switched 2006 optima engine with a 2007 same 8th vin


Asked by Nov 09, 2015 at 10:52 PM about the 2006 Kia Optima LX

Question type: Maintenance & Repair

after swapping engines and reconnecting electric and fuel it runs v rough
cylinder 1 and 2 hold 150 and 90 psi. after car warms up 3&4 headers are v
hot but 1 not really and 2 so so. switched the 3in + cam sensor by the power
steering mount. i did break the connector to the cam sensor and it seems to
get better for a second when i giggle it.

7 Answers


With only 90 PSI that cylinder isn't firing properly or at all. Did you hear the engine run before you bought it? The 150 PSI reading is good. What do the rest of the cylinders test at? HTH. -Jim

1 out of 1 people think this is helpful.

no, not before i bought it. others at 150psi. i am not so worried about the one cylinder as #1 and 2 not really working and 1 is worse than 2. 2 is the one with only 90psi.

1 out of 1 people think this is helpful.

I'm thinking the cylinder with the low (90 PSI) compression is the problem. Are you getting a misfire code from the computer? You can try putting a spark plug anti-fouler on the low cylinder as a "Band-Aid" but it'll still be weak. There's probably a burned valve on that cylinder. Personally, if it was me, at this point I'd try to get it running half decent with the spark plug anti-fouler then cut my losses and trade it in. Even if there's a warranty on the motor you'll have to, of course, pull it and exchange it. You'll need to decide if that's the best course of action for your specific situation. I'm very sorry about this! HTH. -Jim

1 out of 1 people think this is helpful.

it is showing a po0076 code which say that the oil control/variable valve control solenoid/variable timing solenoid is most likely sending the wrong pulse to the solenoid. the connector has been broken and that may have something to do with it. but also perhaps the ecm needs to be programmed or flashed with the installation of the newer engine. any response? and i really appreciate your help!


You're welcome. Glad to help. That connector should definitely be replaced. Yes, the PCM (ECM) should be flashed using the doner vehicle's VIN. I don't believe it'll run 100% with that weak cylinder but it will probably run a lot better. HTH. -Jim


as it turns out there was a small bit of seal left on the intake mount leaving a gap. now running beautifully on all 4 cylinders. ugh! and yay!

1 out of 1 people think this is helpful.

Awesome!! Very glad you found it and it was a simple fix! Thanks for letting us know. -Jim

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