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P1693 with NO companion code

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Everyone says they’re had to be a companion code but they’re is none when scanning with my OBDLink. I installed new stock injectors but my truck still doesn’t run like other 24 valves. Other ones idle smoother and the engine sounds different. I’m really bewildered and I want my truck to run like a true 24 valve should. Valves have been adjusted as well. Where should I go next? 

Edited by JAG1

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  • Mopar1973Man
    Mopar1973Man

    Ummm... OBDLink shouldn't just stop with a P1693 code. It should show more. Just for a test pull the coolant temp sensor lead and trip an error code and re-read the error codes.    

  • Mopar1973Man
    Mopar1973Man

    Bad pop pressure, sticking injectors, etc. Another is excessively cold IAT will raise timing fairly steep. Make sure to run MPG mode.   Too bad you gave up on the Quad.

  • JAG1
    JAG1

    Thanks for chiming in. Its frustrating putting work into your truck, all the time thinking, 'how nice its going to run', but then something like this happens. No big deal really.... just have to keep

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  • Owner

Then most likely not an air issue. You can check with a piece of clear vinyl tubing for air but if the pressure is steady most likely nothing is wrong.

 

You did buy used injectors, didn't you? If so that would be my first spot to look about rough running issues. 

  • Author
3 minutes ago, Mopar1973Man said:

Then most likely not an air issue. You can check with a piece of clear vinyl tubing for air but if the pressure is steady most likely nothing is wrong.

 

You did buy used injectors, didn't you? If so that would be my first spot to look about rough running issues. 

The injectors only had 2 hrs of runtime when I installed them. The po used them to break in his rebuild. The dap injectors ran funny to. Both sets have a intermittent misfire at random that won’t go away except on its own. Seems as if the injectors could probably be ruled out. I’m thinking maybe vp. 

  • Owner
8 minutes ago, Marcus2000monster said:

Both sets have a intermittent misfire at random that won’t go away except on its own.

 

It could be possible debris partial plugging a crossover tube. They are also called Edge Filters being there is tapered metal sleeve inside that attempts to beat and debris down to a size that will possibly fit there the nozzle of the injector. Rare but it could be.

 

VP44 for misfire is rather rare to hear to nearly unheard of. Being all it is a pump that makes pressure and sets the timing. There isn't much for magic in that little case. It's up to the injector to open at the set pop pressure and fire the fuel as an atomized mist. The only thing that I can think off is crossover tubes and possibly the delivery valves on the VP44 but even delivery valve failures are unheard of. PSG failure could be but typically it just doesn't run. 

When does the misfire occur?

  • Author
7 minutes ago, Mopar1973Man said:

 

It could be possible debris partial plugging a crossover tube. They are also called Edge Filters being there is tapered metal sleeve inside that attempts to beat and debris down to a size that will possibly fit there the nozzle of the injector. Rare but it could be.

 

VP44 for misfire is rather rare to hear to nearly unheard of. Being all it is a pump that makes pressure and sets the timing. There isn't much for magic in that little case. It's up to the injector to open at the set pop pressure and fire the fuel as an atomized mist. The only thing that I can think off is crossover tubes and possibly the delivery valves on the VP44 but even delivery valve failures are unheard of. PSG failure could be but typically it just doesn't run. 

When does the misfire occur?

It’s hard to say but usual when hot. I inspected all the crossover tubes well before I put them in.

  • Owner
6 minutes ago, Marcus2000monster said:

I inspected all the crossover tubes well before I put them in.

 

Kind of hard to do that... How did you open it up to check the edge filter inside? The outside is just part of it. The edge filter is INSIDE the crossover tube. Being that you reused the tubes, again and again, its a possible set of parts the could be a cause. 

 

As for the misfire when hot typically my first response is pop test the injectors. 

 

Now I wish you still had the Quadzilla I want to ask what is the fuel temp reporting? 

 

Edited by Mopar1973Man

  • Author
4 minutes ago, Mopar1973Man said:

 

Kind of hard to do that... How did you open it up to check the edge filter inside? The outside is just part of it. The edge filter is INSIDE the crossover tube. Being that you reused the tubes, again and again, its a possible set of parts the could be a cause. 

 

As for the misfire when hot typically my first response is pop test the injectors. 

 

Now I wish you still had the Quadzilla I want to ask what is the fuel temp reporting? 

 

Oh ok we’re thinkingnof two different things. That is a possibility. 

  • Author
9 hours ago, Mopar1973Man said:

 

Kind of hard to do that... How did you open it up to check the edge filter inside? The outside is just part of it. The edge filter is INSIDE the crossover tube. Being that you reused the tubes, again and again, its a possible set of parts the could be a cause. 

 

As for the misfire when hot typically my first response is pop test the injectors. 

 

Now I wish you still had the Quadzilla I want to ask what is the fuel temp reporting? 

 

How do you inspect for edge filters? 

  • Owner
54 minutes ago, Marcus2000monster said:

How do you inspect for edge filters? 

 

Replace the crossover tubes. That all you can do. All it takes is one crumb of dirt to be accidentally allowed in the crossover and it could partially plug it. I'm thinking of anything that could possibly limit fuel flow to the injectors. 

 

Being you need compression and fuel to make it ignite.

 

Beyond that, the other side of misfire could be compression. Like one of the old time members here JL Welding, he spent quite a bit of money chasing a misfire issue to find out it was cracked piston. A cracked piston can pass a blowby test but will not pass a compression test which he never did. Ended up doing a short block and fixing the problem.  

 

 

Could you not just sight thru them and see if any thing is in there?  Might be able to knock anything out with a stiff wire. I think I would try that before just putting new ones in.

  • Author

 this is what a 24 valve should sound like. This truck idles so perfect. This is what I need my truck to sound like!

On a side note the 1693 code disappeared.

  • Owner
On 5/1/2019 at 9:24 AM, dripley said:

Could you not just sight thru them and see if any thing is in there?  Might be able to knock anything out with a stiff wire. I think I would try that before just putting new ones in.

 

You better have a wire that is less than 0.006 to fit in the cross over tube. The purpose of the cross over to is to contain the edge filter with is a tapper plug that necks down to smaller than the nozzle holes of the stock injector so small object are hammered by the pulses till they are small enough to pass thru the injector.

    • Thanks 1
    10 hours ago, Mopar1973Man said:

     

    You better have a wire that is less than 0.006 to fit in the cross over tube. The purpose of the cross over to is to contain the edge filter with is a tapper plug that necks down to smaller than the nozzle holes of the stock injector so small object are hammered by the pulses till they are small enough to pass thru the injector.

    I am holding a new one in my hand. I can see into the hole on each as I have many times but now is first time I ever tried look thru one. Cant see squat. Never new the bore was that small thru it. Live and learn.

    I used compressed air on them before and blew them backwards just because before install. Then sprayed some carb cleaner and blew that clean. 

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