It won't stay on
You cross up the plug wires I bet. Follow this diagram and recheck.
Try to narrow it down to a fuel issue or ignition issue. Does it start right back up, after it cuts off? If you have to keep cranking it to get it running again, suspect a fuel problem. Change the gas filter and have the fuel pressure checked. Also have the computer scanned for trouble codes-a sensor may be problematic-something as simple as a Coolant Temp. sensor, or the idle air control.
To check your ignition circuit, check for spark at the spark plug right after it cuts off. You need to see a strong, blue spark to know the ignition is good.
SOURCE: wiring diagram for 2002 kia optima
Not a guarantee but try the kiatechinfo.com in the below information:
Kiatechinfo.com will get you all the information you need when working on a kia 2nd only to a chiltons or haynes manual.
For kiatechinfo.com register (its free) then select the information for
your car make model engine. Then either do a search for timing belt
or pick from proper items in cloumn to the left.
SOURCE: how do you change the spark plugs on a kia optima 2.7 v6
you have to remve the bolts on top and sides of the plenum assy be sure not to drop anything down in the lower intake!!!!! the bolt heads are 12mm and there are 2 on top 2 on the ends and three int the front
SOURCE: change spark plug wires on 04 kia sedona
REMOVAL OF THE PLUGS:
Do not attempt any maintenance on spark plug if engine is hot.
1. Disconnect negative battery terminal.
2. Carefully remove high-tension leads.
3. Use compressed air to blow any dirt or debris from around spark plug hole.
4. Check that spark plug fits squarely in spark plug socket and remove spark plug.
Raise a vehicle and install SST(OK552 131 001) in order to replace cylinder 2, 4, 6 spark plug.
INSTALLATION:
1. Install spark plug into cylinder head.
Tightening torque : 18~22lb-ft (25~30N·m, 2.5~3.0kg-m)
2. Reconnect high-tension leads.
3. Reconnect negative battery cable.
Hope this helps and simple to understand. Good luck
SOURCE: does my 2003 kia optima have a fuel pump cut off
There is a fuel pump relay and it is;
If you remove the trim panel around the radio, its located behind the ash tray (no need to actually pull the radio). There are two relays, the lower one is your fuel pump. The other is the main relay.
You can try disconnecting the battery for ten minutes and that may resolve the issue as well. I cannot find the fuel shut off switch on that model. There is a fuel pump fuse that is located in the fuse panel and that may be bad, I would recommend that you check that first before you do anything else.
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