2013 impala idle surge
03-05-2021, 10:58 PM
#1
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2013 impala idle surge
Idle surge after installing new transmission
Problem did not exist before fall and new trans installation
Engine and cradle fell from car while on lift
Damaged intake and throttle body.
Tore three wires that were repaired.
Brwon wire
Purple wire
Grey wire
Not sure where they went to, but do do know they tie into a harness connector on drivers side strut tower. They were repaired.
Intake replaced
New AC Delco throttle body
New map sensor
New maf sensor
AC Delco throttle body warrantied because idle surge persisted after replacement. Problem persisted
Codes set once but have not came back.
Codes were :
P11c2-00 intake air humidity sensor low voltage
P2227-00 barometric pressure sensor performance
P2228-00 barometric pressure sensor low voltage
P0097-00 intake air temp sensor 2 circuit low voltage
Po102-00 Maf sensor, circuit low frequemcy
P0113-00 intake air temp sensor high voltage
U0100-00, lost comm. With Ecm
U0101-00 lost comm. With Tcm
Every harness was properly plugged in when code set.
The codes have only set once, and have yet to come back
Have driven for three days without codes coming back.
Problem is intermittent but tends to show itself upon start up, switching from park to gear or vice versa. Also, sometimes shows itself during ac engage or disengage.
Once problem starts it usually persists for a short period, then runs normal for an equal time period, then back to surging Untill. Turning car off and restarting
Short and long term fuel trims look great while issue is active short term bank 1 and 2 = - 3 to 0 %
Long term bank 1 and 2 = - 9 to - 8 %
On top of monitoring fuel trims system has been smoke tested.
No sign of vacuum leaks.
Manual. And electronic idle learn procedures have been performed.
Verified good grounds on engine, chassis, and body. Even added some for extra measure.
Any thoughts would be greatly appreciated.
If you need any extra info please let me know.
I have multimeters, power probes, and a good scan tool.
Problem did not exist before fall and new trans installation
Engine and cradle fell from car while on lift
Damaged intake and throttle body.
Tore three wires that were repaired.
Brwon wire
Purple wire
Grey wire
Not sure where they went to, but do do know they tie into a harness connector on drivers side strut tower. They were repaired.
Intake replaced
New AC Delco throttle body
New map sensor
New maf sensor
AC Delco throttle body warrantied because idle surge persisted after replacement. Problem persisted
Codes set once but have not came back.
Codes were :
P11c2-00 intake air humidity sensor low voltage
P2227-00 barometric pressure sensor performance
P2228-00 barometric pressure sensor low voltage
P0097-00 intake air temp sensor 2 circuit low voltage
Po102-00 Maf sensor, circuit low frequemcy
P0113-00 intake air temp sensor high voltage
U0100-00, lost comm. With Ecm
U0101-00 lost comm. With Tcm
Every harness was properly plugged in when code set.
The codes have only set once, and have yet to come back
Have driven for three days without codes coming back.
Problem is intermittent but tends to show itself upon start up, switching from park to gear or vice versa. Also, sometimes shows itself during ac engage or disengage.
Once problem starts it usually persists for a short period, then runs normal for an equal time period, then back to surging Untill. Turning car off and restarting
Short and long term fuel trims look great while issue is active short term bank 1 and 2 = - 3 to 0 %
Long term bank 1 and 2 = - 9 to - 8 %
On top of monitoring fuel trims system has been smoke tested.
No sign of vacuum leaks.
Manual. And electronic idle learn procedures have been performed.
Verified good grounds on engine, chassis, and body. Even added some for extra measure.
Any thoughts would be greatly appreciated.
If you need any extra info please let me know.
I have multimeters, power probes, and a good scan tool.
03-06-2021, 11:37 PM
#2
Senior Member
True Car Nut
Trace all wires that were connected to anything that fell, and physically trace them from end to end. I bet you'll find damage.
Did you do this work yourself or did all of this happen at a shop?
Did you do this work yourself or did all of this happen at a shop?
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