strange problem with my 4efte

A

allpr0h

Member +
hi folks

im running at 13psi on a td04l using an external wastegate, tuning with an safc-II it was working PERFECTLY, i was on boost all the time :cool:

ok now, lately, the car started to (what i think is..) fuel cut at around 11-12psi (i have a digital meter for pressure)
when it reaches around 3800rpm or so, when boost should kick on and wastegate open, the car starts to kick and sound like rprprrrprprprprprrprprp and wont accelerate anymore... this is very annoying to me and im out of ideas
i am waiting for a walbro 255 fuel pump as im using the stock tercel fuel pump and running 440cc injectors... i thought maybe the pump is getting tired or simething.... i have checked the wastegate it looks very clean, diaphgram is not punctured and there is no leak at the connector
i have changed the hose the the MAP sensor and the one to the wastegate with no effect


now i have tried plugging an hks FCD (FST-19253) but the device is not letting the original voltage through.... any clues about this? it will adjust from about 3.5v up to 5.11 but i will never see the MAP sensor voltage
i read 2.6volts engine turned off at the MAP signal to the ecu, i take that wire and plug it in the FCD white one, i measure the voltage at the yellow wire from the FCD and it reads 3.5v (setting at 1 or something like that)
i have tried with no success to read 2.6v at the FCD output wire.... i thought it was a simple clamp letting all voltage through except will keep output at 5volts (lets stay) if it would be 6volts normally (for example)
is it possible i dont have the right FCD for an ep82???

any help would be greatly appreciated... i miss my car ;[[[

thanks
nate
 
A

allpr0h

Member +
could someone just confirm to me that, normally, i should read the map sensor signal at the yellow (output) wire of the FCD?
like in example;

if FCD is set at 4volts:
when MAP outputs 2volts, i should read 2volts at yellow wire (output) of the FCD
when MAP outputs 3volts, i should read 3volts at yellow wire (output) of the FCD
when MAP outputs 5volts, i should read 4volts at yellow wire (output) of the FCD

so that i know this crap is busted out of the box, stop giving myself headaches, and never buy this piece of :mad: again, find myself a JAM..
 
R

Rev

Member +
I thought with those injectors your sacfc2 voltage alone would be below fuel cut.
What percentage fuel are you removing at 3500rpm and 4000 rpm ? Did you set both maps hi and low?
Sounds like a sudden change so would suggest a quick check of map wiring and map vaccum lines.
 
HKS111

HKS111

Member +
Looks like an ignition problem.

Things you can try changing:

Plugs,
Plug leads,
Distributor cap,
Rotor Arm,
Igniter,
Coil pack.

Obviously try one at a time.
 
A

allpr0h

Member +
here is my safc-II program

HIGH THROTTLE;

800rpm = -50%
1000rpm = -50%
2000rpm = -35%
2600rpm = -20%
3000rpm = -18%
3600rpm = -18%
4000rpm = -18%
4600rpm = -18%
5200rpm = -23%
5800rpm = -24%
6400rpm = -27%
7000rpm = -27%

____________________________________


LOW THROTTLE;

800rpm = -42%
1000rpm = -29%
2000rpm = -22%
2600rpm = -28%
3000rpm = -22%
3600rpm = -20%
4000rpm = -22%
4600rpm = -24%
5200rpm = -30%
5800rpm = -30%
6400rpm = -34%
7000rpm = -36%

______________________________________

Ne Point;

Ne 01 = 800rpm
Ne 02 = 1000rpm
Ne 03 = 2000rpm
Ne 04 = 2600rpm
Ne 05 = 3000rpm
Ne 06 = 3600rpm
Ne 07 = 4000rpm
Ne 08 = 4600rpm
Ne 09 = 5200rpm
Ne 10 = 5800rpm
Ne 11 = 6400rpm
Ne 12 = 7000rpm
_______________________________________


but like i said, it was working very nicely all summer long it has just started to happen about a month ago.... i changed the hoses to the MAP and to the WASTEGATE
and i conclude there is no vacuum leaks as i can read -25 inch of mercury on the vacuum gauge, so i believe there is no leak there

i have new leads, new plugs, i cleaned cap and rotor with sand paper and i have put dielectric grease on the contacts
im pretty much out of idea... my guess would be to plug a fuel cut defencer and get rid of this situation but as i said mine i think is busted....

i should read the MAP sensor signal at the output of the FCD wire, no?
if i cant read the MAP sensor signal at the output of the FCD wire, i presume my FCD is busted... right:(
 
R

Rev

Member +
Ok 3 suggestions from the first part above , fcd questions I leave to others -

1 Dont use Dielectric grease on anything conductive. Dielectric grease is a non-conductive, silicone-based grease that's designed to seal out moisture and prevent corrosion on electrical connectors. It also disrupts the flow of electrical current, which makes it good for lubricating and sealing the rubber parts of electrical connectors .

2 Check your HL change point if you are in H map only above 3600 I would say with Map could be hitting fuel cut. Which occurs around 17% fuel removal with 4.15v fuel cut ecu . Even though you were at -18% the map scale ,map , dirt in map tube TB entry ,temps etc and safc rounding volts differently may put you at fuel cut with 18%. If afr permits safley you could try -19% and see if that fixes the fuel cut?

3 Colder weather may have sparks blowing out especially if they are weak due to gap type or weak spark caused by 1 above.
 
Last edited:
A

allpr0h

Member +
ok

thanks for the info, its very useful for me to know that the fuel cut is triggered at 4.15v
i will try changing -18% to -19 or -20 just for testing
im looking for a wideband... right now i only have an exhaust temperature sensor
imma make sure its not heating tho, but ill definitively wait the wideband to start playing much with the safc settings

thanks again
and if you got infos about the FCD that would be great... HKS is same as JAM i only have been unlucky getting a defective one ? ..
 
R

Rev

Member +
I have been doing a bit of research on fuel cut trying to understand my ecu better. Not finished yet but two consistant fuel cuts being posted are 4.15 v and 4.5v relating to > 10110 ecu 4.15v and 10100 ecu 4.5v respectively.
 
Last edited:
A

allpr0h

Member +
ahoy

just to let you know i got it sorted out so far
i have changed spark plugs for new iridium range 7
replaced the coil wire the old one was like a crispy crunch.. im using a 5mm camry 5sfe coil wire im not sure how long it will last... whatever
i have installed an in line fuel filter before the map sensor
cleaned the cap/rotor and changed the T in the vacuum lines which was looking a bit cracked..

code 31 is gone i drove it a bit last night reading -5 degree C air temperature and it boosted fine
thanks for all help

nate
 
You must log in or register to reply here.
Top