87 4Runner no start after elevation change
Jul 28, 2018 | 10:40 AM
#1
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87 4Runner no start after elevation change
I have a 87 22RE. I reacently had it shipped from 4500’ to sea level and am now experiencing no start. It ran great at high elevation and would start right up.
-i have spark, fuel , compression.
-it will hit with a shot of eather then die
-all fuses are good
-plugs are good
-if I cover my intake I can start it but it will die as soon as I remove my hand or apply throttle
-it currently has 85 pump gas
I’m currently at a loss as to what to do. I’ve been browsing forums but to no avail.
-i have spark, fuel , compression.
-it will hit with a shot of eather then die
-all fuses are good
-plugs are good
-if I cover my intake I can start it but it will die as soon as I remove my hand or apply throttle
-it currently has 85 pump gas
I’m currently at a loss as to what to do. I’ve been browsing forums but to no avail.
Jul 28, 2018 | 11:05 AM
#3
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It could have been damaged but it only needed to be started to remove it from the trailer one time.
here here is what I’m seeing by the fender. It’s about 4 inches around and 6 inches tall. Two vacuum hoses on top and one on the bottom.
Jul 28, 2018 | 12:29 PM
#5
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i checked over the hoses once and found two small cracks. I coated them with polyurethane then tape after drying and was planning on ordering new plumbing shortly. After re attaching there has been no change.
Jul 28, 2018 | 01:41 PM
#6
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From: San Francisco East Bay
You might be able to get it to fire and spin a few revolutions, but without the VAF in the induction the fuel pump will shut off.
Jul 28, 2018 | 02:53 PM
#7
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jumped the fuel pump to ensure I would get fuel
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Jul 28, 2018 | 03:07 PM
#8
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From: Northern AZ
Jul 28, 2018 | 04:43 PM
#9
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From: San Francisco East Bay
I don't know what fuel-air curve the ecu uses down at zero air; maybe it dribbles in a little fuel, which allows it to fire if you choke the air WAY down.
Jul 29, 2018 | 07:43 AM
#10
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From: Alaska
Well, did you? try checking out my troubleshooting video.
https://www.yotatech.com/forums/f123...-101-a-305207/
https://www.yotatech.com/forums/f123...-101-a-305207/
Jul 29, 2018 | 03:07 PM
#11
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Well, did you? try checking out my troubleshooting video.
https://www.yotatech.com/forums/f123...-101-a-305207/
https://www.yotatech.com/forums/f123...-101-a-305207/
i had fuel fuel at my cold start injector and could see it spraying when I pulled it. As for the others I cannot be 100% certain. I will pull one of the injectors to make sure they are spraying as well
your video didn’t work on mobile so I’ll try it on a computer later
thank you
Last edited by Karbo; Jul 29, 2018 at 03:08 PM.
Jul 29, 2018 | 10:30 PM
#12
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Hey, this is a long shot and maybe a dumb suggestion but have you checked that the air flow meter is connected? Maybe the connector is on but isn’t fully seated on the afm?
A couple of times after testing/replacing the afm I forgot to reconnect it. The truck would fire, start and then immediately die. Thankfully I realized my mistake right away, reconnected it and all was good.
Again, sorry if it’s a dumb idea, good luck.
Winky
A couple of times after testing/replacing the afm I forgot to reconnect it. The truck would fire, start and then immediately die. Thankfully I realized my mistake right away, reconnected it and all was good.
Again, sorry if it’s a dumb idea, good luck.
Winky
Jul 30, 2018 | 09:42 AM
#13
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Hey, this is a long shot and maybe a dumb suggestion but have you checked that the air flow meter is connected? Maybe the connector is on but isn’t fully seated on the afm?
A couple of times after testing/replacing the afm I forgot to reconnect it. The truck would fire, start and then immediately die. Thankfully I realized my mistake right away, reconnected it and all was good.
Again, sorry if it’s a dumb idea, good luck.
Winky
A couple of times after testing/replacing the afm I forgot to reconnect it. The truck would fire, start and then immediately die. Thankfully I realized my mistake right away, reconnected it and all was good.
Again, sorry if it’s a dumb idea, good luck.
Winky
any my idea is a good idea. I’ve checked multiple times and all appears fine there.
Jul 30, 2018 | 11:03 AM
#14
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From: Northern Colorado
Given that it runs (sort of) with your hand over the intake, I'd suspect it's getting excess air from somewhere which makes the mixture too lean to fire. Or, the VAFM is sending bad data, telling the ECU there is much less air coming in than is actually happening. Check out the VAFM and make sure it is working properly. The attached file gives some tests to run.
The change in air pressure from 4500' to sea level is not enough by itself to cause an engine to go from running great to not running at all. It's more likely the simple act of shipping the truck caused something in the intake to fail.
The change in air pressure from 4500' to sea level is not enough by itself to cause an engine to go from running great to not running at all. It's more likely the simple act of shipping the truck caused something in the intake to fail.
Jul 30, 2018 | 04:16 PM
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Given that it runs (sort of) with your hand over the intake, I'd suspect it's getting excess air from somewhere which makes the mixture too lean to fire. Or, the VAFM is sending bad data, telling the ECU there is much less air coming in than is actually happening. Check out the VAFM and make sure it is working properly. The attached file gives some tests to run.
The change in air pressure from 4500' to sea level is not enough by itself to cause an engine to go from running great to not running at all. It's more likely the simple act of shipping the truck caused something in the intake to fail.
The change in air pressure from 4500' to sea level is not enough by itself to cause an engine to go from running great to not running at all. It's more likely the simple act of shipping the truck caused something in the intake to fail.
thank you ill I’ll perform the checks
Jul 30, 2018 | 04:29 PM
#16
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From: Portland, Oregon, USA
The specifications RJR posted are for the 3VZ-E engine (uses the same testing process as your engine, but has different Ohm values).
You will need to use the 22R-E specifications as shown here: http://www.4crawler.com/4x4/CheapTricks/AFM/index.shtml
You will need to use the 22R-E specifications as shown here: http://www.4crawler.com/4x4/CheapTricks/AFM/index.shtml
Last edited by old87yota; Jul 30, 2018 at 08:07 PM.
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