Limp mode & no check light

[Thomas-the-Terrano2]

Ok, have previously joined other threads for this issue,

typically it worse when cold though still intermittent.

start up and seems ok as setting off but gutless, reving reveals
a max of 1700rpm +/-.

usually restarting engine clears it but has been known to take 3 to 5
restarts, can also kick in at speed, either have to slow down, stop and
restart engine or if down hill the wheels pushing the engine encourage
the revs past the spot and it carries on.

tonight leaving work down to 2 degree C, and gutless, AND revs only
make about 1000.

switched off, and on, same, repeated and cleared, just as well as
need to join 50mph dual carriageway outside work's car park.

To date no fault codes, other than 2 garages read turbo boost/over boost
which shouldnt exist on a 2.7tdi.

Had fuel filter replaced and fuel additive.

no obvious leaks, once running seems perfect.

 

[clivvy]

ok, you checked MAF? I assume your MIL light is actually functioning?

What about the battery earth, all ok?

checked the pedal assembly? Could be an accelerator pedal sensor fault (ECU doesn't know position of sensor), maybe give it a clean/spray with electrical contact cleaner (the small black microswitch on the assembly)

 

[Thomas-the-Terrano2]

Hi,

started off with idea of pedal, Jim lent me one but doesnt appear to be correct
one,

no fault codes for pedal. tps, read through your issues, on the old mav....

going to look at maf, after all at 12 years old wont hurt to try.

mil light comes on when starting engine then clears as normal.

did try spraying pedal thingy nearly choked on smell when it got
warm via heater thru foot well.

https://www.facebook.com/video.php?v=10204213550233903&set=o.159590877573669&type=2&theater

 

[solarman216]

No mil light, so first off what pump Bosch or Zexel? do you have EGR? try unplug maf, worse or same? pump button on filter is it hard? remove intercooler and get someone to rev engine, how hard is it to hold your hand over the turbo outlet, it should need reasonable effort, Rick

 

[Thomas-the-Terrano2]

2002 52 Bosch.

thanks Rick for ideas.

 

[solarman216]

2002 52 Bosch.

thanks Rick for ideas.

OK do not touch the Maf it is not serviceable at all, unplugging is a guide, you can test its output with a meter but for the values you will have to contact rayf, I have no data, if you have an EGR and it sticks open = your symptoms, try all the other tests and let me know, Rick

 

[makeitfit]

Does this only happen at start up ? If so and it's colder could it simply be glow plug issues ?

 

[solarman216]

Does this only happen at start up ? If so and it's colder could it simply be glow plug issues ?

he says it can also kick in at speed so does not sound like plugs, Rick

 

[Thomas-the-Terrano2]

glows were done last year, always fires up really well now.

worth chucking a new maf in?

egr? what does it do, ok I know exhaust gas recirculation but when/how.

 

[AlexD333]

Definately not glow plug issues, I had these issues several times, one of which was after several hours of off-roading getting very hot, it actually came on at 90mph truck lost all power, I pulled over (on the side of urge race track) and the truck would rev no higher than 1700 rpm, engine purring sweet as a nut. Called RAC out, didn't think to restart...

When he arrived he looked at me blankly as all was perfect...

The next batch was a cold morning indeed on the way to work, happened 6 times again limiting the revs to around that area.


All I can confirm on revs, it whatever the truck limits the revs to, it wont change until a reset has occurred.

As it happens my truck just cured itself of these symptoms so er... A bit lost there I'm afriad

On the other hand Rick recently blanked my EGR valve although before blank no symptoms for several months.

The only thing I can confirm is the fact these are the same symptoms of a maf amp overload as lazy ferret was describing as I have experienced this too.

I would love to find out the answer!

Who will be victorious :naughty

 

[AlexD333]

glows were done last year, always fires up really well now.

worth chucking a new maf in?

egr? what does it do, ok I know exhaust gas recirculation but when/how.

And I am guessing when the valve sticks in a certain position it will effect the running of the motor, possibly causing over or under performance, maybe leading to the symptoms described...

On a few occasions I sprayed mine and either it was coincidence or it cured my problem temporarily.

Open bonnet, drivers side at the rear of the lump, look for the gold top with the hose in it, disconnect the hose with pliers, fiddle about until you can get the thin hose of a wd40 bottle in the hole, spray away, reconnect hose and test :thumb2

 

[makeitfit]

he says it can also kick in at speed so does not sound like plugs, Rick

oops guilty of not reading all the above :surrender

 

[AlexD333]

oops guilty of not reading all the above :surrender

:lol were all guilty of that :clap

 

[Thomas-the-Terrano2]

ok just read egr valve threa, and seems if they gained them 2001+
then at late 2002 and a mk4 along with many others it will have one.

so if valve is messing around, is there a fix, or is the fix just blanking
it off, in which case does it then not matter what the valve thinks its
doing?

read of blanking an egr before, will ecu care?

 

[Blocky10]

Definately not glow plug issues, I had these issues several times, one of which was after several hours of off-roading getting very hot, it actually came on at 90mph truck lost all power, I pulled over (on the side of urge race track) and the truck would rev no higher than 1700 rpm, engine purring sweet as a nut. Called RAC out, didn't think to restart...

When he arrived he looked at me blankly as all was perfect...

The next batch was a cold morning indeed on the way to work, happened 6 times again limiting the revs to around that area.


All I can confirm on revs, it whatever the truck limits the revs to, it wont change until a reset has occurred.

As it happens my truck just cured itself of these symptoms so er... A bit lost there I'm afriad

On the other hand Rick recently blanked my EGR valve although before blank no symptoms for several months.

The only thing I can confirm is the fact these are the same symptoms of a maf amp overload as lazy ferret was describing as I have experienced this too.

I would love to find out the answer!

Who will be victorious :naughty

Alex. Was this also the time you had a clean up of the multi plugs between the engine and bulkhead?

 

[AlexD333]

Alex. Was this also the time you had a clean up of the multi plugs between the engine and bulkhead?

Yes :thumb2 but starting to lead onto other symptoms, low power generally which was a mainly due to viscosity of my fuel :thumb2

When I had the symptoms mentioned in this thread it just cured itself.. :nenau

 

[solarman216]

egr? what does it do, ok I know exhaust gas recirculation but when/how.

if it operates as it should no problem, but they get stuck, and if stuck open then def lead to your symptoms, the only reliable way is to blank it with a thin sheet of metal, tin can is perfect, easy cut and shaped, Rick

 

[AlexD333]

if it operates as it should no problem, but they get stuck, and if stuck open then def lead to your symptoms, the only reliable way is to blank it with a thin sheet of metal, tin can is perfect, easy cut and shaped, Rick

And you made a cracking job of mine, cheers again boss :bow :thumbs

 

[Thomas-the-Terrano2]

So at point of EGR its nearer the intake, so presume theres
a pipe of exhaust gas just 'sat' there.

Sweety mentioned the vacuum pipe being blocked, where does
this feed from. Presume not so easy to stop valve operating so
instead just blank it off instead so regardless of its operation
the engine doesnt have to eat exhaust anymore.

Humour me, should this be listed as a mod for insurance purposes.?

 

[Sweety]

I blocked the vac pipe on mine as a stop gap until it warms up outside & I blank the whole thing off:thumb2 the vav pipe comes from the solenoids on the N\S inner wing one pipe go's to the egr & another go's to the shut off valve (think that's it's name) on the inlet manifold. As for insurance it's not really a mod as your not going to get any performance gains from it & the place it's on a T2 no one could ever tell if it's blanked or not:augie Vauxhall have been making & selling egr blanking plates over their parts counter for years & my Dad went into our local dealer & got one for his Astra think it was something like £3.50:lol just shows what Vauxhall think of egr's:lol