midnight_man

Escort cosworth with sierra L8 ECU, 2 bar map sensor, pectel bb + standard chip from RP Lab.

- all 4 spark plugs look like that one... Its a rich mixture? Whats your opinion? Thanks!

martysmartie

iTrader: (1)

Could be many things, was it running correctly and just started playing up?

You say standard chip but that is assuming a Sierra NOT an Escort, the latter has a bigger turbo charger, and so you will cause major problems if it's not mapped for it.

What injectors do you have?

Apart from that there are other things such as bad CTS, fuel pressure etc.

Martin

midnight_man

Standard blue injectors, fuel pressure is OK, about 3,5 bar. I tkink that Sierra 4x4 sapphire and Escort big turbo have same engines...or not? And same Turbochargers. Or there is any difference between Sierra 4x4 and Escort 4x4 turbochargers? Thanks!

I know only about 1 difference...that sierra L8 has 2 bar map and escort has 2,5 bar MAP.

I tried to make closed loop test mode today....diagnostic say that mixture is lean .....

opposite lock

iTrader: (3)

Big turbo Escos uses the T35 , Sierra 4x4 uses T3 .

midnight_man

ou...that is the problem.... Anybody know inner diameters of T3 and T34 Compressor housing? I will make check Thanks!

/// Update, these are all numbers from turbine:
for my turbo:
Garrett TBO384, cust P/N YB1001,ATD 465189-3, SN TF0217A, A/R 42 ?

Can anybody say what is it?

LHD220Turbo

iTrader: (4)

they difference in the size of the turbo's is very obvious.

post a picture of the one you have and it will be fairly obvious if you have a t3 or t34

midnight_man

www.wi-telecom.sk/ecus/cossie/1.jpg
www.wi-telecom.sk/ecus/cossie/2.jpg
www.wi-telecom.sk/ecus/cossie/3.jpg
www.wi-telecom.sk/ecus/cossie/4.jpg

Thanasis

iTrader: (3)

the original turbo from escort is T35 with front housing .60A/R and little bigger compressor wheel than T3 2wd turbo,and the exhaust housing is .63, the 2wd cosworth the turbo is with 42A/R front housing and .48 exhaust housing,the 4wd sierra have the same turbo, T3 as 2wd but little difference in the front wheel,is little bigger! i hope this helps

your turbo is T3 from 4wd

midnight_man

Thanks !!! Yes It will help

So I have L8 ECU with pectel board and chip made by RP Lab (due to pectel board) - standard map.

- I changed 2,5 bar sensor to 2 bar map sensor (due to L8 Ecu from sierra)
- I have T3 turbo from sierra 4x4 (thats OK, because I have L8 ECU)

So....is there any other issue? I still have black spark plugs ....


( RP lab says, that they dont know if Lambda sensor will work - due to Pectel BB) ... But this engine without Lambda is the same as sierra red top cover...yes? So it should be OK...

Viktor

Car is running OK, little higher idle (need adjust ), but I worried about this black spark plugs...

Thanasis

iTrader: (3)

the fuel pressure must be 3bar at idle and 3.5bar without connect the vacuum pipe!

midnight_man

So finaly we know the problem..... leaky pipe from amal valve to actuator. So car was overboosting (because regulation did not work)...and veeeery long time to reach boost level. I think the problem with "black spark plugs" will now disappear

Stu @ M Developments

iTrader: (12)

Hi,
You cant look at spark plugs to test fuel mixture, just put it ona CO machine to test mixture at idle and a dyno or wideband on the tarmac to test it at cruise and under load.

Even the most perfect of Cosworths will have plugs that look like that under certain circumstances. (Cold start for example)

The only correct way to check via plug tips is to cruise for 10 miles at a set speed then TURN OFF the ignition and coast to a halt and pull the plug. Not ideal...

midnight_man

So the problem is still there . The sparks are "burned black". After 2-3 days I cannot start engine. I must clean the spark plugs and then engine will start OK.

(Its true that I have lot of cold starts).

What can cause this very rich mixture? I checked all sensors (ACT, ECT, TPS), reasinged air gaps on phase and crank sensors.

There is an TPS error with ignition ON. But TPS is OK and wiring to ECU too. When I slightly push the accelerator the fault will disappear.

Closed loop test mode on ECU says that mixture is LEAN

costina

iTrader: (1)

What TPS do you have? L8 run a PF09 and must be set correctly if You have the IAW software you can set it as near to zero as possible.

Closed loop don't work on mine even with a sensor on the software. As Stu says the only way to check is buy a wideband gauge. There cheaper than a engine rebuild due to bore wash or a holed piston.

Check fuel pressure reg isn't leaking fuel back down vac line into intake on idle.

Regards

Paul

opposite lock

iTrader: (3)

Maybe totally off here but would it matter what L8 the OP has. Red and green label cat/non/cat?
And As above check the FPR to eliminate and double check your TPS is pf09.

costina

iTrader: (1)

Chip related from what I understand. hence why you can buy a closed loop chip for either ecu.

martysmartie

iTrader: (1)

Correct, the hardware is the same. That said if you have C/L and run without it, it will log an error.

Martin

midnight_man

Yes I have red PF09 (from lancia integrale). I am sure because i changed it. When I bought a car there was PF01.

I have L8 green ECU + pectel issue no 3. babyboard. And chip is made by Rp-Lab (OE maps). But RP lab cannot say if there is closed loop fueling working.... Its very complicated. I sended them a chip for my pectel (tunned) and they place OE maps to this chip.

How I can set TPS???? I just put it on without moving (there are ellipse holes for turning the TPS).

I have a problem with cold idle. Engine on idle is going UP and DOWN from 500 to 1400 rpm. still until engine gets hot. (I have no idea why) (sometimes on crossroad engine will turn of because idle drops UP and then down...)

I read that L8 ecu can learn idle value from TPS by driving a car.... But there must by some problem, I tried to change setting of idle screw on thortle body but without result. I turned it clockwise until screw stops me and then cca 2-3 turns back.

Any idea? Thanks.

I will check VAC line for pressure sensor ..thats very good idea! Thanks.

costina

iTrader: (1)

Loosen 2 fixing screws on tps plug in you iaw monitor and turn until you get near zero what is your figure now at closed throttle? If tps is not set correctly it can cause idle issues. Once you have set the tps run engine till warm and disconnect iscv and set base idle to 850-900 rpm.

Just check the lancia PF09 is correct and wired correctly??

What loom are you using?

Regards

Paul

midnight_man

I havent got IAW monitor I will try unplug ISCV when engine gets hot and set base idle. But I think that engine will go OFF when I unplug ISCV
Maybe I can make little turn on TPS and try.

Lancia PF 09 is same (weber)

I am using standard loom.

But there is another problem I dont know the base position of idle screw on thortle body. At cold start ( 6°C ) i have 1500 rpm. Idle screw rising the idle turning anticlockwise?

costina

iTrader: (1)

Ok undo 2 screws pull away from housing and where it sits without spring pressure tighten up.

On start up what colour is exhaust? does it puff black on boost?

Idle at cold should be around 1200 rpm on enrichment (choke). clockwise to decrease idle anti to increase adjust when fully upto temp.

midnight_man

When I changed TPS I use same method. So now i have tps in "base position".

After start there is no black smoke, its white...

When engine gets hot idle will stabilize on cca 1000rpm (sometimes it jump on 1300 and go back on 1000)

When its cold the idle is going up and down....still until engine gets hot.
Sometimes engine switchs off itself...because idle drops..

- I dont understand what is ECU doing by jumping with idle from 1000 to 1300) I think that ECU cannot stabilize the idle....but why?

Before we changed head gasket there was not this problem. Engine idle was pretty 900 rpm...
THanks.

Viktor

costina

iTrader: (1)

Usually buy removing head and doing work disturbs the wiring loom and creates more issues as looms are old and fragile.
Check for air leaks from pipes map sensor, fpr, dump valves etc

good luck

midnight_man

Yes you are right...

but I have -0,6 on turbo boost gauge on idle so there is no VAC leak from the system or?..

I have new MAP sensor with new hose.

Tommorow I wil check the fuel rail preesure VAC line and other VAC hoses..maybe.

Thanks-

midnight_man

So We know the problem

Idle screw.... basic idle on hot engine (with iscv unpugged) was only 500 rpm +-.
So on idle ECU runs on ISCV...

After I set basic idle on 900rpm everything is fine!

Thank you COSTINA!!!!

But I have still black spark plugs and fuel consumption is so high....

martysmartie

iTrader: (1)

Get it setup!

Martin

midnight_man

What kind of setup?

costina

iTrader: (1)

So you have a couple of possible causes

Too much fuel pressure.
split diaphragm in fuel pressure reg causing fuel going into plenum on vac
Fuel return line restricted causing excess fuel pressure on the move.

Just a few ideas.

Glad your idle is sorted

midnight_man

Hi,

there is standard fuel pressure regulator. But I can Check real pressure (just for sure). There is no fuel in VAC (VAC from pressure regulator). About return line...thats good idea, I will check it.

Thanks

martysmartie

iTrader: (1)

A tune in other words, there are many different possibility's why it's doing that, which would show up on a RR session, for example.

Even if you did manage to find the cause and it appears to be resolved, it does not mean it's running correctly, i.e. it may be lean under load, hence you could end up with a meltdown! The fuelling on these is extremely important and not to be messed with without the proper equipment.

Martin

midnight_man

Hi,

problem with high idle is solved. I cleaned the ISCV and stretched the springs. Now cossie has 900rpm on hot engine


But I found that my cossie is firing to the exhaust at 5500rpm. When I press the gas pedal to the floor from idle, rpm stops on 5500 and engine starts firing...its very strange.

But When I will pushing gas pedaly up and down, I can get engine to 6000+ rpm ....at the end of rpm gauge....But It should stops me on 6250 or not?

Maybe wrong chip? Its L8 + pectel BB and standard RP lab maps.

Thanks a lot.