I have a 2004 Hyundai Santa Fe with just under 97,000 miles on it. It’s a V6, 3.5L, AWD. I’m the second owner (parents were the first).
About two weeks ago I was driving down the highway during morning rush hour and the car seemed to loose power. (but not like it does when the alternator goes) and I had to pull over. The car wouldn’t go faster then 40MPH. I finally pulled back out into traffic and got to work.
Checked the coolant - bone dry. Filled up the coolant and it seemed to work. (also added power steering fluid as that was low as well) Friend checked and replaced the gasket on the upper radiator hose.
Few days later, same type of problems. Took it another friend. Replaced the gasket properly this time, found a tiny pin-prick hole in the upper radiator hose and fixed that.
Few days later, same problem with driving speeds. He did a read and it came up saying “Throttle Position Sensor” so after five junkyards, he found a replacement sensor. Test drove it after he fixed it and it was fine til after a few minutes. It wouldn’t go above 20mph…even with the gas pedal to the floor. Lights, heat, radio…everything else worked.
I also had a bit of trouble starting it when I pulled over yesterday (after him replacing the sensor). I revved the engine when I started it and it started but the check engine light came back on. And even with the gas pedal to the floor, it just wouln’t go.
He talked to some friends and did some research. They seem to think it’s going into “Limp Mode”. The car has trouble accelorating past 20 and does “okay” on side streets where the speed limit is lower…but has a hell of a time getting up to 25mph.
My next move is to take it to a local shop to see whats wrong with it. (one he trusts that won’t rip me off). All the research I’ve done hasn’t really given an answer. I’m not sure if it’s something that “could be anything” or if I really need to take it to the Dealership…