Over the past few months, I’ve been an active writer here, sharing updates and troubleshooting issues—from oil problems to stalling, transmission concerns, and more.
Recent Fixes and Maintenance
This week, I tackled several tasks and wanted to share my progress:
PNP Switch:
- I removed the PNP switch, cleaned off the grease, and reinstalled it.
- Result: Reverse lights are working perfectly—one less problem to worry about!
Spark Plugs:
- Replaced the spark plugs with Bosch ones.
- Note: The gap is different from the original Volvo plugs, but so far, it seems fine.
Distributor and Camshaft Maintenance:
- Installed a new rotor cap and cleaned the rotor.
- Replaced both rear cam seals (they were dried out and ineffective).
- Cleaned the rear camshaft sensor, which had oil inside.
PCV System:
Almost completed the PCV system service. Here’s what I did:
- Replaced the oil trap and one hardened hose.
- Cleaned the remaining original hoses since I was missing one pipe and one hose from the kit.
- Used a wrong-sized gasket because the original was too old and I got the wrong PCV kit
.- Observations: No intake leaks so far (RPM is stable, and there’s no noticeable power loss).
Question: Should I replace all the vacuum lines as well? They’re old and some are cracking. Can I use 5mm silicone hoses and clamps to replace all sizes instead of buying 3mm, 4mm, and 7mm hoses separately? (See attached pictures for reference—yellow and black vacuum lines.)
Current Results
Since completing the seals and PCV work:
- The car is running smoothly.
- I plan to order the rest of the PCV hoses soon and will replace them later (The ones that are connected to oil trap and intake manifold).
Outstanding Concerns
Vacuum Lines:
- Will the cleaned and reused original PCV hoses cause future issues?
- Can using a different gasket long-term cause problems if there are no immediate signs of leakage?
Highway Vibration Issue:
- At speeds between 60-90 km/h, I sometimes hear and feel a vibration, especially after hitting potholes or accelerating suddenly.
- The vibration lessens as I slow down and eventually disappears but can return.
- It doesn’t occur at idle or low speeds.
- Question: Could this be caused by the tires, or is it something else?
Let me know your thoughts and suggestions. Thanks in advance for your help! Wishing everyone a Merry Christmas and a Happy New Year!
153k