Question about 1997 Pontiac Grand Am

1 Answer

Engine surges under load and not under load

Will surge as much as 1000 RPM's when in Neutral and pressing gas to between 3000 and 4000 RPM's. Stalls at a stop inermittantly. When car is accellerating the fuel connection is fine. When you attempt to maintain a speed (not accelerating or decellerating) the engine shudders and shakes.

Posted by wlgordon on

  • mrwilliams_7 Feb 24, 2009

    where is the vaccum line
    and the EGR

  • Bruce Bracey
    Bruce Bracey May 11, 2010

    Is the service engine soon light illuminated while driving or when the car is acting up? If so, go to your local Auto Zone or Advance Auto and have the codes read and report them back to me.



    Your description reminds me of a couple of things.

    1) a vacuum leak: cracked, broken or disconnected vacuum hoses.

    2) EGR valve sticking or defective.

    Let me know about the light.

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1 Answer

EdCarCal

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  • Pontiac Master
  • 1,223 Answers

Surging is often caused by a bad sensor in the air/fuel supply - MAP, IAC or TPS. Check for trouble codes (DTCs) using a good code reader.

Posted on Feb 09, 2018

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5 Related Answers

Anonymous

  • 61 Answers

SOURCE: engine revving up by itself

vacuum leak or idle vale problem

Posted on Aug 12, 2008

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Anonymous

  • 41 Answers

SOURCE: 1994 Nissan 3.0 pickup surges

check error codes
http://npora.ipbhost.com//index.php?showtopic=21

Posted on Nov 24, 2008

muttandjeff

Allen Neal

  • 359 Answers

SOURCE: No power accelerating or going up a hill

HAVE SOMEONE CK THROTTLE POSITION SENSOR AND CATALYTIC CONVERTER MAKE SURE EXHAUST IS CLEAR

Posted on Feb 03, 2009

SOURCE: Car stalls when you let off the gas when warm or idling

sounds like your IAC (idle air control valve) located on the throttle body towards the front of the engine held in by 2 torx screws. the iac controls the idle if the car when your not on the gas. i will post the steps to clean the iac and the passages that the iac goes into.

1. disconnect the iac connector
2. remove the iac
3 clean the iac pintle valve and check for wear
4. clean the passages that the pintle valve sits in (usually carbon build-up in there, you may need to remove the air intake tube and air filter box to get to the passages in the throttlebody)
5. if the iac looks ok and the passages are cleaned re-install and put everything back
6. start car and see if it idles like normal when warmed up. you may need to give it a few tries for the iac to re-learn its proper position so give it a few warmup cycles
7. if it still stalls check for proper operation of the iac via ohming out the connectors (if you look it up on google you will find the specs at which the iac is supposed to operate)
8. if the iac is working properly, check for vacuum leaks on the intake manifold and vacuum lines.
9. if no vacuum leaks are present and the iac id working properly after cleaning have a shop check the ecm (engine control module) for a bad circuit board, i've seen that haoppen as well

hope this helps!

Posted on Feb 17, 2009

jfirebird71

  • 335 Answers

SOURCE: 1998 Pontiac Grand Am GT 3.1 V-6 Engine RPM Surge

might be ur throttle position sensor

Posted on Apr 08, 2009

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