4age issues

[RB MAN]

hi all,
just need some help with my aw11 mr2 na I just bought took me ages to find one but now it has a problem and struggling to figure out why being a mechanic and also my best mate still can't diagnose , still working on it but will post on here anyways

in first gear when I go it like surges then check engine light comes on and then keeps going!
come to a stop and she stalls sometime
fuel pump changed and filter, coil and distributor changed

anybody hav any ideas

thanks all :)

[Risk10k]

Head gasket? Any kind of pinging under high load low rpm?

[RB MAN]

can't see any signs like through oil, COolant ? doesn't miss a beat just feels like it's starving when I take off

[daedalusjc]

what model 4age? bigport, smallport, 20 valve etc. AFM or map? AW11's were a bigport 86kw with TVIS werent they? if you can get exacts on engine i might be able to help. spent heaps of time playing with 4a's. have you jumped TE1 and E1 to see what diagnostic code it is?

[RB MAN]

ok it's 4age, umm dunno if it's small or big port? , 16 valve, map sensor , has tvis
I'm not clue on Toyota just Nissan lol

[daedalusjc]

map sensor and model i'd assume bigport redtop. ok so in the engine bay you've got a diagnostic connector. fairly standard toyota pre obd setup. get a wire jumper and with the key off link the terminals TE1 and E1. turn key to on position and engine light will flash a series of codes. so for example 5 short flashes then long delay then 2 short flashes is error code of 52. possible causes for issue your having could be bad map sensor signal (check vacuum hoses), bad oxy sensor signal or more commonly bad coolant temp sensor. but hard to pin point without knowing the diag code

[kurbn]

I would be pointing towards the AFM, TVIS is only on the big ports

not much that goes wrong on a GE.. do what daedausjc said and count the flashes

this will help you :)
http://www.challoner.com/mr2/tech/diagnostics.html

[daedalusjc]

yeah i first thought afm but its a map sensored engine. afm's were the yank delivered engine and i think the japs ran map in speed density. i had bulk issues in my 20 valve and aftermarket ecu missing over 9500 rpm all because of a tiny bump on the trigger wheel. bloody touchy but bullet proof engines

[Sack]

It has obviously been converted to MAP sensor as AW11's were the first gen GE/GZE's and came out with an AFM, they were also AFM from Japan. MAP's came out in the AE92's and it's common for converting the AFM and dizzy to MAP and CAS!
Have you checked all your vacuum lines as it sounds like you may have a leak? Does it idle fine?

[kurbn]

do this as well

Put a hose clamp or multigrips on the fuel return line to reduce the fuel return so you can up the pressure in the rail..

sometimes when injectors get blocked they can stutter or bog down the car on take off