My 2003 Buick Rendezvous has a problem starting on a hot day after it has been running. It starts then immediatly stalls. I have to wait anywhere from 1/2 hour to 3 hrs depending on how hot the or when in the winter if i drive about 3 hours or more then turn the car off , it won't start!

are you getting fuel or just changed pump because it died ---try starter fluid if starts --recheck fuel pump--relay for power --connections to pump -new doesnt mean free from defects or improper installation no start test for spark -

Engine, transmission or electrical problems will all do this. You need to have the codes scanned.

could be module problem in distributor or a fuel problem.

Hi! Have you checked the fuses under the hood with a test light first?

batterys shot should replace it

The actuator that 'blends' cold with hot is stuck in the cold position. There are a couple of options. Disconnect the battery, then drive the vehicle around without using the AC for 10 min, if the AC is defaulted to come on after a battery interuption, then shut the car down then turn it on again. You are trying to get the electronic actuator to reset and resume proper function. Another option is to try this: Start the car, adjust the pax side full hot, drivers full cold, wait 30 sec then shut car down, then start car back up and reverse the settings, pax full cold, drivers full hot. In both solutions, the vent actuators are stuck at either the full open or full closed, so you are trying to get it to 'self check' and allow them to resume proper function. After two years, I simply removed them altogether since I live where it is hot an only need cold.works just fine....

the car buick rendevous cx 2003 had started up by it's self
came out of my house the car was running?

do u have any fault codes in the computers memory? sounds like u may have an ignition problem, go to Autozone or Kragen and ask for a OBD 2 fault code test, it is free, post the results back here for me to look at.

a bad fuel pressure regulator will cause this, the vehicle runs rough, the engine will not start (usually in the mornings) many times engine starts then stalls. a bad regulator can result in fouled spark plugs. also get it scanned to see if the crank or cam sensor is bad. if crank sensor fails there will be no starts. check these out.

Might try a new fuel cap.