I have a 2005 GT with approximately 117k miles. The car is used as a primary vehicle for our family. We are the original owners. I want to update a number of things in the hope of prolonging its life and bring back some of its original power (if not making it better). Below is a list I have come up with:
1. Clean throttle bottle - I've done this once or twice during the course of the car but it's been at least a year since the last cleaning.
2. Clean MAF valve - This has never been cleaned and I'm not even sure exactly what it is. I just saw mention of it while researching these forums. Where/what is it exactly and how is it cleaned?
3. Replace PCV valve - Never been replaced.
4. Clean fuel injectors - I've used seafoam in the gas from time to time but it's been at least 6 months. I'm planning on trying Gumount with Regane...how many treatements/tanks? I've also tried running seafoam through a vacuum hose in the past. After further research, this may not be the best idea either. I'm thinking of spraying cleaner into the throttle body (maybe something that foams or seafoam in the spray can)?
5. Spark plugs - I just replaced them (along with the spark plug wires) last fall. If I remember correctly I used AC Delco Irridium plugs (and they were pre-gapped). Is this a good choice or should I replace them with something else.
6. The oxygen sensor has never been replaced...do I need to? Is there any way to clean it?
7. I've never replaced the main drive belt....does it need to be replaced?
8. I just replaced front brakes and rotors (for the second time) and the back have been replaced once. The brake fluid has never been bled so I plan on doing this.
9. I replaced the coolant last year. The hoses never have been replaced though.
10. I need to replace cabin air filter. It's been replaced once but not in a couple of years.
11. The power steering fluid has never been replaced? Do I need to do so and if so, how?
12. I replaced the transmission fluid last year. It was WAY over due. I also replaced the filter and gasket (dropped the pan). The transmission has slipped from time to time since then from first to second. I just checked the fluid and it was low so I just added some. I'm thinking we'll see if that was the issue. Should I replace the fluid again?
13. I've always just used regular air filters. I would like to try making a basic intake with a spectre filter. Will this benefit me in any way? I know it makes the supercharged Grand Prixs sound better...what about a GT?
14. I've always just use Penzoil 5W-30. Should I start using synthetic or maybe use a high mileage formula?
15. Should I be worried about any gaskets specifically? What should I be looking for?
16. There are no ball joints, tie rods etc to grease, correct?
17. The exhaust system is original...is it time for new? How do I inspect?
18. The struts are original and the ride is REALLY rough. When I push down on the front and back it bounced a couple of times which doesn't seem bad. I would imagine it's time for new though?
Have I missed anything? What else should I be concerned with? Any other mods I can do without going crazy?
Thanks in advance!
