I recently (last summer) had my 99 LTC get engine work at a shop, to replace head gaskets (and plane heads), oil pan and gasket, rear main seal, timing chain and tensioners, and valve cover gaskets. Rationale being stop oil leakage primarily from the head gaskets leaking onto the exhaust, which I'd smell on vent coming to stops. The shop wound up replacing an exhaust manifold as well, I suppose the original broke in removing the engine.
Since the repair, if there's any oil leakage remaining it's minimal enough I don't breathe in oil at red lights anymore.
But the car now has a new behavior. On cold starts only, such as the first start of the day or after sitting for a few hours, a few seconds after startup there's a strong crisp burning smell through the vents that lasts for about fifteen seconds, it's almost like gasoline, nothing like antifreeze or oil. It doesn't reoccur on restarts. It didn't do this before the repair.
If it's burn-in smell from the new manifold it hasn't diminished at all despite it being several months since the repair.
The car still has the original plastic intake manifold. I don't see any obvious or significant antifreeze leakage, although the smell is nothing like antifreeze.
I'm under shop warranty and I do intend to take it back soon for their opinion / ideas and check if any oil leakage is reoccurring where repairs had been done. I'm wondering if anyone has any similar experience with this issue to know what's likely the cause of the burning smell.... thanks.
Edited by 46Mod99 (01/11/22 10:14 PM)
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