Hey guys,got a new project and having a few problems getting my bigport 4age to run properly in my ae86. MAP sensor'd

 

cars undrivable at the moment, if i give the throttle a real quick hit and bring it up to say 2500rpm it misses and backfires and carrys on, if i move the throttle slowly to 2500 not a problem at all

 

idles like crap (see vid)

 

 

What ive tried;

 

 

Have statically timed (everything lines up, cam timing etc)

 

timing is at 10BTDC with diagnose bridged (timing is pretty erratic, 10degrees for 2-3 seconds then jumps to 15 then back to 10 etc etc..)

 

compression check 140-145 on all 4 cylinders

 

checked vac hoses

 

TPS adjusted and in range

 

Cleaned iscv/throttle body new gaskets everywhere

new dizzy cap

new plugs

new leads

all sparkplugs are sparking

 

 

Any ideas?

Edited August 14, 201511 yr by smackdownz

brandnew plugs ran for 5mins

 

SPARKPLUG CYLINDER ONE

 

 

SPARKPLUG CYLINDER 2,3 &4

 

 

also a video of how its idling, it will idle like this and eventually stall out on its own....

 

http://vid735.photobucket.com/albums/ww360/smackdownz/20150814_171541_zpsv8k6rr3x.mp4

Edited August 14, 201511 yr by smackdownz

Get the 4AGE diagnostic manual off the net, or send me a PM with your email address and I can send you a copy. Its 6Meg so I can't post it here.

 

 

It is the proper Toyota manual for their agent's workshops. Work your way through and sort out why #1 is not firing, or overfuelling.

 

Do you get any error codes?

 

 

 

(Don't thank me, thank Parrot, who gave it to me!)

Yeah diagnostic codes would be good.

 

You can download it yourself here

 

http://www.aeu86.org/technical/ae86-manuals/

 

 

Has the engine been sitting a longtime? Injectors may need a good clean. And what colour are they?

Edited August 14, 201511 yr by parrot

Looks like number 1 injector isnt squirting properly. Swap them around and see of your nasty spark plug changes cylinders. Then if you can tell an injector is no good get the 4 of then cleaned.

Sorry for the late reply, have been busy at work.

 

Took injecters out and cleaned. cleaned plugs and no more black plug on cylinder one so that problem is fixed. altho seems to have not helped it running like crap still. I'm seriously at a loss to what it is...

 

also set idle again and tried another TPS but hasnt changed a thing still the exact problem i was having before, misses, idles crap, no power etc..

 

went thru the book and did all the tests to check coil/ignitor etc etc etc all in spec

 

any idea where to go now?

Edited August 21, 201511 yr by smackdownz

So have you run a diagnostic?

 

Try unplugging the tps and the map sensor and see if there is a change. (One at a time).

 

My friend had a similar issue, all the hoses to the map sensor were fine but the metal lines were clogged.

No error codes at all, just flashes showing no code...

 

Which metal lines are yoy talking about mate? Ive blown thru all my fuel lines and they are clean.

 

Unpluging tps seems to make it worse?

Havent tried map sensor, shal do

I suspect your idle circuit in the TPS is out. You cannot set ignition timing until your idle circuit in the TPS is closed, as the ECU will not go into diagnostic mode (regardless of whether the diagnostic light is flashing or not). The timing will jump around everywhere and just generally be way out.

How do i go about checking this, have followed the book the test the tps and all in spec. The car seems to want to run a lot better with timing say at 30is(unbridged) doesnt ping or anything just seems happier up there? But obviously somethings wrong. (yes cam timing and everything else is 100% correct)

hey guys , need some expert help , recently done a 4age smallport swap on my ae92 , the engines cranks up and runs but the problem i am facing is when i rev the engine it does not rev up (what i am trying to say is when i start the engine it starts fine but when i try to rev the engine it dies) . the map sensor is fine, the TPS is fine, fuel pump pressure is fine, fuel rail pressure is fine, injectors are working fine , need help can't figure out what the prb. is

Edited December 21, 201510 yr by ali123

Engine/ cam timing is good?

yes i have checked the cam timing its fine

You have a whole series of suggestions above, follow those. When you say the various sensors etc are fine, how have you actually tested these?

 

More info is needed about how you have done your swap. Have you done a diagnostics and so on