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Just had the chance to take a nice long drive for the first time after completing my engine replacement (thread here) and I noticed that after full throttle acceleration for more than a few seconds that I would lose the ability to accelerate. I could still easily maintain speed, but throttle response was almost nonexistent. No check engine light appeared.
This happened twice: first time it happened was accelerating up a fairly steep bridge, second time was overtaking on the highway. Both were around 70-80 mph. Restarting the car after coming to a stop resolved the issue both times.
Typical symptoms for leak in intercooler system, who might show as oily residue around it.
The code triggers soft limp and if continued, it will trigger CEL.
Either way, coffee grinds are not the best for troubleshooting those vehicles, so better get a scanner.
I've got a brand new intercooler and one new charge air pipe. The other new one kept popping off (it's aftermarket, sadly FCPEuro doesn't have an OEM one for that side) so I went back to using the old one, which seems to have a small crack in it so I bet that's the issue. Hooked up my scan tool earlier to confirm:
Thanks all for your quick replies! I'm going to try fiddling with the clips on that new aftermarket charge air pipe and see if I can get it to stay on, I bet the old one is leaking thru the crack. It's a bit oily in that area.
Got my new charge air pipe and it was definitely that. The old one had multiple cracks, I'm surprised I was getting any boost at all. Much less turbo noise (sadly, I like turbo noises) but WAY more power! Almost no hesitation off the line either, very nice!
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
