I'm driving a 1990 4runner 22RE 4x4 man 5sp, which has a switched bypass of the 'circuit opening relay' (because it's pooched, but I still need to get to work). It intermittently runs good, like a toyota, and then it gives me the Volkswagen treatment the rest of the time. It did this before the C.O.R. cavved too.
I'm thinking maybe airflow meter or a vacuum problem, even though I haven't found any vac/leaks yet. Oxy-sensor issue ?
No good toyota mechanics around here...

 

not an EFI guy...

 

any codes stored? pardon my not understanding the vw stuff, what you nean? and the c.o.p only for key on cranking then switches through VAMF through efi main relay suppling power to FP after start up.

 

I'm thinking he means vw have trouble constantly with everything.

 

Sorry, I mean it sounds like a VW and is as Gutless under load....

 

codes bring up fuel pump (due to shot C.O.R.), airflow meter etc. The C.O.R. has to be intact for the fuel pump to function, which is why it is bypassed.... through the check connecter. Regardless of that, it was doing this off and on before the C.O.R. died.

 

hows the fuel filter? ever been changed? try some simple stuff first, plugs wires cap rotor and the such

 

Yeah all of that is good, I've had enough of these lovely little trucks to know to cover my bases first. Thanks for the support though...
Could be bad ground/short maybe... I'll get back at it and start testing circuits.
I was mostly trying to see if anyone has had this same problem and could tell me off the hop what it might be... I probably should change the title of this post hey?

 

have seen the wire loom where it comes from intake to right fender liner crisp some wires and cause the like condition, not easy to find or tackle but if all else fails have a look

 

The COR is basically a switch in the ECU/ECM power circuit, just like the EFI/MFI Relay(a.k.a. EFI/MFI Main Relay). Not the switch for the fuel pump power circuit, that's in the VAFM.
To my point then. Since it's bypassed, all you've done is taken that relay/switch out of the power circuit to the computer. Which doesn't explain ANY of the codes you're getting. By the sounds of it, you've either got a fried ECU/ECM, and/or some serious issues with your VAFM that need to be addressed. And if it's been like this since before the COR died, how can it have anything to do with that anyways?

 

refreshed my memory on the wiring and the C.O.R does operate the FP oops my bad, however the signal to the vafm does have a resistor in the COP, I wonder if the relay failing and now that its bypassed might have some bearing on it?

 

No, it doesn't actually. Like I said, it's just a switch, but a remote-controlled one like any other relay. And there are no resistors in it either. I just had mine apart a few weeks ago. So I know EXACTLY what is in there. It's like what's described below.



BTW, what's a COP?
I can't see how. The relay is only a remote-control power switch. Just like a light switch on the wall in your home(aside from not being manually controlled)it's only "ON/OFF". And just like switching the light switch doesn't hurt anything, neither would a malfunctioning relay. Relatively speaking that is. As some electrical/electronic components/mechanisms/devices are duty rated in "on/off cycle" expectancy over the unit's lifetime. Generally the number of cycles is in the many tens to hundreds of thousands, or even millions, for those types of things though.(Relatively as in...it doesn't really apply here, because how many times are you going to start/stop the truck's engine in it's lifetime?, a Circuit Opening Relay or any other electrical/electronic component in question "should" easily last longer than that many on/off cyles since they're not scheduled maintenance parts that ever "need" replaced if they ain't broke, meaning they probably aren't duty rated in "on/off cycles" anyways, but I thought I'd mention it because the concept of "lifetime on/off cyle expectancy" is related)

 

srry spelling error COR, i have looked at the actuall ele wire diag from toyota on your truck and it does have a resistor or winding in it. i know what a relay is and how it works. im just trying to offer advice from a factory trained technician

 

here is the actuall pic i looked at, this is 1/10th of the diagram but it shows the relay and i added a couple of arrows and bubbles with text just to show you

 

Actually 'MudHippy', not to be snippy, but there IS a difference between a regular relay and the COR (CIrcuit Opening Relay) I've had them all apart as well, the 1990 4runner COR HAS a capacitor, unlike your basic relay, as in your handy diagram, for say a flasher or headlight relay which goes without any capacitor. Moreover I've looked at several similar vehicles (same engine, same everything) and they are all different from each other so far.
Though, as I already said, and you reiterated, I don't believe it has any bearing on the VW mimic issue.

"To my point then. Since it's bypassed, all you've done is taken that relay/switch out of the power circuit to the computer. Which doesn't explain ANY of the codes you're getting. By the sounds of it, you've either got a fried ECU/ECM, and/or some serious issues with your VAFM that need to be addressed. And if it's been like this since before the COR died, how can it have anything to do with that anyways?"
Maybe in your haste you didn't notice I said "... 'off and on' before the C.O.R. died."
I appreciate that you are trying to help but I could do without the condescension.

 

Thanks 'toyotacharles'

 

Excuse me!? My haste. You mean your haste. Maybe you didn't notice I said "resistor", NOT "capacitor". 2 different things I'm afraid...BTW, do you even know why it's there? Well...I'd tell you, but you'll figure it out eventually right? Better figure this out first though:

Capacitor: A capacitor (formerly known as condenser) is a device for storing electric charge. The forms of practical capacitors vary widely, but all contain at least two conductors separated by a non-conductor. Capacitors used as parts of electrical systems, for example, consist of metal foils separated by a layer of insulating film.

Resistor: A resistor is a two-terminal passive electronic component that implements electrical resistance as a circuit element. When a voltage E is applied across the terminals of a resistor, a current I will flow through the resistor in direct proportion to that voltage. This constant of proportionality is called conductance, G. The reciprocal of the conductance is known as the resistance R, since, with a given voltage E, a larger value of R further "resists" the flow of current I as given by Ohm's law:


Good luck with your issue there...I'm off to bigger and better things unfortunately..sorry about that...

 

That's the power circuit through the COR to the VAFM. According to your diagram. There still are no resistors involved with it. What are you seeing that I'm not there??????????

BTW, I'm sitting with mine in my hands right now looking at it opened. No resistors...don't make me , because I will you know?

EDIT: Found it...it is kinda hidden under the coil there. No excuse, I's wrong on that account.

 

Welcome back MudHippy

 

nothing more to say atm