Ask Your Car Question. Car Experts Answer You ASAP.

(Not a Car Question?)

my idle engine speed goes up and down, I have clean the ...

Sent to Car Experts July 8 2006 at 8:44 PM
   

my idle engine speed goes up and down, I have clean the Thotle boby unit and made sure nothing is clog, I have change the Idle air controler and the throtle position sensor.

 

Optional Information:
1992 Pontiac FIREBIRD v8 5.0l

Already Tried:
CHANGED IDLE SPEED CONTROLLER

Customer (name blocked for privacy)
Status:  Closed   Value: $5
Answer
July 8 2006 at 8:45 PM (58 seconds later)
         
REPLIEDCheck Mark
What kind of car is this?
Picture
BOBBY -- Technician/ Service Advisor -- 99% Positive Feedback on 1218 Car Accepts
ASE MASTER CERTIFIED, CALIFORNIA EPA AIR CONDITIONING CERTIFIED, AA DEGREE AUTOMOTIVE/DIESEL TECH
Reply
July 8 2006 at 8:48 PM (2 minutes and 26 seconds later)
         
Reply to BOBBY's Post: PONTIAC FIREBIRD v8 5L TBI
Customer (name blocked for privacy)
Answer
July 8 2006 at 8:55 PM (7 minutes and 42 seconds later)
         
REPLIEDCheck Mark
Is it a constant up and down idle or does it only happen ever now and them?
Picture
BOBBY -- Technician/ Service Advisor -- 99% Positive Feedback on 1218 Car Accepts
ASE MASTER CERTIFIED, CALIFORNIA EPA AIR CONDITIONING CERTIFIED, AA DEGREE AUTOMOTIVE/DIESEL TECH
Reply
July 8 2006 at 8:58 PM (2 minutes and 12 seconds later)
         
Reply to BOBBY's Post: IT IS A CONSTANT UP AND DOWN AND ONLY HAPPEN AT IDLE AND ENGINE DIES WHEN i TRY TO ACCELERATE
Customer (name blocked for privacy)
Answer
July 8 2006 at 9:01 PM (3 minutes and 39 seconds later)
         
REPLIEDCheck Mark
You need to check things first. Check for any vacuum leaks. Check all of your hoses for cracks or holes. Also check your EGR valve. If you don't know where it is look at your underhood sticker. When you find it feel under it and push up on the diaphram in it. See what happens to your idle when you do this. Let me know what happens.
1 Other Expert Agrees with this!
Picture
BOBBY -- Technician/ Service Advisor -- 99% Positive Feedback on 1218 Car Accepts
ASE MASTER CERTIFIED, CALIFORNIA EPA AIR CONDITIONING CERTIFIED, AA DEGREE AUTOMOTIVE/DIESEL TECH
Reply
July 8 2006 at 9:07 PM (5 minutes and 34 seconds later)
         
Reply to BOBBY's Post: EGR VALVE oK NO CRACK IN HOSES
Customer (name blocked for privacy)
Answer
July 9 2006 at 7:44 AM (10 hours and 36 minutes and 42 seconds later)
         
REPLIEDCheck Mark
While the car is idling try tapping on the MAP sensor and see if anything happens.
Picture
BOBBY -- Technician/ Service Advisor -- 99% Positive Feedback on 1218 Car Accepts
ASE MASTER CERTIFIED, CALIFORNIA EPA AIR CONDITIONING CERTIFIED, AA DEGREE AUTOMOTIVE/DIESEL TECH
Reply
July 9 2006 at 10:44 AM (3 hours and 27 seconds later)
         
Reply to BOBBY's Post: this car do not have a MAP, The fuel pressure measured is zero. even when car is at idle, if pressure is zero how come car can still idle (althought speed goes up and down) cannot acccerelate eng die conpletely. I believe the fuel pump is defective.
Customer (name blocked for privacy)
Answer
July 9 2006 at 12:52 PM (2 hours and 8 minutes and 14 seconds later)
         
THIS ANSWER IS LOCKED!
You can view this answer by clicking here to Register or Login and paying $3.
Picture
BOBBY -- Technician/ Service Advisor -- 99% Positive Feedback on 1218 Car Accepts
ASE MASTER CERTIFIED, CALIFORNIA EPA AIR CONDITIONING CERTIFIED, AA DEGREE AUTOMOTIVE/DIESEL TECH
Think you can answer this question?
Login or Become an Expert

Related Answers

 

DISCLAIMER: You acknowledge that any information you may obtain from individuals you contact through use of the JustAnswer service comes from those individuals, not from JustAnswer, and that JustAnswer is not in any way responsible for any of the information these third parties may supply. The site and services are provided "as is" with no warranty and no representations are made regarding the qualification of an Expert. Responses and comments on JustAnswer are for general information and are not intended to substitute for informed professional advice (such as medical, legal, investment or accounting) and do not establish a professional-client relationship. JustAnswer is not intended or designed to address EMERGENCY QUESTIONS which should be directed immediately by telephone or in-person to qualified professionals. Please carefully read the Terms of Service.

JustAnswer > Car Repair