Shakey idle and sluggish take off


Alright, doing some research on this. I found that it's most likely the two different techs not mixing. The new injectors I bought from RA are 4 port disk injectors. They supposedly open quicker and close quicker then the old pintle style ones and can cause the same fueling imbalance when mixed with the old injectors.

I guess I didn't read in-between the lines when I was told to reach out and find some factory ones to replace the two.

I am thinking of just ordering a set of 6 and being done with it and send the skp ones back to RA.

I found these on eBay. Not sure if I want to pull the trigger yet.

 
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That's awfully cheap for real bosch injectors. Especially new. If it's true it's a great deal. They're $7.19 each + tax at the Pull-N-Save nearest me. That's only $11.50 each for new.
 
SenorNoob said:
That's awfully cheap for real bosch injectors. Especially new. If it's true it's a great deal. They're $7.19 each + tax at the Pull-N-Save nearest me. That's only $11.50 each for new.
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Yup I agree and I am cautious about it. I emailed the seller asking for more pics and details along if they are disk or pintle style.

I've also reached out to a few scrap yards on car-part to try source some matching OEM ones instead and I can just rebuild those missing two for a matching set.
 
Just to keep everyone appraised.

I ended up ordering two remans from injector planet.

That eBay listing is knock offs and the few junk yards I called wanted 25 dollars a injector when injector planet was 25 dollars for the remans. I'll take the remans over junk yard ones that may or may not be any good.
 
ryan445 said:
Just to keep everyone appraised.

I ended up ordering two remans from injector planet.

That eBay listing is knock offs and the few junk yards I called wanted 25 dollars a injector when injector planet was 25 dollars for the remans. I'll take the remans over junk yard ones that may or may not be any good.
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I know you're not going to want to hear this, but do all injectors at the same time. Sell your old ones on eBay if you want to recoup some of the cost.

Unless you already have four fresh ones in hand, you're going to be fighting injector problems later on. Best replaced as a set of six.
 
PetroleumJunkie412 said:
I know you're not going to want to hear this, but do all injectors at the same time. Sell your old ones on eBay if you want to recoup some of the cost.

Unless you already have four fresh ones in hand, you're going to be fighting injector problems later on. Best replaced as a set of six.
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Injector planet only had 2 in stock unfortunately. I want to do all 6 at this point. I have a supplier who have 3 GB reman ones in stock so I can grab those and be left with just 1 old one left. Other option is I can send my remaining 4 to injector planet and they can reman them and send them back.
 
Well, defiantly going the replace the remaining 4 route when I have the funds in a few weeks. I replaced the two aftermarket ones I got from RA with some rebuilt and flow tested ones from injector planet. While it now idles smoothly. If I try to drive it or rev it a few times. It starts missing and shaking as if I pulled a plug wire. It will do that at idle afterwards for a min and then smooth out.
I am pretty sure I botched on of the remaining 4 when I rebuilt them. I am sure debris got into one of them even though I tried my best. Maybe a piece of filter screen as the factory ones disintegrated when I went to pull them out. I blew out what I could......

It seems one of them is not keeping up with demand under load and struggles to catch up at idle for a minute afterwards.

It didn't do this until after this adventure. So I know it's something I messed up.
 
Check your connectors...
 
ryan445 said:
They seem to all be clicked on
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Let the truck idle, disconnect one of the time, listen for a change. I'm starting to wonder if you're not having fuel pump issues, I believe your truck has two of them. It is possible to delete the rail pump with a modern pump in the tank. I did it on my 88, it was worth doing
 
PetroleumJunkie412 said:
Let the truck idle, disconnect one of the time, listen for a change. I'm starting to wonder if you're not having fuel pump issues, I believe your truck has two of them. It is possible to delete the rail pump with a modern pump in the tank. I did it on my 88, it was worth doing
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The stock fuel pump system on a 2.9 is really stupid. They use a low pressure high volume pump in the tank to lift into the fuel rail pump that's high volume high pressure. You can just go to a high volume high pressure in the tank, and slap a fuel filter where your frame pump used to be. Double filtration!
 
PetroleumJunkie412 said:
The stock fuel pump system on a 2.9 is really stupid. They use a low pressure high volume pump in the tank to lift into the fuel rail pump that's high volume high pressure. You can just go to a high volume high pressure in the tank, and slap a fuel filter where your frame pump used to be. Double filtration!
Click to expand...
This is something I do want to do. My fuel sending unit starts to become very inaccurate once it reaches half a tank. So I've been wanting to do the sending unit and pump at the same time.

But this missing issue didn't happen till I messed with the injectors. It had a slight miss at idle. Now the miss at idle is gone but turns into a dead cylinder miss under load and is now undrivable. Where as before it was drivable, just sluggish at times. What's strange to me is the miss stays for about a min and smooths out and the then idles fine.
 
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