Technical Stilo 1.6 does not rev, car ok

[jjjjack]

Hi guys,
first thing I want to say sorry for my bad english, hope I can be clear
So, i already searched in the forum, but nothing has worked for me to totally solve this problem
Since last august my 1.6 16v Stilo started to have some problems.
First it was randomly shutting down while driving (it was scary) giving me "loose connection"
I fixed that by checking and cleaning the contacts in the battery/fuse box
Then, she decided not to rev. Check engine light on, the car won't rev over 1100 rpm and sometimes after some restarts gets past 1800 rpm
Using MES she gives me p1220 and p1687
I cleaned the Throttle Body without results so i did some research on the ecu
When I opened it up I saw some pins fallen through the board so I resoldered them back
It probably worked for 2 days then everything stopped working again:bang:
The pedal seems to be ok, I think..
I dont know what to do, I hope you guys can help me
Thank you a lot!

 

[kokkolin]

it's very possible that your ecu is on it's last days. 1.6 ecu have this problem especially if they are still on the engine, all the 1.6 stilo owners that I know have moved their ecu from the engine on the battery mount just to keep it away from the heat and vibration. if you had lose connection and pins that fell off that is a good sign of it going to fail, you can open it up again and check for all the pins and resolder them because you make find a lot of them having that issue

 

[jjjjack]

it's very possible that your ecu is on it's last days. 1.6 ecu have this problem especially if they are still on the engine, all the 1.6 stilo owners that I know have moved their ecu from the engine on the battery mount just to keep it away from the heat and vibration. if you had lose connection and pins that fell off that is a good sign of it going to fail, you can open it up again and check for all the pins and resolder them because you make find a lot of them having that issue

That's not good..
I forgot to say that i moved the ecu from the engine after I opened it, I put it on the side of the battery box
I checked if other pins were fallen but they seem ok
Do I have to resolder all of them?
Well if the ecu is fried I dont know if it's better to sell the car or fitting a new ecu...
I would like to fix it, if possible
I read something about the IC mc33186dh, is that the driver of the tb?

 

[kokkolin]

That's not good..
I forgot to say that i moved the ecu from the engine after I opened it, I put it on the side of the battery box
I checked if other pins were fallen but they seem ok
Do I have to resolder all of them?
Well if the ecu is fried I dont know if it's better to sell the car or fitting a new ecu...
I would like to fix it, if possible
I read something about the IC mc33186dh, is that the driver of the tb?

a ecu is about 2 - 300 euro second hand, but you can also repair yours, there are a lot of people who do this operation, a new ecu is also a good ideea but I'm not sure if you can find it and it costs about 700 euro I guess. you must check all the pins one by one with a magnifying glass to make sure that all of them are in good condition

 

[jjjjack]

a ecu is about 2 - 300 euro second hand, but you can also repair yours, there are a lot of people who do this operation, a new ecu is also a good ideea but I'm not sure if you can find it and it costs about 700 euro I guess. you must check all the pins one by one with a magnifying glass to make sure that all of them are in good condition

I'd really like to fix it myself, not only for the price, but maybe we can make some sort of "guide" for other people with this same problem (i know it's a common failure)
Are we sure that the problem is the ECU? What do i have to check inside the ecu?
Is there something else that i can check in the engine?

ps: i double checked the other ecu pins and they look ok

 

[kokkolin]

I'd really like to fix it myself, not only for the price, but maybe we can make some sort of "guide" for other people with this same problem (i know it's a common failure)
Are we sure that the problem is the ECU? What do i have to check inside the ecu?
Is there something else that i can check in the engine? piece no 3

ps: i double checked the other ecu pins and they look ok

you can also check the Rev sensor it's located on the timing belt side just under the engine, they tend to fail and it causes the ecu not to read the exact position of the pistons

 

[jjjjack]

Thank you a lot, tomorrow I'll check it and if needed i will change it
Can it be this rev sensor even if the ecu spits out p1220?

 

[kokkolin]

Thank you a lot, tomorrow I'll check it and if needed i will change it
Can it be this rev sensor even if the ecu spits out p1220?

that is the position sensor try to replace the throttlie body with another one just to verify that yours works properly

 

[jjjjack]

that is the position sensor try to replace the throttlie body with another one just to verify that yours works properly

Okay, I'll find one
Other things that I can check?
Thanks a lot guys!

 

[jjjjack]

I tried with another TB without results..
I don't know what to do

 

[jjjjack]

I changed everything but nothing has changed.. probably the ecu is fried
I'm gonna sell it for parts or scrap it if i cannot fix it.. what can I do?

 

[Ralf S.]

If you have a problem (or possible problem) with the ECU then you need to check it and fix that first.

That's the only way to be sure that all the other symptoms are different problems, and not all caused by the same (i.e. ECU) fault.

Some of the loose pins might not do anything (they could be common with other cars) but there's only one way to be sure and that is to make sure each pin is making a good contact. I would use a professional to get the ECU repaired.. they'll do a proper test and you'll have some guarantee and it should never fail again (at least for another 5 years).

The only other item that could be causing a shutdown problem is the TDC ("crank") sensor. You can change that to see if it improves things, if they're not too expensive... but I would only do it after checking the ECU.

Ralf S.

 

[jjjjack]

I agree with you, in fact im focusing only on the ECU because i'm pretty sure that's the fault
The point is, the car has 190k and it's not in the best looking conditions so it's not worth buying a new ecu (around 700€, the car was 1400€ two years ago)
I would like to try and fix it myself if i can, if not, i'll sell the car, but to fix it I need some info about the ecu, what to check about its components
It can be also a great diy guide for someone else
So if anyone has knowledge about those IAW 5nfs let me know
Thank a lot guys <3

 

[Ralf S.]

190,000kms is 116,000 miles.. it's nearly new!

I don't know about fixing ECUs but you're right that it's not economic sense to buy a new one.. it's going to be cheaper to fix the old one.

I think "all you have to do" is remove the ECU and check that the connection pins have not dropped. If they have, you need to open it and push them back out.. then solder them in place. There's also a chance that any of the PCB circuits have corroded (this causes them to burn out) or one of the chips/resistors/anything else has failed.. that's why I suggested getting some professional to repair it.

You could try a seconda-mano ECU from a breaker .. but you won't know if it's any good, or also broken. You will also need to get hold of the Body Control Module from the same car (the BCM contains the immobilisor codes - and I think these are verified by the ECU) and the key, since the key talks to the BCM. Changing ECU's is not a simple task.

But.. if it's the only option (if your ECU can't be repaired) then there are firms who can wipe the immobilisor code from the BCM/ new ECU so that they don't block your key. Your car won't have an immobilisor any more but that solves the problem of trying to match all three pieces. On an old car.. it's better than scrapping it.

Ralf S.

 

[Moreno83]

My ECU is the original 2002 ECU and still located on the engine and im already at 240.000km.
I have to say that i added much more ground wires in the car including to the ecu.

Just open the ecu and resolder the pins , its not that hard to do.

Did you check the MAP sensor?