1987 Toyota 4Runner engine starts but then dies

Tiny
WILL B
  • MEMBER
  • 1987 TOYOTA 4RUNNER
  • 4 CYL
  • 4WD
  • MANUAL
  • 170,000 MILES
I have a 87 toyota 4 runner it was running great, the I parked it for awhile and went to go to store and it started and just died. I checked and it seems to get spark even when it won't start, so Ive changed fuel pump, fuel filter, fuel pressure regulator, and checked timing and it still does same thing. If I take the mass air sensor and stick a screw driver in it to open all the way up it runs, but it runs terrible. Any ideas?
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Friday, January 11th, 2008 AT 1:43 PM

7 Replies

Tiny
RASMATAZ
  • MEMBER
Find the check connector jump the Fp to Batt on it -do you hear the fuel pump if so attempt to start.

The MAF sensor grounds the circuit opening relay Fc contact from there it powers the fuel pump.

Bench test the MAF using the repair manual-

I'll be here waiting
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Friday, January 11th, 2008 AT 5:26 PM
Tiny
WILL B
  • MEMBER
I have two different manuals neither tells me how to bench test my maf, how do I test it Thanks will
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Friday, January 11th, 2008 AT 7:15 PM
Tiny
RASMATAZ
  • MEMBER
Did you jump the Fp to Batt. In the diagnostic check connector this will power the fuel pump.

If I take the mass air sensor and stick a screw driver in it to open all the way up it runs, but it runs terrible

What you are doing is powering up the fuel pump at the same time there's a lot of incoming airflow that the computer is confuse is to adjust for fuel. By doing so tells me somthing is wrong with MAF sensor and also in the book it doesn't say anything on testing it.

Your sensor type is the Vane Airflow sensor

Try this have helper listen to the fuel pump then turn the ignitn On-now push the MAF flap wide open -do you hear the pump come on.
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Saturday, January 12th, 2008 AT 12:05 AM
Tiny
WILL B
  • MEMBER
Well I jumped the fuel pump and it still don't stay running, when you open the air meter the fuel pump runs, but after messing with it today it was idling but rough then when you give it gas it dies, but if you really slowly give more gas it idles up but don't run very well. I also jumped over the diagnostic port and it came up with code 11, says tps or cpu, don't remember if I ever checked codes before its been a long time since I first worked on it, woud a throttle position sensor make it not won't to stay running?
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Sunday, January 13th, 2008 AT 6:50 PM
Tiny
RASMATAZ
  • MEMBER
Now we're getting somewhere-The TPS and IACV will do that-check it and report back-am waiting
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Sunday, January 13th, 2008 AT 6:54 PM
Tiny
WILL B
  • MEMBER
Sorry haven't got back to ya, only work on it once in awhile, put new tps switch in, and now its got no codes coming up, but still does the same thing, were now? Maybe its the ecu? Watched a show about baja 1000, they had a newer toyota on the trail, that started doing the same thing and it ended up being some wiring on masf, could I be looking at wiring if so were do you start?
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Tuesday, January 29th, 2008 AT 5:22 PM
Tiny
RASMATAZ
  • MEMBER
Find the EGR open it up and look for carboned-up pintle and inspect its passages.

At the airflow meter you can disconnect it and also at the computer harness check wire to wire and wire shorted to another wire going to the airflow meter.
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Tuesday, January 29th, 2008 AT 9:58 PM

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