4afe Ignition timing Problem

[dani_kk]

It's good.

[pwuser167013775514]

Axel.inners are 100% ok... I replaced these 2 weeks ago

[dani_kk]

Spark leads are good?

[pwuser167013775514]

Yes they are also good .
Kindly one thing guide me.
Is pressure regulator is faulty ?
Because pressure is reduce from 37 psi to 25 psi when engine is off ...

In morning engine starts in half self but when i accelerate the engine it's vibrate during rev but after 10 mins vibration is completely gone during revs on neutral... when i driving a car then get single jerk on 3000 rpm

[dani_kk]

That drop of pressure is completely normal. It's not like that it will stay the same after switch off provided that in morning it fires right away. So rule out fuel pump and fuel pressure regulator.

[dani_kk]

Have you got the compression test done yet?

[pwuser167013775514]

Yes... It's about 150 psi across all cylinders

[Xulfiqar]

Lag of acceleration can be due to a lot of factors, like wrong injectors or bad tappet gaps.

Checking fuel trim on these isnt easy, as no scan tool shows it, but you decipher it with the DLC2 connector as it shows as correction voltage.

[pwuser167013775514]

@Xulfiqar Sir can you guide me about the distributor wiring please . I have a little doubt about its wiring ...
Distributor have total 8 wires with 2 grips
1) 2 wires
2) 6 wires ..

when i swap the engine distributor connected with the engine is one from 5afe one it have total 6 wires with 2 grips
1) 2 wire
2) 4 wire

ECU give error code about distributor So electrician change the distributor from 6 wire to 8 wire one now no error code about distributor...

Kindly guide me about the connection of 6 wire grip on ecu then i cross check its wiring may be distributor can cause lag of acceleration

[Xulfiqar]

The 8 wire distributor is the correct one for 4afe as it has a cam sensor (tdc1 sensor) built into it, 5afe dont use it

The wiring is pretty simple
6 wire plug is

2 wires to NE+ and NE- (crank sensor)
2 wires to G- and G+ or G1 (cam sensor)
1 wire to IGT (Ignition trigger)
1 wire to IGF Ignition feedback - this is toyota system of knowing igniter fired)

2 wire plug
1 wire is 12v+ from key
1 wire is rpm feed (thin one, it also ends is in dlc2 in engine room)

6 wire distributor is similar except it doesnt have G- and G+ wiring

Using the 5afe distributor will result in a bumpy lag on initial acceleration as the ecu needs it to time the injector sequence.

[pwuser167013775514]

@Xulfiqar can you tell me the location of cam sensor where it's installed... I checked the distributor wires, connection with ECU are Ok... G- and G1 pin connected.

Secondly i get i issue after changing throttle body..
On previous throttle body when i remove the race/chock sensor grip check light become ON but Now in new throttle body when i remove the grip Checklight remain OFF.

New chock sensor also work fine in cold start RPM jumps to 1100 and on normal temperature rpm is on 900

*** I changed the previous throttle body because it doesn't support 4 wire TP sensor ***

I also change the chock sensor because previous chock sensor doesn't support new throttle body because in previous throttle body where chock sensor install on motor pin. Motor pin rotate in 360 degree while new throttle body pin moves almost 45 to 60 degree.

Previous throttle body pics
TP sensor Part number = 88452-33030

Chock sensor Part Number =
22270-16090

New throttle body sensors
Chock sensor

TP sensor

[pwuser167013775514]

@Xulfiqar @dani_kk
Thank you so much for your time and guidance . I resolved the issue... Main culprit of jerks over 3000 rpm was Distributor G- and G1 wiring... Wires already connected on ECU on these pins but i replaced them with each other .
Means G- pin replaced with G1 wire and G1 pin with G- wire .
Now no jerks on over 3000 rpm

[Xulfiqar]

Oh lol

Your ecu was basically seeing an inverted cam signal. 🤣 - anyways, sorry for not replying earlier, I was not feeling my best.

[pwuser167013775514]

No issue Sir you guide me alot.

[pwuser167013775514]

@Xulfiqar kindly guide me for what purpose this vacuum switch is used for?
this switch is located on intake manifold but having no connection on it.
Part number = 90910-12143 Toyota

reference picture

[Xulfiqar]

This is the evaporative system purge solenoid, its whole setup is probably missing from your car altogether.

[pwuser167013775514]

yes your are right EVAP complete system is missing..
is it possibe to install complete system ?
what other parts i needed other than charcoal canister ?

and what are the Cons for nothing having this system ?

[Xulfiqar]

You will need a lot of parts including the fuel tank, the tubing, the canister. The venting valve, the fill neck etc

It was not even installed in the local pakistani corolla 1.6 which had this engine, it was for countries with very strict emmissions regulations (in such places raw spilled fuel or raw fuel vapours are strictly prohibited)

[pwuser167013775514]

then i think i should leave it as it is

[Xulfiqar]

Yes, I wouldnt bother