Misfire On 01 115 Pd (checked Other Topics)

[rayc]

Hi everyone,

What a fantastic source of information you guys offer.

 

My names Ray, I reside in Deal, Kent and have just purchased a 2001 115 PD Galaxy with 158000 miles one owner and full history.

 

When I purchased the car (EBay) the seller told me that it had a misfire then the turbo packed up.

 

I decided to purchase it anyway as it was nice and cheap. Fixed the turbo issue. Someone hadn't routed the turbo pipe properly and it was cut through by the drive shaft.

 

So, Turbo boost once again.

 

I still have the misfire from about 1800 rpm and when under load only.

 

I have taken the lid off the engine and checked all the connectors to the injectors. All nice and tight and tweaked up.

 

Changed MAF for a genuine Bosch from Euro Car Parts (

Edited October 13, 2007 by rayc

[NikpV]

welcome ...

 

have a look here

[rayc]

Thanks for that.

 

I have read that but unfortunately the reference pictures were no longer viewable.

 

Apart from his problems being slightly different (ie missing at idle) I will try and suss the multi plug on the front of the engine.

 

I forgot to mention. When driving the engine "runs out of steam" at 3750 rpm in any gear.

 

Could the crank sensor cause a misfire and not log a code?

 

Cheers

 

Ray

[rayc]

Well, after a run up the M20 and M25 I can now say it definately only misfires unload load situations.

 

It starts fine, Ticks over fine. Accelerate and it starts jumping / missing at approx 1800 rpm upwards.

 

When I purchased the car and drove it with the turbo not working I noticed it had a slight misfire then. Now I have reconnected the pipework it is much more pronounced.

 

I have a guy coming round with a tester to plug in and hopefully diagnose.

 

I'm leaning towards either the crank sensor (I've since read the bottom pulley can come loose) or the throttle potentiomter as it has a direct relationship with the throttle reaching half way and also it appears to be possibly under fuelling when it requires fuel for the turbo.

 

I have tried searching all over for pictures / write ups on how the PD engine works it's fuelling and timing advances. So ordered a TIS CD from Ebay.

 

This site has been fantastic in finding idea's for a solution. Once the guy arrives I'll see what he comes up with.

 

Fingers crossed it's a simple fix! B)

[rayc]

Well, the guy came round and put his reader in the car.

 

Showed a direct to earth fault on the maf (which we cleared assuming it was the old one)

and a turbo pressure fault (again cleared due to split pipe which was repaired).

 

Took car for a run with scanner plugged in. Misfires not registering on his unit and all readings for turbo maf etc were within range.

 

Disconnected MAF and drove. Car was gutless but had not misfire until we got on the open road where it was barely noticeable.

 

Switched off. Reconnected MAF and car drove well again apart from the misfire. I have been advised to take it to a bosch injection specialist due to no faults showing up. (Not even an injector issue, if they register?)

 

Scratch head again and look deeper. One interesting thing he said to me was that I should have invested in a VW MAF as they are properly calibrated whereas Bosch are generic. He also told me that he has had a high percentage of Bosch failures on MAF sensors but only around a 10% failure with dealer supplied (but it did show within range on scanner) B)

[rayc]

Went to Injection specialist today (Bosch)

 

They have diagnosed a spurious signal coming from the engine speed sensor.

 

Everything else fine.

 

He says it "could" be the dual mass flywheel moving and throwing the signal out.

 

Next stage will be take sensor out when I can find it!

[NikpV]

surely the previous scanner would have showna spurious signal from Engine speed sensor ??

[rayc]

Hi Nik.

 

No it didn't. Poss because I didn't rev it hard at standstill only took it for a drive with everything being scanned and I only drove to the point of misfire.

 

The Bosch guy revved it to what must have been the rev limiter where he noticed the signal fluctuation. Hence why he said it could be the dual mass flywheel.

 

I found the engine spped sensor and have just cleaned it off. Bit of engine oil over the electrode. So will take for a run later and see what happens.

[rayc]

Well,Changed the crank sensor today. Made no difference (so I now have a spare!)

 

I tried the revving it hard bit. Engine only revs to 4000 rpm and at this "limit" you can definately here the entrying to pick up and go further.

 

My question.

 

On a PD engine can someone explain how the fuelling etc works please.

 

No matter how much the car is booted (and during misfire) there is no black smoke from the exhaust whatsoever.

 

I am now beginning to think that fuelling must be too weak. I know the MAF is ok as that showed ok on the test bed.

 

Is it purely the TPS that enrichens the fuel through the injectors (ie supplies more)? or is there any other sensors etc that the fueeling side looks to whilst boosting via the turbo?

 

I really cant see any other issues (resistances etc checked on injection loom) that it can be apart from lack of fuel. I will get another filter tomorrow (Just in case) but I was told it was new to try and alleviate the misfire issue.

 

Sorry to bring up what must be an old subject but I'm thinking it may be a new slant on the problem

 

Thanks

Ray

[rayc]

Sorry, Also forgot to ask.

 

Do the fuel tanks pressurise?

 

Mine doesn't "hiss" when removing the fuel cap.

 

Thanks

[ianskill]

i had this problem as in the other thread mentioned by seatkid. i had misfire simaler to what you have.i didnt know the proper history of services on my vehicle. i changed oil,air anf fuel filter. no problems since,so i put it down to fuel filter,good luck

[rayc]

Changed filter today and had a good look underneath and re routed pipes etc. Noticed the vanes were extremely sticky on the turbo so I have freed them off by moving the arm up and down. Freed up nicely.

 

Noticed electric pump wasn't running so freed that up as well.

 

Took for a run and the car is still the same. Definatley got to be fuelling or throttle peddle not sending proper fuelling signal.

 

 

Back to getting filthy again I suppose! :(

[Jaguar09]

I too have been told to replace the engine speed sensor which I thought was the crank postion sensor on the front. Do you know if these are the same sensor or are they different ones? Ford dealer could only find this sensor on there systems. My car kangeroos at about 2000+ in 3rd gear upwards. Took it to the Ford dealer and they said it was the ECU or take it to VW for them to look.... VW said the engine speed sensor on the back of the engine, is there one there because I can not find it....

[rayc]

I cant find a speed sensor (Put a post on your other thread by the way) :wub:

 

My ford dealer says it's in the bell housing (if there is one!)

 

So mine is currently with them being looked on their test eqpt.

 

You will see I did ask on another post if anyone knew the whereabouts of the VSS (vehicle speed sensor) but drew a blank.

 

I can see it on the ford tis but I cant find it's location and also on my friends autodata but it doesn't show a location.

 

I also looked aroundthe engine but couldn't find any sensors apart from the one on the sump.

 

We'll keep looking! :wub:

[rayc]

The saga continues!

 

Have now changed. MAF 4 times. Map twice. Throttle pedal.

 

No codes. Ford today say they reckone is an air leak from intercooler ( I cant find one).

This drop in pressure due to leak is causing the problem.

I replied the MAP last week was causing overboost with the same supposed leak and I had the same problem.

 

Was then suggested I take it to VW as they have better testing equipment.

 

Can anyone recomend a VW speacialist in the Dover (ish) area?

 

The misfire is under load when you push the pedal past 1/4 way down.

 

Can only do 40 mph up hill in 3rd with mpg showing 9!

 

When driving on the flat it's fine as you let your foot up on the throttle. Pulls like a train but then misses when you touch the accelerator.

 

Ticks over fine. Can only rev to 4200 rpm stationary.

 

Feels like a vacuum pipe is off or leaking but all have been checked and ok?

 

Also I thought fuelling. Changed filter (even though it was new) and it's still the same!

 

Done everything as per other posts so I can only now take to VW.

 

Boost valve appears to be working ok as ford says it's doing as it should.

As there are no error codes they (and I) am completely stumped.

 

Hope someone can assist otherwise I can see me parting company with it which would be a crying shame.

 

Cheers

 

Ray

[alterego]

From what I've read it's possibly the connectors to the injectors on the injector loom.

Basically a dodgy connection to an injector affected by certain levels and frequency of vibration.

Apparently its a known issue in the dealer network. Try taking off the connections (under the rocker cover) and cleaning them, examine them and check they are not loose when refitted.

However the connector(s) may be shagged out so dealers would usually fit a new loom with new plugs.

[rayc]

Yes your right. I forgot to mention. That has all been checked and is ok as well.

 

Admittedly this normally throws a misfire code as well from what I've read.

 

Maybe it's an unfound air leak. Just need to find where though!

[Guest Sockett]

Yes your right. I forgot to mention. That has all been checked and is ok as well.

 

Admittedly this normally throws a misfire code as well from what I've read.

 

Maybe it's an unfound air leak. Just need to find where though!

 

Did you ever get this sorted Ray?