VipBippu08

iTrader: (5)

So i'm very new to this site. Just bought a 02 GS300 w/ 100k miles on her and decided to do the timing belt service.. Got all original part/oem parts. Put it all back together and now she runs rough at idle. Over 1500rpm she's fine. Check engine light is on at idle but goes off at 1500rpm then starts to blink. Code is p16C56 (ocv sensor??) possibly low oil pressure? Car was running perfect when I bought it.

Any help would be greatly appreciated!!

Johnny Rad

Turn your headlights on. Does it go away?

VipBippu08

iTrader: (5)

I dont think the headlights has anything to do w/ it. I'll try it anyways tomorrow..

To correct myself, the DTC was p1656 (ocv malf bank 1).

sjlexus408

iTrader: (4)

you might want to check the connection on your ocv valve or take it apart and clean out the filter there might be oil sludge in there due to mileage.

GS4_Fiend

iTrader: (22)

You mean oxygen sensor bank 1. If the CEL is blinking, your catalytic converter is going through meltdown. Bad misfire would cause that.

VipBippu08

iTrader: (5)

its has a misfire only at idle.. but if i rev it up to about 1500 or 2000rpm, its ok and the CEL goes away. Real nice and smooth.. its only at idle that its struggling.. I'll try to clean out the filter on the OCV and see how it goes from there..

thanks for all the response so far guys..

Debonair

P1656 has nothing to do with O2 sensors or cats.

Debonair

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VipBippu08

iTrader: (5)

thanks for your input Debonair.. i think i might have a bad vvti cam gear..

VipBippu08

iTrader: (5)

any Lexus techs here???

nokcy21

iTrader: (1)

did you double check the timing marks? check it again, put cylinder 1 on top dead center then check the cam gears and crankshaft pulleys are at its timing marks. happen to me once at the shop found out one cam gear jump one tooth.

FrankT

x2 check your timing marks...
and let us know what you find.

VipBippu08

iTrader: (5)

Timing marks are dead on.. Thanks for the reminder though.. I ordered the VVt-i cam gear but they said its on back order.. dont know when it will be in.. *sigh*

The fustrating part is that the car ran PERFECT prior to this.. Now i have to wait till god knows when... arrrrrh!!!

JeffTsai

iTrader: (1)

There is no reason for that cam gear to crap out unless the mechanic working on the car messed it up. If the shop isn't experienced with working with a VVTi setup then they might of removed the wrong bolts. On the VVTi pulley there are 5 small bolts holding the assembly together and 1 big one holding the pulley to the camshaft. If those 5 bolts are removed, it will knock the internal assembly on the pulley out of alignment. In the Toyota service manual it says if those 5 bolts are removed the fix is to replace the pulley.

I would check the VVTi solenoid filter and the connector first before anything else. The filter is only like a $10 part. The pulley on the other hand is about $150!

VipBippu08

iTrader: (5)

The pulley is actually $187.86. One quick thing that I just found out..

The crank sprocket (behind the crank pulley) has a missing tooth. I quickly located a used one and it is in route to me right now. Hopefully this fixes the problem, if not then I know for sure I will need the left VVt-i cam gear.. Well see today..

Again.. thanks for all inputs..