RPM problem - Mustang Evolution

Go Back   Mustang Evolution > 4 Cylinder | V6 | Classic Mustangs || Tech and Talk > Pre-2005 V6 Mustang



Reply
 
Thread Tools Search this Thread
Please support our sponsors and let them know you heard about them here!
Old 09-09-2003, 09:20 PM   #1
Registered User
Newbie
 
Join Date: Jun 2003
Posts: 19
RPM problem

I began to have problems with my car since I had the dual exhaust installed. Whenever I have the car in park for longer than 2 minutes the RPM drop to 500 for a second then return to 750, it continues to do so for as longer as the car is on. The same thing happens when I come to stop when I am driving. I had the battery, alternator, spark plugs, and the air intake checked and none of these seem to cause the problems. I had auto zone run the test on the computer an no codes came up. I am thinking it might be the oxygen sensor.
Dave is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 09-09-2003, 09:25 PM   #2
Legacy Member
Legacy
 
Monkey's Avatar
 
Join Date: Jun 2003
Posts: 1,286
yeah, i think the welder got a little too close to the O2 sensor and one may be burnt out. I would just either take it to autozone to tell them which one is bad, or just buy a new set and replace the pair yourself.
__________________
**I have sigs turned off, so if you're asking for advice based on your mods, I can't see them**
Monkey is offline   Reply With Quote
Old 09-09-2003, 09:32 PM   #3
Legacy Member
Legacy
 
Join Date: May 2003
Posts: 1,895
Send a message via AIM to Rellik Send a message via Yahoo to Rellik
I kinda doubt its your 02 sensors. When they trip, it trips a CEL.
I would test them with a multimeter, or have someone test them for you.
Did you ever get a check engine light. You could haev an exhaust leak somewhere.. or even a vacumm leak.
Rellik is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 09-09-2003, 09:37 PM   #4
Legacy Member
Legacy
 
Monkey's Avatar
 
Join Date: Jun 2003
Posts: 1,286
they dont always throw a code. if there is a small short that sometimes works and sometimes doesnt, it wont throw a code. he is saying that it works for about 2min before it kinda flucuates for a second. that split second wouldnt be long enough for the CEL to go on.

vacuum leak would hold the idle high. trust me, ive had about 5 of them, and can be in excess of 1000-1500rpm at idle
__________________
**I have sigs turned off, so if you're asking for advice based on your mods, I can't see them**
Monkey is offline   Reply With Quote
Old 09-09-2003, 09:51 PM   #5
Legacy Member
Legacy
 
Danger Dude's Avatar
 
Join Date: May 2003
Region: South Carolina
Posts: 5,187
Send a message via AIM to Danger Dude
It might be the O2 sensor but it might be the Idle sensor causing the fluctuation. But Monkey is right O2 sensors can be intermitten and unless they come on the computer will not store a code.
__________________
Danger Dude is offline   Reply With Quote
Old 09-10-2003, 10:53 AM   #6
Legacy Member
Legacy
 
Join Date: May 2003
Posts: 1,895
Send a message via AIM to Rellik Send a message via Yahoo to Rellik
When was the last time you changed or cleaned your air filter?
Rellik is offline   Reply With Quote
Old 09-10-2003, 02:04 PM   #7
Registered User
Newbie
 
Join Date: Jun 2003
Posts: 19
I took it the muffler shop a day after I got it installed and they said there wasn't any leaks. I recondition Mac filter about a month before the mufflers were installed. I quess I'll have the oxygen sensor checked.
Dave is offline   Reply With Quote
Old 09-10-2003, 03:08 PM   #8
Legacy Member
Legacy
 
Join Date: May 2003
Posts: 1,895
Send a message via AIM to Rellik Send a message via Yahoo to Rellik
You re conditioned your mac air filter.

I'm going to assume that you re-oiled it. You may want to check to see if your MAF is gunked up with oil from the filter.
Rellik is offline   Reply With Quote
Old 09-14-2003, 02:33 AM   #9
Registered Member
Regular
 
.:DarkEntity:.'s Avatar
 
Join Date: Jul 2003
Posts: 145
Send a message via AIM to .:DarkEntity:.
I had the same problem...
except my 'Check Engine' light was on too, and it was the O2 sensor
__________________
.
http://www.mustangmods.com/data/13888/legacysig3.jpg
____________________________________________________
.:DarkEntity:. is offline   Reply With Quote
Old 10-22-2003, 09:14 PM   #10
Registered User
Newbie
 
Join Date: Sep 2003
Posts: 3
come to a conlusion of the problem? also have the same prob after dual install.
zerauj is offline   Reply With Quote
Old 10-24-2003, 07:38 PM   #11
Registered User
Newbie
 
Join Date: Jun 2003
Posts: 19
I took everyones advice on what was causing the problem, but nothing helped. My engine light doesn't turn on so I don't think it's the O2 sensor. I don't know if you have the same problem, but when I press on the brake I notice the rpm drop. Check out the discussion on the same subject:


http://www.v6stangs.com/forum/viewtopic.php?t=2616
Dave is offline   Reply With Quote
Old 10-24-2003, 08:20 PM   #12
Registered Member
Regular
 
Join Date: Oct 2003
Posts: 28
Send a message via Yahoo to mustangmeat
this has been discussed a thousand times. mine does the same thing with the stock exhaust. my guess is it's a coincidence with the exhaust and the real cause is the fuel delivery system. you didn't say what year car you had, but many people have this problem with 99 and newer cars.
mustangmeat is offline   Reply With Quote
Old 10-24-2003, 08:21 PM   #13
Registered Member
Regular
 
Join Date: Oct 2003
Posts: 28
Send a message via Yahoo to mustangmeat
i would not buy an expensive *** o2 sensor if the light isn't on. i would think you would be wasting your money
mustangmeat is offline   Reply With Quote
Old 10-24-2003, 08:31 PM   #14
Registered User
Newbie
 
Join Date: Jun 2003
Posts: 19
I have a 2000 and I have pretty much given up. When I have enough money I'll take it to ford and hopefully they'll find the problem.
Dave is offline   Reply With Quote
Old 10-24-2003, 08:32 PM   #15
Registered Member
Regular
 
Join Date: Jun 2003
Posts: 231
I think it is a vacuum leak.
Can you hear a leak at all?
A sort of hissing sound?

But it could be anything.
Extreme Effects.com is offline   Reply With Quote
Old 10-27-2003, 02:00 PM   #16
Registered User
Newbie
 
Join Date: Jun 2003
Posts: 19
I went back to the muffler shop the day after I had the exhaust installed and they found nothing wrong. If anyones finds a solution please let me know.
Dave is offline   Reply With Quote
Old 10-27-2003, 08:59 PM   #17
Legacy Member
Legacy
 
Join Date: May 2003
Posts: 1,895
Send a message via AIM to Rellik Send a message via Yahoo to Rellik
Did they test you 02 sensors?
Rellik is offline   Reply With Quote
Old 10-27-2003, 09:15 PM   #18
Registered User
Newbie
 
Join Date: Jun 2003
Posts: 19
No I haven't tested them because no codes come up and the engine light doesn't turn on.
Dave is offline   Reply With Quote
Old 10-27-2003, 09:17 PM   #19
Legacy Member
Legacy
 
Join Date: May 2003
Posts: 1,895
Send a message via AIM to Rellik Send a message via Yahoo to Rellik
U should test them anyway.
Rellik is offline   Reply With Quote
Old 10-27-2003, 09:23 PM   #20
Registered User
Newbie
 
Join Date: Jun 2003
Posts: 19
How would I go about doing that?
Dave is offline   Reply With Quote
Old 10-27-2003, 10:36 PM   #21
Legacy Member
Legacy
 
Join Date: May 2003
Posts: 1,895
Send a message via AIM to Rellik Send a message via Yahoo to Rellik
take it back to the exhaust shop.

Or take it to a shop that will do it.

Or pick up a multimeter, and a hanyes manual.
Rellik is offline   Reply With Quote
Old 10-27-2003, 11:18 PM   #22
Legacy Member
Legacy
 
Fishers Stang's Avatar
 
Join Date: May 2003
Region: Indiana
Posts: 1,507
Send a message via AIM to Fishers Stang
my O2 is out (one of them, but it does not change my idle, the only thing its dowin now is soundin a lil louder cause its freazin cold here (well 32* right now :no: ) but just my $0.02 worth, and thats very little)
__________________
Charles
2006 F150 4x4 with the 5.4L V8
Fishers Stang is offline   Reply With Quote
Old 10-27-2003, 11:55 PM   #23
Legacy Member
Legacy
 
Join Date: May 2003
Posts: 1,895
Send a message via AIM to Rellik Send a message via Yahoo to Rellik
02's can hurt your idle. I had one out, and my car had horrible mileage, and a rough idle.
Rellik is offline   Reply With Quote
Reply

Lower Navigation
Go Back   Mustang Evolution > 4 Cylinder | V6 | Classic Mustangs || Tech and Talk > Pre-2005 V6 Mustang

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
take off RPM NotoriousSPG Pre-2005 V6 Mustang 3 08-12-2006 08:48 AM
RPM Problem whitev6stang03 Pre-2005 V6 Mustang 6 01-20-2006 06:52 PM
Peek hp rpm? SeadudeRXP Pre-2005 V6 Mustang 12 12-12-2005 02:53 PM
Launching RPM ttpancakes Pre-2005 V6 Mustang 37 07-27-2004 12:11 AM
RPM dips wiarumas Pre-2005 V6 Mustang 23 10-19-2003 07:50 PM

» Like Us On Facebook



08:38 AM


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0

MustangEvolution.com is in no way associated with or endorsed by Ford Motor Company.