Ran fine for 1 week and then it wouldn't start again?

2003 CADILLAC CTS
66,000 MILES • 6 CYL • 2WD • AUTOMATIC
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INDYGAL724
  • MEMBER
  • 2 POSTS
Replaced MAF sensor 1 week ago because that code came up on scan tool. Ran fine for 1 week and then it wouldn't start again. Car won't start except when I use starting fluid, then after it burns off the starting fluid it runs normal. Sometimes it starts normal with no problem and then it's back to needing starting fluid once again ??????? THANKS
Oct 26, 2009 at 8:23 PM
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SQM
  • ✓Experienced Mechanic
  • 6,383 POSTS
Hello,

So, the issue is fuel delivery.
It could be due to an inoperative fuel pump, faulty fuel pressure regulator, it can also be due to a clog in the fuel line.
When you turn the key to the on position, can you hear the fuel pump prime for a few seconds?
If the pump is not working, then it could be due to a bad pump or a faulty relay.
First check the fuel pump relay.
Fuel pump relay is located in the right rear fuse block. The rear fuse block is located in the trunk. See diagram below.

Take a look at this helpful guide:

https://www.2carpros.com/articles/car-not-running-advanced

Let me know what you find or if you have any questions.
Thank you.
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Aug 10, 2022 at 10:42 AM
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