Question about 1995 Nissan Sentra

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Automatic choke settings

Need to know how to set the choke properly

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This car doesn't have a choke, it is computer controlled enrichment during cold start.

Posted on Nov 06, 2012

  • mike carr Nov 06, 2012

    this vechile does have a choke it contains a vacum diaphragm and a bimetal spring so just need to know how to set up and adjust properly

  • yadayada
    yadayada Nov 06, 2012

    With the engine cold loosen the choke cover and turn the cover until the chioke is just closed then turn it about 5 more degrres tighter. PS in the USA we have no carbrator equipped cars in this model and year.You have it listed as a 1995 Nissan Sentra.

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How to adjust automatic choke


Procedure #1-
  1. Be sure the hook on the bimetallic spring contacts the choke shaft lever.
  2. Install the cover and retainer and lightly tighten the screws.
  3. Turn the ceramic element to align the mark on it with the middle mark on the housing.
~~~ Procedure #2-
  1. The engine must be cold to make this adjustment.
  2. Remove the air cleaner.
  3. Find the automatic choke. It's the round thing on the upper right-hand of the carburetor. There is a wire coming to it from the positive side of the coil.
  4. Note: The automatic choke is a round ceramic thing with the heating element wound inside of it. (The ceramic part may be covered with metal so that it looks just like the rest of the carburetor.) The choke is held in position by a triangular ring clamp and three screws so it can be loosened and rotated for adjustment.
  5. Pull the throttle arm on the left side of the carburetor down to free the little step arm (cam) that the screw at the top of the throttle lever rests on.
  6. Note: This stepped "cam" is connected to the butterfly valve inside the throat of the carburetor by a shaft that extends all the way into the automatic choke. With the engine cold, the butterfly valve should be closed. As the engine warms up, the coil inside the automatic choke uncoils, opens the butterfly valve, and moves the cam to reduce the idle speed.
  7. Release the throttle arm so that the return spring snaps it back. The little screw at the top of the throttle arm (again, with the engine cold) should now rest on the top step of the stepped cam. This sets the hi-idle, which is needed together with the choke on a cold engine to provide sufficient idle speed to keep the engine running until it warms up fully.
  8. Loosen the three screws on the right side that hold the choke in place.
  9. Keep your eye on the butterfly valve in the carburetor throat.
  10. Turn the choke element clockwise (viewed from the right) until the butterfly is standing straight up, then turn the choke counterclockwise (viewed from the right) until the choke butterfly fully closes (barely -- not too tightly), then tighten the three screws that hold the choke in place.
  11. Note: This is important; the automatic choke may be assembled wrong and not catching the hook on the coil spring at all.
  12. Start the engine with the air cleaner off. As the engine warms up, make sure that the butterfly opens until it is standing straight up (full open) when the engine is fully warm. If it doesn't, readjust the choke until you get it right.
  13. Note: The engine is now warm, so you won't be able to adjust the choke per the foregoing. Note the position of the notch on the side of the choke relative to the three little ridges on the body of the carburetor. If the butterfly is too far closed with the engine warm, turn the choke clockwise just a bit to straighten it up. The notch on the choke should never be too far outside of the three ridges on the body of the carburetor. If you are not able to adjust the choke using these method, something may be sticking, or perhaps the coil spring inside the canister is broken, or perhaps the wire has fallen off of the contact on the canister so that it is not getting power from the battery properly.

Jul 15, 2015 | Cars & Trucks

1 Answer

Suzuki samairi 1987,starts fine when Cooke go off or when engine worms up it dies will not idol at all.


the chock must be bad.
on all carb cars , since 1964 i remove it and make it a manual choke
then hot starts are easy, hot, its not touched. (instant starts hot)

chokes this old never work right, they are TOO old
the spring in side (bimetal) is NO GOOD. it fails to open properly.
try setting the choke calibration more lean.
if at higher altitude, even leaner.

the book is free. see it here
http://www.fixkick.com/sammi-stuff/index.html

The choke is a device on most old carbs (varies by country)
that closes a butterfly valve, (google that) and starves the engine of air, thus the word "CHOKE" as in Choking it.
this causes higher venturi vacuum and more fuel flows from the jet nozzles.
if the chock is set too rich the engine floods
if set too lean , you have to pump the gas pedal to keep it alive.
if the bimetal spring is slow, it floods
if the choke is electic the heater needs to work or the choke sticks on.
if the choke is water heated, the water needs to flow there. again
the motor floods and stalls.

rtm. read the chapter on the Choke, the book is free.
http://www.fixkick.com/sammi-stuff/index.html

Aug 08, 2014 | 1987 Suzuki Samurai

1 Answer

My 1969 GTO takes forever to start in cold weather, once it catches and warms up it runs fine


Assuming the engine is in good shape and not in need of a major tune-up, check your carburetor choke. It's not closing when cold. Clean and adjust.

Get a service manual and follow the instructions. Far too complicated to cover here.

Also, make sure you know how to properly SET the choke on a cold start. Slowly push the gas pedal to the floor and let up. Start engine without touching gas. If it's REALLY cold, like 0 degrees, you can hold the pedal halfway down while starting, after setting the choke.

Feb 06, 2014 | Pontiac GTO Cars & Trucks

1 Answer

I have a 1989 Mercedes 560SEL. Gasoline engine.Problem is the car will not start unless I push the choke down on top of the carburetor OR I can prime it with a little gas After doing this I can drive it...


Vacuum is only used to open the choke. To close, assuming it is an automatic choke, there is a thermal spring coil. There is usually an adjustment that consists of loosening the fasteners on the round spring housing and turning. It should have marks for different settings, but these are not exact. Adjust in the morning by loosening the screws, opening the throttle with one hand, and rotating the spring housing until the choke is just closed. Tighten the screws. Make sure to check the engine after it warms up to see if the choke is opening properly. There may also be a fast idle setting that uses a cam to increase the idle when tne choke is closed.

Aug 04, 2017 | 1989 Mercedes-Benz Mercedes Benz S Class

3 Answers

1975 Datsun (ie. mechanical fuel pump). Carburettor, electrics (inc. battery all good) fuel strainer all good. On cold start engine needs to be cranked several times. Warm start is invariably immediate. ...


Carburated vehicles ether have an automatic choke, or the very old ones, a hand choke. Yours has an automatic choke. The starting problem likely is a problem with the choke. The problem is almost certainly not the fuel pump.To set the automatic choke, push the accelerator to the floor, and RELEASE. Then start the engine just like you would a fuel injected vehicle. If this doesn't solve the problem, then the automatic choke needs to be repaired.

Oct 31, 2010 | Datsun Pulsar Cars & Trucks

1 Answer

Were is the automatic choke situated my car is revving to high


Your car doesn't have a choke. Fuel injected engines alter the mixture using information from the sensors to give the right mixture all the time, thus negating the need for a choke. This is only for carbureted engines, and your car is not. If it's idling fast, you can change the settings on your idle set screw, or have it tuned.

Dec 09, 2009 | 1992 BMW 3 Series

3 Answers

Flooding,black smoke,run hard,choke sticking


The first thing i would look at here is the choke pull. Make sure that after the car starts, the choke props open. Also, as the engine warms, make sure the electric choke is opening up. If not, make sure you have 12V to the choke. If so, replace it. This should solve the problem.

But let me know if you need any further assistance, ok? We'll get it working! :)

Oct 06, 2009 | 1986 Chevrolet Caprice

2 Answers

1995 Mitsubishi L300 Van 2ltr aspirated motor, Automatic choke revs extremely high on cold start, will not decelerate till engine is hot. How can I remedy this?


If it's carburetor & has automatic choke, then there is probably a screw at side of carb, by step cam that moves with choke . Back it of a little at a time until you get desired cold idle speed. Make sure you turn step cam to setting it would normally be when cold, and choke on, then turn screw out to lower rpm's. Look for a little rod from choke shaft, down to base or side of carb area, to step cam.

Jul 17, 2009 | 1988 Mitsubishi Pickup

1 Answer

High Idle from start


Maybe the automatic choke needs a good cleaning and has gummed up over time and is possibly causing the choke to stick until the engine warms and loosens the part to function properly.

Apr 18, 2009 | 1994 Toyota Pickup

1 Answer

Need fuel/air settings for 4150 holley 600cfm. from seat.


Depends where the timing is set and you really just have to play with them until you get the rigght settings

Nov 16, 2008 | 1981 Ford F 100

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