1997 XJ 4.0L AW4 Long Crank Problem

[WGxj]

I saw this topic/conversation discussed in the past, and being new to , didn't know if and where I should start a new thread.
Anyways, when I start engine cold, it takes 5-7 engine turns to finally start. Upon first starting, it stumbles a bit. I can clear the stumbling by hitting the throttle a bit. Fuel pressure checks indicate check valve so will be replacing Fuel Pump Assembly at Fuel Tank. But as seen in previous postings, I am wondering which is best to do first? Swap out the Fuel Pump Assembly? Or Swap out the Injectors? I am the 2nd owner of the vehicle. When I bought the vehicle I was able to get print outs of previous maintenance by the previous owner. It was well maintained. But now at 266k it is starting to show its age. I have not yet seen a very clean way of testing injectors other than removing them all while recording their installation location and order, and sending them to a company out in Oregon for testing. Any advice would be very helpful.

 

[Numbers]

Welcome!

I moved your thread to the tech forum, where it should get more eyes.

My 1996 seems to do the same thing when first starting, especially the starting a bit weird and being good after clearing it out. Anyways, it runs great once it is started, so i don't worry about it. I have always figured it is priming the system due to a bad check valve in the fuel system.

 

[Unclewolverine]

Mine has been long to start since the day I brought it home over 200k ago. Some people have spent much $ chasing the cause and never fixed it. As long as it starts every day, im leaving well enough alone.

 

[Rob Mayercik]

If your testing indicates a failed check valve in the pump assembly, I'd do that first and worry about the injectors second.

Also, it'd probably be the same cost (or possibly less) to just replace the injectors as to ship them out/back for testing.

 

[WGxj]

Decisions Decisions - I will let it go for now and focus my time and resources on the rear quarter panel Arch repair. But having already purchased a new fuel pump assembly and set of fuel line disconnect tools, with the exception of that spanner tool to remove the pump assy, I think I am about as prepared as possible if worse comes to worse. (called Bosch, they didn't say they weren't making them but couldn't give any indications as to when they would ever again stock them, discontinued by mfgr...)

 

[Tim_MN]

My 1998 has +290,000 and the original injectors, except for two that cracked, and were replaced with junkyard parts. If the injectors aren't broke, they don't need fixing.