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I have a few failing fuel injectors and thinking about replacing all 8. Maybe my milage will improve and finally pass emissions ? I've been having a hard time finding a Siemens data sheet for the original injectors to select a replacement. Without a data sheet, I've resorted to scraping the web for info. And, it's been a bit inconsistent See; below
The Mopar pns:
5303 0262 (obsoleted replaced by 5303 0778AB).
5303 0778 (obsoleted).
I've calculated the injector duty cycle on the 5.2L is about 44% using pn 53030262. The 53030778 replacement bumps the duty cycle to 56%.
I've also seen info on bosch, 4 pin replacements, but they seem to increase the operating duty-cycle from 44% to 55%. Is there a decent replacement for the OEM injectors that won't increase the duty cycle beat the heck out of the original ECU injector drivers and injectors?
If you search on the part number, with no space, you can find them. Crown makes 'em, but, almost 100 bucks a whack, outrageous. You can find Remans on Ebay, for 20 bucks a pop. If you are going to replace more than one, replace ALL of them. They all live in the same environment, so, if two or more are failing, you can be the rest aren't too far behind.
Thanks for the reply. Yeah, I'm looking to swap them all out for new and $800 is a tough pill tp swallow, especially for a rebuilt injectors
I don't know much about fuel injectors. I'm learning as I go. I'll share what I find.
A few forums suggest the bosch 4 hole/pin,EV1 injectors, but they are rated for 23lb@49psi. Operating them on a '94 5.2L magnum increases their duty cycle to 70%. I'm not sure the stock ECU will handle a 70% duty cycle for long without burning out. There are some bosch EV6 injectors but require a ev1 to ev6 adaptor. The original single pin injectors stream fuel onto the intake valve. The fuel may be used to cool the valve. I'm concerned if I move to a 4 hole/pin, the valve will run hotter than designed. Anyone know abt that ?
I'll continue to look, more specially compare the physical dimensions of the injectors. At first glance EV1 and EV6 injectors have the same length and in/out diameters. I'll track down and publish the dimensions on this thread.
I'll also continue to search for the mfg data sheets for the injectors. Bosch seems to have made their injector's data sheets available. I'm not sure if Siemens even in that business any longer or sold it off. Either way I can't seem to find their data sheets. I'll publish what I find on this thread, maybe it'll help someone in the future.
Last edited by Action Potential; Dec 21, 2022 at 05:00 PM.
I used Bosch #0280155784 (EV6) 22.3lb/hr@43.5psi (23.7@49psi) 12.5ohm
These are 4Port injectors, and you need EV1-EV6 Adapters to plug in the harness.
They're working great for me (over 100k on them).
I've also heard of folks using Bosch #0280155703 22.5lb/hr@43.5psi on 360's.
Dodge used the same injector on the 5.2 and the 5.9.
A higher flow rate at the same psi means less duty cycle.
It is important to use injectors with a coil resistance that is close to stock.
Last edited by Spillage; Dec 21, 2022 at 11:02 PM.
I just got some Bosch data. There is about 1627 different injectors listed. I'm converting ot to an excel spreadsheet, then try to figure out which ones may work. This year the kids are at the respective in-laws for the holidays so I'll have some time to pull it together.
I have the 2008 Bosch fuel injector data. I'll send a request to Bosch for current data. I'll convert the metric stuff to imperial in another spreadsheet this weekend.
Last edited by Action Potential; Dec 21, 2022 at 11:31 PM.
@Spillage Thanks for sharing. It'll same me a bunch of time.
The other issue is that Bosch makes so many injectors, we need to find the ones available and at low cost. Picking an injector no one stocks or costs $150/ea does no one any good.
New injector for a '94 5.2l ?
