Cant Get Over 60mph

[dewsy]

hi i have a vw sharan 1.9 tdi on a p plate dont no wat the problem ios but i cant go faster than 60 i get to 60 and it feels like someones pushing the car back so i cant go any faster. irts really peeing me off any ideas wat it could be cheers leigh

[jkspoff]

http://www.fordgalaxy.org.uk/ford/index.ph...amp;#entry62368

[f0ster]

hello

I have an n reg model that has had the same problem, with mine the power will drop off due to the turbo over boosting, when the ecu senses boost over 2.2kpa it shuts down and goes in to limp home mode to protect the engine,

on the early models you can reset the ecu by backing off the accelerator and then on again, on the later ones you have to switch off the ignition to carry out a reset, the cause is a bit more complex, first it would be an idea to check the operation of the waste gate, I checked mine with the car on a lift and disconnecting the actuator from the waste gate arm up the back of the engine, if it is sticking even slightly it needs to be freed off, you then need to replace all of the vacume pipes on the boost control circuit and also the n75 valve (that`s if the fault is still there when you sort the turbo)

[zorgman]

totally agree its the turbo, went thru the lot on mine new pipes thruout even inside the ecu done all the valves the lot pulled off the turbo and the arm was sticking so the best way is take turbo off buy a tin of oven cleaner and spray it in the exhast part of turbo till it froths take the actuator link off and work the small arm it will be stiff but keep at it till its moves smooth, carefully rinse out with warm water and put some oil in give turbo a spin the repeat the cleaner then rerinse use a hair dryer or a hot air gun to warm it up and get oil into it again the arm should just flop now put arm back on refit to car job done instant power now and yo should here the turbo whistle in ehaust.

hope the helps

[dewsy]

thanks i will try this hope it works as i get sick of cars but i am gonna get this running properly cheers will let ya all no if it works cheers leigh

[seatkid]

thanks i will try this hope it works as i get sick of cars but i am gonna get this running properly cheers will let ya all no if it works cheers leigh

I personally dont think its the turbo. You have a P plate so I expect its the 1Z 90 bhp engine. This is a simple fixed vane turbo, normally very reliable. After checking vacuum pipes in the turbo control system for leaks, cracks and being disconnected, check the air filter is not blocked then almost in all certainty it is the MAF sensor. See if you can swap it.

[tiny]

Do early diesels have a catalytic converter?

If so have you checked it?

When they expire, the core usually collapses and if this happens they can block the exhaust (happened to my petrol).

Crawl underneath and give the cat' a good thump, if it sounds as if something moves inside then that could well be your problem.

 

A tell tale sign would be that performance would be poor in all gears at higher revs.

[seatkid]

Disconnect the MAF sensor and see if it makes any difference.

[f0ster]

HELLO

this model has a waste gate to control the boost, they are very prone to sticking especially if they have been driven around slowly, this type of driving will not allow the waste gate to keep moving, the cheapest option is to try swapping the air flow sensor with a known good one, (if you can get hold of one) if that is not an option the next cheapest option is to check the waste gate for operation up the back of the engine, you will have to remove a small circlip from the end of the pushrod, (make sure it does not go in to orbit as you pull it off)

[big_kev]

I personally dont think its the turbo.

 

I don't think its the Turbo either, most likely MAF ( could be relay possibly).

[mk2vr6]

tbh I'm in shock that a TDI driver actually wants to go over 60mph! wont that screw with the mpg figures? lol:

[Dave K]

tbh I'm in shock that a TDI driver actually wants to go over 60mph! wont that screw with the mpg figures? lol:

I have the same problem with my 2000 1.9 90bhp. I have changed the MAF sensor and have checked the hoses. The strange thing is, it used to go into 'safe mode' when the engine warmed up. Lately, however, it has been doing it within a mile of leaving home. Maybe the recent freezing weather has had a strange effect?

[seatkid]

I have the same problem with my 2000 1.9 90bhp. I have changed the MAF sensor and have checked the hoses. The strange thing is, it used to go into 'safe mode' when the engine warmed up. Lately, however, it has been doing it within a mile of leaving home. Maybe the recent freezing weather has had a strange effect?

Check the vacuum reservoir, its a tennis ball sized sphere at the front of the engine. Sometimes the pipe/bung becomes loose. Note this vacuum reservoir thing only applies to PD engines.

[Dave K]

I have the same problem with my 2000 1.9 90bhp. I have changed the MAF sensor and have checked the hoses. The strange thing is, it used to go into 'safe mode' when the engine warmed up. Lately, however, it has been doing it within a mile of leaving home. Maybe the recent freezing weather has had a strange effect?

Check the vacuum reservoir, its a tennis ball sized sphere at the front of the engine. Sometimes the pipe/bung becomes loose. Note this vacuum reservoir thing only applies to PD engines.

Thanks, I'll check it tomorrow.

[tiny]

I have the same problem with my 2000 1.9 90bhp. I have changed the MAF sensor and have checked the hoses. The strange thing is, it used to go into 'safe mode' when the engine warmed up. Lately, however, it has been doing it within a mile of leaving home. Maybe the recent freezing weather has had a strange effect?

Check the vacuum reservoir, its a tennis ball sized sphere at the front of the engine. Sometimes the pipe/bung becomes loose. Note this vacuum reservoir thing only applies to PD engines.

 

 

If its a 90 its not a PD

[seatkid]

If its a 90 its not a PD

 

IIRC in 1999 the AHU 90bhp engine was replaced by the ANU 90bhp engine which I think is a PD variant.

Edited February 23, 2009 by seatkid

[tiny]

If its a 90 its not a PD

 

IIRC in 1999 the AHU 90bhp engine was replaced by the ANU 90bhp engine which I think is a PD variant.

 

Ah well, every days a school day. Would have put money on the PD being 115 and up!

[ncb]

BUMP dewsy.

 

Did you ever get to the root of the problem. I have a tdi 115 pd and have the exact same problem. Gets into limp mode ie not over 60mph when you try to rev the car in 3rd gear like when entering a motorway. I am going to take the air intake and egr off to give a good clean when the weather gets a bit better. Just hope it is that and not the turbo actuator or vanes.

 

Any tips on taking off the air intake and egr? Is it easier from the top or under the car?

Edited February 11, 2010 by ncb

[big_kev]

I don't think its the Turbo either, most likely MAF ( could be relay possibly).

 

Could even just be a dodgy brake or clutch switch......these can cause havoc with the ecu.

[richaber]

I don't think its the Turbo either, most likely MAF ( could be relay possibly).

 

Could even just be a dodgy brake or clutch switch......these can cause havoc with the ecu.

 

Well, I had all these problems on our old R reg 90bhp, changed all the tubes, checked the valves, checked the turbo and wastegate, but would still suddenly lose power as you were accelerating away. I am convinced to this day that the problem was dodgy connections in the multiplug on the fuel injector pump, possibly the feed to the stop solenoid, not keeping it open fully and starving the thing of fuel. I gave the whole lot a good clean and wiggle and it was fine for the last 3 years we had it.

[AMacdonald]

I recently had an identical problem with my 97 Alhambra TDi. Not dropping into limp mode but starting in it. After much mucking about with vacuum pipes (although they needed doing anyway) I remembered my old copy of VAGCOM and diagnosed a wiring fault on the needle lift sensor. As soon as I fixed that (corroded spade connector) the car immediately came back to normal. Edited February 13, 2010 by AMacdonald

[richaber]

I recently had an identical problem with my 97 Alhambra TDi. Not dropping into limp mode but starting in it. After much mucking about with vacuum pipes (although they needed doing anyway) I remembered my old copy of VAGCOM and diagnosed a wiring fault on the needle lift sensor. As soon as I fixed that (corroded spade connector) the car immediately came back to normal.

 

I can't remember now, but does that sensor go through the connector block on the injector pump?