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1999 lexus rx300 2,4,6, cylinders cut out at highway speed.


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ernest419
New User

Jun 17, 2015, 5:00 PM

Post #1 of 4 (871 views)
1999 lexus rx300 2,4,6, cylinders cut out at highway speed. Sign In

1999 Lexus rx300 has cylinders 2,4,6, cut out at highway speeds. Works fine under 40mph. Replaced both VVT valves, spark coils, intake manifold gasket. Could the computer cause this. Car has over 300,000 miles on it.


Discretesignals
Ultimate Carjunky / Moderator
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Jun 17, 2015, 5:29 PM

Post #2 of 4 (865 views)
Re: 1999 lexus rx300 2,4,6, cylinders cut out at highway speed. Sign In

Any trouble codes stored in the engine computer? If so, what are the numbers? How did you figure out a whole bank cuts off?





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ernest419
New User

Jun 17, 2015, 5:33 PM

Post #3 of 4 (862 views)
Re: 1999 lexus rx300 2,4,6, cylinders cut out at highway speed. Sign In

Don't know the codes, I will find out . My mechanic drove it with his device hooked up and it told him what was missing.


Discretesignals
Ultimate Carjunky / Moderator
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Jun 17, 2015, 5:43 PM

Post #4 of 4 (860 views)
Re: 1999 lexus rx300 2,4,6, cylinders cut out at highway speed. Sign In

Would interesting to see what kinds of fuel trims he/she is getting on his/her scan tool for both banks. Also looking at VVT data pids would be important to see how the ECU's VVT command compared to actual. Could have some sort of exhaust restriction on that bank, such as a clogged cat. Could run a back pressure test. If the computer is killing injector pulse or spark on that whole bank, which would be extremely unusual, she/he would see that with a lab scope.

Was any work performed prior to this occurring?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jun 17, 2015, 5:44 PM)






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