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Multiple codes / Engine problems (Sonata)


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joelncope
New User

Jan 31, 2011, 7:18 AM

Post #1 of 3 (1306 views)
Multiple codes / Engine problems (Sonata) Sign In

I bought a 4 cylinder Sonata with 120,000 miles. The PO171 code was on when I got the car. New oxygen sensors were put in before I got the car. I changed the fuel filter, ran every kind of fuel injector cleaner through, another code came up - insufficient engine coolant temp. The car has problems climbing hills and seems to have problems shifting on hills. Also, when cold the car stumbles and has a total lack of any power, unless you let up completely on the gas pedal and you have to do this several times. A mechanic suggested I put in a new fuel pump because the old one was weak. I changed the fuel pump (was a cheap one I bought online - may not be a good one). He also suggested changing the t-stat (which I did) and he said the timing was off a bit. I changed both timing belts but didn't install correctly and ran the car with the timing off. I had to correct the timing. I am afraid I may have damaged valves, however that was 2,000 miles ago. Right before I changed the timing belts, a PO300 code came up and camp up again after the timing belts were changed. A mechanic suggested new plugs and wires (which I did). Every time I made these little repairs the car seemed to do a little better, but codes still keep popping up and the car still has problems on hills, accelerating, and shifting. Just recently I pulled up four codes: PO171, PO335, PO300 & PO725. I will also add that I changed the trans. fluid when I first got the car and used lucas trans fix. I know there is a small trans. leak at the radiator. I have not checked the EGR. Can you please give me some suggestions?


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jan 31, 2011, 7:29 AM

Post #2 of 3 (1302 views)
Re: Multiple codes / Engine problems (Sonata) Sign In

What year is this thing?

O2 sensors can frequently be caused by another fault upstream and not them at all. Quit it with the additives as there isn't a magic fix in a bottle for most anything in a car. Fix the trans leak.

A compression test would help determine if you damaged engine with the timing belt job gone wrong and may be coming back to haunt you now even this long later?

T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 31, 2011, 8:30 AM

Post #3 of 3 (1296 views)
Re: Multiple codes / Engine problems (Sonata) Sign In

You seem to be just creating new problems every time you throw the wrong parts at it. You have a Crank Sensor code now that you didn't have before that you likely caused when changing the belt. This all started with a lean code that was approached in the wrong way. You need to look for the reason you have a lean mixture. It could be a vacuum leak, a problem with the MAF or low fuel pressure among other things



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