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Car surges when A/C is on

Tiny
JOE DERRETT
  • MEMBER
  • 1995 NISSAN SENTRA
  • 4 CYL
  • 2WD
  • MANUAL
  • 140,000 MILES
If I turn my A/C on my car surges. I've replace injectors MAF sensor, throttle position sensor, computer, fuel filter, checked vacuum leaks and complete A/C system. Still surges and 7 km per liter. What am I missing?
Thursday, August 8th, 2019 AT 5:20 AM

10 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

Are there any codes?

If you have an EGR valve not seating, it could do this issue.

https://www.2carpros.com/articles/engine-surges

Roy
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Thursday, August 8th, 2019 AT 5:55 AM
Tiny
JOE DERRETT
  • MEMBER
  • 7 POSTS
My car has no EGR valve so mechanic suggested new fuel pump. So I had him replace that. Still surging I'm really getting frustrated now.
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Tuesday, August 20th, 2019 AT 8:17 AM
Tiny
ASEMASTER6371
  • MECHANIC
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The fuel pump will not do this.

I would think that the injectors may be varnished up. Additives have no effect on the cleaning out of the varnish.

You need to have someone disable the fuel system and hook up a gauge and use cleaner directly into the fuel rail and run the engine on it until the can is empty. Then see if it still does it.

Roy
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Tuesday, August 20th, 2019 AT 8:55 AM
Tiny
JOE DERRETT
  • MEMBER
  • 7 POSTS
Injectors are brand new.
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Tuesday, August 20th, 2019 AT 8:36 PM
Tiny
ASEMASTER6371
  • MECHANIC
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What else have you done.

Roy
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Tuesday, August 20th, 2019 AT 9:05 PM
Tiny
JOE DERRETT
  • MEMBER
  • 7 POSTS
Injectors, fuel pump, MAF sensor, throttle position sensor, comp, plugs, wires, cap, rotor all new gadgets, fuel filter.
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Wednesday, August 21st, 2019 AT 2:46 AM
Tiny
JOE DERRETT
  • MEMBER
  • 7 POSTS
Injectors, fuel pump, MAF sensor, throttle position sensor, comp, plugs, wires, cap, rotor all new gadgets, fuel filter and checked for vacuum leaks.
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Wednesday, August 21st, 2019 AT 2:48 AM
Tiny
ASEMASTER6371
  • MECHANIC
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You either have a vacuum leak or possibly the catalytic converter may have a restriction.

A lot of parts with no result.

Roy
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Wednesday, August 21st, 2019 AT 11:58 AM
Tiny
JOE DERRETT
  • MEMBER
  • 7 POSTS
Well it's fixed Roy. The IAC was carboned up so took throttle body off cleaned the IAC and all the carbon throughout the throttle body and it is now running perfect again.
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Thursday, August 22nd, 2019 AT 5:31 AM
Tiny
ASEMASTER6371
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Good find.

Roy
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Thursday, August 22nd, 2019 AT 6:25 AM

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