General Croma
- Thread starter doo1
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General Croma
Sure is it not the EGR valve?
Ok. I would bet it's the guilty party...with that kind of symptoms...
I don't know if it could be only a bad contact...or there is an error stored in the ECU that could be deleted. Maybe it could be helpful to connect a dyagnosis device with its software (eg. Multiecuscan) and watch what it says.
I hypothesize that there is nothing broken, otherwise the light would remain lit always. But I really don't know.
Anyway I think you have to look and ask in the "Doblo" section for this problem, while in "Miscellaneous/Tech Talk" there are threads about Multiecuscan and ECU diagnosis...
Hi,thanks for the info.
I have removed the egr valve from the croma and split the solenoid from the valve and cleaned it up,don't look to bad the,(the car has done 73k)do you know how far the solenoid pin should travel,and shoul it return to the out position when it is pushed in?.
Also I discover a lead with a plug hanging loose,the lead is routed in to the wire harness that is connected to the fuel filter, what is wire harness off?
I have removed the egr valve from the croma and split the solenoid from the valve and cleaned it up,don't look to bad the,(the car has done 73k)do you know how far the solenoid pin should travel,and shoul it return to the out position when it is pushed in?.
Also I discover a lead with a plug hanging loose,the lead is routed in to the wire harness that is connected to the fuel filter, what is wire harness off?
Fuel filter has TWO connectors.
One wide multi-way connector to the top of the fuel filter.
The second is on the bottom of the fuel filter and is for the "water in fuel" sensor. This is a smaller square connector with I think only two wires.
If this second connector is disconnected then I don't think the ECU picks up on this. This could also mean that you do actually have a high water content in your fuel causing you problems.
You need to put the connector back (assuming it is from the bottom of the fuel filter) and see if the water in fuel dashboard warning light comes on. If it does then you need to drain the filter via the tap on the bottom of it.
One wide multi-way connector to the top of the fuel filter.
The second is on the bottom of the fuel filter and is for the "water in fuel" sensor. This is a smaller square connector with I think only two wires.
If this second connector is disconnected then I don't think the ECU picks up on this. This could also mean that you do actually have a high water content in your fuel causing you problems.
You need to put the connector back (assuming it is from the bottom of the fuel filter) and see if the water in fuel dashboard warning light comes on. If it does then you need to drain the filter via the tap on the bottom of it.
tarquin1867
Member
While you are in that area ( exhaust manifold) try taking out the boost pressure sensor , it is about 2" to the left of the EGR. It will come out looking like a furry blob of carbon on the end . Clean with a spray of WD40 and very gentle application of an old toothbrush
. This cured my "nowt happening and turbo lag" at a stroke .
I don't know how to answer to this question....surely...till the end and the limit in a direction and in the other....you can't go wrong...if you push it (and then it returns out to the position if relesed) you will feel if it is all right...
Yes, absolutely
S130 told you about the connector on the bottom of the fuel filter.
If it was not, it would be better showing us a photo
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While you are in that area ( exhaust manifold) try taking out the boost pressure sensor , it is about 2" to the left of the EGR. It will come out looking like a furry blob of carbon on the end . Clean with a spray of WD40 and very gentle application of an old toothbrush
This cured my "nowt happening and turbo lag" at a stroke .
I think you are talking about inlet mainfold....and on the right of the egr (ok...on the left of you if you are in front of the egr)
Anyway...as far as I'm concerned...never had problems with that sensor on 402.000km of Croma and 260.000km of Alfa 159 (both bought new in 2006)....but a lot of problems with egr...at the end solved drastically
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tarquin1867
Member
You were lucky
. All that mileage and no sensor problems . One difference between our cars may be the type of diesel we both use I used "supermarket diesel " as its cheaper .
The boost sensor getting clogged with carbon gunk is a gradual process and one of the things you may not notice happening . But you will certainly notice the effect on performance after cleaning it.
Hi doo1,
I always recommend fitting a bullet / swirl mod gasket to the egr valve. That should sort most problems with it.
Def. recommend cleaning the boost sensor when you're at it anyway and for anyone else with a similar problem I'd recommend starting with unplugging the airflow sensor to see if that helps.
I always recommend fitting a bullet / swirl mod gasket to the egr valve. That should sort most problems with it.
Def. recommend cleaning the boost sensor when you're at it anyway and for anyone else with a similar problem I'd recommend starting with unplugging the airflow sensor to see if that helps.
I agree with you about the mod gasket. In fact with it mounted I had no problems with egr.
But I still had problems with dpf...so as far as I'm concerned, after all I eradicate both problems.
Why unplugging airflow sensor? Because the ECU enters in safety mode and rules out the EGR valve? Never tried this and I thougt that car couldn't go well with this primary sensor unplagged.
Actually never tried to drive with EGR valve connection unplugged.
Anyway doing things like that will cost errors saved in ECU memory also after plugging sensors back. Nothing serious...but annoying if you have not Multiecuscan to delete it...
I also recommend fitting a swirl plate / gasket. I did a guide for the 16V
https://www.fiatforum.com/miscellan...v-mjtd-egr-valve-restrictor-installation.html
The 8V is similar but a smaller oval plate with 3 holes. It has two effects, firstly it causes the EGR valve to open further, reducing sticking, secondly it increases the velocity of the exhaust gas and causes turbulance giving better mixing with the intake charge so less gunk settles in the manifold. Some people recommend complete blanking but this is technically illegal, increases emissions and you need a ECU remap to stop the engine fault light coming on.
Robert G8RPI.
https://www.fiatforum.com/miscellan...v-mjtd-egr-valve-restrictor-installation.html
The 8V is similar but a smaller oval plate with 3 holes. It has two effects, firstly it causes the EGR valve to open further, reducing sticking, secondly it increases the velocity of the exhaust gas and causes turbulance giving better mixing with the intake charge so less gunk settles in the manifold. Some people recommend complete blanking but this is technically illegal, increases emissions and you need a ECU remap to stop the engine fault light coming on.
Robert G8RPI.
Ref my point about the airflow sensor, when you're at the early stages of troubleshooting engine power problems it's an easy thing to eliminate.
The car won't run perfectly with the airflow sensor unplugged but if it runs better then there's a very good chance that it's at fault.
That doesn't mean that you don't also have an egr or dpf problem as well though.
Any errors thrown up by the checking process eg temporarily completely blanking the egr or disconnecting the airflow should clear after a few restarts with the sensor reconnected or blanking plate removed.
I once forgot to reconnect the egr sensor. The car ran OK for about 500 yards and then went into limp mode.
The car won't run perfectly with the airflow sensor unplugged but if it runs better then there's a very good chance that it's at fault.
That doesn't mean that you don't also have an egr or dpf problem as well though.
Any errors thrown up by the checking process eg temporarily completely blanking the egr or disconnecting the airflow should clear after a few restarts with the sensor reconnected or blanking plate removed.
I once forgot to reconnect the egr sensor. The car ran OK for about 500 yards and then went into limp mode.
They will be cleared on the instrument pannel probably but surely not in the ECU memory...
About problems with airflow sensor, I think you can have those if you don't change airfilter with the right frequency. My two cars (Croma and 159) with a lot of miles on are witnesses of that. I have never had air flow sensor problems with air filter changed often...
