[Mk2] [Turbo] Oxygen/fuel mix must be wrong?

[turbo_87]

Can anyone explain this for me?

My car will not start with the standard factory fit bung on the back on inlet mani on, but it will start with it off and then run like crap. The bung is the one next to the a/c idle up pipe.


So im guessing my car is using the pipe to take in oxygen and when its bunged its chocking itself and not starting.

Why would my car be doing this??

My setup is as follows, Rev 3 turbo engine, st205 CC, bigger turbo, 800cc injectors and pfc running a base map (yes the injectors have been adjusted for their size)

[ForMySin]

Is the car throwing up any error codes?

[Steve Horrocks]

Was the car running fine before fitting the new gear? What setting have you got in for the injectors? Stock FPR?

[Neil_87]

53.75 and 0.20 for the latency is what the injectors are set for.

I cant check for error codes because i have a pfc plugged in and cant use my standard ecu because of the bigger injectors.

Stock fpr yes

The whole setup was taken from another mr2 being broken and put into my car which was previously running....

[Steve Horrocks]

53.75?? Shouldn't it be around 67.5??

Stock injector / new injector x 100 to use percentage. 540/800*100=67.5

So if anything, running too lean?

[Neil_87]

stock injectors are 430cc aren't they? well so the information i found on google led me to believe anyway. I will change them now to the correct setting.

That wouldnt cause the problems i am having though would it? Wouldnt that throw the knock detection up on the hand commander as well?

[Steve Horrocks]

Stock rev1/2 are 440 iirc (or at least 4something) you said rev3 engine, they are 540's stock. Running lean will cause knock/detonation, but if you're not running, it'll probably be picking up noise. What knock readings are you getting?

[Neil_87]

Not picking up any knock on the hand commander, but when the engine starts to hunt i have been turning it off because something really isnt right and i didnt want to cause any damage.

No improvment with the settings changed to what the should be using 540 as previous injector size.

[Steve Horrocks]

Ah, with you.
Right, best starting from beginning. When was it last working, and what has changed since then? Or has it all been stripped & fitted with new stuff in one go? Have you changed timing belt, moved/changed dizzy, changes leads etc?

[Neil_87]

It was last working about 6 months ago, was removed from a mk1 mr2 and then sat in may garage for a few months, then put into mine about a month ago.

Nothing on the engine was changed apart from a new engine loom needed fitting because the loom was previously for the mk1 chassis.

No servicing was done because the engine has only done about 3k.

So really it should of just been a case of plug and play.... but that would be too easy.

One problem it has is the tps sensor is slightly out, I tested it as per the repair manual instructions, feeler gauge and then testing for resistance.

It is slightly out, but i cant adjust it because one of the screws is knackered. Apart from that though should be fine....

[turbo_87]

Well some good news, i took the throttle body off, cleaned it, blew air through all passages and sorted out the tps sensor into its correct position and something i have done appears to of fixed it.

Got the car idling reasonabley well and did the learning process for the pfc, not that i have anything to turn on apart from a heated rear window and the heaters.

Do these readings from the pfc monitor look ok to you guys....?

Injector Duty - 1.8% fluctuating slightly
Ignition Timing - 3-12 degrees fluctuating
Pim Volt 1035mV fluctuating slightly
Revs - 792-801 rpm ... was saying just over 1000 rpm on speedo
Boost - 339 to -341
Knock - the bar was just a tiny line but it did flicker off the bottom once or twice
water temp - 100oC by the end....

These were taken while idling... after about 10-30 mins

[jimGTS]

100C is way to high for water temp

ive never seen anything over 85C

[Steve Horrocks]

100C is way to high for water temp

ive never seen anything over 85C

Agreed^^^ 85-87c.

[raptor95GTS]

doesn't the thermostat start opening at 80odd degC?

[Mike N]

My setup is as follows, Rev 3 turbo engine, st205 CC, bigger turbo, 800cc injectors and pfc running a base map (yes the injectors have been adjusted for their size)[/quote]


Is it a rev 3 car, ie do you have the speed density sensor fitted or the fuel rail cold start injector? I ask as I had to get the mod done to run the rev 3 pfc.

[Mike N]

Is it a rev 3 car, ie do you have the speed density sensor fitted or the fuel rail cold start injector? I ask as I had to get the mod done to run the rev 3 pfc.

[Neil_87]

So apart from the water temp the figures i posted look ok? In regards to that i think its get a incorrect reading because the temp gauge was just below half at the time. It had reached 70 degrees after about 5 mins of being on so i doubt it's right.

Mike - The car is not a rev 3, it's a mk2 rev 1 chassis with the rev 3 engine in. How can i check for this sensor, i don't know if i have it or not.....

[jimGTS]

Is it a rev 3 car, ie do you have the speed density sensor fitted or the fuel rail cold start injector? I ask as I had to get the mod done to run the rev 3 pfc.

i dout he would be able to start the car without the rev3 "MAP" sensor...so wold asume he has that already.
also rev3+ dont have and dont need a cold start injector.....

[turbo_87]

Yes i definately do have a rev 3 map sensor.