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If the "distinctive smell" is gasoline, your problem may be fuel fumes from the trunk. I had this problem. There are a couple of possible sources:
1. Fuel filler neck where it enters the trunk. The neck goes down into the tank and is secured by a clamp. It enters the trunk through a hole secured by a big rubber seal.
2. Just inside the rear quarter panel, the filler neck has a nipple for a rubber vent tube that leads to a steel tube and I assume eventually to the vapor recovery canister. If the rubber tube comes of you can get gasoline vapor in the trunk.
3. Fuel door seal where the filler neck passes through the quarter panel. If this seal is bad, a leaky fuel cap could conceivably allow vapor into the trunk.
4. Fuel spillage drain. The fuel door seal has a catch basin and hose that drains overflow through the trunk to a hole in the bottom passenger side spare well (normally hidden by that d***ed fiberboard cover that always warps).
An exhaust leak large enough to cause CO sickness will normally be loud enough to hear. Leaks after the muffler or resonator may be quiet, but exhaust fumes can make it into the car only if there are holes in the floorpan, so richink's suggestion is a very good one. Another possibility may be the openings in the firewall. I've never smelled exhaust fumes through the firewall, but two of our 244s have had water leaks that I fixed with silicone sealant.
Another, even longer shot, is a coolant leak. The ethylene glycol in antifreeze makes some people queasy. Your heater core or heater control valve may be leaking. Check for damp carpet in the floorboards.
Good luck.
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'88 244GL, '89 244GL, '90 244DL, '91 244, '92 244
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