ERRATIC IDLE need help deciphering CODES
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ERRATIC IDLE need help deciphering CODES
I have an ERRATIC ROUGH IDLE problem where I replace the EGR valve, IAC valve/solenoid, EVR solenoid with no improvement. This is on a 90 Bronco 351 w/ MAF conversion. No check engine light. MPG OK . Performance on freeway and hills OK.
Rough idle is initially 1200 rpm at start then comes down about 200 rpm and oscillates up and down 100-200 rpm's.
Did a KOER code scan and got these codes which has me lost because they are not failure codes of component:
15 ECA keep alive memory not working? open in the harness?
32 EVP sensor low voltage I checked the output w/ ohm meter and it varies as pintle moves. it also holds vacuum, no leaks.
38 ITS idle track switch open I don't think it has one, can't find it. Where is it located?
41 EGO signal voltage always low (lean) doesn't switch
53 TPS voltage too high
66 MAF sensor voltage signal too low
What do you do with too high or too low voltage conditions?
What do the above codes indicate? Bad ECU? Open or shorts in the MAF conversion harness?
Any help appreciated!
Ron
Rough idle is initially 1200 rpm at start then comes down about 200 rpm and oscillates up and down 100-200 rpm's.
Did a KOER code scan and got these codes which has me lost because they are not failure codes of component:
15 ECA keep alive memory not working? open in the harness?
32 EVP sensor low voltage I checked the output w/ ohm meter and it varies as pintle moves. it also holds vacuum, no leaks.
38 ITS idle track switch open I don't think it has one, can't find it. Where is it located?
41 EGO signal voltage always low (lean) doesn't switch
53 TPS voltage too high
66 MAF sensor voltage signal too low
What do you do with too high or too low voltage conditions?
What do the above codes indicate? Bad ECU? Open or shorts in the MAF conversion harness?
Any help appreciated!
Ron
