Hissing N/A??

nugget · 08-22-2008, 03:37 PM

Hey my 93 N/A just started to idle high and make a loud air sucking noise. It then will die in a hissing fit... At times while driving at around 25-40 mph it cuts out a little...It seems fine at high way speeds for now....Any one have any thoughts on this problime...I was hoping to get to fall before I had to do a swap...Well let me know what you think it could be.. Thanks

Everett · 08-22-2008, 03:48 PM

I have a similar problem. I think mine is the cold start injector or something clogged in the vacume lines. Its like the intake is sucking the entire time and idle is at 1500. I'd check the lines around the throttle body.

muffinman · 08-22-2008, 03:56 PM

sound like a possible vacuum leak maybe

TomsMR2 · 08-22-2008, 05:51 PM

5sfes are map sensored, they can leak all they want as long as the head to manifold flange doesnt leak..

does it stumble at part throttle but drive fine at wot? ok cold bad warm?

nugget · 08-22-2008, 06:24 PM

Quote:

Originally Posted by TomsMR2

5sfes are map sensored, they can leak all they want as long as the head to manifold flange doesnt leak..

does it stumble at part throttle but drive fine at wot? ok cold bad warm?

Yep... that sounds like it....It also really don't like to have a load on it at low rpm's..Like the A/C...It's random..It will go fine for 10-20 mi. then act up for a few min. Then it's "fine" again...

TomsMR2 · 08-22-2008, 09:59 PM

o2 sensor. cold and WOT bypass the ecu from reading the o2 sensor, so it'll run normal under those conditions. high load and low rpms will cause the biggest stumble.

nugget · 08-23-2008, 04:11 PM

Quote:

Originally Posted by TomsMR2

o2 sensor. cold and WOT bypass the ecu from reading the o2 sensor, so it'll run normal under those conditions. high load and low rpms will cause the biggest stumble.

Thanks I'll change the o2 sensor....Thanks alot.

TomsMR2 · 08-23-2008, 05:34 PM

www.oxygensensors.com

i very strongly suggest a denso sensor. you can do a volt meter test to verify that its bad, but that sounds like a by the book bad o2 sensor.. but then again internet diagnosis is never 100%

CyFi · 08-23-2008, 06:35 PM

Quote:

Originally Posted by TomsMR2

5sfes are map sensored, they can leak all they want as long as the head to manifold flange doesnt leak..

does it stumble at part throttle but drive fine at wot? ok cold bad warm?

will it not have issues if more air is coming in and the tps sees closed throttle?

TomsMR2 · 08-23-2008, 06:57 PM

no, the 5sfe isnt that smart

the 91's dont even have tps's.. just a wot switch.

air leaks past the head flange will just give you a high idle.. its similar to holding the throttle valve open all the time.

MR2 Drifter · 08-25-2008, 12:14 PM

Quote:

Originally Posted by TomsMR2

air leaks past the head flange will just give you a high idle.. its similar to holding the throttle valve open all the time.

Holding the throttle valve open ALL THE TIME....thats just MAD!!!

08-22-2008, 03:37 PM	#1 (permalink)
nugget Beams Owners Group Join Date: Apr 2007 Location: Oklahoma Posts: 109 Thanks: 0 Thanked 1 Time in 1 Post My Google Map iTrader Rating: (0/0% )	Hissing N/A?? Hey my 93 N/A just started to idle high and make a loud air sucking noise. It then will die in a hissing fit... At times while driving at around 25-40 mph it cuts out a little...It seems fine at high way speeds for now....Any one have any thoughts on this problime...I was hoping to get to fall before I had to do a swap...Well let me know what you think it could be.. Thanks

08-22-2008, 05:51 PM	#4 (permalink)
TomsMR2 Still not heraldo. Join Date: Feb 2005 Location: Pineapple under the sea Posts: 4,911 Thanks: 18 Thanked 406 Times in 303 Posts Blog Entries: 1 iTrader Rating: (4/100% )	5sfes are map sensored, they can leak all they want as long as the head to manifold flange doesnt leak.. does it stumble at part throttle but drive fine at wot? ok cold bad warm? __________________ Science fact: If you took all the veins from your body and laid them end to end, you would die.

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08-22-2008, 03:48 PM	#2 (permalink)
Everett Lovin' the curves! Join Date: Aug 2006 Location: Decatur,IL/Solomons,MD Posts: 1,445 Thanks: 42 Thanked 65 Times in 59 Posts My Google Map iTrader Rating: (7/100% )	I have a similar problem. I think mine is the cold start injector or something clogged in the vacume lines. Its like the intake is sucking the entire time and idle is at 1500. I'd check the lines around the throttle body.

08-22-2008, 03:56 PM	#3 (permalink)
muffinman U-P-G-R-A-Y-E-D-D Join Date: Jan 2008 Location: Sunny South Florida Posts: 5,881 Thanks: 53 Thanked 283 Times in 272 Posts Blog Entries: 1 My Google Map iTrader Rating: (2/100% )	sound like a possible vacuum leak maybe

08-22-2008, 09:59 PM	#6 (permalink)
TomsMR2 Still not heraldo. Join Date: Feb 2005 Location: Pineapple under the sea Posts: 4,911 Thanks: 18 Thanked 406 Times in 303 Posts Blog Entries: 1 iTrader Rating: (4/100% )	o2 sensor. cold and WOT bypass the ecu from reading the o2 sensor, so it'll run normal under those conditions. high load and low rpms will cause the biggest stumble.

08-23-2008, 05:34 PM	#8 (permalink)
TomsMR2 Still not heraldo. Join Date: Feb 2005 Location: Pineapple under the sea Posts: 4,911 Thanks: 18 Thanked 406 Times in 303 Posts Blog Entries: 1 iTrader Rating: (4/100% )	www.oxygensensors.com i very strongly suggest a denso sensor. you can do a volt meter test to verify that its bad, but that sounds like a by the book bad o2 sensor.. but then again internet diagnosis is never 100%

08-23-2008, 06:57 PM	#10 (permalink)
TomsMR2 Still not heraldo. Join Date: Feb 2005 Location: Pineapple under the sea Posts: 4,911 Thanks: 18 Thanked 406 Times in 303 Posts Blog Entries: 1 iTrader Rating: (4/100% )	no, the 5sfe isnt that smart the 91's dont even have tps's.. just a wot switch. air leaks past the head flange will just give you a high idle.. its similar to holding the throttle valve open all the time.