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 of 1 people found this 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 of 1 people found this 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 of 1 people found this 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 of 1 people found this helpful.

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

Your Answer


Looking for a Used Optima in your area?

CarGurus has 29,302 nationwide Optima listings starting at $1,950.


Kia Optima Experts

  • #1
    Tom Demyan
  • #2
  • #3
    James Warner
View All

Related Models For Sale

Used Hyundai Sonata
393 Great Deals out of 50,533 listings starting at $990
Used Honda Accord
540 Great Deals out of 94,361 listings starting at $1,300
Used Toyota Camry
807 Great Deals out of 71,840 listings starting at $175
Used Nissan Altima
751 Great Deals out of 67,419 listings starting at $750
Used Chevrolet Malibu
608 Great Deals out of 48,695 listings starting at $1,800
Used Ford Fusion
639 Great Deals out of 60,147 listings starting at $2,300
Used Honda Civic
347 Great Deals out of 52,617 listings starting at $1,200
Used Nissan Maxima
231 Great Deals out of 17,870 listings starting at $1,995
Used Dodge Charger
270 Great Deals out of 33,011 listings starting at $495
Used Hyundai Elantra
397 Great Deals out of 45,626 listings starting at $495
Used Kia Sorento
313 Great Deals out of 33,467 listings starting at $2,500
Used Chevrolet Impala
374 Great Deals out of 27,017 listings starting at $1,000
Used Mazda MAZDA6
157 Great Deals out of 9,855 listings starting at $1,200

Used Cars For Sale

2018 Kia Optima LX For Sale
6,446 listings starting at $15,711
2017 Kia Optima LX For Sale
117 Great Deals out of 1,994 listings starting at $11,499
2016 Kia Optima LX For Sale
9 Great Deals out of 1,183 listings starting at $9,287
2015 Kia Optima LX For Sale
53 Great Deals out of 2,137 listings starting at $7,991
2014 Kia Optima LX For Sale
14 Great Deals out of 512 listings starting at $7,299

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.