Revs Jumping!
Flloid
09-25-2005, 12:44 PM
Hello everyboy!
I got a problem!When i switch my car on, my Revs start jumping from 1300 to 3000!When i drive the car she does the same!I dont know what to do can you help me please?????
I checked my car on computer and it showed me that all the sensors work well! So i dont know what happend.Whats the problem?
Please help if you can.
Thanks!
I got a problem!When i switch my car on, my Revs start jumping from 1300 to 3000!When i drive the car she does the same!I dont know what to do can you help me please?????
I checked my car on computer and it showed me that all the sensors work well! So i dont know what happend.Whats the problem?
Please help if you can.
Thanks!
Igovert500
09-25-2005, 02:52 PM
Well first things first. What car do you have? Year, model, tranny, etc. The more we know the more we can help.
Also you said you checked it via computer, you mean you hooked it up to an OBDII scanner and scanned teh ECU for codes?
Next, did this just happen out of hte blue, or was the car recently worked on?
Generally erratic idles are caused by vacuum leaks, bad spark plugs, or bad 02 sensors. Bad o2 sensors would typically throw some ECU code and a Check Engine light.
Vacuum leaks are pretty easy to start with, so do a search on here or check out www.stealth316.com and build yourself a pressure tester and check for vacuum and intake leaks. Or you could go the ghetto route and spray soapy water all over and look for bubbles, listen for air escaping.
Also you said you checked it via computer, you mean you hooked it up to an OBDII scanner and scanned teh ECU for codes?
Next, did this just happen out of hte blue, or was the car recently worked on?
Generally erratic idles are caused by vacuum leaks, bad spark plugs, or bad 02 sensors. Bad o2 sensors would typically throw some ECU code and a Check Engine light.
Vacuum leaks are pretty easy to start with, so do a search on here or check out www.stealth316.com and build yourself a pressure tester and check for vacuum and intake leaks. Or you could go the ghetto route and spray soapy water all over and look for bubbles, listen for air escaping.
Flloid
09-25-2005, 03:22 PM
I have Mitsubishi GTO Japan import Twin Turbo engine!
I never had this problem before and today i scaned my ECU on errors and everything was fine!On the forum GTOUK.com they talking about screw on thortle body but i dont know where it is!I looked under bonnet all pipes look like fine! O2 sensor was fine too because i dont have on the dash "Check Engine" and computer said it was fine!
can you explain a bit more how to check vacum pipes?
Thank you very much!
I never had this problem before and today i scaned my ECU on errors and everything was fine!On the forum GTOUK.com they talking about screw on thortle body but i dont know where it is!I looked under bonnet all pipes look like fine! O2 sensor was fine too because i dont have on the dash "Check Engine" and computer said it was fine!
can you explain a bit more how to check vacum pipes?
Thank you very much!
Twizted_3KGT
09-25-2005, 07:51 PM
The idle set screw i'd assume is what they're talking about...don't mess with that.
Igovert500
10-01-2005, 07:20 PM
can you explain a bit more how to check vacum pipes?
http://www.stealth316.com/2-pressuretester.htm
Check that out. Essentially, what maybe happening is metered air escaping from a loose hose, pipe, connection. This is called a boost or vacuum leak. They rob you of hp and can cause idling issues. Try to pressure test to find and fix leaks. Another method is spraying soapy water on all pipes and tubes and looking for bubbles where air is escaping...but that is much more primitive and may not be sufficient.
http://www.stealth316.com/2-pressuretester.htm
Check that out. Essentially, what maybe happening is metered air escaping from a loose hose, pipe, connection. This is called a boost or vacuum leak. They rob you of hp and can cause idling issues. Try to pressure test to find and fix leaks. Another method is spraying soapy water on all pipes and tubes and looking for bubbles where air is escaping...but that is much more primitive and may not be sufficient.
Automotive Network, Inc., Copyright ©2025