Rough idle/running 15 minutes after shutdown
#51
DINOSAURUS BOOSTUS
Expert Gearhead
My first thought to reading that you may have solved it with a MAF and IAC is a little skeptical, thinking a bit further though......
The MAP sensor is the actual sensor reading that the change in EGR flow isn't sufficient. The pcm expects to see a certain change with various EGR positions and doesn't. To do this it must be using the MAF airflow info to expect a certain pressure then add the EGR opening to expect a slight change in pressure from what the calculations tell it to expect from the MAF readings.
If the MAF readings are false, then the map will not be able to read properly and potentially give a code for something that isn't actually happening.
Hopefully you got the problem solved.
The MAP sensor is the actual sensor reading that the change in EGR flow isn't sufficient. The pcm expects to see a certain change with various EGR positions and doesn't. To do this it must be using the MAF airflow info to expect a certain pressure then add the EGR opening to expect a slight change in pressure from what the calculations tell it to expect from the MAF readings.
If the MAF readings are false, then the map will not be able to read properly and potentially give a code for something that isn't actually happening.
Hopefully you got the problem solved.
#53
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Like you said Dan, we eliminated all the free and easy stuff. If I had bought parts right at first, you know I'd still be chasing wires and would've re-crimped the problem AFTER the $180.
#54
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I'm going to clear the codes again and see what happens- but it was butter smooth the rest of the day. I know I got it now. I do not know that the IAC was bad- I just changed it anyway- I believe it was working fine but I am approaching 98k miles on this black beauty=so gonna have to feed it at some point. Good learning experience for me, but doubt it would help anyone else too much.
#55
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Morning update- No SES light, no blips quirks or sniffles.no more sputters- I ran the snot out of it this morning- was running late to work- This black hotrod is humming along!
100% positive she be well again!
I'll call this one a wrap!
100% positive she be well again!
I'll call this one a wrap!
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