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Discussion Starter #1
Hi All,

I need some help to put together a plan to get to the bottom of my problem - no torque below 2500rpm (motor is 1.9JTDM). I want to use the coming bank holiday weekend to finally sort this if possible.

Progress so far:
1. EGR valve cleaned by Alfa dealer - no effect.
2. Boost sensor cleaned by Alfa dealer - no effect - should I change it ?
3. Air filter looks to be clean as best I can tell - new one will be fitted at weekend.
4. EGR valve isolated using thin plate - no effect.
5. Turbo vane vacuum actuator seems to move when engine starts and also with increasing revs.
6. Air flow meter on order - will be changed at weekend.
7. Air inlet throttle butterfly seems to be working (only on key off, as expected).
8. Noticed that the hose from the turbo to the intercooler is very oily on the outside (all of it). All other components in the vicinity are not oily. No sign of any split in the hose. Bizarre.
9. I have not tried checking the boost pressure as I am not sure where to plumb in. I also do not know what the correct values should be.

I have also noticed in recent days that above 2500rpm I am also sometimes getting a flat spot.

If changing the filter and air flow meter does not sort my problem I have probably reached the limit of my capability.

Any suggestions would be really appreciated as I am struggling.

Thanks
 

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Regarding point 8, have you actually had the hose off to check it?
 

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Discussion Starter #4
Hi,
Did not manage to get the hose of as I was not confident of removing those weird clips without damage and did not have any jubilee clips handy.
Did examine it as best I could but could not see any split or holes.
Any idea what is could be if the hose is not damaged ?
Cheers
 

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Discussion Starter #6
Hi Smaky,
Just tried to drain the water, did not really notice any water and the there was no change in performance (I assume by the trap you mean the one at the bottom of the fuel filter / water separator).
Thanks for the suggestion though, I am ready to try anything I am capable of doing. Any others ?
Cheers
 

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my hose was the same when you remove it and clean it you will probably see splits (oil has got to be coming from someware) buy jubilees first then rip em off and bin em
the old clips i mean
 

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Discussion Starter #8
Hi Nelly,
I am almost praying that this hose is split, it could be the solution to my problem. Fingers crossed.
 

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Discussion Starter #10
Hi cookci,

Yes I purchased car like this a few weeks ago, did not pick it up during test drive (its a long story). No lights on the dash.
 
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he's not taken the light bulb out the dash then? Can you get a garage to check if any errors are coming up?
 

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Discussion Starter #13
have you tried a throttle or ECU reset?

Can you get a garage to check if any errors are coming up
I have not tried an ECU reset, thanks for pointing this out. Is there anything negative that can happen if I do this ? I do not want to add to my problems but would like to try it.

Errors-first thing I did was take the car to a local Alfa dealer for a health check. They tol me there was an egr error and an boost sensor error. The dealer removed and cleaned the components and that cleared the errors. Did not make any difference to the performance. I have since isolated the egr valve with a bit of thin plate, also no better performance.

Thanks for your ongoing help.
 
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I had a mercede C class which had lost all its power and flagged an ECU error. The merc specialists (under warranry) changed the "secondary air injection valve" which cleared the error on the ECU however the power hadnt come back. After I reset the throttle and went for a drive the power had come back... it was like a different car

Im not saying this is going to sort your problem but IMO worth a try... i dont know of any negative affects of trying this
 

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hi Guys,

this is what i did..... seams it works..


1. Disconnect the negative lead from the battery for a minimum of 45 minutes. Some people recommend overnight but that is not really necessary.
2. Reconnect the battery negative lead
3. Put key in ignition, turn to MAR and leave for 90 secs
4. Turn off the ignition, but not remove the key and leave for 90 secs
5. Start the engine but do not touch the throttle and let the car idle for 15 mins otherwise the car will not rev freely afterwards
6. Turn the car off and leave for 10 mins
7. Start the car and take her for a blast

Note:

3,4 = Throttle reset
rest = ECU Reset
 

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Hi All,
5. Turbo vane vacuum actuator seems to move when engine starts and also with increasing revs.
Thanks
If yours MAF is OK, maybe you should check this one more time, because lack of power on low revs is usually problem with regulation of VariableGeometryTurbo.

There are 2 posibilities:
- VariableGeometryTurbo control inside the turbine is stuck in high revs position, so that would cause low turbine efficiency on low revs (in that case cleaning of turbine would help).
- VariabileGeometryTurbo vacuum control rubber pipes are leaking, so that would cause low turbine efficiency on low revs (check all vacuum rubber pipes leading form little pump to turbine, usualy they split on endings and leak the vacuum).

Of course, if vacuum actuator on turbine is moving few mm when engine is started and changing revs, this is not the solution in your case...
 
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