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Hello group, I have a 99 Eurovan, 12 valve VR6, and I developed a misfire and a P1238 code on a recent trip.? It is an injector code for Cylinder #2.? Research indicates that it is not getting a ground signal, I believe?? My plan was to check ohm reading of the injectors from the loom connector there by the fuel pressure regulator and see if there was wire conductivity from there to the injector.? If that checks out, the next step, I believe, would be to follow that wire back towards the ECU and see if it is broken anywhere?? Does that sound reasonable?

It came completely out of the blue, and was somewhat intermittent at first, but now is a constant misfire or dead cylinder.

Any other ideas or insights are welcome and much appreciated.

Thanks,

Mark

On Mon, Jun 17, 2024 at 10:34 AM, Tabitha & Mark Reed wrote:

Does that sound reasonable?

Sounds like the right approach to me.? I believe that you understand the ECU furnishes the ground for the injectors.? We can hope that it's an open injector or wire and not the ECU.
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Duane
05HD Rialta
227K Miles

Agree with Duane.? Think the ohm value is between 12 and 16 ohms.? There may be electrical diagrams for this on this site.? V/R

So I had a few minutes to investigate the situation.? All injectors check out at 15 - 16 ohms except #2, which offers no reaction on the voltmeter whatsoever (open circuit).? This is checking at the 10 pin harness connector? near the FPR.? I tried to check that #2 connector at the injector was seated and it appears to be, so either the injector is dead or there is a break in the wire between point A and point B.? Either way the intake has to come off.??

Blah, I am not really in a spot to just get a new set of injectors.? Have any of you seen injector failures like this?? I have experienced the "short to B+" giving out of spec ohm readings before, but never just an open circuit reading across the injector.

Looking back I have replaced #2 injector before, back in or around 2014.?

There's lots of people reporting injector failures on VR6 engines, it's not uncommon. If you can swing it, replacing all 6 at once is the best course of action. Beware rebuilt injectors, they're usually just cleaned, and that doesn't address the failure of the coils which VR6 injectors seem to suffer.

I also replaced only the #2 injector due to wanting to be frugal.? Motor ran for years after that with no problem.? ?I can surmise that if you have an overheating event, like you lose one of your fan resistors, or both, now you are getting a superheated front of the motor under air conditioning modes.? This may, and I stress "may", cause this.? Once I fixed the injector and the fan resistors, no more injector failures.? ?For the AES motor, replacing the injectors is a tall order.? Don't know about the other? (2001 on).

Mike,

Yeah, I had a bout of injector problems about 7 - 8 years ago, and have had no issues relating to that for a good long while.? I do know looking back through the notes, #2 was replaced.? I have not had any overheating or using AC (I don't), and I know both fans are working / resistors good.? It maybe was it's time???

I have been dealing some problems with my kids cars that they are having, and also trying to get my 68 Bus back on the road.? But I suppose that pulling that intake manifold is going to have to be on the list here, I have just been avoiding driving it for the time being.??