High idle popping and back fire

Tiny
A1HI
  • MEMBER
  • 2005 CHRYSLER PACIFICA
  • 3.5L
  • V6
  • FWD
  • AUTOMATIC
  • 145,000 MILES
Replaced the spark plugs and rocker arm assembly cleaned mafs, to get to plugs had to remove air intake and coil on plugs. I started it had high idle then it would go down and fluctuate up and down some popping and backfire. When I installed rocker arm assembly I made sure engine was on tdc. What would be the best way to repair this problem.
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Saturday, May 2nd, 2015 AT 10:29 AM

4 Replies

Tiny
HMAC300
  • EXPERT
Try driving it as the computer has to get used to new plugs if it doesn't straighten out then scan for codes and check fuel pressure with a gauge
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Sunday, May 3rd, 2015 AT 4:24 PM
Tiny
A1HI
  • MEMBER
I am getting codes

P2074 Dodge

P2074 Dodge - Manifold Pressure/Throttle Position Correlation- High Flow/Vacuum Leak

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Possible causes

- Large vacuum leak on the engine
- Faulty Manifold Pressure (MAP) sensor
- Faulty Throttle Position Sensor (TPS)
- Faulty Engine Control Module (ECM)

P0064

P0064 - HO2S Heater Control Circuit High Bank 2 Sensor 3

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Possible causes
- Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 3
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 3 harness is open shorted
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 3 circuit poor electrical connection
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 3 circuit fuse
- Faulty Engine Control Module (ECM)

Read more: http://engine-codes.com/p0064.html#ixzz3Z8K0GZ8j
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Sunday, May 3rd, 2015 AT 7:32 PM
Tiny
A1HI
  • MEMBER
I am getting voltage to mafs, removed and tested tps and idle air control thy tested good.
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Sunday, May 3rd, 2015 AT 7:39 PM
Tiny
HMAC300
  • EXPERT
If th parts tested good check for air leaks like the duct work leading to engine with holes in it or not sealed correctly to engine or after maf and check all grommets on engine causing an air leak as well. Then use choke cleaner and spray around intake and hoses for a vacuum leak. Lastly as you removed intake it may have destroyed a gasket causing your problem so check that.
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Monday, May 4th, 2015 AT 6:46 AM

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