[M.A.C]

Originally Posted by pleptuch

Has anyone else had problems with the fuel injection system on Eldorados? Could the 89 octane for a few months have messed up the fuel injection system? Seems like octane only would matter during the combustion process within the cylinders) Can I expect the car to run properly now? What else possibly could I have to fix?!?! There are no error codes, and I change the fluids regularly.

I have never heard of a fuel pressure regulator being replaced twice with under 100K miles. I replaced my FPR at about 190K. Sounds fishy—I hope you didn’t pay for an unnecessary part. The last repair was a couple of weeks ago when I replaced the left front hub assembly with an ACDelco/GM part costing about $180. I replaced it myself so I saved a couple of hundred dollars labor.

Originally Posted by pleptuch

I also had problems with the traction control/anti-lock lights coming on, and the shop replaced the sensors - rear, both sides, twice each before the lights went off for good. They put in aftermarket sensors the first time and the problem persisted. Now they'll only put Cadillac parts on. Anyone else have problems with putting aftermarket parts on Caddy's?

Yes. Aftermarket parts tend to be a waste of money as they are often inferior quality compared to OEM parts. I have had a number of problems with aftermarket parts. If you ask the same question at other Cadillac forums I’m sure you will get the same response. However, some aftermarket parts tend to be up to par with OEM, such as quality brake pads—not the cheap $20 pads. But some aftermarket parts such as oil filters may be inferior. I use ACDelco oil filters because they are tested and validated by GM. The same goes with other ACDelco parts. Aftermarket parts are not tested and validated. Are all aftermarket parts poor quality? No. However, I would recommend using OEM replacement parts because, generally speaking, aftermarket parts tend to be inferior quality.

Originally Posted by pleptuch

Could the 89 octane for a few months have messed up the fuel injection system?

Using 89 octane will not damage the fuel injectors. In fact, your Eldorado, like mine, has an anti-knock feature, which allows the Northstar to run on regular gas. So don’t waste your money with 92 octane. If you feel better using 92 octane, fine. But it’s not necessary.

Originally Posted by pleptuch

The car has been garage kept since new and looks nearly brand new and is fast, smooth and fun to drive when it works. I was hoping to put 150-200K miles on it without a ton of major repairs. It sucks when a car looks so nice but has problems. Has anyone ever gotten over a hump of repairs to have smooth sailing?

Sometimes, there simply is no explanation as to why some cars of the same model and year will be reliable for well over 100K miles, while others will be nothing but a giant headaches. Let’s hope that you turned the corner with your latest repairs and from here on out you will have nothing but smooth driving. Eldorados are nice cars—powerful, good looking, and fun to drive.

Good Luck!