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A few 996 C4 issues...

Mike!

Silverstone
Joined
6 Nov 2013
Messages
131
Hello, new to the forum (see my newbie thread), just picked up a 2002 C4 around 6 weeks ago and have a few issues:

Horrible rattle at the front end, especially when I first start my trip. Sounds like something is loose, loud but I wouldn't describe it as a 'knocking' or metal sound. First thought it was the arch or loose headlight but its all secure. Could be the suspension top mount, maybe an ARB bush or droplink, kinda clutching at straws I guess but maybe its a common thing?

The cabin can vibrate a little when sitting in traffic, little more than i've exp in my previous cars, not violent but just noticable. Could be the engine mounts?

Changing gear, especially into first, is notchy. Sometimes third too but generally when when I stop at lights it wont go all they way home into first without a push harder than selecting second for instance.

The clutch pedal is really heavy. The clutch itself performs as expected, but is a heavy clutch normal?

The oil on the dipstick doesnt seem to corrospond with the sensor readout on the dash at start up. Oil looks to be where it should be (between the two lines on the narrower section of the plastic marker) but the dash reads two bars, sometimes one and it flashes, then sometimes back to two, never a warning light though. Is this normal?

My alarm sometimes goes off randomly, I get a 'beep' when locking it but everything including the armrest and glove box are secure, if a sensor had failed Is there a method of determining which one? for the moment I have had to unplug the siren so I don't piss off the neighbours which isnt ideal.

Thats all off the top of my head. In general it's a bit squeeky and rattley which is disapointing, really harsh ride. I've always worked on my own cars so will be sorting it all myself when I get the chance.
 
Can't see your post while typing this but I'll try and remember point by point.
I'm a novice machanic and can only quote the problems I had.

Front end noise drop link replaced, noise clear for a week the returned, to it was the top bushes so booked in at a different specialist. Turned out to be loose drop link (bad job from first garage)

Oil gauge every time I park my car it reads different levels but oil always ok on stick. When car sitting perfectly flat it read full. Cream around filler is also expected on cars which do alotbofbshort journeys.

Clutch peddle hard. There is a helper spring the tends to snap. Cheap easy fix buy new spring from dealer.

Gear change. My problem is always second gear only when cold and have to ensure first few gear changes are firm. Once oil and box warm no problems. New gear boxes have oil heaters so don't know if it was always a common fault. Worry is the boxter gear box jumps out of gear regularly and requires many rebuilds, that we my fear with mine jumping out bit when checked by both dealer and specialist it got a clean bill of health.

Alarm I some times get a beep and other time silence not sure why but if I attempt to set and reset several times it crashes and I have to open manually before normal business is resumed.

Lastly I would get suspension checked out by specialist before ripping front end to bits looking for a rattle.

As mine had similar faults when I got it 12 months ago ya car sounds fine to me.
 
Thanks for the reply.

Just need to find the time to check everything under the car. As soon as I get these little niggles sorted, particularly the rattles, I can start enjoying the car.
 
I had a faulty micro switch in my centre console that kept setting alarm off and beep when lock ,

then the fun really started when the micro switch went in the door handle and in the middle of the night all the windows would go down and the soft top would open with the alarm going off ,,,,,,, give neighbours something to laugh about :oops: :oops: :oops: :oops: :oops: :oops:
 
Welcome to the forum, loads of good advice on 911uk.

Mike! said:
Horrible rattle at the front end, especially when I first start my trip. Sounds like something is loose, loud but I wouldn't describe it as a 'knocking' or metal sound. First thought it was the arch or loose headlight but its all secure. Could be the suspension top mount, maybe an ARB bush or droplink, kinda clutching at straws I guess but maybe its a common thing?

Sounds like you mentioned most items that could be the cause but also coffin arms may rattle.

Mike! said:
The cabin can vibrate a little when sitting in traffic, little more than i've exp in my previous cars, not violent but just noticable. Could be the engine mounts?

Engine mounts are a possibility, lots are getting old now and with the engine hanging from them they won't last forever.

Mike! said:
Changing gear, especially into first, is notchy. Sometimes third too but generally when when I stop at lights it wont go all they way home into first without a push harder than selecting second for instance.

Could be the cables require adjustment or the gearbox is slightly worn. Clutch being heavy may also be a clue. Is it usually more notchy when cold?

Mike! said:
The clutch pedal is really heavy. The clutch itself performs as expected, but is a heavy clutch normal?

Could be the clutch worn but most of the time it's the helper spring on the clutch pedal, mine was broken and fitting a new one really helped lighten the pedal.

Mike! said:
The oil on the dipstick doesnt seem to corrospond with the sensor readout on the dash at start up. Oil looks to be where it should be (between the two lines on the narrower section of the plastic marker) but the dash reads two bars, sometimes one and it flashes, then sometimes back to two, never a warning light though. Is this normal?

The dash gauge is more of a guide for daily checking but the true level is with the dipstick. My own dash gauge is quite accurate when comparing to the dipstick though.

Mike! said:
My alarm sometimes goes off randomly, I get a 'beep' when locking it but everything including the armrest and glove box are secure, if a sensor had failed Is there a method of determining which one? for the moment I have had to unplug the siren so I don't piss off the neighbours which isnt ideal.

As said it'll be most likely a sensor making the alarm think there is something open still.
 
Rockunrolla said:
I had a faulty micro switch in my centre console that kept setting alarm off and beep when lock ,

then the fun really started when the micro switch went in the door handle and in the middle of the night all the windows would go down and the soft top would open with the alarm going off ,,,,,,, give neighbours something to laugh about :oops: :oops: :oops: :oops: :oops: :oops:

Is there anyway of testing the switch to see if its faulty or not? other than bridging every switch one by one till the car stops beeping when I lock it?
 
Yes a diagnostics machine at any opc or specialist will tell you which one , :thumbs:
 
infrasilver said:
Welcome to the forum, loads of good advice on 911uk.

Mike! said:
Horrible rattle at the front end, especially when I first start my trip. Sounds like something is loose, loud but I wouldn't describe it as a 'knocking' or metal sound. First thought it was the arch or loose headlight but its all secure. Could be the suspension top mount, maybe an ARB bush or droplink, kinda clutching at straws I guess but maybe its a common thing?

infrasilver said:
Sounds like you mentioned most items that could be the cause but also coffin arms may rattle.

Coffin arms? I assume thats the control arms? Look like a coffin I suppose :) The ball joint was marked on the MOT as an advisory for slight play so might be connected to that.

Mike! said:
The cabin can vibrate a little when sitting in traffic, little more than i've exp in my previous cars, not violent but just noticable. Could be the engine mounts?

infrasilver said:
Engine mounts are a possibility, lots are getting old now and with the engine hanging from them they won't last forever.

I will check them out.

Mike! said:
Changing gear, especially into first, is notchy. Sometimes third too but generally when when I stop at lights it wont go all they way home into first without a push harder than selecting second for instance.

infrasilver said:
Could be the cables require adjustment or the gearbox is slightly worn. Clutch being heavy may also be a clue. Is it usually more notchy when cold?

I noticed the blue and black cables when replacing the shift linkage as it was a little limp. When reading a 'How To' guide it said make sure you put them back like before but noticed the black one was not tight, not as tight at the blue one anyway but the guide was quite adamant not to reconnect them any tighter than how they were before but I did wonder if it should be tight. It's more notchy when cold.

Mike! said:
The clutch pedal is really heavy. The clutch itself performs as expected, but is a heavy clutch normal?

infrasilver said:
Could be the clutch worn but most of the time it's the helper spring on the clutch pedal, mine was broken and fitting a new one really helped lighten the pedal.

I will check this.

Mike! said:
The oil on the dipstick doesnt seem to corrospond with the sensor readout on the dash at start up. Oil looks to be where it should be (between the two lines on the narrower section of the plastic marker) but the dash reads two bars, sometimes one and it flashes, then sometimes back to two, never a warning light though. Is this normal?

infrasilver said:
The dash gauge is more of a guide for daily checking but the true level is with the dipstick. My own dash gauge is quite accurate when comparing to the dipstick though.

Yeh I read they usually coincide quite well but mine seem to be out.

Mike! said:
My alarm sometimes goes off randomly, I get a 'beep' when locking it but everything including the armrest and glove box are secure, if a sensor had failed Is there a method of determining which one? for the moment I have had to unplug the siren so I don't piss off the neighbours which isnt ideal.

infrasilver said:
As said it'll be most likely a sensor making the alarm think there is something open still.

I will try and determine which sensor is the culprit, any suggestions on how to do this?
 
Rockunrolla said:
Yes a diagnostics machine at any opc or specialist will tell you which one , :thumbs:

Thanks. I called my local Porsche to get the car looked over but it was a 4 week waiting list for a booking, I travel quite a bit so have no idea if the car would be available 4 weeks in advance. Sure there is a private ex OPC Porsche specialist around where I stay so might give him a call.
 
If we knew where you are someone will int you to a nearby excellent indie.
 
I need to set my profile up.

Work in Aberdeen and live in Edinburgh.
 
Mike! said:
The oil on the dipstick doesnt seem to corrospond with the sensor readout on the dash at start up. Oil looks to be where it should be (between the two lines on the narrower section of the plastic marker) but the dash reads two bars, sometimes one and it flashes, then sometimes back to two, never a warning light though. Is this normal?

The drivers manual states: "It is best to measure the engine oil level with the engine at operating temperature. Correct measurements and short waiting times are achieved in this way."

It also says: "If the oil level display is faulty, this will be indicated by a warning message on the on-board computer".


In general it's a bit squeeky and rattley which is disapointing, really harsh ride.

Squeaks and rattles are very common.

Make sure that your tyres aren't too old, that pressures are right (36f/44r) and that your GEO isn't out as all these things significantly affect the ride and noise.

ps. :welcome: to 911uk.
 
T8 said:
Mike! said:
The oil on the dipstick doesnt seem to corrospond with the sensor readout on the dash at start up. Oil looks to be where it should be (between the two lines on the narrower section of the plastic marker) but the dash reads two bars, sometimes one and it flashes, then sometimes back to two, never a warning light though. Is this normal?

The drivers manual states: "It is best to measure the engine oil level with the engine at operating temperature. Correct measurements and short waiting times are achieved in this way."

It also says: "If the oil level display is faulty, this will be indicated by a warning message on the on-board computer".


In general it's a bit squeeky and rattley which is disapointing, really harsh ride.

Squeaks and rattles are very common.

Make sure that your tyres aren't too old, that pressures are right (36f/44r) and that your GEO isn't out as all these things significantly affect the ride and noise.

ps. :welcome: to 911uk.

Thats much higher pressure than what there currently is in the rear wheels, 44 is much hiher than I would have expected or have ever seen. InfactI never actually checked what the pressure should be as I just went with 32/34 when I was at a gas station in passing and didnt have documentation (its prob listed on the inside of the door or something). I will get them all pumped up to the right presure.
 
Mike! said:
Thats much higher pressure than what there currently is in the rear wheels, 44 is much hiher than I would have expected or have ever seen. InfactI never actually checked what the pressure should be as I just went with 32/34 when I was at a gas station in passing and didnt have documentation (its prob listed on the inside of the door or something). I will get them all pumped up to the right presure.

36/44 is higher than most cars but they are the correct pressures.

For some reason some people prefer to run a few pounds less but 32/34 must feel absolutely awful. :eek:

Start with 36/44 and you'll find it feels like a totally different and far nicer car to drive. :judge:
 
I'll give it a bash, however I would have expected the ride to get harsher and stiffer with more pressure?
 

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