Mechanical Chirping/Squeaking at low RPMs
Hi everyone! Please bear with me, this is my first thread, but this is driving me crazy and I'm hoping for some help. Our van has a new noise. Ok, it's a 7.3 Quigley EB-50, so it makes plenty of noise as it is, but this one is definitely new.
After getting a new turbo and associated plumbing, and then replacing both valve cover gaskets, the van left the shop with a chirping/squeaking noise that occurs mainly at lower RPMs, and is particularly noticeable right after shutting down the engine, and also when starting up. It is less noticeable at speed, but that could be just because it's being masked by general engine noise.
It sounds like it's coming from the center dash area, or up near where the windshield meets the dash. It's more of a chip chirp chirp noise than anything else, but it's hard to pinpoint, especially over the din of the engine.
The shop has gone over the van multiple times and is confident the noise is not the result of the work performed, and indeed, it doesn't really seem like they were working in the area where the noise comes from. The next steps they propose are a total dash removal, which is pretty spendy just to see if they can find the problem.
I've removed the center console, doghouse, stereo, and checked everywhere under the hood for anything rubbing or loose, but I haven't found anything. And yes, I've pulled the CO2 and other detectors, but it's not that noise.
Has anyone else experienced this, or can anyone think of other areas to look? Any help would be greatly appreciated. Thanks is advance.