Hyundai Motor 1998 Sonata - Answered Questions & Fixed issues

Try some Lucas transmission medic. Also make sure that you have the correct weight oil. The warm tells me that as the oil lube thins down it circulates fine. Adjust to a lighter weight oil.

Check the spark plugs, or maybe it's misfiring. What's the model?

It sounds like a vacuum problem is keeping the EGR valve open causing the other sensors to read this and more fuel would be injected by the ECM. u may of gotten an egr code but the problem is not the valve itself.

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go to www.hyundaitechinfo.com make a free account and logon and you can see everything that the mechanics use.

you dont,you need the ecm from the newer motor,your old brain wont work

No promises but this is the only reference I could find for Hyundai where the fuse box was not behind a panel to the bottom side of steering wheel. It may inspire you to look elsewhere behind items. Good Luck. "The interior fuse panel is located behind the coin holder pull out drawer, which is on the lower left side of the dashboard"

You had alot apart to do your work, and I suspect the IAC motor has dirty passages, or EGR does.

try using a scanner to reprogram the CPU as the battery was probably disconnected to service the alternator.

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Isn't that off the same one ignition coil? If it is, it is probably a bad coil.

it sounds like the oil sending unit which is an inexpensive part and simple to replace it should be located between radiator and engine on the side of the oil pan

what about the plug and wire for that cylinder?

Carefully check the air inlet tube (TOP AND BOTTOM) for hairline crack.

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I need one new hazard switch for my hyunday sonata 1998 4cilinder

Yoy will get a diagram and how to do it from a workshop manual (Gregorys or haynes) as it is involved to explain here. Strongly suggest you have a hyundai qualified mechanic do it as it will save you money in the long run. IT is not just belts that need replacing but idler pullets and hydraulic adjuster (if you have one) as well as crank seal and cam shaft seal. Oil is the biggest killer of timing belts and all except the pulleys have oil in their presence.

hope this helps http://www.modifiedlife.com/1998-hyundai-sonata-car-audio-wiring-diagram/

there can be a few things to look at. A vacuum leak. The idle air control valve or a problem with the transmission. is there any codes?

Sounds like a immobilisor fault ,was battery left connected with the key in the ignition and the drivers door open??