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1989 Fleetwood Brougham d'Elegance|2018 Chevy Colorado Z71
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6,421 Posts
Discussion Starter #1
Noticed some ride issues with my 89 recently. At highway speeds coasting downhill the car rides rather nicely as it should, but climbing a hill makes for a vibration that's easily felt. Where do I start looking? Diff? U-joints?
 

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1926 Model T street rod, 2000 Jaguar XJ8, 1999 Corvette.
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6,737 Posts
Climbing a grade stresses the engine so I'd start with plug wires or plugs themselves unless they're less than 2 years old.
 

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1926 Model T street rod, 2000 Jaguar XJ8, 1999 Corvette.
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6,737 Posts
Age on plugs tells us nothing. How many miles in 5 years. In contrast, plug wires deteriorate over time.
 

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1989 Fleetwood Brougham d'Elegance|2018 Chevy Colorado Z71
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6,421 Posts
Discussion Starter #6
I drive the car an average of 3k/yr maybe. so 15k on these plugs, somewhere around that. Wires could be older.
 

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1926 Model T street rod, 2000 Jaguar XJ8, 1999 Corvette.
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6,737 Posts
Assuming plugs are A/C Delco or Champions, I would only replace the plug wires simply because of age.
 

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1926 Model T street rod, 2000 Jaguar XJ8, 1999 Corvette.
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6,737 Posts
Get some dielectric grease as well. spread some inside the cable boots. Easier to remove next time.
 
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