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98 kia sportage loses power
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ringram
New User
Sep 21, 2009, 7:48 PM
Post #1 of 2
(4020 views)
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98 kia sportage loses power
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Hello I have a 98 kia sportage that has a 2.0l engine and about 113,000 miles on it. I bought the car four weeks ago and for the last week it will completely shut down after about 20-30 minutes of driving. If i try to restart right away it will not start but it really tries to start. if i let it sit for about half an hour it will restart. i have already replaced the fuel filter the relays and the fuel hoses on it, and it is still doing it. i took it to autozone and a diagnostic was run on it and it gave me error codes knock sensor,o2 sensor, and crankshaft position sensor. HELP!!!!!! what do i check next?, i was told it could be my fuel pump or that it could be the ignition, or a catalytic converter issue.
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 21, 2009, 7:55 PM
Post #2 of 2
(4017 views)
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Re: 98 kia sportage loses power
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All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be test during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
4) Perform a complete compression test and record the results. All cylinders should be over 120lbs in most cases and all be within 10% of each other.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
The crank sensor code makes thatt sensor real suspect but I still wouldn't replace it without testing spark and injector pulse first.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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