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MY 2002 YAMAHA GP 1200 WILL IDLE FINE AND ALL 3 CYL. WILL RUN IN IDLE SPEED, BUT WHEN I OPENED THE THROTTLE ONLY AFTER 20-30 SECONDS THE ENGINE SEEMS THAT IT GOES IN SAFE MODE AND 2 OF THE3 CYL. SHUT DOWN LEAVING THE SKI DRIVEABLE BUT AT LOW SPEED. I HAD TO REMOVE THE C.C. DUE TO CORROSION AND INSTALLED A 'D' PLATE WITH THE CHIP ON THE O2 SENSOR. I REBUILT THE CARBS LAST YEAR . I DON'T KNOW IF THE ENGINE COMPUTER IS GOING BAD OR I HAVE A CARB ISSUE, I BELIEVE IS A COMP. PROBLEM DUE TO THE FACT THAT I SHUT OFF THE ENGINE, WAIT 10-20 MIN AND STARTS W ALL 3 CYL. AND RUNS PERFECT FOR 20-30 SECONDS. IS THE COMP. BAD OR NEEDS RESET? BY THE WAY THE SKI RUNS FINE ON THE TRAILER W/THE HOSE HOOKED UP TO IT AND RESPONDS NORMAL. BUT IS UNDER A LOAD THAT THE PROBLEM HAPPENS...NO WARNING LIGHTS NOR ALARMS APPEAR. ==ANY CLUES?==

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  • juan hofle Apr 01, 2011

    thanks for the quick response. I will work on these areas over the weekend and will let you know next week. thanks again. juan

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  • Master
  • 1,978 Answers

Try and cover the easy and cheap stuff first. Open up your electronics box first so any condensation/moisture can dry out. Moisture or condensation in the box can cause intermittent /bad running and be very hard to diagnose. I have purchased several very good, inexpensive ski's that just had moisture effecting the electronics.
Next, disassemble the carburetors. There may be enough room in your machine that you can take off the covers one at a time to check this with out having to remove the whole carburetor rack. If the diaphragm side of the carburetor with the teeter-totter needle set up can be accessed easily. Lay a clean white sheet under the carburetor rack and carefully take the tops off, clean the white corrosion out of the needles on the low corner of the carburetors and replace the needles if worn. Be careful not to stretch or alter the springs. After cleaning, carefully reassemble the carburetor tops and close the electronics box putting a thin film of grease on the o-ring. With any luck the quick corrosion clean and electronics box dry out should take care of your running issues.

Posted on Apr 01, 2011

  • David Belcher
    David Belcher Apr 01, 2011

    Should be a fairly simple and easy fix. Remember to put down the white sheet so you do not lose any small parts.

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I have a Briggs & Stratton Vanguard 16 HP motor. It idles fine and it runs OK at high RPMS. But it backfires thru the carburetor during accelerating. Any suggestions?


On some float-type carburetors, you can adjust the air-fuel mixture and engine speed at idle. Check for an idle speed screw designed to keep the throttle plate from closing completely, and an idle mixture screw that limits the flow of fuel at idle. If your carburetor contains these screws, proceed below.
  1. With the engine off, remove the air filter and air cartridge.
  2. Locate the idle mixture screw and turn it clockwise until the needle lightly touches the seat. Then, turn the screw counterclockwise 1-1/2 turns.
  3. If your carburetor has a main jet adjustment screw at the base of the float bowl, turn the screw clockwise until you feel it just touch the seat inside the emulsion tube. Then, turn the screw counterclockwise 1 to 1-1/2 turns. Replace the air cleaner assembly and start the engine for final carburetor adjustments.
  4. Run the engine for five minutes at half throttle to bring it to its operating temperature. Then, turn the idle mixture screw slowly clockwise until the engine begins to slow. Turn the screw in the opposite direction until the engine again begins to slow . Finally, turn the screw back to the midpoint.
  5. Using a tachometer to gauge engine speed , set the idle speed screw to bring the engine to 1750 RPM for aluminum-cylinder engine or 1200 RPM for engine with a cast-iron cylinder sleeve.
  6. With the engine running at idle , hold the throttle lever against the idle speed screw to bring the engine speed to "true idle." Then, repeat the idle mixture screw adjustments from Step 4 to fine-tune the mixture .

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Truck dies when idling


HI
first I would like to tell you, do this procedure only if the 5th digit of your VIN is C or K.

Description

The engine control module (ECM) learns the idle position of the throttle plate to ensure the correct idle. Anytime the throttle body is cleaned or replaced, the ECM must learn the new throttle position. The idle may be unstable or a DTC may set if the throttle position is not learned.

Conditions for Running the Throttle Learn Procedure

• DTCs P0101, P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0506, and P0507 are not set.

• The engine speed is between 450-4,000 RPM.

• The manifold absolute pressure (MAP) is greater than 5 kPa.

• The mass air flow (MAF) is greater than 2 g/s.

• The ignition 1 voltage is greater than 10 volts.

Throttle Learn

Important: Do NOT perform this procedure if DTCs are set. Refer to Diagnostic Trouble Code

(DTC) List - Vehicle.

1. Start and idle the engine in PARK for 3 minutes.

2. With a scan tool, monitor desired and actual RPM.

3. The ECM will start to learn the new idle cells and Desired RPM should start to decrease.

4. Ignition OFF for 60 seconds.

5. Start and idle the engine in PARK for 3 minutes.

6. After the 3 minute run time the engine should be idling normal.

Important: During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.

* If the engine idle speed has not been learned the vehicle will need to be driven at

speeds above 70 km/h (44 mph) with several decelerations and extended idles.

7. After the drive cycle, the engine should be idling normally.

* If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds

and repeat step 6.
8. Once the engine speed has returned to normal, clear DTCs.
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Hi, Anonymous the carburetor throttle shaft wheel has two cables the cable closest to the right side of the bike is the throttle cable and the one closest to the left side is the idle cable. Right about the middle between the two is the idle adjustment bolt it faces out towards the air filter end of the carb . The engine should be at operating temperature with the enrichener off to set the idle between 950-1050 rpm. Turn the idle adjustment bolt clockwise to increases idle speed and counterclockwise to decrease idle speed. If you have access to your air fuel mixture bolt you may adjust it as well if not there is a video below on how to gain access, make sure you start with clean or new spark plugs. Gently turn the air fuel mixture bolt clockwise until it starts to bottom out "STOP" do not over tighten as it will damage the taper on the end, now back it out 2 full turns to establish a starting point start the engine and check the idle rpm's and adjust the idle adjustment bolt accordingly for 950-1050 rpm if necessary, adjust the air fuel mixture bolt 1/4 turn at a time and let the engine settle for about 10 seconds, clockwise for a leaner mixture and counterclockwise for a richer mixture you are seeking the highest rpm your air fuel mixture bolt can acquire without going past 3 full turns from bottom then readjusting the idle adjustment bolt back down to 950-1050 rpm If you can not detect any rpm change and can not stall the engine by turning the air-fuel mixture bolt all the way in then your pilot/low-speed jet is too big. Final adjustment should be made with a clean air filter mounted to the carburetor. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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  • 46 - Voltage To F.I. System Not Normal
  • 50 - ECU Internal Failure – Memory Check <<Dead Engine>>
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