Shakey idle and sluggish take off

[89longbed]

Edit again.... The two aftermarket one are rated 19ibls according to the Google search I did on the part number stamped on the side.

My search engine is saying the flow rate for the injectors on a 2.9L is only 14.8-15 lb/hr, but I can't confirm that figure. You should be able to check with the part numbers from the Bosch injectors. If it's correct, those two cylinders (with the odd injectors) could have been running richer than the others. If those are cheap knock-off parts, who knows what their flow rate actually was.
Was it 2 fouled plugs you had or 3? I can't find that in the thread anymore.

 

[ryan445]

My search engine is saying the flow rate for the injectors on a 2.9L is only 14.8-15 lb/hr, but I can't confirm that figure. You should be able to check with the part numbers from the Bosch injectors. If it's correct, those two cylinders (with the odd injectors) could have been running richer than the others. If those are cheap knock-off parts, who knows what their flow rate actually was.
Was it 2 fouled plugs you had or 3? I can't find that in the thread anymore.

It was 3, but looking back at the pictures. The third one may have been fouled due to the leaking valve covers. There is evidence on one plug that oil was seeping past the threads. And that one was the rear most plug on the driver passenger. Also one old injector was leaky. That cleaning did fix it. Could have been that plug as well as I didn't keep track of where I pulled them other then the 2 odd ones. My searches are showing the same. 14 Ibs stock. Google shows that these are BWD injectors rated at 19ibs/ for the 2.3, 4.0 and 5.0

 

[SenorNoob]

Oil past the spark plug threads? So like from the top? How does that work without compression leaking out?

 

[PetroleumJunkie412]

So, I'm in the tear down to getting the injectors out and came across something I don't think should be. When removing the upper intake, there was oil where the upper and lower intake manifold meet. I'm sure that is not normal. The valve cover are leaking but no way this is from that. Is this normal on these 2.9s for oil to seep right here? May from pcv valve? Definably smell gas in the lower intake.

Pic for reference. And yes there was a gasket there.

Probably a vacuum leak with this as well.....


Also, I got two injectors that do not match the OEM ones. Different spray ends and all. I think these were put in by a mechanic that I had so a head gasket job about 10 years ago. I wonder if they are the same flow rate and if not is also adding to issues.


EDIT: I think those two aftermarket injectors are the issue. They spray a sold powerful stream vs a more mist like stream like the factory one.

Edit again.... The two aftermarket one are rated 19ibls according to the Google search I did on the part number stamped on the side.

Completely normal on a 2.9. 40 years of bullshit in there.

 

[PetroleumJunkie412]

It was 3, but looking back at the pictures. The third one may have been fouled due to the leaking valve covers. There is evidence on one plug that oil was seeping past the threads. And that one was the rear most plug on the driver passenger. Also one old injector was leaky. That cleaning did fix it. Could have been that plug as well as I didn't keep track of where I pulled them other then the 2 odd ones. My searches are showing the same. 14 Ibs stock. Google shows that these are BWD injectors rated at 19ibs/ for the 2.3, 4.0 and 5.0

19lb injectors without tuning will absolutely ruin your day.

 

[PetroleumJunkie412]

Othen then the pcv, I don't know why oil would be there. The valve covers are leaking bad and the gasket will be replaced while this is evolving but I don't think the cover leak can reach this high on the intake.

I think the mismatch in the spray pattern is the main issue with those new ones. And they corresponded to the fouled plugs for sure.

That mechanic was 10 years ago and I lived in California at the time. Now I'm out in Texas. So I'll try to source some factory ones some how or good reman ones and test them before installing.

I gotta thank you, the cleaning went well and I wouldnt have found this without your input.

Cs performance builds good refurbs.

I may have some old stock ones laying around somewhere... maybe. The ones 2.9s use aren't all that prone to failure. You can usually get away with remans without issue.

 

[ryan445]

Oil past the spark plug threads? So like from the top? How does that work without compression leaking out?

Beats me. Its just what it looks like visually. I've attached the photo for reference.

I just finished the injectors. And it seems to have smoothed out a bit, may need to reset the computer so it relearns the fuel trim not sure why I didn't do that before starting it. Still stumbles a little when it idles down but has improved and the lag on the throttle also improved. Gonna leave the batter disconnected over night and donate relearn.

 

[SenorNoob]

All of that is below the sealing surface. Leads me to think it came from inside the engine. That would imply burning quite a bit of oil...

 

[ryan445]

All of that is below the sealing surface. Leads me to think it came from inside the engine. That would imply burning quite a bit of oil...

Only thing that is getting me is it is not smoking out the exhaust.

At least I would think it would. I don't loose oil that fast. Im not loosing any more oil then when I got the truck 16 years ago. And now that the valve covers are good I would expect any oil loss would be from the leaky oil pan and probably some minor burn. The engine itself only has 175k on it.

 

[SenorNoob]

Maybe just oily threads when it was installed? Still wet after all this time?

Every time I've see oil from the top side, it starts right where that dirt line is on the porcelain.

 

[ryan445]

Il

Maybe just oily threads when it was installed? Still wet after all this time?

Every time I've see oil from the top side, it starts right where that dirt line is on the porcelain.

l will do a compression test one of these days.

I do imagine the compression isn't when it should be after almost 40 years and I'm sure some oil is seeping by the rings in some fashion.

 

[PetroleumJunkie412]

Beats me. Its just what it looks like visually. I've attached the photo for reference.

I just finished the injectors. And it seems to have smoothed out a bit, may need to reset the computer so it relearns the fuel trim not sure why I didn't do that before starting it. Still stumbles a little when it idles down but has improved and the lag on the throttle also improved. Gonna leave the batter disconnected over night and donate relearn.

My man you need a catch can...

 

[89longbed]

just finished the injectors. And it seems to have smoothed out a bit, may

Are you running it with the four 15 lb and the two 19 lb injectors? I don’t recall reading that you got some replacements.

 

[ryan445]

Are you running it with the four 15 lb and the two 19 lb injectors? I don’t recall reading that you got some replacements.

I got two new 15 in injectors. And the spray pattern matched the OEM ones.

Right now I think I have introduced a vacuum leak. It runs smoothly when I raise the rpms and hunts at idle. I ran out of day light yesterday so to day I'm gonna look for it. I think one of the injectors isn't seated all the way down. Gonna do the ole spray carb cleaner to find it.

I also did not pull the battery cable and let the computer do a relearn. If that matters in this case.