Hey every one I got a hyundai sonata 98 not working I'm trying to bring it to life. Yesterday I finally made it start after I replace all the belts including timing belt (adjuster belt was broken) it started at first try but it was running rough I am sure I alighned everything as supposed. Then itshutted down so I tried again and it started. Any ideas?

Perhaps I am old school... how long did it sit.. not running? If it sat for a long time. Did you clean out all of the fuel lines, drain the gas tank? Replace the spark plugs and the wires?

Thanks for your answer I will clean all the fuel system and cables,sparklugs,and coil. Do you know how can I test the crank position sensor?

I'd focus on the Ignition Control Module (ICM). Apply silicone heat transfer compound to the back of the ICM, if you decide to replace it. Also, don't overlook replacing the fuel filter.

Thanks tx I claened all the fuel system,sparkplugs,cables, and coil. Everything is good. How can I check the ICM? Don't you think the crank position sensor could be the problem? Thanks in advance

Yes, the CKP could definitely be the problem. Take the ICM to AutoZone and have them test it on their Well's machine. My experience has been if it tests bad it is really bad. However, if it tests okay, it may still be bad. Instead, I recommend changing these problematic components every 125,000 miles or 10 years, whichever comes first.

I got a po110 code on my 98 hyundai sonata which is a problem with iat sensor (obd2) I called autozone and they said this car doesn't have this kind of sensor any help is welcomed thanks

You have an Ambient Air Temperature Sensor

1998 Hyundai Sonata 2.0L MFI DOHC 4cyl
AutoZone Part Number: SU2181
$17.99

I couldn't check it today. I've been trying to find any information on the internet but nothing shown for hyundai sonata. Can you tell me where is it located? Thanks

Likely on the air intake. Look at the picture on AutoZone's website and then locate it on your car.

Hey tex I will tell you everything what I did to my car so maybe you could give me a diagnose. I got this car from some one after he had it park for about 6 months when I got it I started by checking all the motor belts,cables,spark plugs,fuel filter,starter,cam and crank sensors everything was good but the timing tensioner that was broken so I replaced it. After I finished putting everything back together I started it and it ran rough so I adjusted the speed sensor and when idle the car runs smooth but as soon as I engage the speed (automatic transmission) the rpm go up and down. Do you have any idea what could be the problem?

Fluctuating rpm is often a dead giveaway that the ICM is bad. Did you ever replace it?

No I haven't ever replaced it I'm going to remove it later and take it to autozone to see if it good. It does the fluctuating only when the transmition is engage it and as soon as I push the acelerator it runs pure smooth no problems at all I can run it at 90mph and I can't feel I am that fast even on the hills it does not reduce its speed much

Here's the deal with AutoZone's Well's machine. If it tests good, it may not be good; however, if it tests bad, it is bad. That's been my experience. Instead, I now recommend replacing ICMs every 125,000 miles or 10 years, whichever comes first.

My 98 hyundai sonata does not start. I have checked the starter and is good,I replaced the alternator,the ignition coil is good ,no problems with the gasoline pump. Any body has an idea what else to check? I don't know what the crank sensor is for. Can some one tell me? Thank you every one

The CKP Sensor controls timing, by providing the trigger signal for when the ICM fires.

That means the CKP can be the problem then. Is there any way to test it with out remove it off the car?

Also do you know how to test the ignition coil pack? My car is a 4 cylinder 2.0 98 hyundai sonata. Well I just need the ohm results thank you tx

Testing coils is pretty much a waste of time, since you cannot test them under load. My rule of thumb is to replace them every 125,000 miles or 10 years, whichever comes first.

Yesterday I removed the timing belt cover and I found out the timing belt was missing some teeth. I started cheching here and there and I saw that the 98 hyundai sonata I is a interference engine. What that mean? If you can explain me. I also found out there's no power coming out of the coil so I'm going to replace it today. I checked all my fuses and relays are good and I have power in the coil connector. What I am worried about now is if my valvs are good or bent. Is there any way I can inspect them before I tried to start my car? Thank you