Hey all,

I'm trying to diagnose an issue that I likely created. Last week I finished installing an IPR gen3 egr delete, a new IPR valve, blue spring kit, oil change (w/ new fuel filters), and coolant flush. When I finally finished putting everything back together, the engine is now missing under accel/higher rpms. I've mostly done the testing in neutral since the truck was in my shop on stands until yesterday. Basically, if I slowly rev up from idle, I can get to ~2k-2.2k rpms before I hear/feel and missing. However, if I accelerate quickly from idle, the missing is apparent immediately. I've taken a video:
I put my livewire in the frame towards the end to show the IPR duty cycle/icp pressures (they look good to me?).

I've already reseated my injector connectors, checked my ficm connections, and reverted to the original fuel pressure spring. I also reverted to factory tune... stilll no luck.

I'm worried I damaged an injector. When I originally put everything back together and went to crank it, there was a massive oil leak. It turns out one of the bolt holes for the oem oil cooler water jacket housing punctured through (previous owner probably used too long a bolt?). Of course, the IPR egr delete doesn't use this bolt hole, so now oil was happy the pour out of it.i I cranked for a total of probably ~2mins with the oil leak as I searched for where it was coming from. Could those 2 min of low oil pressure (it was able to start twice but ran very rough and died shortly thereafter) have damaged an injector? I've since taken it all apart, put black RTV silicone in the hole, chopped the bolt shorter, and tightened it back in there. Fortunately the bolt head doesn't interfere with the IPR delete, and I haven't seen any oil leaking out.

Anyways, got any advice on where to look? I'm on the verge of buying Autoenginuity, but would love to not shell out another $350. I'd also like to bring it to my mechanic, but he's an hour away and I don't want to damage anything further...

Thanks,john

 

It can take a while to work all the air out of the system. Maybe up to 50 miles and doing some "spirited" accelerations in that 50 miles. Have you done that?

 

Can't say I have, are you talking about air in the fuel or oil?

 

air in the high pressure oil system. I am assuming you might have gotten air in that system when you had low pressure in the lube oil system. You also installed a new IPR valve. Maybe a poor assumption, but just asking.

 

I'm hesitant to take it driving around much because it was lurching quite a bit from all the misses as I accelerate. I've only driven it about 1/2 mile in my neighborhood.

 

Alright after driving it around a bit, I don't think it's gotten any better. I do have better clarity on how to describe what's happening though. As I accelerate through ~1800rpm, the engine starts lurching, like half of it is making power, half skips, etc, but still makes enough power to keep accelerating. If I hold a speed, it doesn't lurch. The lurching is much more pronounced in 3 and 4th gears, still happens in 5 but it is more subtle.

Additionally, my symptom that was occurring before the work sprung back to life again (driving along and the engine randomly stalls/dies with white smoke out of the tailpipe. Was hoping a new IPR valve would fix that. I haven't narrowed down exactly how to reproduce it. Sometimes it'll happen all the time, other times it'll go a week without it happening). I'm not sure if these issues could be related, or if they're happening simultaneously but for separate reasons.

 

Resolution: the Allianz ipr valve I bought on ebay was junk. Mechanic replaced it with an oem one, and all issues were fixed.

 

Thanks for posting a resolution, and another endorsement of getting Motorcraft replacement parts only for things like this.