Technical stilo with big problems help needed

[mad max 2]

Fiat Stilo with big problems help needed, it is a bit of a long story so bear with me. car dropped a cam belt, removed head found it in uneconomical repair, so installed 2nd hand engine. previous to this the map wires had burnt through on the exhaust, now 2nd hand engine fit, nothing but trouble, running lumpy on idle after warmed up runs perfect cold? cleaned throttle body out to no avale, doesnt seem to be a signal to the black wire on lamber sensor pre cator post cat, could it possibly be a ECU problem. thank you

 

[Deckchair5]

What engine is it?
Have you repaired the MAP sensor and inlet air temp wiring?
There is no signal from the ECU to the lambda sensors, the signal voltage comes FROM the lambda sensors once they're hot enough

Are you sure the newer engine cambelt is synchronised correctly for crank to camshaft timings?

 

[mad max 2]

Hi Decks, I hold you in great esteem, having read some of the posts, this engine actually came out of a perfect running car along with all wiring looms. I fit my old ECU onto this engine....where do I go from here as I am used to plugs, points and condensers?
Thanks for your speedy reply,
Rob

 

[Deckchair5]

What engine is it?
Do you have diagnostics capability for checking engine running data so you can see what's going on?
Is it original engine lambda sensors in there? What voltage signals are coming out of pre cat lambda on black signal wire? I'd be looking for oscillating 0.15v- 0.85v every sec at hot idle

Have you checked the obvious, like plug gaps? (Sorry, have to ask)
Have you tried removing coil connectors one at a time to see if one cylinder coil is causing problems?
Have you tested pre cat lambda sensor heater wiring for continuity?
Does the engine otherwise run absolutely fine above idle rpm?

 

[hanzs]

There should be useful to do "Self adaptation reset" in FES, because old ECU was moved to "new" engine. Maybe also "Phonic wheel reset" (both for 1,6 petrol engine).
But maybe problem is in damaged cables during engine exchange... Are there some faulty codes in FES?

 

[mad max 2]

Hi, thanks for the reply.
Only fault code I got up on the dash was the fuel sensor?
Cheers

 

[mad max 2]

HI plugs are ngk with 0.9 gaps. have not tried disconecting coils,because thay seemed ok once past 2000 rpm engine reves well.just seems to be hen engine gets warm it gose off song. ie fuel don to 16 to gallon . tride back probing wires for heater 15.8?

 

[richydraper]

have you had FES on it to see whats going on?

 

[mad max 2]

Hi rich. no have not tried any thing like that yet

 

[richydraper]

as already said bud best thing to do would be get all the wiring repaired and then start from there... then grab yourself a half decent ELM327 lead and a free copy of FES engine code reading and reseting is free and you can monitor all the sensors to really see what's going on as soo many members will tell you FES is an absolute godsend for diagnostics on these!

 

[mad max 2]

Hi i got all new wiring from doner car also bought a new map sensor to no avale. But will get a lead asp thanks it sounds like the only way forwards. cheers.

 

[Deckchair5]

Ok fuel level sensor fault is most likely simply because you have low fuel state and a low voltage battery

Is that 16mpg ? Mind you it's going to be low if you're not going anywhere but if that's from normal driving around then there's a huge over fuelling and that's likely to be MAP sensor, it's manifold inlet air temp or precat lambda sensor
I've seen massive over fuelling when the inlet air temp sensor was broken so check your wiring
Is the exhaust all ok with no blowing?

If you can hook up running diagnostics and see what MAP and inlet temps are being recorded along with lambda readings then you'll see what's happening

 

[richydraper]

here to help bud!

 

[richydraper]

before i forget max... this may help too

https://www.fiatforum.com/stilo/262613-obd2-p-b-c-u-codes.html?p=2698283

or this one i cant remember if olly posted the up to date version (sorry if this is repost mods)View attachment OBD2 P-B-C-U Codes.zip

 

[mad max 2]

Hi am going to invest in some diagnostics. good advice. I was driving about getting 16 to gallon! Map sensor is new, but disconnect it when running, engine cuts dead.Where is air inlet temp? Should the lambda have a supply to it? And exhaust has a very slight blow where pipe joins cat at bottom cheers Rob.

 

[mad max 2]

Thank you for the info where do i get a lead from? Is it for the lap top, all so have you got any info how to down load FES? Dont use the computer much, still learning...including typing! Sorry about the delay..

 

[Deckchair5]

Air inlet temp sensor is integral within the MAP sensor so if it's a new one then it should be ok but I've had a new one before where the temp bulb was broken

Spot the difference? New and broken one is on the left

Only power supply to the lambda should be the heater -the 2 white wires- which should have 12v and earth
Black wire is signal which should give 0.15v to 0.85v when hot running


Slight blow can cause lambda reading to return wrong values but 16mpg is criminal so I'd go for air temp sensor and diagnostics would let you see what air temp is being recorded

 

[richydraper]

click on the FES link above and click the little 'Download' button on the webpage...

it is a lead for the laptop any of these...
http://shop.ebay.co.uk/i.html?rt=nc..._Tools_Equipment&_fln=1&_trksid=p3286.c0.m283

by the way WELCOME TO FF!!

where abouts in the country are you Rob?

 

[mad max 2]

Tell you what decks. Its the only thing i have not looked at, I am going to check it tomorrow will keep you posted and thank you for your time and patience.

 

[mad max 2]

Hi there Rich, I should have introduced myself as a new member...I am from Lancashire.
Thanks for the info, its been most welcome.