Taxi Driver Online

My Fiat TW200 (Fiat SCUDO 2006 2.0 JTD) runs fine around the town. On the motorway it flattens out, no acceleration-no turbo it seems...back in town at 30-45 mph acceleration all back to normal.

I have replaced the MAF sensor and added cleaner in fuel for injectors. Slight improvement but still the same at high speed (60+?)...almost limp mode.

I ordered an interface cable /plug for usb-ELM327 to find what sort of fault codes were produced...it came today...the software CD was cracked!

So have any of you good people experience of this performance problem?
Any idea where on the web I can download a driver and software for this obd2 plug?

Might be a coked up turbo, see if you can get it to overboost, i.e floor it and watch it go into limp mode, other than that have a sniff around a Vauxhall forum as that JTD is also a CDTi, might find a similar story.

Check all the pipe work going to the turbo and from the air box they have been known to come apart, or split.
If there is a high pitch sound like a police siren when you floor it the turbo is on the way out

Thanks for advices Skippy and Doom, No wailing turbo yet, I know that noise well after 4 swined it up on the trots, all recons; thankfully during warranty.
It has been mentioned to me a valve may be blocking in the Turbo, this may tie in to the Ametech oil treatment I used last year to reduce friction and emissions, but did not renew it. Wonder if a good flushing oil might be the answer first?

Limp mode when floored has a ring of truth, though not a boy racer the only annoyance is above 50mph on the motorway when the turbo doesent want to have any of it. Have to drop to 3rd to wind the turbo and then it needs mothering to stay in to maintain 70. Mr Doom if when I go out the morrow, and floor it stationary...I assume this is what you mean, and it goes into limp...what would your next advice be please?

I have the CD on its way to replace the cracked one in the Elm327 interface plug/usb cable I ordered. Hoping this will show more, if I can get my head around the thing and the mysterious OBD2 codes etc. Update as I edit this post, I have found drivers that seem to work with a bit of jigging in device manager to a smaller port on a program called "Scan tool.net v 1.13"...but it will have to wait tomorrow till I plug it into the Taxi...might get arrested if I went out now in my nightshirt and a box of wires

Try the simple things first. Check your air filter and replace it if it showing any sign of being dirty.

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Grandad,

Na, you need to get it to about 60mph then floor it and hold it even though nothing is happening, if it goes into limp mode it's overboosted.

Some more thought on it, you could have a hole in the turbo hose, it only needs to be a pin [edited by admin] but it will still do the same thing.

Done that, it goes into seeming "limp" mode but without the engine management light coming on. (The lamp is working) ie it has a job maintaining 50MPH.

Low speed around the town and acceleration seem more powerful and frisky than normal?

What does "Overboosted" mean, what causes it and how will it be cured? Am I likely to cause damage running like this at the moment? Its not a problem, only on the motorway...

You say you changed the MAF sensor, was it new??? if secondhand it could be duff
Have you had the belt changed recently?? timing could be slightly out even 1 tooth can do it
Is one of the hoses collapsing when power is applied??, are they all connected and no splits

Are the engine revs going high when you are doing 50+

Skip could be right with the MAF, but also consider a slipping clutch as well, if it is the clutch you will get engine revs freely but not much speed increase.

MAF changed for a "VDO" new one. I did have the belt changed recently, could this really give these symptoms? I must admit to feeling pretty desperate in this, putting faith in a new garage after the old one took the pee over accident repairs.

Even the OBD2 reader I ordered via Amazon is not living up to spec to show the one fault code or display the engine timing?

Sometimes it's not paranoia - the world is against you!

As to the problem, the "air side" was what did it to mine a while back, a hole in a pipe. So had it fixed - cured - and two weeks later the Turbo threw a double Six.

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Chris The Fish

http://www.youtube.com/watch?v=Gdlyi5mc ... re=related

The quick way to check the MAS is to disconnect the wiring from it and take it for a drive, if the symptoms are still there you will have the culprit

Can you red line it at a standstill???

Definitely not a slipping clutch, this ones pretty recent. Engine revs constant (reducing?) when I hit 50-60 on Moterway with pedal to the metal.

At standstill I imagine it would red line if I pushed it.

My last Turbo that went was whining like a banshee, and just before it blew the power acceleration was massive, complete with brands hatch sound...would have made a boy racer proud. Then it blew! and discovered later at home it had sucked the engine nearly dry of oil. This is why the sudden power surge around town has me concerned, outside of warranty a new turbo will be Costa fortune peps.

In the absence of any whine, and while its perfectly OK for town work-motorway OK if 50-60 maintained; I shall be endeavouring to get this OBD2 plug working to read the fault code that's hidden and possibly be able to see timing on number one cylinder, this from skippys observation because I have just had the timing belt and water pump renewed...also a new oil seal in the camshaft bearing (not that this would affect). Failing the home DIY OBD2 readings, after checking out the pipes (there is no whistle whoosh audible) it shall have to be off to main dealer to be hooked up...This I dread, the diagnostics never seems to be able to give an overall summary; insignificant problems have to be fixed along the way (at a price) before the tester can move onto the next stage and before you know it are suckered, having spent this much so far to go the full distance with them...again at a price plus some more!

I have had to change a lot of fuel filters lately

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Justice for the 96. It has only taken 27 years...........repeat the same lies for 27 years and the truth sounds strange to people!

I think you've got a very small hole in the turbo hose myself.

Try this, hook the OBD up and leave it running while you make the fault appear and see if it comes up with anything, also if that OBD is a cheap china unit it won't do half the things it claims to.

So cheap remedies

Nwe air and fuel filters and a fuel treatment in half a tank of juice, if it's still there afterwards at least you've ruled them out and any future setting up will be within the parameters the software expects from new, what colour smoke are you getting and does it smell really acrid?

If it's white or on ide stinks and black with a trail of it coming out on idle it's likely to be the turbo, my mate had a brand new VW one the other week that lasted 24 hours, Garrett are having all sorts of issues with them right now.