CEL misfiring
#1
CEL misfiring
so I was driving on the highway I felt the car shutter a little bit when I let off the throttle, A minute later my CEL and vsc/vsc off came off came ON, I stopped the idle speed is at like 4-500 rpm's, the feeling is just like a misfiring is happening, I went to advance auto to pull the codes, it comes back with 7 codes all leading to engine/misfiring the following:
p0300,1349,1346,0307,0305,0303,0301
I get back on the highway and Im going at normal speeds, she drives smooth, If i slow down she hesitations starts again, once I got off the off ramp the shakes start again. please help....TPS perhaps codes dont lead to that though...
p0300,1349,1346,0307,0305,0303,0301
I get back on the highway and Im going at normal speeds, she drives smooth, If i slow down she hesitations starts again, once I got off the off ramp the shakes start again. please help....TPS perhaps codes dont lead to that though...
Last edited by RI-Lex; 02-04-10 at 01:30 PM.
#2
Lexus Test Driver
iTrader: (7)
I just had the same problem (albiet with only the 1349 and 1346 codes), and after much searching on CL, determined it could be a dirty/bad oil control valve, VVTi controller, or a couple other options, including something as simple as running Seafoam through the car... (run a search, you'll see.)
Anyway, got frustrated and took it to the dealer -- they told me the valve cover grommets were worn and shriveled and leaking oil into the cylinders causing misfires, and need replacement -- afterward if needed they could continue to diagnose. BUT, in the process of their pokin' around the car the cleared out the CEL/VSC/VSC OFF lights and they haven't come on since!! Yeah!
I'm still replacing the VC grommets, but I think now I'm gonna wait till its warm out!!
Anyway, got frustrated and took it to the dealer -- they told me the valve cover grommets were worn and shriveled and leaking oil into the cylinders causing misfires, and need replacement -- afterward if needed they could continue to diagnose. BUT, in the process of their pokin' around the car the cleared out the CEL/VSC/VSC OFF lights and they haven't come on since!! Yeah!
I'm still replacing the VC grommets, but I think now I'm gonna wait till its warm out!!
#5
I disconnected the negative on the battery, half hr later connected again, all lights off, drove for about 20mins, all lights back ON, but no rough idle at stop lights or while driving it seems to accelerate fine.
P1346 VVT (Variable Valve Timing) Sensor/Camshaft Position Sensor Circuit Range/Performance Problem
(Bank 1) / 18
P134921 VVT (Variable Valve Timing) System Malfunction (Bank 1) 22 / 59
P1346 VVT (Variable Valve Timing) Sensor/Camshaft Position Sensor Circuit Range/Performance Problem
(Bank 1) / 18
P134921 VVT (Variable Valve Timing) System Malfunction (Bank 1) 22 / 59
Last edited by RI-Lex; 02-05-10 at 04:01 AM.
#7
I dont believe is the timing belt or nor do i think it stretch in anyway, because according to the codes the cylinders misfiring are all in bank 1, 1/3/5/7, I also had my electrical system check today, alternator, and battery, I knew it cant really be the issue but i wanted to start my check list with that. does the 400 actually have a oil control sensor or is just the 300?
can anyone post a link of the diagram of the 400 block?
can anyone post a link of the diagram of the 400 block?
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#9
Driver School Candidate
Join Date: Jul 2005
Location: ca
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Replace the OCV (Bank 1), which is on the drivers side. Easy DIY if you feel like it.
Check this thread... GOOD INFO.
https://www.clublexus.com/forums/gs-...eads-help.html
Check this thread... GOOD INFO.
https://www.clublexus.com/forums/gs-...eads-help.html
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