Originally posted by linky:
here's whats happen'n, when i start the car it revs up high and does'nt come down to correct idle till car gets warmed up, suspected iac, but cleaned and tested and seamed to be working fine. when starting to drive throttle starts to run away,reving high without downshifting and when it does downshift it slams into gear, got code542 and was going though troubleshooting for faulty fuel circuit, changed fuel pump and front o2 sensor, checked all electrical grounds. test circuit was fine. could this be a bad fuel pressure regulator? what are signs of a bad fpr. also car wants to overheat once in awhile, suspect bad cooling temp sensor,could this have a effect on wy the throttle all over the place.



With the car overheating there are a few more likely things you should try first...

1. is the thermostat stuck open? That is the most likely cause for a car to overheat, people dont chnag them when they change the coolant like they should

2. You stand by the hood of the car and grab the top radiator hose, while someone else starts it, you should fell a surge of coolant, if you dont then the water pump has failed and that is cauisng overheating

3. Have you had your cooling system flushed within 24,000 miles

4. One of your hoses, or heater core, or radiator may be plugged a flush will take care of that though

If none of those fix the problem let me know


It sounds like your fuel pressure regulator like you said has gone bad, that is why is revs up high for, nothing is controlling it