In todays video, I'll be demonstrating how to fix a high/surging/erratic idle associated with check engine light codes P0505 and P1129. I'll show you how to fix these issues on my 2002 Acura TL-S with 350,000 miles. In my scenario, I had a faulty IACV that was causing both of these codes.
It is possible for some of these tests to pass despite the part being bad. For example, the IACV could pass the vacuum and tapping tests but fail the throttle body port plug test, or the EGR valve could pass the ohm test, but fail the piston test. So make sure you watch the entire video and perform all of the tests before purchasing parts to ensure you know what the problem is and don't waste money on unnecessary parts.
If you replace a part and the problem persists, don't forget to retest that new part you just put in because it is possible the replacement part is bad.
Some of the causes for these issues include:
- Bad Idle Air Control Valve (IACV (Most common))
- Bad Manifold Absolute Pressure (MAP) sensor
- Air in the coolant system
- Bad Throttle Position (TP) Sensor
- Bad Positive Crankcase Ventilation (PCV) valve
- Bad Exhaust Gas Recirculation (EGR) valve
- Leak in Motor Mounts
- Vacuum leak
Find your Honda/Acura parts, part numbers, and vehicle fitment info here:
acurapartswarehouse.com
hondapartsnow.com
Find a junkyard part here:
car-part.com
Parts and Tools used in this video:
- Idle Air Control Valve (IACV) - 16022-P8A-A03 (Denso MX136800-1011)
- Manifold Absolute Pressure (MAP) sensor - 37830-P8E-00 - (Denso TN079800-5310)
- Positive Crankcase Ventilation (PCV) valve - 17130-PY3-003
- Exhaust Gas Recirculation (EGR) valve - 18011-RCA-A00
- Honda Type II Coolant - https://amzn.to/4jjbeN3
- Ancel AD310 OBD II Scanner - https://amzn.to/3Egy7Ar
- KAIWEETS HT188A Digital Multimeter - https://amzn.to/42oPtoN
- Test Lead Set & Alligator Clips - https://amzn.to/3C7YRTj
- Mityvac MV8000 Vacuum Pump - https://amzn.to/4jjbonD
- FEL-PRO 61319 Throttle Body Gasket - https://amzn.to/3PMh6k8
- CRC 05078 Throttle Body and Air-Intake Cleaner - https://amzn.to/40tYuKT
- Scotch-Brite Heavy Duty Scour Pads - https://amzn.to/4apUXl8
- 10mm x 2mm o-ring - https://www.napaonline.com/en/p/BK_7272606
- ANCEL S3000 PRO Automotive Smoke Machine - https://amzn.to/4g6Xq5w
- Johnson & Johnson Baby Oil - https://amzn.to/42oEXxZ
0:00 Intro
0:33 Purchasing parts
12:33 Bleed air from coolant system
13:27 IACV vacuum and tapping tests
16:57 Remove air filter housing and VSA-TCS control valve to reach IACV
19:08 IACV port plug test
20:19 Remove throttle body
21:10 Replace IACV
22:16 Clean throttle body
24:27 Replace throttle body gasket
25:41 Install throttle body (torque to 16ft.lbs)
26:09 Install VSA-TCS control valve (torque to 16ft.lbs)
28:21 Install air filter housing and manifold cover
29:43 MAP sensor tests
33:14 Replace MAP sensor
34:15 TP sensor tests
36:09 PCV valve test/replacement
36:52 EGR valve tests/replacement (torque to 16ft.lbs)
38:57 Motor mounts vacuum test
40:13 Smoke test
42:13 Conclusion