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C7 cat acert runs erratic when not in cold mode
06-13-2018, 05:36 AM
Post: #1
C7 cat acert runs erratic when not in cold mode
Hello all I am working on a c7 engine sn kal31337 and have replaced injectors and heui pump, the timing sensors and ecmdue to the ecm voltage droping under a load. The truck dose not misfire any more but when it comes out of cold mode the sound of the engine changes and you can't control the throttle. Fuel pressure is at 68psi steady coolant temp is 140 and the ecm is reading the same as the same as temp gun. Is there a possibility that the new ecm could have a corrupt file due to the information used out of the old ecm? Any thoughts or help would be greatly appreciated. Thanks in advanced
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06-13-2018, 07:29 AM
Post: #2
RE: C7 cat acert runs erratic when not in cold mode
1. check ECM active code
2. check Engine speed sensor (Low and up), you may exchange them, maybe you plugin wrong
3. replace ECM
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 Thanks given by: Redman550
06-13-2018, 03:43 PM (This post was last modified: 06-13-2018 03:48 PM by Redman550.)
Post: #3
RE: C7 cat acert runs erratic when not in cold mode
(06-13-2018 07:29 AM)jokey Wrote:  1. check ECM active code
2. check Engine speed sensor (Low and up), you may exchange them, maybe you plugin wrong
3. replace ECM

No active codes
Will switch wires on timing sensor's in the morning
Just replaced the ecm with a new one two days ago
I will report back in the morning
Thanks for the help
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06-15-2018, 03:41 AM
Post: #4
RE: C7 cat acert runs erratic when not in cold mode
Maybe check or change the IAP sensor?

If it's not broke...then don't fix it
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 Thanks given by: Redman550
07-22-2018, 07:20 AM
Post: #5
RE: C7 cat acert runs erratic when not in cold mode
Sorry that it has been so long getting back to this just wanted to tell you that we went back and reset the computed timing and that took care of all the drive ability problems thanks for all the help and suggestions
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 Thanks given by: Nitrous383 , Koecon
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