Technical 1.9JTD loss of power, Help :(

[RobConn]

Hi all, newbie to forum and fiat's.

Basically, just bought a 2002 1.9JTD Stilo, but on the journey home there was no "ooomph" when you gave it some right foot.

Have a small amount of smoke when starting from cold, but then nothing.

"Pre-Heat" fault is flashing up but still starts well.

no other errors on screen.

Have tried to see if it was the MAF by dis-connecting it, but it flashed up "engine fault" and the accelerator did nothing.

dont know where to start really. just seems like there is no turbo.... (actually, where is the turbo? (new to diesels too)).

thanks in advance, Rob

 

[keviwal]

Hi.
https://www.fiatforum.com/stilo/238617-stilo-boost-valve.html
check out this thread
It could be your boost valve playing up.
Also have a look in the guides section on how to re-locate your boost valve.
https://www.fiatforum.com/stilo-guides/224083-stilo-jtd-boost-solenoid-valve-resite.html
Other things to look for is a blocked maf sensor.
when was it last serviced does it have a blocked fuel/air filter?
have you connected a fault code reader have you got any "p" codes?
if you get really really stuck i might be able to call in in a couple of weeks !!
I will help as much as i can as i nearly got to the end of my tether with mine. It chuffing flies now

Cheers

Kev Walker

 

[RobConn]

Cheers kev, well just been outside to look at it, after disconnecting the MAF, its coming up "Engine Fault" permanently now and the accelerator does nothing....

not got a code reader, but just ordered one off ebay (a vag com k-line one) plus full dealer workshop manual on CD.

looks like someone has already been tinkering with the engine wiring as a fair bit of it is out the tubing and tubing is missing in places. but the wiring looks ok, no damaged wires or missing connectors etc... but think a thorough strip of all ancilliary components (battery box, airbox etc) to check all the loom though.

rob

 

[keviwal]

Hi again,

It should run ok with the maf disconnected, as i understand it it just uses a standard set of values from the ecu.
can you hear any "sucking" noises which may indicate a split hose on the vacumm side of things.
If you look at the turbo which is right at the front of the engine you will see a vacuum pipe going to it. Trace this along to the boost valve it will be either down below the passenger headlight or relocated onto the side of the battery box. Anyway really really check this pipe and the one that goes from the boost valve to the rear of the engine. that could be your problem. I changed just as a matter of course, i used 4.5mm bore neoprene tubing which was about 1.50 a metre and relocated the boost valve.
Its a shame i dont live closer as i'm sure we could get it sorted in no time.


Cheers


Kev W

 

[RobConn]

thats what i thought, but it just seems to not want to know... hey ho, i'll disconnect battery for half hour and see if she'll drive after that. not holding out much hope though.

cheers kev.

 

[keviwal]

Rob Hi,

Hows it going are you any further?
have you tried anything?
Dont give up just yet !!
let me know what you have tried, we will get it sorted in no time i,m sure

Kev

 

[RobConn]

not much, well just literally finished looking over it, one glow plug is fubar, will get a replacement from andrew page or Euro car parts tomorrow. already repaired some wiring (the black/white from MAF and from Overboost valve plus others) had been badly joined together so have separated and joined them individually. also made sure all visible connectors were home, belled out the wiring from ECU to MAF. This wiring mess is of concern due to risk of damage so need to get some split tubing to cover as best i can but just want to get it running properly. cant check the DTC's as i dont have a VAGCOM lead any more and doubt if i order one tomorrow it will arrive before monday (when im back on 6am to 6pm shifts )

any recommendations kev?

rob

 

[keviwal]

Rob,
Have sent you a private message

Cheers,

Kev W

 

[RobConn]

and replied

 

[RobConn]

Hey all, just got the P codes from the car, so far found:

• P0608 VSS Power supply 1 (sig lo)
• P0120 Accel pedal sensor 1 (no sig)
• P0101 MAF (no sig)
• P1612 Fuel Filter Heater (no sig)
• P0404 EGR (no Sig)
• P0236 Overboost Valve (no sig)
• P0638 Throttle Actuator B1 (no sig)

Anyone suggest where to start? getting annoyed now.

have checked the muti-earth near battery, earth under engine ECU, belled out MAF and overboost back to ECU and they are fine.

need a guru :worship:

 

[Muppet1]

Whats the condition of the battery like, might be worth chucking in a new one, Have you deleted the codes and restarted the car????
Might be worth getting some contact cleaner and cleaning all the plugs and sockets on the maf, boost etc and even the ones like D4 under the fuse box by the battery.

Stilo's are very dependant on a good battery.

 

[RobConn]

none of the codes will clear, checked all the earths i can find, car is on a charger.

my suspicion is one of an earth issue, but trying to find a decent diagram to find out if all the sensors have an earth in common is a nightmare.

 

[keviwal]

Rob,
Have sent you a message

Cheers

Kev Walker

 

[Davren]

Rob,
Have sent you a message

Cheers

Kev Walker

@keviwal........ The whole idea of a forum is, well.. that it's a forum, where anyone can contribute to and benefit from the information posted.

Your continual sending of Private Messages to members in response to posts doesn't promote the idea, and excludes other members from benefitting from the information.

 

[keviwal]

davren,
Point noted, however it was just to say i had sent him an email .
I agree wholeheartedley with your comment and always wherever possible post my thoughts/views on any topics where i can share my limted knowledge!

Kind regards,

 

[RobConn]

why does my car not match the damn wiring diagram.

from example, my Overboost valve (item L36 on e-learn i think) has blu-wht and blk-wht coming from the plug on the car but E-Learn says LN/BL which according to a list i have found on here, relates to

• LN = blue-black
• BL = white-blue

:bang:

 

[keviwal]

Hi rob,
I will check to see if there is different wiring diagram , if there is i will lob it your way via email.

Cheers,

kev W

 

[Davren]

Hi rob,
I will check to see if there is different wiring diagram , if there is i will lob it your way via email.

Cheers,

kev W

If you do find another diagram, perhaps you could also post it here so that others reading this thread now, and in the future, could benefit from it.

 

[RobConn]

UPDATE:

managed to clear:
P1612 Fuel Filter Heater (no sig)
P0404 EGR (no Sig)
P0236 Overboost Valve (no sig)
P0638 Throttle Actuator B1 (no sig)

Turned out to be a supply issue, where the black/whites all join behind the engine (inside the loom), poor connection.

however the following still remain:
P0608 VSS Power supply 1 (sig lo) but this is not stopping the car driving.
P0120 Accel pedal sensor 1 (no sig) is my primary concern.
P0101 MAF (no sig) but i suspect a knackered MAF.

with reference to the accelerator pedal, i have tested continuity from pedal to connector under engine fuse box, from said connector to ECU and from pedal to ECU and everything seems ok.

Anyone have any suggestions? :bang:

thanks

 

[keviwal]

Hi Rob

Do you still get P0101 with the maf dsiconnected? Looks like i might be calling in at the weekend then !!
The others i really dont know , will have a think.
When you get the chance could you email or send a pm with your address buddy?

talk soon

Kev W