Hey I have a 1993 4runner SR5 V6 and it won't stay running unless key is held in start position, can anybody help me wit this problem

 

Did you try replacing the ignition cylinder? Could just be worn out and they are about 30-50 bucks at a parts store.

 

FSM ignition switch

 

Does it stop immediately when you let go of the key, or run for a second or two and quit? If the latter, I would suspect a problem in the VAF/COR circuit.

You can start replacing parts willy-nilly (ignition switch cylinder? I assume DannySea means the switch itself; the cylinder is the part into which the key fits) and you might get lucky. Eventually. Or you can try to diagnose the problem.

I'd start with a multimeter on the ignition coil to see if you get 12v with the key "ON." If not, work back to the switch and check that. Don't have a multimeter? No excuse for that! http://www.harborfreight.com/7-funct...ter-98025.html

 

It runs for a moment then dies

 

So I found out that someone had put an automatic motor and wiring harness and ECU but it a Manuel transmission would that be an issue

 

How recent did they switch the wiring harness. Were you driving it and all of a sudden it started acting up or did you just buy this runner

 

Just bought it

 

I'd still start with a multimeter to be sure you're getting power to the ignition coil; if no power there, you need to trace back to the switch.

Another possibility is a problem in the VAF-COR circuit, so that the fuel pump shuts off as soon as you switch from START back to ON. You can diagnose this by jumpering fp to b+ in the diagnostic connector. If it runs then, you've found your problem.

DO NOT LEAVE THE JUMPER IN as a long term solution. You may die a horrible, fiery, death.

 

Checking those right now kinda goin through the manual but hey if you might kno the continuity readings for the COR I might be able to omit the relay

 

A loose connection on the VAFM will do that to, bad connection or a bad VAFM.

When I replaced timing belt did not seat connector to VAFM (broken connector by me), it would start and then die. At least it was easy fix.

If flapper door does not move the fuel relay will not be active. Check manual, inspect and measure.

Try jumping for code reading, does it run. Do the fuel pump trip.

Bad ignition key was the problem on my Chev truck. It would start and die when I let the key go and reset.

Hans

 

Tested the VAFM all readings checked out with manual realized I got a whole parts vehicle at home the engine codes matched up changing out everything on that circuit if not fixed then on to the harnesses

 

Well she's running good now, ended up just being the VAFM now she purs like a kitten thanks for all the help