Discussion Starter · #1 ·
Ok so there’s been hundreds and hundreds of threads about LLYs lopeing in park and neutral at operating temp and I have found zero that have helped. Mine is a 2005 LLY with 295,000 miles on its second set of injectors. To start off with things I have a noticeable lope at idle when warm only in park and neutral. It started doing the day I got it back from the shop in March of 2022. I noticed it right away and took it back to them the next day. They called me the day after and said there was a faulty injector and they got it fixed. So the next day I picked it up and it started fine with no issues until about 15 mins later when I stopped to get some fuel and noticed the lope. It only does it once the oil pressure drops below the 30psi dash on the gauge and the coolant temp is around 180. So I drove back to the shop and told them I was still having the issue. Long story short they told me I needed a lift pump and they quoted me 900$ for one if there fass systems. I held off on it until about August of 22 when I ordered an Airdog 100gph for about 650$ and did it myself. I did notice better throttle response and a few other things but it did not solve my lope in park. Since then I’ve done a new FPR, fuel filter head, fuel filter, new fuel lines to cp3, new ficm, ice picked all the injector pigtails, and a new pigtail for the fpr, still having the lope. I’m completely stumped. I’ve checked for the wire harness rub at alternator bracket and nothing there. The only thing I could think is faulty injector, or some weird electrical issue, and possibly an ecm reflash which seems to be highly unlikely. The engine is pretty much stock besides egr delete and exhaust system. Stock tune as well.