Jollyradar

OK swapped a 1992 4runner 3vze engine out and replaced with a 1988 p/u 3vz.

When starting it turns over and then releases a vaccum out of the TB and wil not start. any ideas on what to check first?


Thanks

thefallman

did you swap the harnesses??

Jollyradar

No didnt need to swap harnesses...kept the sensors off the 92 3vze. all the connections are plugged in.

Thanks

Pozi

Spark / Fuel / Air

Check those in that order.

mastacox

^^That^^ and then timing...

Jollyradar

ok got it started (i was missing a small ring gasket on the fuel rail, lost fuel pressure) ok anyway now it runs for like 3 seconds and stalls still the same vaccum sound from the TB. any ideas besides going through every vaccum connection?

Thanks guys

mastacox

Fuel pump maybe? How old is the gas? Do you try throttling it any while its running? It could be the idle speed to set too low or something like that...

Jollyradar

My bad should have clarified....

Turn the key fires right upto 1500rpm just in time to stall... th rpm needle falls as soon as it passes 1500rpm. Throttling it makes it a little worse. I dont think it has to do with fuel as much as vaccum loss somewhere....or something completely different.

Any help is appreciated

Thanks

FOCUSHERE

sounds like timing maybe
crank sensor?

toyaholic

sounds like deja vu. when i first cranked my rebuilt 22re i had the same problem. mine ended up being a bent contact inside of the afm. no clue how it happened, i was very gentle handling the unit. must have been gremlins. the computer was shutting down the engine because of a bad voltage value. i used the service manual to probe the computer for voltage and found the bad value for the afm. if you don't find anything obvious, try the trouble shooting in the efi section of the online service manual on here if you don't have one yourself.

superjoe83

sounds like its just running off of the cold start injector...

Jollyradar

im getting an engine code 14.... Igniter/coil... no signal to ecu. Ignition systems and circuitry are my weak points.

where do i start?

thefallman

if your useing the 88 harness with your 92 ecu

im prett damn sure that the harness arent the same

i know my 89 wasnt the same as a 90. as far as starting then dieing sounds like the signal from the afm isnt getting through or connected right

Jollyradar

You are correct the harnesses are not the same. However, if you were to keep all the sensors of the original engine thereby keeping all the connections the same, it works.

What is the afm?

thefallman

negative the connectors arent the same to the body harness and to the ecu

the pin outs are differnt

like i said even my 89 to 90 was differnt and thats same body style

Jollyradar

I kept all of the connectors. i changed all the sensors on the block, and used the plenum off the 92, so the connectors would match up.

toyaholic

what your saying is that the only thing that is different is the block and heads, everything else is original equipment. same computer, wiring harness, connectors and all sensors and plugs from the original block. makes sense to me. the vacum puff you are getting when the engine dies is the last bit of compression being pushed through the open valves, i think. just a guess on my part. if you want a good troubleshooting procedure, use the fsm like i said before. no matter what system you are dealing with the manual gives procedures to check everything. it saved my arse. i would have never found the bent pen in my air flow meter (box with the plug on top of the air cleaner box) if my manual didn't point to it and say bad or OUT OF ADJUSTMENT afm. i thought that they were sealed units that were just r and r.

95RunnerSR5

this happened to me...did you mess with the screw's on the AFM? i got the same codes and everything...i was sure it was the ignitor but it ended up bein the AFM...

Jollyradar

Hey guys thanks for all the help. Finally got it, (kicks self) AFM wire wasnt on tight...(kicks self again). Fired right up. But thanks for all the help guys really appreciate all of it.

FOCUSHERE

wwhat is AFM?