Rust, Body, Paint & GlassDiagnostic helpCommunity Starter

1987 Porsche 911 — surface rust underneath a winter daily

ColdStartFan202Community StarterFeb 26, 20261987 Porsche 911 Carrera 3.2Columbus
There is early surface rust on brackets, fasteners and seams underneath, but nothing structural. For a salt-belt car, what treatment slows it down without creating a hard coating that traps moisture? If I figure it out I will update the thread.
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7 replies

QuietFanCommunity StarterCommunity StarterFeb 26, 2026permalink
If it were in my driveway, loaded-suspension checks on the 1987 Porsche 911 catch play that a wheels-hanging inspection misses. Save the big job until that test fails. This is from a 1987 Porsche 911 in Columbus. Learned this the expensive way on a previous car. I'll update if anything new shows up.
DailyGeek732Community StarterCommunity StarterFeb 26, 2026permalink
Ask what changed right before it started. Get a real battery/charging test on the 1987 Porsche 911, not just resting voltage, before blaming a module. You'll know quickly if you're on the wrong tree. A shop burned me once by skipping that step. Wrote this up on my lunch break.
QuietFanCommunity StarterCommunity StarterFeb 27, 2026permalink
Intermittent stuff lies if you only catch it once. Two 1987 Porsche 911s can feel identical and have different causes, so measure before you copy someone else's repair. You'll know quickly if you're on the wrong tree. On “surface rust underneath a winter daily,” that was the fork that mattered for me. Had a similar mess a couple years ago and that's what finally sorted it. If this is nothing, great. I want that in data.
TowOwner428Community StarterCommunity StarterFeb 27, 2026permalink
I'd want a measurement, not a hunch. A pressure test beats staring at a dry driveway if the 1987 Porsche 911 is losing coolant with no puddle. If the cheap test changes it, stop and reassess. Keep sale price, fees, and rate as three different conversations. I'll poke at it this weekend.
HybridDetailer348Community StarterCommunity StarterFeb 27, 2026permalink
Not convinced that's the whole story. Move a coil or plug on the 1987 Porsche 911 if it's cylinder-specific and see whether the code follows. You'll know quickly if you're on the wrong tree. Had a similar mess a couple years ago and that's what finally sorted it. If that fails I'll eat the diagnostic fee.
ColdStartFan202Community StarterCommunity StarterFeb 28, 2026permalink
Checked the easy stuff on the 1987 Porsche 911 and found one clue worth chasing before I book a shop. I refuse to clear codes until someone else sees them.
QuietFanCommunity StarterCommunity StarterFeb 27, 2026permalink
Start with the test that can prove you wrong. Swap the cheap/easy piece first on the 1987 Porsche 911 and see if the fault moves. That's the branch I'd chase this week. Had a similar mess a couple years ago and that's what finally sorted it. This is me being the wet blanket on purpose.
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