Fuel System problems

Fuel System: System that provides fuel to the engine. It is formed by a fuel pump, pipes and injectors or a carburetor in older cars.
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Unstable revs, trembling, stalls, power loss

Hyundai Elantra 1998  10000 miles
I have a Hyundai 98 and, after some minutes of driving without any inconvenients, the car starts losing power when accelerating, revolutions become unstable and drop until the car stalls. Sometimes it even feels as if the engine were trembling. I've already changed spark plugs, candles, fuel pump and pistons, and even checked the car's cylinder head, but my problem is still there.
tave from United States 9 years ago  
TA
2 reports 
samson from United States 9 years ago
This happened to me and it was the IAC valve, which controls the acceleration. You can by cleaning it but, if the problem remains, you will need to change it for a new one.
Naz from United States 9 years ago
What samson is saying is true, it is the IAC vale that is failing. It is not hard to change it: you disconnect the battery, insert the valve, again the battery in its place and that's it. Hope it helps!
Anton from Australia 7 years ago
Yep, same issue - I had the problem start on me after the car was sitting in not too hot direct sun outside. EVERY TIME it slowed to a stop at lights, in slowntraffic etc itbstalled and needed to be started and revs kept high, which wasn't stably able to be done. So what causes this and what's the fix ?
Jugheas from Canada 7 years ago
I had the same issue and it was the alternator that needed replacing. It went undiagnosed for 3 years. Hesitation when accelerating and also a lot of blown head lights almost every 3 months I had to replace them. I thought it was the wiring to the distributor cap anD also replaced that. But the alternator did the trick. I discovered it one day when I had the car idling for 20 minutes and it died on its own. The alternator was partially functioning but under load wasn't producing enough current.
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Periodically stalling when making stops

Hyundai Elantra 2015  90000 miles
My elantra will stall for no reason at stop signs will always restart replace crack shaft señor worked for a couple of days filled up gas tank problem return any suggestions it has 130 thousand kilometres on it
Helpme from Canada 5 years ago  
HE
10 reports 
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