of problem and that currently there is no solution for this "fault". Please keep me posted.
Br,
Cablos
It seems that other ppl have had same type of problem and that currently there is no solution for this "fault". Please keep me posted.
Br,
Cablos
08-30-2005, 04:28 AM
#3
Are you sure it's the engine and not the transmission shuddering?
I've found that when I (rarely) get a tranny shudder it is ALWAYS at low RPM and mid torque, which sounds lust like where you are.
08-30-2005, 05:17 AM
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Do you have this problem also when the engine is idling around 1000 rpm? If so,
you may have a misfiring cylinder: most likely a clogged fuel injector -> put 2 bottles of Chevron fuel injector cleaner in a full gas of tank and see if the problem disappears after 2-4 days of driving.
Good luck!
Good luck!
08-30-2005, 09:24 AM
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Re: Vibration 1100-1300 rpm
I have the same thing when the car is cold (98 A8 Q) not when it's hot. I know all my coil packs are good, but I haven't changed the plugs yet. I also have a lean mixture CEL that I can't find.
I attribute it to engine vibration, but couldn;t tell you exactly just yet.
I attribute it to engine vibration, but couldn;t tell you exactly just yet.
08-30-2005, 09:50 AM
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Re: Vibration 1100-1300 rpm
Additional info: I testdrove this beaty today for about 30 mins. Vibration occured ONLY on 4th or 5th gear. Vibration is small but distracting enough
Br,
Cablos
Br,
Cablos
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08-30-2005, 12:29 PM
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Check your Tyresmoke post
You'll go nuts looking for the cause of the problem like I did and even mechanics will think its the tranny but I'm sure its your coil packs or plugs. I was quoted for a new tranny at about £3500 but all it was, was a knackered lead/ plug on no. three cylinder.
08-30-2005, 01:19 PM
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Not necessarily...
again I'm no expert but in mine it feels sort of like a manual transmission being in to high of a gear for the rpm's. Now this MAY indicate a transmission prolem but it also MAY indicate that the DSP is taking over at a slower pace. I know that when I recoded the trans it got a lot better, but it still exists. I have a rebuilt tranny that's about 30k old.
Try resetting the DSP and driving it again. I beleive from previous posts - anyone correct me if I'm wrong - to reset the DSP you can shut the car off. Turn the key until the dash lights come on - do not start. Slowly depress the accelerator to the floor, hold 2 seconds, and slowly release the pedal. Start the car.
Try resetting the DSP and driving it again. I beleive from previous posts - anyone correct me if I'm wrong - to reset the DSP you can shut the car off. Turn the key until the dash lights come on - do not start. Slowly depress the accelerator to the floor, hold 2 seconds, and slowly release the pedal. Start the car.