Mystery coolant loss seems to be the norm for these trucks. There are a lot of places it can sneak out, and not be readily apparent..... bypass hose, freeze plugs, heater core, timing cover gasket, etc..... Best bet it to clean everything off REALLY well, drive it for a while, and see if anything shows up.

 

+1 I just had/have this issue myself. I finally traced it to the gasket behind the timing cover but thats gonna get changed when I do my plenum. Took me a while to find it. Actually I was only barely losing any coolant but I could smell it and just kept hunting until found the leak.

 

5.9 and 5.9, regardless of year, is going to need the same delivery in fuel due to volumetric efficiency of the engine.. that never changed since the introduction of the small block.. I suspect the later Magnum models (OBDII) are more capable of trimming (read:curving) the pulse to manage it better... the 5.2's and 3.9's use the same injectors.. I suspect the difference in cam profile allows the 5.2L to breath to where the delivery isn't a show stopper- that, and the slight differences in programming (tune) on the PCM... The 3.9 is just a circumcised 5.2L..

which injectors are you replacing?

as far as loss of coolant- best of luck.. Those things can be a massive PITA..

 

Quote: but he does have the correct bosch gen 3 style 4 hole ones for my truck for 165.00


Are not the 3rd Gen style injectors EV6 type connectors used for 99 and up trucks and EV1 type connector for 98 and under. drewactual I hope will chime in here to say yes or no. There are adapter wires kits but to me that just adds more connections to go wrong.

 

damn right.. EV6 found on 99+, EV1 for 98-.. you really don't want to use adapters.. I DO have a set of adapters for EV6-to-EV1, (you can have) but I wouldn't rec them..

those things are silly sensitive to voltage.. I've read where the blades not contacting on both sides of the pin was a culprit (and a damn hard one to find) in goofy fuel delivery.. knowing what I know now, I never would have upgraded injectors.. it's quite a journey to get it right.

 

So why are the 5.2 and 5.9 injectors different? some are 19lb some 22 some 24?
and they do make bosch gen 3 injectors with the older stle ev1 plugs... I'll see if I can find the link..

like these...
http://fuelinjectorconnection.com/sh...&productId=191

according to this thread where homework seems to have been done the 5.2 and 5.9 injectors are different for a reason.... smaller engine smaller amount of fuel used?
https://dodgeforum.com/forum/2nd-gen...ur-trucks.html
here's a link to the older 19lb gen 3 injectors for the 94-95 rams... those are the older EV1 plugs right?
http://www.ebay.com/itm/1989-1995-DO...253775&vxp=mtr

 

the PCM can trim delivery.. but, it's got to have accurate information about what delivery rate it's capable of.. which is what I just endured..

in that picture (first one) on the thread you provided, are NOT 22# injectors.. they are 24# injectors.. I too believed this, and it was the root of my issues.. It is backed up in several pubs, and several forums- but I found it to be inaccurate.. they are absolutely 24# injectors..

the red OE injectors, likewise, are NOT 22# injectors.. they are 23.6#..


I'll make this short and sweet as I can:

the wideband a/f read stoich 14.7ish.. no problems.. the stft was crossing zero like it should.. the ltft was sky high- like, close to coding out high.. i couldn't figure it out.. everything else was right.. <- THAT, after MUCHO work..

it came down to one of two things: fuel pressure at the rail, and injectors.. fuel pressure was easy.. injectors weren't.. so- I started from scratch..

I had HemiFever draft 5% away from my 'upgraded' injectors.. he believed, and so did I, that the red ones were 22#.. they were not.. PLUS, we curved 5% away from what we thought were 24# injectors.. we were starving the engine..

but what about the independent a/f gauge reading 14.7ish?

the fuel delivery was still within parameters that the engine could manage.. I should add- during normal operations.. at WOT, I was SILLY lean.. It wasn't a problem, because I rarely see WOT.. but my ltft were still stupid high.. so, i searched..

i found what i previously stated: the red injectors are in fact 23.6# injectors.. the PICTURE of the injectors on that link are the right ones- the p/n tagged under that pic ARE NOT.. they are only 19# injectors..

between OBDI and OBDII, one of the greatest added features was more comprehensive fuel management.. the earlier engines were given injectors closer to what they need (volumetric efficiency).. the newer ones rely more on the PCM to adjust based on o2 readings, and the scripted tune bounced off of expectancy..

does this make sense now?

 

sort of... but I thought 24# injectors would be fine for a 5.9L?
Are you saying I will have issues unless I have a custom tune or that my pcm will learn and compensate?
which ones should I hope to get? I know many are rated at 43psi instead of the 49psi or trucks actually operate at which will put out more fuel than advertized right?

 

I learned something thank you. :}

This is what I came up with after hunting down the Bosch part number which is;
Bosch part 0-280-150-947 / Ford part # F1TE-D5A

You can look up the part numbers @ this site http://users.erols.com/srweiss/tableifc.htm

Numbers are

24.27lbs min @ 39.15 fuel psi 255.1cc/min, 183.5 grams, 2.7 bars
,
25.58lbs Flow @ 43.5 PSI / 3 Bars 268.9 cc /min, EV1 High Ford v8-5.0l, Truck v8-7.5l

27.287lbs Flow @ 49.5 psi 286.79 cc/min

27.28lbs is a big number to fat.

Again I hope drewactual will look this over


http://www.stealthauto.com/Products/...420_f0205_0425

 

Thats part of what I've been reading...these injectors are usually rated for flow at a different pressure than 49psi that the 96-01 uses...
Just came across this page...looks like a good breakdown on specs.... question I have is how important is the ohm rating? the 01 injectors had 15 ohm injectors so I wonder what was changed.