zgs400

someone help me please I've got a 1999 gs400 all started with changing oil pan gasket after I change the oil pan gasket I did grease to wash the undercarriage of the motorafter that I had a misfire or what I thought was a misfire thought it would dry out drove it for a few days never went away I've been reading most of these forms for the last week and a half to two week and after getting the car checked he gave me a code of P 1349 but no check engine light ever came up so I change the Vvti sensor same problem same codeso I got tired of Mike are sitting at the shop and I decided to take it to another shop this new shop told me that I had to replace a throttle bodydon't wanna keep replacing parts someone help me pleasecar has 135,000 miles timing belt was done at 105and now the problem seems to be it idles almost at 2000 rpmwhen a first start when its cold car actually gets misfiring wants to shut off after warming up it idles high

tmf2004

iTrader: (15)

(click the link) in that thread post #3. That will bring you to lexusownersclubs website.. People had the same issues and i found this..
https://www.clublexus.com/forums/mai...-99-gs400.html

from lexusownersclub member.. maybe this OCV valve is clogged???

Last night we tested both OCV for voltage> TSB indicates requirement for 5 volts. Left bank was only reading .002 or nothing. Unable to test the right side OCV voltage for comparision since the engine would not run with mass air flow disconnected. Removed the left OCV, tested action and it appears to operate under 12V charge> Cleaned it with carb cleaner and reistalled. Voltage is now to specifications and idle is good, cleared all MIL Codes including the ones we got when removing the air intake covers to access the right bank OCV. Idled egnine in garage with no return of CEL or V V T indicators Plan on driving vehicle to work today and will reply with outcome at road speeds. So far the repair has cost me two beers. May have been a dirty OCV, stuck OCV or a bad harness connection.

nick02895

Just fix it go confirm at another garage that it is in fact the throttle body and fix it you dont want to keep abusing the car whike its misfiring sounds like it cohkd be the problem among multiple things