Smallport 100kw 4age AE82 Hesitating

[Cuzzo]

Hey peoples,

I have tried to diagnose this myself with replacing all the things i could think of causing this.

My 4age smallport hestitates sometimes around 3-4k then other times 5-6k. Not consistant.

Its using standard ecu.

Ive replaced:

* Spark plugs
* rotor and cap
* injectors been cleaned
* fuel filter.


The leads look in good condition but how do i check the resistance of them?

Any suggestions?

[4agte]

sounds like a lead

[30psi 4agte]

Check resistance by using a multi meter on ohms setting. Place one end of the multi meter on one side of the lead and the other end on the opposite side of the lead. This will give you a reading across the lead.

You want a reading closest to 0

[eviltwin]

i have a somewhat similar issue but the car is hesitating under low revs, i replaced plugs , fuel filter etc and it's got me beat , some people say the map sensor needs to be replaced, any idea would be great!

[Cuzzo]

I changed the leads its a bit better but not 100% good.

Next thing i will be changing is going to be the map sensor and cold start injector. Prob get one from the wreckers and see if it makes a difference.

Im also having issues starting it too. Takes about 3 seconds cranking then give it a boot full untill it idles.

[eviltwin]

I changed the leads its a bit better but not 100% good.

Next thing i will be changing is going to be the map sensor and cold start injector. Prob get one from the wreckers and see if it makes a difference.

Im also having issues starting it too. Takes about 3 seconds cranking then give it a boot full untill it idles.

my car does this identically on start up , requieres accelerator otherwise it's very hard to start, whats a map sensor worth?

[Cuzzo]

im not sure but its sooo small, fits neatly in your pocket. New one, no idea.

Pick n payless dont have one atm. No 4ages there atm

[eviltwin]

yeah theres only a handfull of 4AGE powered cars where i live so it's going to be hard to source locally

[Cuzzo]

Its so weird. I wasnt doing the hard starting before i changed fuel filter or injectors, but when replaced with new it started doing it.
WTF!?

Did yours start to do it after you changed the filter?

[eviltwin]

yeah dude , the day after , she ran like gold for 24 hours then had kids, i was like WTF i spend money on you and you do this lol

[Cuzzo]

WTF!!!! I got a toyota genuine filter, did you?

Maybe they are the problem? Stuffed too full of filter and cant pump the fuel through on start up?

[eviltwin]

mines just a repco one , im checking for vac leaks etc etc might reset the ECU aswell

[Cuzzo]

yeah i reset the ecu and it runs a little better. But its still there a tiny bit. This is making the conversion look like a better plan.

[eviltwin]

ahh fair enough , ill reset mine and check everything else and tell you how i go!

[eviltwin]

ok it's running better than ever currently, i reset the ECU unplugged and replugged everything under the bay wire related etc and bolted a few earths in , also check all the fuses in the bay are seated correctly as my EFI one was slightly out

[Grega]

check your grounds are nice and clean
esp the one that goes from the head to the body (drivers side)
that gave me no end of dramas - until i figured it out that it was loose.

[Vios-GT_07]

hm.. i've got this problem now..

and i've given up trying to diagnose it.. any other suggestions?

it sputters a bit between 2000 rpms to 3000 rpms (depending on throttle and load)

and again between 4000 and 5000 rpms (depending on throttle and load)..

might get the ignitors and coils bench tested once i can find someone.. the guy selling them here isn't answering his PMs and post.. also occassionally it's redline is less than 7800 rpms.. (more like 6800 rpms)..

[Cuzzo]

Yes it is extremly gay!

I cleaned the contact of the efi main fuse and some of these other things in the fuse box in the engine bay. Helped a little. Try reseting you ecu.(battery off for a little while)

I still have no idea how to fix it. I might even take out the cold start injector and plate it, to see if thats leaking.

[Vios-GT_07]

after half an hour of "testing" i've discovered the following

that stutter occurs between 2000 and 3000 rpms, throttle and load seems to affect it.. doesn't matter if it's revving up or slowing down.. minimal throttle and it seems to be non existant.. full throttle and it seems fine..

will try the ECU thing now.. updates tonight...

[Cuzzo]

Its still fkn doing it!! GRR!!!