turbo driving mannerisms

[Guest]

Hello chaps,
My turbo is going to Northway to have the belts retensioned after they were changed at the last sevice. Having had the car a few months I was wondering whether to ask Northway to have a look at the following points, but don't want to ask if they are normal mannerisms from a turbo, so here goes: (god that was a bit long winded![8|])
1.Getting off the gas at any speed, but particularly at lower speed is a very jerky affair. A bit like an on/off switch, no matter how careful I try to be lifting off the accelerator. Normal behavoir from a turbo, or something that can be adjusted?

2.I have a bit of an oil leak. (Pressure is spot on)

3.Steering seems a bit heavy (original wheels, a replacement 2nd hand power steering pump was fitted at the last service)

4.Turning the steering at parking/manouvering speeds is stopping the belt from running (the belt that is parallel with the front of the bonnet. Sorry, I'm a wiggy mechanic) but runs OK once steering movement stops. I'm hoping this one will be sorted with the retentioning.

Thanks in advance for any advice.

 

[Guest]

ORIGINAL: matt s

Hello chaps,
My turbo is going to Northway to have the belts retensioned after they were changed at the last sevice. Having had the car a few months I was wondering whether to ask Northway to have a look at the following points, but don't want to ask if they are normal mannerisms from a turbo, so here goes: (god that was a bit long winded![8|])
1.Getting off the gas at any speed, but particularly at lower speed is a very jerky affair. A bit like an on/off switch, no matter how careful I try to be lifting off the accelerator. Normal behavoir from a turbo, or something that can be adjusted?

2.I have a bit of an oil leak. (Pressure is spot on)

3.Steering seems a bit heavy (original wheels, a replacement 2nd hand power steering pump was fitted at the last service)

4.Turning the steering at parking/manouvering speeds is stopping the belt from running (the belt that is parallel with the front of the bonnet. Sorry, I'm a wiggy mechanic) but runs OK once steering movement stops. I'm hoping this one will be sorted with the retentioning.

Thanks in advance for any advice.

They can be a bit jerky, not sure but aybe the dump valve needs replaced.

Oil leakss.. lolss yes i think they were standard on new cars!!!

My power steering makes an od noise if i try and trun the wheel while the car is stationary too!! Might just be the belt slipping, the steering is mega heavy compared to modern cars, its really the main thing i noticed when i drove it. Kind of used to it now, even the gear change doent seem as stiff, but the linkages were replaced 3kmiles ago so maybe they are starting to loosen off abit now.

 

[Diver944]

Mine is also a bit jerky at slow speed but I do have a new dump valve. To check yours, see if you can suck or blow through the top port. If you can, the seal has gone and you are losing boost. It's only a £35 part from the OPC and the new one has metal internals so will last a lot longer. There is a picture of it at the bottom.

The pipe that runs off the top of it leads into your vacuum pipe system. It's worth changinging all of those pipes as leaks are common and can transform the car. Contact a local hose supplier or motor factor and you can get about 5 metres of vacuum piping for around a fiver.

Mine has a couple of small oil leaks. My garage tell me that as long as it's nowhere near the belts and I can live with it, it's not really worth the £100's to change the seals until they start gushing. Mine don't even spot the drive so I am not bothered. Engine bay concours types can open your eyes now []

Ditto the heavy steering at slow speeds, but it shouldn't stop the belt. Sounds like you need a new P.A.S belt or at least get it tensioned. It's not the same belt as the cam and balance belts.

 

[Guest]

Just a quicky, i replaced my new DV with one for the SAAB turbo... Same but only £26 actually if anything they are a tad better then the ones Porsche specify from Bosch...

 

[Fen]

Howling from the steering when turning the wheel while stationary or going backwards very slowly is almost mandatory on 944's (I think designed just to be embarrassing when parking at work in the morning). The belt shouldn't stop and if it has it'll more than likely be toast. The howling isn't as screechy as I'd expect a slipping belt to be (never had one on a 944).

The steering is generally really heavy as people have said. I like it that way, but it almost feels like a small, unassisted hatchback it's so heavy.

I don't remember jerkiness in my Turbo particularly. An Alfa 164 I had used to do it but it had a worn idle control valve. Cleaning the Alfa's helped for a couple of thousand miles then it got bad again. It also had idle speed problems when it was due for attention though, so maybe not your problem. Other things to check are the throttle sensor thing that detects when the throttle is fully closed. If it picks that up at the wrong point it would do strange things to the low (engine) speed behaviour.

I think most 944's leak oil around the belt pulleys and possibly the sump gasket / balance shaft caps etc.

 

[Guest]

That reminds me, i must replace all my Vaccume hoses some time. I dont think i have a leak but hey i bought the stuff from lyndsay Racing so might as well use it!! Job for the weekend me thinks.....At last something i can do that wil not cost me any money...

 

[944Turbo]

Mine was jerky recently - the vacuum pipe under the throttle valve had come off its very hard to see normally - I happened to have some pipes off for some other work and spotted it.

where is the oil leaking from?

Northway are very knowledgeable on the 944 and should be able to answer the questions and give good advice,

Tony

 

[wizard]

Matt
I second that from 944Turbo - just had a 12k service and sorted alot out.
My steering was heavy - thought I ought to get back down that gym again but relieved when I got the car back.
Not too sure what the cure was tho' - I had a small leak from the PAS reservoir and had a new water pump. [8|]

 

[944Turbo]

Just looked at the other posts in this thread properly, the vacuum pipe I was talking about is directly underneath the rubber pipe (connected to the hard pipe from the intercooler) top centre in the picture Diver944 posted.
Tony

 

[Guest]

Re -slim boy fat,

Could you plase let me know the part number for your Dump Valve ?
Thanks,

 

[Guest]

Will do, i think i still have the invoice will look it out tonight.

 

[Guest]

Thanks all for the advice. Managed to get it booked in for this Saturday, so hopefully all will be OK.

 

[hartge bob]

ORIGINAL: 944Turbo

Mine was jerky recently - the vacuum pipe under the throttle valve had come off its very hard to see normally - I happened to have some pipes off for some other work and spotted it.

I've been looking over mine today and I found a small bore pipe hanging free in this area. Reaching under the throttle valve I felt what feels like a nipple (oo er) with nothing attached. I assume this is the one you mentioned Tony. Only thing is I can't see how it fits, the pipe just ends, pointing in the wrong direction.

Should there be some sort elbow like on the top of the DV, or is there something else missing from my system.

Rob

 

[Diver944]

Rob, I've just checked mine and it's exactly how you say.

It feels like a 90 degree rubber pipe like the one on top of the dump valve. The nipple is horizontal, pointing towards the front of the car

 

[hartge bob]

Thanks Paul, looks like I'm missing the elbow.

Shall try my local motor spares emporium tomorrow.

Rob

 

[944Turbo]

Glad its (hopefully) that simple, I have a vacuum hose kit from Promax, So far I have only replaced a few lines completely (I think doing it well will take time), but it is very good for replacing the black rubber ends, I found many of them were quite hard and could be leaking.
Tony

 

[Guest]

Got my car back today, and everything is sorted[]
Just to let you know what the problem/cure was:
Slight oil seepage sump gasket area.
Found power steering hose top of pump loose and seeping. Tightened and topped up.
Slack power steering belt. Adjusted.
Jerky/lurching getting off the gas: Air pipes etc checked, found idle screw in throttle housing fully out. Removed and carbon build up cleaned off. Rubber 'O' ring replaced and idle speed adjusted.

Car is now much better/easier to drive, and I'm well chuffed.

 

[Guest]

ORIGINAL: simonpforrest

Re -slim boy fat,

Could you plase let me know the part number for your Dump Valve ?
Thanks,

Finaly.......

Part number is 4441895 (thats the SAAB one) By-pass Valve Cost £26.66 incl VAT