98GS300-2

I still won't hold my breath for at least a week...problem could come back and it could be purely coincidental that it "fixed" itself at the same time I seafoamed it. Knowing my luck this is just the calm before the storm. Engine will probably blow up in my face next week! So far this car has been about as reliable as a plastic steak knife and requires about 10x the general maintenance as my other vehicles have.

jvince512

Oh thats what that is! thanks. Well I drove the GS and same thing again and on the way home the check engine started to flash this time, well I'll find out tomorrow what the hell is worng with it. Could it be time to move to the third generation GS?

jcat_350

question....i may have overlooked it but at any point did you think to investigate cam and crank position sensors?

jvince512

In my case I honestly hope its going to be the timing.

jcat_350

if you're exhibiting the same signs as the OP, check the following:


-plugs
-fuel filter
-REPLACE ocv filter (not just clean)
-maf
-crank position sensor
-cam position sensor
-check for a plugged cat

jvince512

Well I changed the oil control valve and changed the sparkplug with original Denso and ordered the OCV filter. I also got the codes erased, I drove it about 20 miles back home and no check engine light drove smooth I'll keep posting

wbmx1981

Good to hear! Did you feel a difference with the plugs? I need to do mine. I have 152k and have not chnaged them yet.

98GS300-2

Sorry I have been away from the internet for the weekend! What is the procedure for testing the proper working of the cam and crank position sensors?

jcat_350

well...i'd imagine the only real way to do so would be to get a known good gs400, and test the voltage/resistance outputs of each sensor with a multimeter, then test them on yours to look for any variation.


My best advice would be to just swap it out. Since you're getting VVTi codes, my guess is cam sensor. However, given that the crankshaft also has something to do with timing, if the cam sensor doesn't fix it that would be my next guess. Outside of those 2 sensors, I cant think of anything else but an ECU.

98GS300-2

Well the thing "fixed" itself again as I left work. Lights all shut off again and it ran fine...now how long til they come back on!

jvince512

Yes, I noticed a difference in gas and power. The next thing to do is change out the 3 coil packs just because my car has about 168k and wanna keeping it going.

$119.77 cam shaft timing oil control valve part#15330

$5.60 oil control valve filter part#15678

$10.05 Toyota Denso spark plug part#90919

Coming Soon
$131.06 a coil pack

Austin, Tx market

daryl stit

I thought I would share my story, as this site has helped me tremendously during my 1394 issue...

1998 GS400 (170k miles)

After having my CEL and VSC/VSC OFF lights come, I took the car into my mechanic. He stated that 1394 code came up, and I would eventually learn the others (P0300, P0301, P0303, P0305, P0307) too. All of these codes point to Bank 1 (drivers side). Due to it having to do with the VVTi, they recommend I take it to Lexus. After a week of research (This site rocks!!) on various boards, I basically came to the conclusion that it was OCV. Initially, i looked to pull the OCV myself (which is quick simple actually). However, I chose to take it back to the shop (self admitted novice wrench) and I have a multi year trust relationship with them. So I went back to them and told them i wanted them to replace the drivers side (Bank 1) OCV. BINGO!

It has only been 1 day, but my baby is purring like a kitten again. Purrrrrr...

I hope this helps someone...

DS...

ivnnln

iTrader: (1)

Did you happen to know where the OCV located on your GS400? I would like to swap mine out too, but can't find it. Do you mind taking a snapshot of the unit so I can reference to mine as well. Thank so much.

bruceb58

Sea Foam is such a complete waste of money. All it is as Naptha Isopropyl alcohol and some oil. It will not do half of what the advertising claims.

ANTW1

Daryl, Is your car still riding smooth after replacing the OCV?