Harold Of The Rocks

Hey guys, I've replaced the fuel pump, fuel filter, and double checked all the fuses. The 4runner (1989 22re A/T) still can't start. How demoralizing. Changed the big BIG PITA fuel filter and still nothing. Ugh, what a job. Anyway, any thoughts on what else I can start troubleshooting?
Harold

scuba

Im guessing you've narrowed it down to fuel..

Could be a few things..
EFI relay, CO relay, wiring between COR and afm, Afm

http://personal.utulsa.edu/~nathan-b...sm/engine.html
3RD group down is EFI junk.

That should give you a start..

scuba

In this, do what it shows in the first picture with a paper clip..
http://personal.utulsa.edu/~nathan-b...38circuito.pdf

Im sure you know where the diagnostics box is..


if it runs then id say its your COR, Which theres another test for that but I cand seem to find it right now..

Supprisingly enough I have a COR for sale

Harold Of The Rocks

Thanks scuba. Yes, I've tried jumpering the Fp to B+ at the diagnostic box. The paper clip get hots so I guess there is juice going through it. Funny I still can't hear the hiss that I thought I would if the fuel pump was being energized. I've come across the link you forwarded, and I'll try to make some sense of it. I don't think it is the EFI as I can start it for a quick second, then dies. It's like it gets a big glup of gas and then nothing.

scuba

I havent dealt with an issue like this for a little while so im trying

Ok, So as far as I know, theres a sequence when you start it and the ecm takes a reading from the afm and if its right it will go through the COR keep the fuel pump going and keep the truck running.
So im lead to believe its either a problem with the afm or the cor..

Also, When you did the FP, did you disco the lines that arent hardwired?
If you did you might have hooked them up backwards..

I know you say youve checked fuses but did you replace the EFI relay..?

Like I said, Trying my best here, Maybe 4crawler can chime in..

Marc

You should open a fuel line after the fuel pump to see if it's actually pumping.
It might be ok.

I have two 4runners and have never heard the fuel pumps run.

scuba

Here's a few words from a friend of mine.


Hope that helps some

Sin91

/me giggles. You know I talk to abe.

scuba

Can I have some coldstone ?

Sin91

only if you're buying
and cheesecake with cherries

Harold Of The Rocks

It sure does. I haven't replaced the EFI relay fuse. That's another 30 bones I didn't want to part with. But, I'll give it a shot. I think though, given what you quoted, is that I should test the power at the fuel pump. You quote your friend who said that when jumpering the Fp to B+ the paper clip is hot which means the fuel pump is drawing voltage....sooo, with a new pump i'm taking a guess that it could be the continuity to ground. That's was I'll look into next. Not sure though, is the ground from the pump? or from some other area? Also, it could be a wiring shorting out, but I'd have no idea where to look for that. Also, I have no idea what discoing your referring too, and I don't think it is the dancing I may pull one of the fuel lines and see if there is Any flow. But it'll have to wait till tomorrow.

scuba

Discoing = Disconnecting.

I had a problem when I had to remove my fuel tank, I hooked the lines up backwards when I put it back, I was getting a problem similar to this..

blakehii

You will not hear the fuel pump because the pump will not start pumping until the engine is actually being cranked. Have someone crank the engine while you listen, if it is working, you will hear it. Just because it makes noise does'nt mean that it is working right though.

dj86515

I had the same problem with my 93. Turned out the wiring along the fender (inside plastic tube cover) leading to the fuse box were shorted.

4R$pit

Hi Harold, I had a problem with the fuel pump suddenly cutting off while driving and also with starting, running for 5sec , then cutting off......Found the problem to be an erratically functioning "circuit opening relay". It is the final link after the fuel pump relay in sending power to the fuel pump!! Its a five-wire relay located behind the plastic passenger kick panal above the ECM, bolted by itself to a metal stay. I could only find it at Dealer for about $95..Ouch...Anyone know where to get one cheaper in aftermarket sources? When this thing fails, the only easy way to get power to fuel pump is by jumping the B+ to Fp contacts .

scuba

I have one for sale..And its nippon denso !!
https://www.yotatech.com/forums/f109...-relay-177023/




Pm me if you'd like it..

Shawn6string

I had a problem similar to that for a moment . Then I realized I did not have the AFM connected. The AFM sends a signal to the fuel pump. Mine would start and run for a second then would die. Test your afm, it may have gone bad.....