I. My wife has an 03 PT Cruiser we bought new and that she absolutely loves, which means I have an ongoing problem problem. A while back the check engine light came on and it began stumbling under acceleration. It also got so that it would not up shift to the next gear at more than about 1/4 throttle until we let up on it then it shifted normally.
So.I did the "key dance" to get the codes and found the problem to be plugs. I replaced the plugs and wires while I was at it, started it, took it for a test and all was well. It accelerate smoothly and even shifted under heavy acceleration as it should have. She drove it a few times, the check engine light went out and all was well.
About a week or so later, we got in it to go somewhere and I noticed it was surging under acceleration. We got onto the interstate and up to speed, 70 MPH or so, for about 5 miles and the car began to sputter and slow down to the point that I thought it had died and pulled over to the emergency lane. It hadn't so we did a U-turn to get another vehicle. The car actually ran fine back to the house.
SO.I did the key dance again and this time there were NO CODES that showed up. So she has continued to drive it with no more problems. Until today, she complained again so I test drove it. It seems to be surging or stuttering at any constant speed. It accelerates well and normally, but surges at a constant throttle position. And the problem of not up shifting under heavy acceleration has returned. As long as you baby it. It stumbles, but shifts normally. Push it and it sounds like it will sling the hamsters right out of their treadmills before it would shift, but the miss goes away.
SO. Again I do the key dance and STILL no codes.
Have you encountered anything like this? I've considered everything from O2 sensors to plugged up Cat converter, but I THINK those things would throw a code. I'm kind of at a lose as to how to proceed. It IS a 11 year old car with 150,000 miles after all. However, we are in a position where we don't want to buy a new car for a few more months. ANY help would be a BIG help. Thank you.
have the same problem?
Sunday, May 4th, 2014 AT 5:44 PM