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2003 Seville sporadically dying after start due to low idle. No code shown.

1641 Views 7 Replies 3 Participants Last post by  Submariner409
Thank you in advance for any advice on this issue, I'm not very knowledgeable about cars in general but have learned a lot in the past year with the help of a few car savvy friends.

The title pretty well sums up my issue. My 2003 Seville is dying after start up, I've had one code pop up after the 3rd or 4th time of dying (p0507) but after checking it, it was cleared by the auto parts store I went to. It has not given a code since that day despite still having issues.

The car has never died at speeds of 30mph or higher and I've gone weeks without an issue then it'll happen again. Sometimes the idle is higher than it should be and sometimes it dies. I've had it die twice on the way to a repair shop in the morning and in two days of having it they couldn't get it to die once. (Luckily they didn't charge me a dime.)

For quick reference p0507 states

Code Definition: Idle Speed High

Possible Causes:

-Engine Vacuum leak
-Idle Air Control has failed
-MAF sensor is dirty, "skewed"
-PCM has failed
-Throttle plate, throttle shaft or linkage is damaged or sticking
-TP Sensor is out-of-ranged or Skewed high

Thank you for any advice!
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Re: 2003 Cadillac Seville sporadically dying after start due to low idle. No code sho


If it only dies at idle, I'd first start with a good TB cleaning.
If it dies while off idle (driving), you might replace the CKP sensors if they are original.
As for vacuum leaks, check the PCV grommet in the rear cam cover and all other vacuum lines.
The plenum duct is a possibility, but it should set a DTC.
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