Main IndexAuto Repair Home Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN







91 Camaro THROTTLE BODY PROBLEM


  Email This Post



thirdgennewie
User

Sep 26, 2009, 11:57 PM

Post #1 of 22 (3469 views)
Shortcut
91 Camaro THROTTLE BODY PROBLEM Sign In

91
chevy
camaro
5.0
87k

Hey , I Just purchased a 91 camaro rs 305 and when I start the car it runs for a couple seconds and then alot of fuel dumps on the top on the two butterfly valves that open when you start the car and it makes a hissing noise like air is coming out thats loud, and the car shuts off but when i started it another time the fuel wasnt spraying as much and the noise was not there.


Hammer Time
Ultimate Carjunky / Moderator


Sep 27, 2009, 8:31 AM

Post #2 of 22 (3458 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

Your having a problem with the overfueling for some reason. The hissing noise is just the idle air control opening up trying to overcome this. This could be bad injectors, computer, related wiring or other things. You need to use a professional scan tool to examine the sensor data to give you a hint of what is going on. This may not even be the injectors doing this. The fuel pressure regulator is built into the throttle body and that could be leaking. Try unplugging the injectors and see if the fueling stops then.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Sep 27, 2009, 8:33 AM)


thirdgennewie
User

Oct 1, 2009, 11:53 PM

Post #3 of 22 (3433 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

I replaced the injectors and still the car is having trouble turning on and once it drives its like its gasping for fuel but I was wondering if it could be the fuel filter instead of th epump since the car is still turning on .

thanx guys


Hammer Time
Ultimate Carjunky / Moderator


Oct 2, 2009, 5:32 AM

Post #4 of 22 (3430 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

Why did you change the injectors? Nobody ever suggested that. No, the fuel filter won't cause that.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



thirdgennewie
User

Oct 20, 2009, 7:57 PM

Post #5 of 22 (3386 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

ok ive changed the injectors, fuel filter ,I also tested the fuel pressure an got 8pci's.....? and discovered some vacum leaks but the car is still doing the same thing it will run for about an hour an start to shut off while driving or stopped if you have any suggestions please help. thanx


Hammer Time
Ultimate Carjunky / Moderator


Oct 20, 2009, 8:06 PM

Post #6 of 22 (3382 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

If your saying that your fuel pressure is 8 PSI, then there is a problem. The spec is 9-13 and I'm sure yours gets even worse at times. Get your fuel pressure resolve first.

You could have a regulator leaking in the throttle body.


The pressure regulator is an integral part of the fuel meter cover, and contains an air chamber and a fuel chamber that are separated by a diaphragm-operated relief valve and a calibrated spring. The function of the regulator is to maintain constant pressure across the injector at all times.fuel pressure is regulated by the difference between fuel pump pressure acting on one side of the diaphragm and the force of the calibrated spring (and air cleaner pressure) acting on the other side. The system operates in an acceptable pressure range of 62 to 90 kPa (9 to 13 psi). The fuel meter cover includes a bleed that relieves system pressure when the engine is turned "OFF". The bleed also helps purge vapors from the injector and regulator after a hot restart.
If the pressure regulator in the TBI supplies pressure which is too low (below 62 kPa or 9 psi), poor performance could result. If the pressure is too high, excess emissions and unpleasant exhaust odor may result.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Oct 20, 2009, 8:16 PM)


thirdgennewie
User

Oct 20, 2009, 8:21 PM

Post #7 of 22 (3371 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

 yes I got 8psi's and fuel pressure resolve?? could it be the pump ? I went to carx and they said i need a new distributor, erg sensor, and map sensor???


Hammer Time
Ultimate Carjunky / Moderator


Oct 20, 2009, 8:24 PM

Post #8 of 22 (3369 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

How are any of those things pouring fuel into your throttle body?




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



thirdgennewie
User

Oct 20, 2009, 8:34 PM

Post #9 of 22 (3364 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

they arent, its either the fuel pressure regulator or the pump then right?


Hammer Time
Ultimate Carjunky / Moderator


Oct 20, 2009, 8:38 PM

Post #10 of 22 (3363 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

The pump isn't going to do that either, especially with the low pressure reading. I would pinch off the return hose or the pressure hose after your gauge and check the pressure again. If it spikes up then, the pump is fine. If you can't get any readings over 15PSI, then the pump may be bad. Otherwise, I'd concentrate on the throttle body where the regulator is.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



thirdgennewie
User

Oct 20, 2009, 8:40 PM

Post #11 of 22 (3356 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

how do i test to see if its the regulator??


Hammer Time
Ultimate Carjunky / Moderator


Oct 20, 2009, 8:45 PM

Post #12 of 22 (3350 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

Pinch off the return and see if the pressure bleeds off when shut off. If it does, also pinch off the pressure line before the gauge after shut off to see if it stops the bleeding. If it still bleeds with both lines pinched off, the regulator has to be leaking.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



thirdgennewie
User

Oct 20, 2009, 8:45 PM

Post #13 of 22 (3347 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

which line is the return line ? or pressure hose? and where do you pinch it off?


thirdgennewie
User

Oct 20, 2009, 8:49 PM

Post #14 of 22 (3345 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

should the pump constantly hold pressure after you turn the car off when testing the fuel pressure? because it went back down to zero when i turned the car off


Hammer Time
Ultimate Carjunky / Moderator


Oct 20, 2009, 8:49 PM

Post #15 of 22 (3343 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

I don't know how your checking fuel pressure if you don't know the pressure line from the return.

The pressue line is the larger one. You want to isolate the tank on both lines.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



thirdgennewie
User

Oct 20, 2009, 8:53 PM

Post #16 of 22 (3335 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

I tested it going out of the fuel filter to the throttle body


Hammer Time
Ultimate Carjunky / Moderator


Oct 20, 2009, 8:54 PM

Post #17 of 22 (3332 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

That would be the pressure line.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



thirdgennewie
User

Oct 20, 2009, 8:57 PM

Post #18 of 22 (3326 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In


In Reply To
which line is the return line ? or pressure hose? and where do you pinch it off?


which line is the return line ? where and how do you pinch off the return line?

do I have to discoonect it from the throttle body?

Thanx in advance


thirdgennewie
User

Oct 20, 2009, 9:21 PM

Post #19 of 22 (3324 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

which is the return line?? and where and how do I pinch it off?? thankyou for you help and patience


thirdgennewie
User

Nov 10, 2009, 1:08 PM

Post #20 of 22 (3273 views)
Shortcut
91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

OK so ive changed the pressure regulator and the car still is turning off and giving me no starts but with the help of some starting fluid spray or throttle body cleaner she starts up eventually, if you have any advice it would be greatly appreciated..thank you


thirdgennewie
User

Jan 19, 2010, 3:19 PM

Post #21 of 22 (3144 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

Does anyone know where the oil pressure sending unit is on a 91 camaro??

any help is greatly appreciated thanks


Tom Greenleaf
Ultimate Carjunky / Moderator


Jan 19, 2010, 6:40 PM

Post #22 of 22 (3137 views)
Shortcut
Re: 91 Camaro THROTTLE BODY PROBLEM [In reply to] Sign In

  • Sending unit
  • The Oil Pressure Switch is located: Under vehicle, driver side, below engine area, center of block, mounted above oil pan flange
    Application:
    Sending unit

    *************** That's what a parts outlet says, T
    _________________________________________
    Long retired now




    91 Camaro THROTTLE BODY PROBLEM


      Email This Post
     
     






    Latest Forum Post
    Thanks for the info. I will let you know how it turns out.
    This is what's happening... https://www.youtube.com/watch?v=nTssBdJEg2A I bo...
    Hello, So I have a 2003 Sonoma SLS 4.3L V6 with 166,000 miles and about a week ...
    1999 Chrysler Town & Country LXi AWD 3.8L 130,000 I am in the process of in...
      1999 model audi A64.2 there`s oil in the reservoir head gaskets c...
    It's almost midnight, and the temperature outside is 38°C (100°F) at the momen...

    Feed Button


    Used Car Search
    Used Car Price Ranges:
    Under $5,000
    $20,000
    $35,000

    $10,000
    $25,000
    $40,000
    $15,000
    $30,000
    $45,000
    Over $45,000
    Search used Cars By Manufacturers:
    Used Acura
    Used Audi
    Used BMW
    Used Buick
    Used Cadillac
    Used Chevrolet
    Used Chrysler
    Used Dodge
    Used FIAT
    Used Ford
    Used GMC

    Used Honda
    Used Hyundai
    Used Infiniti
    Used Jaguar
    Used Jeep
    Used Kia
    Used Land Rover
    Used Lexus
    Used Lincoln
    Used Mazda
    Used Mercedes-Benz

    Used MINI
    Used Mitsubishi
    Used Nissan
    Used Porsche
    Used Saab
    Used Scion
    Used Subaru
    Used Suzuki
    Used Toyota
    Used Volkswagon
    Used Volvo
    2010 Honda Civic
    $15,770
    2004 Jeep
    $8,991
    2012 Mustang
    $22,990
    1997 Honda Cr-V
    $4,490
    2010 Toyota Prius
    $17,496
    2010 BMW 328
    $26,980




    Automotive Forum Categories
    Automotive Repair
    Auto Body Repair and Refinishing
    AC Auto Repair Help Forum
    Automotive Wiring and Electrical

    Auto Insurance and Car Financing
    Automotive World
    Brake Systems
    Car Stereo Repair Advice
    Car Troubleshooting
    Engine and Car Noises
    Engine Fault Codes
    Engine Troubleshooting
    Exhaust System Repair

    Steering and Suspension
    Tricks of the Trade
    General Discussions
    Car Shows and Events
    The Bargin Bin
    Motor Vehicle Inspection
    Car Care Tips
    Traffic Ticket Help
    Car Racing

    Gasoline, Motor Oils, Concept Cars
    Remote Control Cars and Vehicles
    Truck Repair
    Truck Repair Advice


    Truck Engine Repair
    Truck Suspension Repair
    Motorcycle Repair
    Motorcycle and ATV Repairs

    Motorcycle Body Repair
    Motorcycle Clutch Repair
    Motorcycle Engine Repair
    Motorcycle Seat Repair
    Car Forum Posts - Sitemap


    Search for (options)