Hey guys,
I recently bought myself and Ls430 2004.
After a short time the check engine light came on together with trc off and the check VSC warning.
I also noticed that the car does not have constant power and takes a long time to accelerate. Also the gear changes are very rough and chaotic. The car doesn't know which gear to chose at what time. I had an 2001 ls430 before and the gears where so much smoother and the power delivery was perfect so I know what I am talking about here.
Also when I rev the car with full power in a parked position it always takes a second for the engine to rev up. Before it revs up it just sounds like if it's clogged or doesn't get enough fuel or something.
I went to a mechanic and we checked on the old and it read the two codes P0171 and P0174 left and right bank engine to lean.
So I changed the MAF sensor. After changing the MAF it felt like the car was accelerating a bit better without hesitation. Still rough gear changes.
Today I checked again if the car would run better with the MAF unplugged. With the MAF unplugged there are a few changes:
-When revving the car with full power the rev counter starts to rise without any hesitation
-With the MAF plugged in the Rev counter first stutters in the first second (feels clogged) and then starts to rise as normal
-also the car shifts a bit cleaner with the MAF unplugged but just a bit. Still a bit of hesitation with acceleration and gear changes
-what I also noticed after driving for a bit longer with the MAF plugged in the car even starts to have clogged accelerations so it gets worse when driving for a longer time
So maby the MAF works but it gets bad readings because there is a vacuum leak somewhere. When MAF is unplugged a friend told me that it takes some general non related values so that's why it probably rans a bit better when the MAF is unplugged.
I hope someone has an idea on what to do next.
Thanks to everyone in advance.
Cheers Guys
