Alfa gt diesel 1.9 16v jtd wont rev - Alfa Romeo Forum
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(Post Link) post #1 of 21 Old 11-10-09 Thread Starter
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Not Happy Alfa gt diesel 1.9 16v jtd wont rev

Can any on help my Alfa gt diesel 1.9 16v jtd wont rev well it will rev to 4500 rpm in 1st and second gear.
But on the flat it will only reach 3700 rpm in 3rd and 3500 rpm in 4th and 3250 rpm in 5th it feels like I am hitting the rev limiter. I have been told it could well be a problem with the airflow sensor does this sound likely?

Thanks squirrell

Last edited by squirrell; 12-10-09 at 11:31.
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Hi mate, i would have a diagnostic check done... might just be a split air pipe or something..
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Does it smoke? Is acceleration slower than before?
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(Post Link) post #4 of 21 Old 15-10-09 Thread Starter
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Thanks for your replies chaps, I have not had the car long so it is difficult to be sure about the acceleration but it seems very good all the way through the rev range, except for the problem I have explained, And yes it does smoke a little when it is at what feels like the rev limiter at approximately 3700 - 3900 rpm in 3rd gear but not black smoke or grey but just a little dirty and with a definite hesitation and it just wont rev through this barrier. But then when I change gear off we go until the problem re appears.

Thanks
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(Post Link) post #5 of 21 Old 19-10-09 Thread Starter
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I have now been told it could be the Boost Pressure Converter Valve any thoughts?

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(Post Link) post #6 of 21 Old 20-10-09 Thread Starter
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I have now checked the air pipe from the intercooler to the throttle in case that was partly blocked (because at the moment if I am guessing it seems like the engine is not getting enough air) as it used to feel in the old days when pulling the choke out on a petrol car, but the pipe is all clear and so no change.

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Last edited by squirrell; 20-10-09 at 21:17.
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(Post Link) post #7 of 21 Old 26-01-10 Thread Starter
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Hi there, my GT was looked at by my local alfa specialists Intaservices of Leicester and they tried diagnostic testing and no faults found. But the my research led me to believe and was confirmed by Intaservices that the fault could be a problem with the variable geometry of the turbo charger (the vanes sticking) causing over boosting at high revs probably due to 100 k of steady driving by the previous owner. I have found this information on the net
<<8078TurboRemovalHOWTO.pdf>>
The last paragraph being the most relevant. I have also found these people the sell a product to clean the turbo

Innotec Supplies Ltd. - Turbo Clean Set for approx £35.
But this is what Intaservices recommended I use injector cleaner in the fuel regularly (about every time I fill up) for 5 or 6 tank fulls and to rev through to high revs moor often 1 to 2 times a day when the engine is up to normal temperature, this dose seem to have improved things a lot and most times now I can rev through to 4500 rpm.
Hope this helps and best of luck Stuart
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egr valve stuck?
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I had very simar problem

new egr and filters she is running well.
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I may get some that to give it a clean out.
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blank off the egr :-) do a search on the forum
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Would that make difference if it's all clogged?
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Quote:
Originally Posted by tomfromtelford View Post
Would that make difference if it's all clogged?
yep - stops anything going through the egr pipework. Will cost the price of a can of coke ;-)

obviously if its really bad the inlet manifold bay be gummed up as well....
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I had a new egr and got the manifold / boost sensor de clogged.

It must be the veins that are stickng every now and then.
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(Post Link) post #15 of 21 Old 02-02-10 Thread Starter
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Blanked of the egr today and no change, what next ?
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I thought the turbo clean worked?

So you have changed or checked
all hoses
maf
egr
map
turbo clean
vnt
?

What's your current state?

Good power across rev range in 1,2&3rd

low end power up to 3000k in 4, 5 & 6?

Mine is good in all except 5 & 6 above 3200k

feels like a bad flat spot, knoticed it was ok the other day, reved upto 4.5 k in all when warmer outside temp, which makes me think veins or vnt valve.
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Does it make a difference if you don't plant your foot I.e let's revs build up? That would point to overboost right?
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(Post Link) post #18 of 21 Old 03-02-10 Thread Starter
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Yes if I accelerate steadily then it revs through to 4500 rpm

If I am accelerating hard in 3rd but with a slight down hill it ok

But still wont rev through to 4000 rpm in 4th and 5th

I have checked all the hoses
Cleaned the maf
Cleaned and blanked of the egr
Not cleaned the turbo but have been using cleaner in the fuel
And what is the vnt?

Thanks for the reply’s
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Looking about you seem to have the same problem as me, only realy becomes a problem at lcence loosing speeds

I would get your veins looked at with that cleaner

the vnt is a valve that controls the vacum on the turbo/veins.

Post no3 on this thread
https://www.alfaowner.com/Forum/alfa-...-pressure.html

I'm going to try the vnt test this weekend.
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Mine was the maf
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I would also recommend cleaning/checking turbo.
Mine went on my Gt at about 65k. Out of warranty, and when I sent it to a well respected refurbishing place and they told me not to bother, beyond economical repair

To be honest, at the time the performance didn't suffer too much, more the whistling noise was a pain.

End result a bill for £900!
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