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Power surge when heater motor is on

When heater is turned on while truck is idling, power surging sometimes results, as well as when the truck is being driven while heater is on, a slight erratic power loss and accompanying noise happens.

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  • Toyota Master
  • 1,449 Answers

Check the drive belts may need tightened.

Posted on Dec 30, 2013

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 9 Answers

SOURCE: slight rough idle, an occasional

sounds like TPS or mass air flow sensor, what year of car

Posted on Aug 13, 2008

  • 12 Answers

SOURCE: rough idle / engine surges until power is applied

Sounds like a possible vaccume hose leak?

Posted on Feb 07, 2009

  • 5 Answers

SOURCE: S80 engine surge at idle

You could have a bad or contaminated Mass Air Flow (MAF) sensor. You can get a used one online for less then 100. You can also purchase a can of MAF sensor cleaner at a local auto supplies store and clean it. It located right at the air filter housing.

Posted on Aug 11, 2009

peterrance19
  • 399 Answers

SOURCE: 1990 geo metro engine surges up and down when

hi sounds like your engine is surging due to incorrect mixture now your idle screw is on the thottle cable were it connects to the carb and the mixture screw is on the carb body as an approx guide turn the mixture screw fully in then out two and a half turns that should help but y may need to fine ajust later

Posted on Nov 15, 2009

honeymokey
  • 3113 Answers

SOURCE: Our 2001 ford focus when it idles it surges

Check the pcv hose for leaks at the intake manifold. Common problem.

Posted on Jan 23, 2010

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This engine has a surge; AT 35-45mph,it's a bit more prounounced, not as bad, but still there at 60mph. As the tach goes up some, then down, so does the motor, up then back down, etc.Any ideas?


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    [Archive] Enginge surges RPMS drop while driving OEM Issues. ... I so hope somebody has a clue as to what is causing my '02 Envoy's (182k) engine to ... I'll be driving and when I get up to around 35 - 45 MPH sometimes my ...

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Feb 09, 2016 | Cars & Trucks

1 Answer

I have 1990 ford f150 5.8 liter it idles high when in park and idles about 1200 rpm when in gear and sometimes surges up and down. i have clean the idle control and check showing 12.5 ohms still won&#


One common problem is a vac leak or a sticking throttle plate.
The computer controls idle speed by how much air is allowed into the intake. The idle control valve could be sticking even tho you have cleaned it, or have a faulty motor.

Sep 12, 2012 | 1990 Ford F150

1 Answer

Idle surges 1996 Nissan Maxima from 800 to 1800 rpm


could be a dirty throttle body or the idle control motor

Mar 24, 2012 | 1996 Nissan Maxima

1 Answer

Got a 99 Nissan Altima 2.4, t-chain broke... replaced head and all t-components... start up surging idle and whistling off idle... engine runs smooth and great power off idle


the surging and whistling sounds like there might be a vacuum leak that is causing this.recheck all vacuum lines and surfaces were this is a gasket that seals a vacuum source.smooth running and good power off idle suggest this leak only affects the motor at a low(idle)rpm.

Apr 14, 2011 | 2005 Nissan Altima

1 Answer

1990 geo metro engine surges up and down when stopped..... prevous owner told me he turned the idle down. So, is the surging a direct result of idle adjustment or something else? ...and where is the idle...


hi sounds like your engine is surging due to incorrect mixture now your idle screw is on the thottle cable were it connects to the carb and the mixture screw is on the carb body as an approx guide turn the mixture screw fully in then out two and a half turns that should help but y may need to fine ajust later

Nov 15, 2009 | 1990 Geo Metro

3 Answers

Low rpm's in idle when heating/cooling system is on & surges.


Check your EGR or your Idle control Valve. This can cause a problem with your irratic idling

Apr 17, 2009 | 1995 Ford Explorer

2 Answers

Rough idle / engine surges until power is applied


Sounds like a possible vaccume hose leak?

Feb 07, 2009 | 1997 Chevrolet Astro

1 Answer

Revs surging up and down - not taking throttle and uneven idle


sounds like your intake gasket broke, creating a vacuum leak, thus resulting in idle surge and un-even idle.

Jul 17, 2008 | Subaru Impreza Cars & Trucks

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