1991 Hyundai excel- 1.5 -difficulty starting when car cold

Naturally aspirated carburetor with automatic choke.

If youre in winter (northern hemisphere) then the choke will set when you depress accelerator for cold start.

After the engine starts it unloads (opens) the choke slightly. As the engine warms it continues to open the choke until fully open.

Likely the choke is not opening as the engine reaches normal operating temperature and fuel mixture us too rich causing poor combustion and black smoke.

Your engine probably has an automatic choke device that adjusts automatically with engine temperature. To set the choke when the engine is cold you have to depress the accelerator to the floor and release it completely. You shouldn't have to depress the accelerator again to start the engine, turn the key the engine should start. As the engine begins to warm up it will also begin to initially run faster then it will start to run rough. At this point you have to press the accelerator and release it again. The auto choke mechanism should allow the choke butterfly to open. There may be a number of stops in the system and the choke butterfly will stop again still not fully open and only become fully open when the engine is at operating temperature. Hope this answers you question, Rgs. Bob

Yes, spring may have broken or maybe it just needs adjustment. There is a high idle cam that makes the card idle higher when the choke is closed or partly closed.

sounds like auto matic choke problem try a manual choke

I assume you have a carby on the engine.Is the auto choke is at the top of the carby and is attached to the top butterfly directly under the air cleaner. Normally a round black cap held in place by 3 screws in a metal ring. Loosen the screws and turn the black cap slightly to close off the butterfly slightly when cold. You will need to press on the accelerator to activate a ratchet cam to allow the choke to work

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.

see if your engine has a ECT sensor (temp sensor that delivers information to your ECM) they are installed on the intake side of the cylinder head, it usually has 2 cables, have it checked replace if necesary

It's the automatic choke!

The choke is "closed" or barely open... When cold, the engine needs a RICH mixture (more gasoline, less air). When the engine warms up, it requires a LEAN mixture (less gas, more air).

It is probably creating BLACK tailpipe smoke ... that means unburnt gasoline. (Blue smoke is OIL, white smoke is WATER).

Put the parking / emergency brake ON.
1. Remove air cleaner assembly from intake, use a carb cleaner spray or throttle body spray cleaner and spray just a little. (AutoZone $5)
2. Find the accelerator arm under the hood.
3. start car, rev the engine to make sure how to operate the accelerator from under the hood.
4. Carefully spray into carb / throttle body and work the accelerator ... don't let the engine die...
5. Watch out for "backfire"... it may create a small flame out of the carb. It will extinguish itself in one second.

6. You may need to do this two, three times.
7. Add a "complete fuel system cleaner" to your next tank of gas ($8).

That's it! ... pretty cheap, too.

Hope this helps!

dear friend-i think you must start by checking the cam timing as you did work on the head before.timing could have jumped.keep me posted.

Hey. do you have an automatic choke on the car? If so, it could be that the automatic choke is stuck in the open position. You could trace the the accelerator cable to see if it`s getting stuck. I had this problem with the automatic choke on an Escort Ghia once and then installed a manual choke instead.