AE86 4age engine not starts crank ok backfires to air intake

[jondee86]

(08-14-2018 11:31 PM)Ryo Wrote:  We have done compression test on my friends AE86 4AGE and the
compressions are good.

What were the compression readings? And did you get that gauge
checked to make sure it was reading right?

Quote:My concers now is why the engine is so hard to start with smaller
capacity battery i need really fully charged good battery to start the
car than starting a few seconds (mine starts after 3sec or so but
mine friends i need to wait a while).

Have you checked the timing? Hard starting can be a lot of things...
cold start injector not working, AAV broken, (does it rev up to 1500-2000
rpm once it does start?), low compression etc.

Quote:Once the engine starts i need to keep it on gas or the engine stalls.
Also it feels like running on 3 cylinders as the car really shakes. It is heard
really noisy valves but when i keep it for a while in this condition and
engine gets warmer it just start running on all 4 cylinders without helping
it with hitting gas and the idle gets stable as well.

Sounds suspiciously like a leaking head gasket allowing coolant to leak
into one cylinder overnight. Does it start fine when the enine is warm?

Cheers... jondee86