Question about Cars & Trucks

1 Answer

New rebuild 4.0, when I started it, it accelerated way to high, checked throttle linkages and throttle valve, I mean it took off like a jet engine, any suggestions?

Posted by on

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 35 Answers

Idleairvalve stuck turn key to on poss 5 times with out starting veh after 5 time start veh should idle normal

Posted on May 10, 2014

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Ad
brainyass
  • 242 Answers

SOURCE: 2006 pt cruiser idles high with no pcv valve hose connected

Replace the PVC valve, it's probably clogged.

Posted on Nov 21, 2008

  • 4088 Answers

SOURCE: my xj6 runs at high rpms and accelerates on its own

None of those possible problems have anything to do with idle speed. The first thing might be a very weak throttle return spring. The next would be a sticky throttle cable or foot feed pedal that isn't moving freely. Another possibility is a vacuum leak somewhere. Did changing the spark plug in #1 cylinder help the misfire? If not, you may have a partially plugged injector. Fixing the misfire will only increase idle speed some more. Look for an idle speed motor near the throttle body that is supposed to raise idle speed when the engine is cold and lower it back when the engine warms up. Check to see if it is holding the speed too high. If the throttle position sensor tells the computer where the idle speed motor is set, then it could have an effect on idle speed if the sensor is bad. The position sensor is just a fancy potentiometer. Hope some of this helps.

Posted on Aug 26, 2009

Testimonial: "thank you!"

honeymokey
  • 3113 Answers

SOURCE: 2000 buick lesabre transmission - high rpm's in 1st to 2nd gear

SHift solenoid pressure switch

Posted on Jun 06, 2010

jturcotte
  • 8273 Answers

SOURCE: my service engine light is

These are all things that can affect your gas mileage and engine performance.

To check for vacuum leak, look for unhooked hoses on top of engine. If OK, use starter fluid and spray along intake manifold gaskets with engine running. If engine speeds up, there is a leaking gasket.

IAC deals with idle. Does the car idle smoothly? If not, remove IAC to see if it's dirty. I will paste instructions below for the IAC valve.

Throttle body dirty--what code is this? never heard of such a code, but you can clean the throttle body wioth carb cleaner. I will paste instructions below.

IAC valve info:


Operation The amount of air taken in during idling is regulated by the opening and closing of the servo valve located in the air passage that bypasses the throttle valve. The servo valve is opened or closed by the activation of the stepper motor (incorporated within the idle air control motor in the forward or reverse direction. Battery positive voltage is supplied, by way of the MFI relay, to the coil of the stepper motor. The engine control module switches ON the power transistors (located within the engine control module) in sequential order, and, when current flows to the stepper motor coil, the stepper motor is activated in the forward or reverse direction.


Removal & Installation

  1. Disconnect the negative battery cable.
  2. Detach the electrical connector at the sensor.
  3. Remove the sensor from the throttle body.
To install:
  1. Install the sensor in the opening in the throttle body and tighten the sensor.
  2. Attach the electrical connector to the sensor.
  3. Connect the negative battery cable.


Testing
Checking Coil Resistance

  1. Disconnect the idle air control motor connector and connect the jumper (test harness).
  2. Measure the resistance between terminal (2) of the connector at the idle air control motor side and terminal (1) or terminal (3). Standard value: 28-33 ohms at 68°F
  3. Measure the resistance between terminal (5) of the connector at the idle air control motor side and terminal (6) or terminal (4). Standard value: 28-33 ohms at 68°F
  4. If not within specifications, replace the IAC Valve.
  5. If within specifications, check connectors and wiring between the sensor and ECM/PCM.
Checking Operation Sound
  1. Check that the operating sound of the stepper motor can be heard over the idle air control motor when the ignition switch is turned to the ON position (without starting the engine).
  2. If no operating sound can be heard, check the stepper motor drive circuit. (If the circuit is good, a defective stepper motor or engine control module is suspected.)

      0029f4e.gif
    IAC picture--mounted on top side of engine.
      Throttle body--loosten clamp to right of throttle body and pull hose off. Use electric parts cleaner or carb cleaner--spray on dirt with engine running. don't touch any sensors inside throttle body--sensors are delicate.
    b9362af.gif

    Posted on Oct 11, 2010

    ginko
    • 19396 Answers

    SOURCE: 2001 Isuzu Rodeo 54248 miles

    Hi.

    If problem is only on startup and when idleing, then the problem is likely IAC system, also a vacuum leak will cause the same problem.

    If problem is not only on startup and idle, but also when driving, then MAP sensor and EGR system must be checked.

    Check also accelerator cable state and setting.


    60549ef.jpg

    The first thing to do is pulling out the OBDII fault codes stored in the ECM. This is done connecting a code reader to the ECM diagnostic port. The job can be done for a small fee at any local garage, and it is done for free at AutoZone.

    The codes will help locating the problem.

    About possible faults:

    Problem is stalling when idling and during startup, but engine idling fast all the time. Problem not starting at times it is due to the fact that the wrong mixture is being sprayed, this is probably causing flooding and misfire. Since the CEL is on, one of the codes returned is probably misfire.

    Check accelerator.

    Check IAC system. This is composed by a valve and a solenoid that check and control amount of extra air air when the engine is idling. The IAC valve is located on top of the throttle body.

    Check the vacuum system and try cranking with gas tank cap off. Vacuum system is tested using an hand tool gauge onvacuum lines while spraying card cleaner on the hoses (or heating them with a torch). If there is a leak, pressure will go up. A big leak will also do hissing noise, and will often result in a lean code when doing an OBD code scanning.

    This kind of symptoms can also be caused by weak wiring to MAP/MAF sensor (MAP in this engine).

    If the car also drives very rough and is revving up and down in a weird way, check the EGR valve.

    As first thing I would do a code scanning. This car is OBDII. The scan can be done for free at the nearest Autozone, or for a small fee at any garage.

    If you get any OBDII code from the scan, report it here, so that we can individuate the possible reason for the problem.

    If you repute my solution helpful, then please take some times to accept the solution. Providing good repair tips requires time and skills, and your feedback is important for us.

    Regards.

    Ginko.

    Posted on Oct 26, 2010

    Add Your Answer

    Uploading: 0%

    my-video-file.mp4

    Complete. Click "Add" to insert your video. Add

    ×

    Loading...
    Loading...

    Related Questions:

    2 Answers

    How do you adjust idle speed 1991 johnson 100 hp


    not important, what's important is that they are absolutely clean, including the four brass high speed jets located in the bottom center portion of the carburetor.

    That model engine's carburetors has fixed jets, BUT if the slow speed jets are adjustable, earlier model carburetors have been installed. If so...................

    The four adjustable needle valves control the flow of fuel in relation to the set air flow, adjusted as follows (if needed).

    (Dual Carb V/4 With 4 (2 each carb) Slow Speed Adjustable N/Valves)
    (J. Reeves)

    The adjustment procedure of the carburetor slow speed needle valves follows. NOTE... if the needle valves turn too freely, replace the nylon bearing retainer (the nylon item at the front of the carb that the needle valve goes through first) with the newer type RED retainer #315232. If your engine has that weird linkage that connects all four of those needle valves, the newer RED retainers will enable you to discard that linkage. The RED retainers make it impossible for the needle valves to vibrate out of adjustment.

    (Carburetor Adjustment - 2 Slow Speed Adjustable Needle Valves, each carburetor)

    Initial setting is: All (4) Slow speed valves = seat gently, then open 1-1/2 turns.

    Facing the carburetors, start with the top left needle valve, then the top right valve, then the bottom let valve, then the bottom right valve. It may be necessary to redo these steps to get the adjustments ideally set

    Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.

    Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

    Do not attempt to gradually adjust all four of the valves at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve.

    When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.

    Jun 28, 2017 | Cars & Trucks

    1 Answer

    WHAT MEANS WHEN "ETC POWER"IS ON?


    seems something wrong with the Electronic throttle control (ETC) which is an automobile technology that electronically "connects" the accelerator pedal to the throttle, replacing a mechanical linkage
    There is no mechanical linkage between the accelerator pedal and the throttle valve with electronic throttle control. Instead, the position of the throttle valve (i.e., the amount of air in the engine) is fully controlled by the ETC software via the electric motor.
    - you better have the ETC immediately serviced by an approved Toyota-shop
    Electronic throttle control Electronic Throttle Control
    25117169-dtj5krvtgjoqdjoc5b0bl5xd-2-0.jpg

    Sep 19, 2014 | 2000 Toyota RAV4

    2 Answers

    Why four barrels do not open 65 4100 carb


    The choke linkage is not properly hooked up or adjusted. The throttle linkage is not adjusted properly or there isn't enough vacuum. The choke linkage has a tab that prevents the 4 barrels from opening when the choke is engaged. There is a tab on the throttle linkage from the front 2 barrels that will engage the secondaries when they rotate past a certain point. Vacuum opens the top plates on the secondaries.

    Sep 19, 2014 | 1965 Ford Mustang

    1 Answer

    1963 vw newly rebuilt engine, starts then dies at RPM acceleration


    Could be one or both of two things.

    1. The accelerator pump in the carb is clogged, the linkage is unhooked, or the diaphram in the pump is bad. It's cheap to replace and comes in the carb rebuild kit. This usually just causes hesitation when you step on the gas pedal. It doesn't usually cause the engine to stop running.

    2. More likely is that the main jet in the carb is clogged. At idle, high vacuum under the closed throttle plate in the carb causes fuel to flow thru the idle jet. As the throttle plate opens (as you step on the pedal), the vacuum under the plate dissipates, stopping the flow of fuel thru the idle jet, and the vacuum ABOVE the throttle plate increases, which is supposed to then draw fuel from the carb bowl thru the main jet in the carb. If the main jet is clogged with dirt, then it can idle just fine and die as soon as you step on the pedal.

    Jul 24, 2011 | 2000 Volkswagen Beetle

    1 Answer

    I dont have to excelerate the car goes by itself i have to keep my foot on the brakes all the time, the engine is racing off when on park and the car jerks when i have to change the gear. the engine light...


    SOUND LIKE STICKING THROTTLE LINKAGE.HAVE ACCELERATOR CABLE CHECK UNDER THE HOOD ITS BINDING OR MISROUTED IN THE WRONG PLACE CAUSING A PULL ON ACCELERATOR CABLE CAUSE THROTTLE HANG OPEN CAUSING HIGH IDLE.

    Jul 21, 2010 | 2002 Chevrolet Impala

    1 Answer

    When starting engine has a very high idle


    THROTTLE PLATE THROTTLE SHAFT OR LINKAGE IS DAMAGED OR STICKING.THE IDLE AIR CONTROL VALVE IS DAMAGED OR FAILED.CHECK FOR VACUUM LEAKS AROUND THE THROTTLE BODY GASKET AND CHECK FOR LOOSE BOLTS ON THE THROTTLE BODY UNIT.

    May 19, 2010 | 2002 GMC Envoy

    1 Answer

    Pepboys gave me the obd code p2004 imrc bank 1 stuck open? what does this mean and how much is it likely to cost to fix?


    P2004 INTAKE AIR SYSTEM MALFUNCTION. POSSIBLE CAUSE.TEST FOR STICKING ACCELERATOR OR SPEED CONTROL CABLE TURN OFF KEY AND DISCONNECT ACCELERATOR AND SPEED CONTROL CABLE FROM THROTTLE BODY.ROTATE THE THROTTLE BODY LINKAGE TO DETERMINE.IF IT ROTATE FREELY.THE THROTTLE BODY MAY HAVE FAILED.CHECK AIR CLEANER AND AIR INLET ASSEMBLY FOR RESTRICTIONS.CHECK THE IAC MOTOR RESPONSE.IT MAY BE DAMAGED OR STICKING.CHECK PVC SYSTEM VALVE AND HOSES FOR LEAKS AND PLUGGING.CHECK FOR SIGNS OF VACUUM LEAKS IN THE ENGINE OR COMPONENTS. TEST TP SENSOR SIGNAL DUE A SWEEP TEST AT KEY ON ENGINE OFF

    Mar 29, 2010 | 2000 Ford Focus

    1 Answer

    2001 Toyota Tacoma Xtracab with 1st-2nd shifting problem


    if it has a kick down cable that could be the problem look for a cable running from throttle to trans that can be adjusted in length

    Sep 24, 2009 | 2001 Toyota Tacoma

    2 Answers

    I have a 1982 Oldsmobile 4door Cutlass it has a 3.8 liter V-6 with a 2 bbl carb....the car is idling OK but when you step on the throttle it starts to run rough and very poorly...to keep it moving you have...


    SOUND LIKE YOU MISSING THE IDLE SPEED SOLENOID.I REMEMBER I HAD A 81 OLDS 260 V8.IT HAD THE 2 BARREL ROCHESTER.IT HAD THE IDLE SPEED SOLENOID MAKING CONTACT TO THE THROTTLE LEVER.

    Aug 11, 2009 | Oldsmobile Cutlass Cars & Trucks

    Not finding what you are looking for?
    Cars & Trucks Logo

    Related Topics:

    27 people viewed this question

    Ask a Question

    Usually answered in minutes!

    Top Cars & Trucks Experts

    yadayada
    yadayada

    Level 3 Expert

    76132 Answers

    Colin Stickland
    Colin Stickland

    Level 3 Expert

    22156 Answers

    Randy Ohler

    Level 3 Expert

    14585 Answers

    Are you a Car and Truck Expert? Answer questions, earn points and help others

    Answer questions

    Manuals & User Guides

    Loading...