How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask jazzmaster Your Own Question

jazzmaster
jazzmaster, ASE Certified Technician
Category: Pontiac
Satisfied Customers: 2318
Experience:  ase certified
8668911
Type Your Pontiac Question Here...
jazzmaster is online now
A new question is answered every 9 seconds

1998 Sunfire: sputters..about 2.5 hours of driving, (in hotter weather

Customer Question

1998 Sunfire sputters after about 2.5 hours of driving, (in hotter weather, I think) the car would sputter and go out. Now it already is after 1/2 hour of driving. Can start right after and go again. Starting/cranking is usually a bit longer than normal.
Submitted: 3 years ago.
Category: Pontiac
Expert:  jazzmaster replied 3 years ago.
hi, did you get this checked with a scanner connected to it and if so did you get any engine codes?I am thinking that there maybe a problem with either the throttle sensor or the coolant(for the pcm) sensor that maybe inhibiting the fuel delivery process./is this running hotter than usual and are there any other symptoms that you can think of ,how long does it take to start after it sputters and or stalls (if it does stall at all)
Customer: replied 3 years ago.
Yes, had a scanner on it. It showed it was running rich and also running lean.
The temperature is normal when it happens.
It cranks about 6-7 seconds for starting cold or hot.
It usually starts pretty much right after it goes out. It sometimes sputters a bit after.
Expert:  jazzmaster replied 3 years ago.

ok,I ned you to do this relearn listed below before we can go further,so do this and let me know if that helped ,,,,

CRANKSHAFT POSITION SENSOR (CKP) SYSTEM VARIATION LEARN PROCEDURE

IMPORTANT: A Crankshaft Position System Variation Learning Procedure must be performed any time a change is made to the crankshaft sensor to crankshaft relationship. Changing the crank sensor to crankshaft relationship will not allow the PCM to detect misfire at all speeds and loads accurately. Resulting in a possible false misfire DTC being set. Removing a part for inspection and then reinstalling the same part is considered a disturbance. A false DTC P0300 could be set if this procedure is not performed.

The learn procedure is required after the following service procedures have been performed, regardless of whether or not DTC P1336 is set:

  • PCM replacement.
  • Engine replacement.
  • Crankshaft replacement.
  • Crankshaft position sensor replacement.
  • Any engine repair(s) which disturbs the crankshaft/harmonic balancer to the crankshaft position sensor relationship.

CAUTION: Before performing the Crankshaft Position System Variation Learning Procedure always set the vehicle parking brake and block the drive wheels in order to prevent personal injury. Release the throttle immediately when the engine starts to decelerate in order to eliminate over revving the engine. Once the learn procedure is completed, the control module will return engine control to the operator and the engine will respond to the throttle position.

IMPORTANT: The battery must be fully charged and in good condition. The scan tool connection at the DLC is clean and tight before starting the Crankshaft Position System Variation Learning Procedure.

  1. Close the hood.
  2. Block the drive wheels and set the vehicle parking brake.
  3. Put the vehicle in Park or Neutral.
  4. Turn all the accessories OFF.
  5. Install a scan tool.
  6. Start and run the engine until it is at normal operating temperature 85°C (185°F).
  7. With the engine still running, enable the Crankshaft Position System Variation Learning Procedure with the scan tool.
  8. Press and hold the brake pedal firmly and raise the engine speed to the specified value, RELEASING the throttle as soon as the engine cuts out.
  9. Verify with the scan tool that the crankshaft variation has been learned. Perform this procedure up to 10 times. If the PCM will not learn the variation, a DTC P1336 should be set. Refer to the DTC P1336 Crankshaft Position (CKP) System Variation Not Learned 2.4L or the DTC P1336 Crankshaft Position (CKP) System Variation Not Learned 2.2L for diagnosis.

 

also there could be a problem with the air flow meter ,you can try and clean the sensor by spraying it with carb cleaner and using shop air ,blow it dry then reinstall it ,this may be the problem as dirt will often get on the resistor wire(s) in the sensor ...guy...

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Last | Next >
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
  • He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Dave Nova

    Pontiac Technician

    Satisfied Customers:

    1917
    ASE Master Certification. GM World Class Certification
< Last | Next >
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Pontiac Technician

    Satisfied Customers:

    1917
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/PE/peterpete190/2012-2-24_1274_20120215135406.64x64.jpg Pete's Avatar

    Pete

    Pontiac Technician

    Satisfied Customers:

    1243
    15 Years Pontiac Technician and training.
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    Pontiac Technician

    Satisfied Customers:

    943
    15 years GM master tech/15 years ASE master
  • http://ww2.justanswer.com/uploads/DR/drivefast1971/2012-1-12_172422_0009051tQKh.64x64.jpg Ron Z.'s Avatar

    Ron Z.

    - Pontiac Tech -

    Satisfied Customers:

    570
    18+yrs experience. State Inspector and Pontiac Diagnostics
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    GM FACTORY CERTIFIED TECHNICIAN

    Satisfied Customers:

    514
    ASE A1-A8 w/L1 GM master technician.Factory certified/40 years experience
  • http://ww2.justanswer.com/uploads/Rocket2005/2009-09-13_133703_jack.jpg car tech's Avatar

    car tech

    ASE Certified Technician

    Satisfied Customers:

    446
    25 years master tech and shop owner
  • http://ww2.justanswer.com/uploads/MO/molurch/2012-6-6_214526_500.64x64.png Don 'Mo Lurch''s Avatar

    Don 'Mo Lurch'

    Pontiac Mechanic

    Satisfied Customers:

    441
    GM, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.