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Hi,This is going to be a real bugger to test outside of fuel pressure. At least with fuel pressure you could leave a gauge hooked up and laying on the windshield etc.Do you have any sort of scan/obd tool that shows data? Perhaps we could have that hooked up as well and watch RPM signal to see if it is at zero when the problem occurs (Crank sensor malfunction)?
No problem at all.Lets make sure that thing can read engine RPM specifically as that is a big suspect. If you have a reading for circuit opening relay (probably not... thats something you usually only see on the Toyota scan tool) we woudl want to monitor that too. Then we wait.... when it happens again hopefully we see something (zero or erratic engine RPM, c/open relay saying "off" etc).
Yeah the C code should be just there to turn the trac light on when there is a engine drivability fault.Lets watch that RPM value when the hard starting occurs and see if there is anything noteworthy there (like suddenly showing zero of course, or erratic reading). The 114 is actually a bit low, normally we see 200-240. It is still acceptable if it is steady though and engine is starting normally.Nothing else is too terribly interesting there.... perhaps watch the IAT and coolant temp too just in case. Either will cause sudden over fueling if reading out of spec, but I've honestly never seen either fail on a 4Runner before.
Not to mention neither would just suddenly cause it to go back to normal while cranking either. That is more like a crank sensor, or fuel related like we discussed before (building up pressure, clearing flooding etc).
Just keeping this one alive... any chance to check on those figures when the problem was occurring?
As opposed to normally seeing a little blip?
Yeah its real hard to tell on those.That's the big benefit to being able to see it on the scanner when the problem occurs. Not to say that the sensor is cutting out, but we have very few options getting away from the expected fueling theory.
Well we were talking about a potential injector that was dribbling while sitting, causing it to be too rich to fire.Pump is possible too, but its pretty rare to see them fail and when they do it isn't usually so sporadic, its usually all or nothing.
No, I wouldn't go that route on speculation alone, the misfire was enough to speculate on the #6, but thats it. I would say pulling the fuel rail and seeing if you have any drips while sitting wouldn't be bad... but honestly with #6 replaced (I wasn't clear you had already done that, I knew you bought it though) I would lean more electrical then.
Ohh... well that is interesting.If you go park in that same position will it do it again?Have you noticed any correlation with fuel gauge position (perhaps given the information about the angle, if it is occurring at a lower fuel level there is some water being sucked up etc)?
I don't suspect anything noteworthy with the fuel pressure though right? If we were seeing it dip before a problem event we might try crimping off the fuel return line (leaky regulator for example) or the previously mentioned leak check from the injectors when pulled.The sitting at an angle is interesting though... I'd like to see if that can be reproduced consistently or if it was just a fluke.
You might have nailed it... sometimes things just happen too and aren't related.i might even consider doing a compression test again and see if we were off base on the compression loss if it continues to start happy!
thanks.... well it was a nice thought anyway :)Keep an eye on it and keep trying to catch it on the scan tool when it happens and we'll see what's what. The good news is at least it isn't anything that prevents use (always resolves quickly).