car is over reving and rumbling badly

metzengerstein

my friends car ,the rev clock keeps going up when its not in gear and theres a bad rumble from it also

anyone no if this is something serious .

Dartz

Possibly?

Is it a diesel? Give us some more information. Make, Model, Year, engine?

My first thought is that it's a diesel, and might be starting to run away, because of a small amount of oil leakage past the turbo. Which if it gets out of control will be a disaster for the engine because it'll have the same effect as jamming the throttle wide open.

Second thought is that the throttle just isn't closing fully...

metzengerstein

its an 02 seat ibiza petrol

flynnlives

clutch could be ruined

stevenmu

Does it stay idling at high revs, or does it jump up and down? The first is possibly a thermostat gone (the ECU thinks the engine is cold so runs rich keeping the revs up), the second is possibly the throttle body needing to be cleaned, both are common issues on those.

metzengerstein

was nearly thinking that ,and now i think of it i remember driving a van and this happened it also gave the gear stick a rumble and im pretty sure it was the clutch ,its probably on the way out


thanks flynn

metzengerstein

stevenmu wrote: »

Does it stay idling at high revs, or does it jump up and down? The first is possibly a thermostat gone (the ECU thinks the engine is cold so runs rich keeping the revs up), the second is possibly the throttle body needing to be cleaned, both are common issues on those.

it goes up and down and theres an awful clank and rumble noise ,that seems like its from the gearbox

flynnlives

does it spike when you change gears?

stevenmu

metzengerstein wrote: »

it goes up and down and theres an awful clank and rumble noise ,that seems like its from the gearbox

The up and down bit sounds like the throttle body, it would also clank and rumble when the revs go low enough that the engine nearly cuts out, but it shouldn't when the revs are high. Does it only clank/rumble when the revs are low, as if the car was stalling? If it's there all the time, does it stop when you press the clutch pedal in?

metzengerstein

stevenmu wrote: »

The up and down bit sounds like the throttle body, it would also clank and rumble when the revs go low enough that the engine nearly cuts out, but it shouldn't when the revs are high. Does it only clank/rumble when the revs are low, as if the car was stalling? If it's there all the time, does it stop when you press the clutch pedal in?

thats exatly how it sounds like its about to cut out sometimes ,its there when the car is idle with the engine on out of gear ,and also when stoped in 1st gear waiting at lights or something ,so no it doesnt stop when the clutch is pressed in, any ideas

stevenmu

It really sounds like the throttle body to me anyway. I posted here before about how to clean it out. It might not be the problem, or might not be the only problem, but it's quick and easy to do and worth a go IMO.

T83

As above, its the throttle body. 6N2 Polo's used to do the same... my old one did it. The Ibiza is the same car.

Muckie

Was working on a 04 Polo last week, sounded like a similar
problem, rev's jumping. EPC light even came on.
Turned out it just need the trottle bottle cleaned out
as well as a new set of spark plug. An awful lot of carbon
and dirt had built up.
Now running like new. Hope your problem is as easly fixed.

Dunne.Drift

Could be a air leak somewhere on the TB / inlet manifold..
IACV (idle air control valve)
thermostat is sticking the cold start on all the time..

my bet would be on a air leak or IACV!

metzengerstein

thanks to all ,;)

metzengerstein

hey all thanks again for the help,

i looked at my frends car changed the spark plugs ,sprayed the throtle body ,and put oil in ,the rumbling has now stopped problem solved

Muckie

Its great when it turns out to an easy fix after all, well done
and happy motoring.

metzengerstein

Muckie wrote: »

Its great when it turns out to an easy fix after all, well done
and happy motoring.

+111

yea it is and money saved on going to a mechanic too ,and brownie points for me from the missus