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Old 01-18-2025, 08:38 AM #1
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Engine stalling and starting randomly

Hello everyone,
Unfortunate owner of an 92' 4Runner with the 3.0 V6.
It is GPL modified, very bad for the motor itself.
The GPL modification was revised by a "professional" mechanic who had changed everything, but it is very bad work...

Yesterday, i done a 5Km ride to the nearest shop.
No problem to start the engine, nothing was weird. But when it came time to return, it stalled miserably at a stop sign, and it was impossible to restart the engine.
Now it starts when it wants, and stalls very quickly. As soon as it stalls, it refuses to restart, and I have to wait a bit before it restarts.
It sometimes runs for 2-3 minutes, sometimes only a few seconds.

I checked my spark plugs, my distributor, my ignition coil and also my igniter.
After searching the forum, the only solution I see is the ECM.
I can't find it in the engine compartment even though the repair manual schematics shows it at the bottom left.

Maybe someone had the same issue ?
Or if you have any ideas or leads ?

Thanks to everyone who can see this, I'm desperate...
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Old 01-18-2025, 11:32 AM #2
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The ECM (and the COR (IIRC)) are inside the cabin behind the passenger side kick panel.
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Old 01-18-2025, 12:14 PM #3
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Maybe it will help us help you IF you tell us exactly what is a "GPL modification", sometimes I have a hard time with acronyms??

Even Google is having a hard time with this acronym!
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Old 01-18-2025, 01:15 PM #4
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^^^^ He's right. I meant to ask that too.
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Old 01-18-2025, 02:28 PM #5
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Sorry, I'm a bit stupid I didnt translate the acronym. In English it is LPG, liquefied petroleum gas. We have this everywhere in europe, and it is compatible with gasoline cars.
The extra pipes on the right of my engine are for this additional system.
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Old 01-18-2025, 02:56 PM #6
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We also have this modification but it's mostly done on commercial vehicles.

So I don't know much about what all makes it work, I'm guessing the gas is getting shut off, maybe a sensor, a valve or the metering device has failed.

Since you have a lot of vehicles using this type of system over there, there should be numerous mechanics familiar with these systems that could solve the issue.
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Old 01-18-2025, 03:21 PM #7
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Oh yeah, there's an LPG conversion for the 4 cyl carbureted 22R in my '84.
The main advantage for me was the steep angles it would operate at when off-roading.
I found that if I adjusted the float level in the carb out of spec it worked fine, so I never did the conversion.

Good luck!
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Old 01-18-2025, 04:00 PM #8
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I want to add that the problem is the same if I use LPG or gasoline. It is not fuel related problem...
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Old 01-18-2025, 04:31 PM #9
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I'm no expert, but I lean towards what @AuSeeker said, it sounds like a fuel delivery issue

Quote:
Originally Posted by AuSeeker View Post
... I'm guessing the gas is getting shut off, maybe a sensor, a valve or the metering device has failed.
If you have the same problem with gas and LPG, it sorta eliminates the system parts they don't have in common, so look at areas they do have in common.

Make any sense?
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Old 01-18-2025, 05:00 PM #10
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Thanks for the lead !
I will seek this tomorrow, I'll let you know if I find something.
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Old 01-18-2025, 05:55 PM #11
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Thanks for the lead !
I will seek this tomorrow, I'll let you know if I find something.
Let us know how it goes, this is the most interesting topic that's come along in awhile
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Old 01-19-2025, 05:46 AM #12
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I checked all the injection system (it is the only thing in common for the fuel delivery), all seems to be functionning correctly.
Another thing that is weird, the Malfunction Indicator Lamp will come on when the ignition switch is turned ON and the engine is not running, but when the engine will not start, this lamp is not lit.
Maybe it can help to find other leads...
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Old 01-19-2025, 10:44 AM #13
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Quote:
Originally Posted by TARK_ View Post
I checked all the injection system (it is the only thing in common for the fuel delivery), all seems to be functionning correctly.
Another thing that is weird, the Malfunction Indicator Lamp will come on when the ignition switch is turned ON and the engine is not running, but when the engine will not start, this lamp is not lit.
Maybe it can help to find other leads...
I'm not sure what you mean by "Malfunction Indicator Lamp" we don't have a light labeled or called that here in the USA, is that the "Check Engine Light" i.e. it looks like a little engine?
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Old 01-19-2025, 11:01 AM #14
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Yes, this is the orange engine icon. I tried to do the troubleshoting from the manual, but nothing happens. The engine icon does not power on...
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Old 01-19-2025, 01:25 PM #15
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Quote:
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I'm not sure what you mean by "Malfunction Indicator Lamp" we don't have a light labeled or called that here in the USA, is that the "Check Engine Light" i.e. it looks like a little engine?
Yes, Toyota refers to it as the MIL in their manuals.

And that is the correct procedure, and it usually works, I've done it before.
Make sure you are install a jumper between the correct terminals of DLC-1.
And the Ignition switch is in the ON position (not running) before installing the jumper. IIRC the MIL should come on briefly as soon as you put the Ign sw in the ON position.

Maybe the LPG conversion has some wiring changes that might be affecting it?
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'83 Toy P/U - Buick 231 V6, Holley 4 bbl, Weiand intake, Downey headers, TH350 w/700R4 low gearset,
'89 4Runner SR5 - stock

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