CO level sierra cosworth 4x4

[sundera86]

i ve bought stage 3 chip from motorsport developments for 803 green and garrett t34.63. I put the chip but the iddle is not good, the engine have some vibration and i dont like how it works. How can i see what is CO level and how can i regulate it. On chip instructions write that the CO should be 2.5 - 2.7%. Could it possible CO level is the problem? Before the car was with PTS motoring chip and base iddle was better but after 4000rpm the fuel was too lean. please help me any suggestions except CO level?

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[oldford]

Find any garage that is capable of measuring the exhaust gasses.
Make sure the car is warm (cooling fans switched on twice) and connect gas analyzer.
Find the ecu and turn the screw next to the connector until you have the desired value.

Are there instructions on how much the fuel pressure must be?

[sundera86]

yes 3.5 bar without the pipe. i check the pressure and it is ok, i dont know where is co screw and what color is

[MARCOSWORTH]

CO screw

[English]

Be VERY careful with the screw too. It's delicate

[sundera86]

could the engine has vibration from rich CO?

[tabetha]

The engine can produce vibration from being too rich or too lean.
As said just use garage test machine to anylize gasses to adjust, make sure the fan is NOT on when actually doing the adjustments, especially if you have a group a cone filter, as the air blowing around will cause a noticebale effect on the reading, just wait till fan has gone off.
I don't know why they need to be as rich as msd set them, mine idles perfect at 0.97% CO on greys with modded head T34/3(different ecu).
When I had a msd chip, it worked perfect around 2.5%, and was a very good chip.
tabetha
tabetha

[MARCOSWORTH]

Is it a closed loop chip??

[sundera86]

no it is no closed loop chip. I dont know where is the problem, the engine work bad and from the exaust smeel gasoline. When a try to abjust down rpms from base iddle screw the engine start vibration below 1300 rpm
Any suggestions, please help m8

[sundera86]

one more question ? the only way to abjust down base iddle mixture is from CO screw? any other way to down the CO
When i start the engine from the exaust exit very strong air leak and smeel gasoline?

[tabetha]

Did you do any other work at the same time ?
tabetha

[sundera86]

Originally Posted by tabetha

Did you do any other work at the same time ?
tabetha

i cant understand you, what other work
what should be co screw position for stage 3 non closed loop chip, how many turns to left or to right?
Is it possible the problem start from very cold weather?

[tabetha]

When I say other work I mean any other changes apart from that needed for the new chip, were any other mods apart from chip mods done at the same time ?, if for example you did a belt change it's possible the phase could be out one notch for example.
It's entirely possible that you had a pre existing fault, that is only showing up now due to the different chip having slightly different characteristics.
It really needs to get a gas/emissions reading done to see where you are, and what it's like at the recommended setting.
tabetha

[sundera86]

is it possible the problem came from spark plugs. I am with
CHAMPION C59C

[The DIVA]

Originally Posted by sundera86

is it possible the problem came from spark plugs. I am with
CHAMPION C59C

C59C`s are very hard and dont like to idle for long periods of time, they are also prone to flooding on cold startup.....

Take out the plugs and clean them properly, also make sure they are completely dry of fuel( I use an airline)..... refit them and warm up the car and set the CO correctly on a machine.

[big mac]

i had this problem on msd chip running champion plugs changed to denso lk31 problem solved try a plug change mate

[sundera86]

engine vibrate very strong and work not quiet. I will try the spark plugs, but is it possible engine to vibrate from spark plugs

[sundera86]

i removed the spark plug and there is too many gasoline on them. they are very black and there is liquid on them

[The DIVA]

Originally Posted by sundera86

i removed the spark plug and there is too many gasoline on them. they are very black and there is liquid on them

Sounds like they have flooded, give them a clean and dry them as i said and it should start ok, get it warm and then set the co

[sundera86]

Originally Posted by The Diva

Sounds like they have flooded, give them a clean and dry them as i said and it should start ok, get it warm and then set the co

the fuel pressure without pipe is 3.8bar at iddle, it should be 3.5bar
Is this posible to be problem, only 0.3 bar difference on fuel pressure could be the problem that engine vibrate very

[JTECH James]

fuel pressure is critical with these,

[sundera86]

Originally Posted by James @ M Developments

fuel pressure is critical with these,

what should i do to fix the problem, is it possible the engine was broben yet

[JTECH James]

adjust it lol

[tabetha]

From experience I have always found when plugs haev been soaked in fuel for whatever reason they never work correctly afterwards.
Personally I would go as said with IK, but 27's, these resist fouling that much better as run slightly hotter than the 31's, both available from msd.
tabetha

[tabetha]

Originally Posted by sundera86

what should i do to fix the problem, is it possible the engine was broben yet

As said adjust it, it will have done no damage, apart from maybe knackering the plugs.
Just turn the allen screw inside the fuel pressure regulator, this may still be covered with a little tamper proof plug on the top, just pierce this and take it out, then dig out hard sealant stuff underneath to expose the adjuster screw.
tabetha

[sundera86]

Originally Posted by tabetha

As said adjust it, it will have done no damage, apart from maybe knackering the plugs.
Just turn the allen screw inside the fuel pressure regulator, this may still be covered with a little tamper proof plug on the top, just pierce this and take it out, then dig out hard sealant stuff underneath to expose the adjuster screw.
tabetha

thank you for help m8, i abjust pressure at 3.5 bar without pipe and a little bit before 3bar with pipe on. The engine warm to operating temp and work much better, there is very small vibrations. i set base iddle at 1000rpm.
i dont like base iddle at 900rpm

[sundera86]

Originally Posted by tabetha

As said adjust it, it will have done no damage, apart from maybe knackering the plugs.
Just turn the allen screw inside the fuel pressure regulator, this may still be covered with a little tamper proof plug on the top, just pierce this and take it out, then dig out hard sealant stuff underneath to expose the adjuster screw.
tabetha

is it possible engine to vibrate from spark plugs or from coolant temp sensor. Fuel pressure is ok now but the engine vibrate and i dont like how it work

[Stu @ M Developments]

We have been through all this on email, until you follow the instructions that came with your chip and set the plugs gaps, CO and base idle to how we want it, you cannot expect it all to work properly. You MUST get the CO set mate.

[sundera86]

ok stu , in the chip instruction writte to set agps 071C. I will buy this spark plugs and replace champion qc59c. I hope to fix the problem with spark plug change