RAD4Runner's 1986 4Runner dlx Build-up
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RAD4Runner (04-25-2022)
#1202
I guess you can't call that " wasted space " now! Nice light reading in that pouch too.
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RAD4Runner (04-25-2022)
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RAD4Runner (04-27-2022)
#1204
Registered User
Thread Starter
Big Bear Overland Rode Shotgun
#Rad4Runner has already proven herself. Rode shotgun to test my friend's Montero.
Dinner at camp.
Domo Oregano! What's a Greek salad without oregano? LOL!
Sushi chef friend gave my Greek salad from scratch the Japanese twist.
In the morning we, not our trucks, climbed the rocks.
Tomb of Unknown Ingredients aka #LooWithAView LOL!
Dinner at camp.
Domo Oregano! What's a Greek salad without oregano? LOL!
Sushi chef friend gave my Greek salad from scratch the Japanese twist.
In the morning we, not our trucks, climbed the rocks.
Tomb of Unknown Ingredients aka #LooWithAView LOL!
Last edited by RAD4Runner; 09-28-2022 at 10:21 PM.
#1205
Registered User
Great photos Ray. Love the greek salad inside a cucumber. Great trip.
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RAD4Runner (09-01-2022)
#1206
Amazing scenery! We are so going to make cucumber sushi like that. That's awesome 👌 we had this rogue cucumber growing in our garden this year.
lol
Hey back to the 4runner, did you ever do the fuel pump swap? I just did on my 85 . Not a bad job. I got the idea from you.
here's a good video for it, another Alex Man video.
lol
Hey back to the 4runner, did you ever do the fuel pump swap? I just did on my 85 . Not a bad job. I got the idea from you.
here's a good video for it, another Alex Man video.
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RAD4Runner (09-28-2022),
SomedayJ (09-18-2022)
#1207
Registered User
What is it about the 80's 4Runner fuel pump? They all decided to fail at the same time. Mine died too a while back and I have not replaced it. I'm looking forward to cooler weather to fix it. I have the Denso pump, video by Alexman, and a new aftermarket hanger from eBay. I'm kind of nervous because I'm no mechanic. The dog is worried.
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RAD4Runner (09-28-2022)
#1208
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changing the pump in these is straightforward. i changed two on the side of the road, back when i went through 7 or 8 pumps in a one year span, with no clear resolution on why they failed. there’s a thread here on yotatech somewhere about it (here it is...middle of thread, my fuel pump failures). the one running right now was installed in early 2016...also a bit about it on my maintenance thread on t4r.org
Last edited by wallytoo; 09-18-2022 at 12:48 PM.
#1209
What is it about the 80's 4Runner fuel pump? They all decided to fail at the same time. Mine died too a while back and I have not replaced it. I'm looking forward to cooler weather to fix it. I have the Denso pump, video by Alexman, and a new aftermarket hanger from eBay. I'm kind of nervous because I'm no mechanic. The dog is worried.
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RAD4Runner (09-28-2022)
#1210
changing the pump in these is straightforward. i changed two on the side of the road, back when i went through 7 or 8 pumps in a one year span, with no clear resolution on why they failed. there’s a thread here on yotatech somewhere about it (here it is...middle of thread, my fuel pump failures). the one running right now was installed in early 2016...also a bit about it on my maintenance thread on t4r.org
#1211
Registered User
iTrader: (1)
how did you determine that it was the fuel pump? I'm a terrible roadside mechanic unless it's something that I already knew was an issue before it let go. I just did this as kind of a preventive maintenance procedure since the thing was 35 plus years old. And I kept the old one.
of course, no fuel at all via the return, with the key on/engine off/Fp to B+ jumped, also shows this, unless the injectors have massive leaks.
plus, as noted, i went through more than 7 pumps in just over a year. i got pretty familiar with diagnosing the pump not pumping.
Last edited by wallytoo; 09-18-2022 at 03:29 PM.
#1212
did you read that thread? i added a fuel pressure gauge, and when it shows less than 28 psi, with the FPR return pinched, i know the pump is not working at full capacity.
of course, no fuel at all via the return, with the key on/engine off/Fp to B+ jumped, also shows this, unless the injectors have massive leaks.
plus, as noted, i went through more than 7 pumps in just over a year. i got pretty familiar with diagnosing the pump not pumping.
of course, no fuel at all via the return, with the key on/engine off/Fp to B+ jumped, also shows this, unless the injectors have massive leaks.
plus, as noted, i went through more than 7 pumps in just over a year. i got pretty familiar with diagnosing the pump not pumping.
#1213
did you read that thread? i added a fuel pressure gauge, and when it shows less than 28 psi, with the FPR return pinched, i know the pump is not working at full capacity.
of course, no fuel at all via the return, with the key on/engine off/Fp to B+ jumped, also shows this, unless the injectors have massive leaks.
plus, as noted, i went through more than 7 pumps in just over a year. i got pretty familiar with diagnosing the pump not pumping.
of course, no fuel at all via the return, with the key on/engine off/Fp to B+ jumped, also shows this, unless the injectors have massive leaks.
plus, as noted, i went through more than 7 pumps in just over a year. i got pretty familiar with diagnosing the pump not pumping.
alright now I've read the thread, I didn't see the link originally. I no longer own a computer so reading all this on a phone. All them fuel pumps and no reason for a failure. That's disappointing. Maybe I should have read that thread before doing mine. I did it as a PM type of thing because the old one is probably original.
#1214
Registered User
iTrader: (1)
yeah, i added the link once i was on my computer (rather than my tablet). it was a pain to constantly pull the efi system apart, but i got pretty good at it and knew exactly which sockets/tools were needed and where. the upshot is that i'm willing to dive in and take the stuff apart; nothing in there that anyone with a tiny bit of patience, an FSM, and normal tool set can't take on. i will say that once i added the pressure gauge, diagnosing the fuel delivery got a lot more instantaneous!
the PM stuff i'd tackle would be vacuum hoses, coolant hoses, wiring improvements - instead of replacing functioning "parts" like COR, fuel pump, afm, tps, etc. as an example, my '95 legacy wagon, which my first 4runner replaced in 2013, had 300k miles on it, and was still running its two original fuel pumps. the car was plenty rusty by then, but those pumps were fine - as i understand it, the guy i gave it to still drives it in his sandpit, and let his kids learn to drive stick with it (in the sandpit).
the PM stuff i'd tackle would be vacuum hoses, coolant hoses, wiring improvements - instead of replacing functioning "parts" like COR, fuel pump, afm, tps, etc. as an example, my '95 legacy wagon, which my first 4runner replaced in 2013, had 300k miles on it, and was still running its two original fuel pumps. the car was plenty rusty by then, but those pumps were fine - as i understand it, the guy i gave it to still drives it in his sandpit, and let his kids learn to drive stick with it (in the sandpit).
Last edited by wallytoo; 09-19-2022 at 04:05 AM.
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RAD4Runner (09-28-2022)
#1215
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Join Date: May 2011
Location: Southeast Virginia
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What is it about the 80's 4Runner fuel pump? They all decided to fail at the same time. Mine died too a while back and I have not replaced it. I'm looking forward to cooler weather to fix it. I have the Denso pump, video by Alexman, and a new aftermarket hanger from eBay. I'm kind of nervous because I'm no mechanic. The dog is worried.
The following 2 users liked this post by arlindsay1992:
Damion812 (09-19-2022),
RAD4Runner (09-28-2022)
#1216
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RAD4Runner (09-28-2022)
#1217
just an FYI/update for this super old (helpful) post, my 86 RTE doesn't have an STJ to the ECU (this is correct in the FSM but I was confused for a long time)
I rehabbed my wiring harness during my rebuild - I started off just planning to add in the starter relay, but ended up tearing out a lot of the old aged wiring and replacing it. While a lot of the ~86 wiring harness connectors are unavailable/hard to find, the injectors all use a standard GM "EV1" connector, including the cold start injector and (amazingly) the Injector Time Switch too, so I grabbed 6 (4x fuel injectors, 1x cold start injector, 1x cold start time switch) of them from my local NAPA ran all new wiring for all those circuits.
I used https://www.napaonline.com/en/p/CRB218457 - which were the more expensive option but are much easier to remove than the cheaper ones and have nice rubber grommets.
Still looking for a source for the other square connectors...
I rehabbed my wiring harness during my rebuild - I started off just planning to add in the starter relay, but ended up tearing out a lot of the old aged wiring and replacing it. While a lot of the ~86 wiring harness connectors are unavailable/hard to find, the injectors all use a standard GM "EV1" connector, including the cold start injector and (amazingly) the Injector Time Switch too, so I grabbed 6 (4x fuel injectors, 1x cold start injector, 1x cold start time switch) of them from my local NAPA ran all new wiring for all those circuits.
I used https://www.napaonline.com/en/p/CRB218457 - which were the more expensive option but are much easier to remove than the cheaper ones and have nice rubber grommets.
Still looking for a source for the other square connectors...
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RAD4Runner (09-28-2022)
#1218
Registered User
Thread Starter
how did you determine that it was the fuel pump? I'm a terrible roadside mechanic unless it's something that I already knew was an issue before it let go. I just did this as kind of a preventive maintenance procedure since the thing was 35 plus years old. And I kept the old one.
I finally replaced mine. Write-up here: https://www.yotatech.com/forums/f116.../#post52480023
Mine was sort of corrective maintenance because I was starting to get worse long-cranks before combustion issue. Then when I finally replaced it @289,276 miles, I found the pre-filter screen torn, and the resistance of pump, although not mentioned on the FSM is much lower than the new pump. So I'm guessing, 200,000 miles would be a good time to buy spare pump AND inspect the old one, OR better yet if there is any slight issue with fuel system the suspect, replace the old pump and keep it as spare.
@wallytoo , Assuming good fuel and good quality OEM pumps, the only thing I can think of is if there is some power loss (voltage drop) on your wiring to the pump such that it is not getting proper voltage. Unfortunately, I haven't had chance to monitor normal voltage at pump.
Last edited by RAD4Runner; 09-28-2022 at 11:51 PM.
#1219
Registered User
Thread Starter
RE: No STJ to ECU on the 1986, that is correct. I haven't seen the 1987 schematic but I know the 1988 has STJ to ECU. I discussed it here, too:
https://www.yotatech.com/forums/f116.../#post52385373
Last edited by RAD4Runner; 09-29-2022 at 12:03 AM.
#1220
Registered User
Alexman, I'm in the RVA area. The '89 is not really a priority. I have all the parts, the tools assembled, and your excellent video ready when the weather is perfect and I'm in the mood to work on it. My son just came down with the bug today, tested positive, so I guess I'm doomed for the next ten days or so. LOL. My younger son used to daily drive it, but he's moved to western VA. I've belonged to Yotatech so long my 9-year-old is 23. I bet it only takes about an hour to complete.
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RAD4Runner (09-29-2022)