V6 Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.

Started up, then started revving high

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Old Dec 30, 2005 | 07:48 PM
  #1  
Doom Sayer's Avatar
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From: Richmond, VA
Car: '06 Nissan Sentra SE-R Spec V
Engine: Big block 2.5L
Transmission: 6 Speed
Started up, then started revving high

Since my tach is messed up I don't know where it really idles at. I just know that when it idles it's at around 2000 on the tach, but it's not accurate.

Tonight I started it up and it was at 2000 like usual but then started going up slowly and you could hear the motor going up in RPMs as well.. I tapped the on the gas to see if it would stop, but that didn't do anything and the tach and motor kept going higher... I shut it off and started it back up. This time it was revving at 4000 soon as it started up, and it started going up again to about 5500 and I cut it off again.. It sounded like I was sitting there with my foot on the gas a 1/4 way down and slowly pushing on it more and more

Again, the numbers are not accurate I'm just trying to explain it as I saw it
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Old Dec 30, 2005 | 08:36 PM
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daves12secV6's Avatar
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From: Sayreville NJ
deffinatly sounds liek u have a major vacum leak/iac motor is screwed or ur intake gaskets ar leaking
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Old Dec 30, 2005 | 10:52 PM
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From: Richmond, VA
Car: '06 Nissan Sentra SE-R Spec V
Engine: Big block 2.5L
Transmission: 6 Speed
I'm pretty sure it isn't a vaccum leak, but it could be the IAC... I have been wanting to clean it for a while now, just never got around to it.... Is there a way I can check to see if it's my intake gaskets without tearing anything apart?
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Old Dec 31, 2005 | 01:00 AM
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From: Manchester, NH
Car: 91 Firebird
Engine: 191ci 6cyl
Transmission: 700r4
I think you can spray soapy water on your intake and it'll bubble or something if there's a leak.
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Old Dec 31, 2005 | 01:43 AM
  #5  
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From: NWOhioToledoArea
Car: 86-FireBird
Engine: -MPFI
Transmission: T5
Axle/Gears: 3:42
Originally posted by Nocturnall
I think you can spray soapy water on your intake and it'll bubble or something if there's a leak.
got the backwards, you use soap n water to check leaks n tires / inner tubes. as the air leaks out to create a bubble. On a intake you spray wd40, carb cleaner, either... anything flamable so when it suck it in, you can hear an rpm change.
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Old Jan 3, 2006 | 12:08 PM
  #6  
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From: Richmond, VA
Car: '06 Nissan Sentra SE-R Spec V
Engine: Big block 2.5L
Transmission: 6 Speed
I think I fixed the problem.

If you look at this picture https://www.thirdgen.org/techbb2/att...postid=2663340

Under the IAC, is that the TPS that is in the bottom of the red circle? It has something shaped like a circle plugged into the side of it... I had the car running and I unplugged it and it didn't idle any different, I stuck it back in and when I did I pushed it in hard and it started idleing normal again. So what I'm thinking was somehow it wasn't pushed in all the way causing it to idle high, does that make sense?
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Old Jan 3, 2006 | 04:49 PM
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From: Chico, CA
Car: 89 Firebird, 92 RS
Engine: 2.8L MPFI, 355 TPI
Transmission: t-5, t-5
Axle/Gears: open 3.42, posi 3.42
yep
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Old Jan 3, 2006 | 07:05 PM
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From: Richmond, VA
Car: '06 Nissan Sentra SE-R Spec V
Engine: Big block 2.5L
Transmission: 6 Speed
Cool. I fixed something without knowing what I was doing
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Old Jan 3, 2006 | 09:35 PM
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From: Sayreville NJ
thats really odd if i unplug my tps it just runs liek total crap at idle and it wont go anywere with load on it (in gear)
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Old Jan 4, 2006 | 04:55 PM
  #10  
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From: Richmond, VA
Car: '06 Nissan Sentra SE-R Spec V
Engine: Big block 2.5L
Transmission: 6 Speed
Weird.
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