Luigi Noschese

Hello everyone


Can someone explain me how the re-injection works on ESL.
On my 95 GT The reinjection is set to 950 rpm when engine fully warmed up.
If i look onto my AFR guage i can clearly see when the injectors are cut off, 22.4 on the gauge.
If it is set to 950 rpm, does it mean that the injectors are cut off until the 950 rpm is reached, and starts reinjecting?
If this is the case than i have a problem.
sometimes there is no cut off at all from 3000 rpm , or it starts reinjecting at 2000rpm in stead of 950, or it starts reinjecting at 1500rpm in stead of 950.
It never re-injects at the set value in the ECU, 950 rpm.
Most of the time when i blip the throttle rappidly, the cut off kicks in, but that only happens between 3000rpm, and down.


grt


Luigi

ossett2k2

iTrader: (9)

Maybe a faulty TPS? Or a faulty CTS? Have you logged coolant temp(LUT) to see if things are as they should be?
I had a similar problem,I thought it was the TPS as my lower(throttle off) was reading around 25,I adjusted it to 8 but it was just the same.
Turns out it must have been the cracked piston

Hope it's something simple for you mate.

Luigi Noschese

How did you find out it was a cracked piston?
Compression test or leakage test?

ossett2k2

iTrader: (9)

No,compression test came back ok,not even sure a leak down test would have shown? I heard a knock,didn't sound like it had spun a bearing,sounded more valve train related.
Piston skirt failure,only knew when the forged cosworth piston exploded,the other Pistons had fracture lines in the same place.

Luigi Noschese

Last week i found out that the TPS on a MY95 gt has an idle switch.
so i measured and found out that it had 5 volts with the throttle plate closed when it should be 0 volt.
After setting it to the correct voltage i assumed i also cured the re-injection thingie.


But what has a cracked piston to do with injector cutt-off and re-injection?

ossett2k2

iTrader: (9)

I'm not sure what it had to do with the cracked piston to be honest?
I do know when I fitted the donor shortblock that the problem disappeared and runs fine now. Apart from swapping the short block I cleaned,lapped and re-shimmed the heads(tight clearances) it could have been the heads/valves that were the problem? a leak down would have shown any problems there but I never had chance to do one.

My problem was when I was coasting in gear,throttle off It felt like the car was intermittently throwing fuel in between 4k and 1.5k(my reinjection setting).
Was chasing the Tps as logs showed when this was happening my tp was jumping from 8 to 10.

Luigi Noschese

I didnt do a ecu reset after i changed and adjusted the throttle pot, gonna do that first.

Luigi Noschese

I checked the reinjection table and coolanttempLUT and can confirm that nothing is wrong with that.
TPS sits at 8%, this is the lowest i can go, otherwise the idle switch is not working.
To rule the ECU out i inserted the esl board in a spare one i have.
This did not cure the re-injection that is kicking in to soon.
it has to be engine related, but i am out of ideas.


Anyone?

ossett2k2

iTrader: (9)

Not sure this will cure your problem but shouldn't the voltage read just under 5v when throttle plate is closed?

Luigi Noschese

I used the above to check TPS

Luigi Noschese

according to the pinout diagram idleswitch off should be 5V, on should be 0V.
The TPS on a MY95 has an idle switch and the throttle postition pot.
the pot should read 4.9v closed, 0.9V open.

ossett2k2

iTrader: (9)

Correct,but you say in post #5 you was reading 5v with it closed and you adjusted it to 0v.

Luigi Noschese

damn im confused now, gonna double check it.
Could be a typo....