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97 Seville STS
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22 Posts
Discussion Starter #1
When we turn the car on, it runs smooth and nicely. After it warms up,it runs like a bag of crap. The code set is E30 - ISC RPM Out Of Range.
Where would you start to troubleshoot this issue? Thermostat? EGR? Other?
Any and all help appreciated.
 

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76 Eldo (54k), 76 Eldo (52k), 78 Eldo (9k), 85 Deville (43k)
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668 Posts
EGR is probably sticking and the ISC is trying to compensate by raising the idle. I'd start there.
 

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When we turn the car on, it runs smooth and nicely. After it warms up,it runs like a bag of crap. The code set is E30 - ISC RPM Out Of Range.
Where would you start to troubleshoot this issue? Thermostat? EGR? Other?
Any and all help appreciated.
i wouldnt replace the EGR unless you replace it with a delco part, MOST aftermarket EGRs are crap.. just plug the vacuum line going to the egr with a golf tee for now to eliminate it as a possibility...

if the car is running liek crap after it warms up, that means you have a bad sensor somewhere most likely...a bad isc motor is just gonna make it idle high or low...have you ever replaced the O2 sensor(s) on the car? i would start there if they are the original O2 sensors, its time to replace them anyways if they are the orginal..
 
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