Car appears to be in limp mode

My car will go, about 30 mph and it idles fine. At idle it will not rev up, over 3,000 rpm's. When I was driving it one day it shut off on me. I replaced the battery it started up and drove fine then died again before I got home. The alternator was bad and I replaced it. The car started up and now will not go over 30 mph. It appears to be in a limp mode.

Roy, thank you for your reply. I actually took the car to Christian Brothers Automotive and they ran checks on the fuel pressure and exhaust to see if the catalytic converter†s were plugged ; checked for grounds completed a relearn on the system and they could not find anything. The ECU is not giving any codes. I do not have any check engine lights. They basically said they don’t know what it is. Before I took it to shop the car was having trouble starting. I had it towed to the shop. And now starts right up and idles fine I just don’t have any power and it will not go over 25 to 30 mph.

Thank you Roy. When I serviced the throttle bore according to the guide it fixed it I cant believe none of the shops or people I took it too knew this? Thanks

The car is constantly being put into limp mode with a U0107 Code. I have replaced the TPS mounted on the firewall and the entire Throttle Body but I still get the code and subsequent limp mode. As far as driving conditions are concerned it always seems to happen on the highway or shortly after leaving the highway. After changing the TB I am now at a lost as to what the problem can be since those were the only codes to be thrown out.

Please allow me to explain the 1st occurrence because I believe a little history might be helpful. The first time happened during a long drive from New York to Miami. I made it all the way to Jacksonville (approximately 1000 miles) nonstop only to refuel with no problems and all of a sudden LIMP MODE. Right before the car went into limp mode, I started to feel cold AC water drip on my drivers pedal foot. I believe that was from an EXTREMELY clogged and dirty air filter overworking the AC as opposed to a clogged drain. After changing the AC filter I have not had that problem. The car gave two codes. The first was P2138 and the second was U0107. I unplugged the battery, checked into a hotel, and finish the trip to Miami in the morning. Those were the only two codes to ever show up on the generic readers.

I have tried searching your site for problems specific to mine but couldn't come up with anything resembling it.

First I would like to thank you for such a prompt response but I also have to apologize for including that I changed two parts I thought were related to the reoccurring U0107 code. The first one was the APP sensor right on the firewall and then the Throttle Control Body. Both parts are brand new from the dealer, but I am still getting the code as indicated usually on the highway without running the AC. The P2138 code has never shown up up again but the U0107 seems like a 7-10 occurrence. I just want to make sure if there is another related part behind the gas pedal itself? And I am also curious, is there a separate relay for either of those two components that could be shorting out? Also my car is the 2.4 Liter if that makes a difference.

When car is started the green sports light comes on and remains on. There is a ticking sound that also occurs that one can easily hear comiing from under the hood of the car. Sound is not there when driving. However, there is no transmission change. Took car to transmission place. They could not read the codes, told me car is in "fail safe mode" and will not change gears. They think it might be an electrical problem. Battery, alternator all new. Battery 3 months old, alternator 3 months old. Practically everything under the hood has been replaced. Do you think this is an electrical problem?

You need a new TCU. Trasmission control unit. I replaced one in my 1990 Accord and it worked perfectly.