PLEASE someone help why is my car doing this!!
07-27-12, 05:18 PM
#1
Pole Position
Thread Starter
PLEASE someone help why is my car doing this!!
What's up CL, I have an 01 GS430 with 112k I've been having this problem with my car for the past few months and I've tried everything from a new MAF, new spark plugs, new air filter, techron gas treatment the problem still occurs but maybe not as bad as before. Basically what happens is if the car has been sitting overnight or at least 8 hours or so when I start the car for the first time the car will sort of shake and rumble for a second like a deep bass sound that can be heard and felt as well as the RPM jumping up and down for about 30 seconds then it stops. Also most of thetime when I first take off when the engine is cold if I press the gas a certain way and not hard enough the car will go but bog out as if the engine loses all the power. Then after it warms up it stops. I can't figure out what this is and neither can my mechanic can anyone please help me ill paypal them $20 for figuring it out lol thanks so much everyone
07-27-12, 06:25 PM
#3
Pole Position
Thread Starter
yes
The throttle body was cleaned months ago and after that was done I noticed the extremely high idle at startup then it eventually went away and idled normal but that was a few months ago so I can't imagine it being the throtttle body again unless cleaning it ruined it?
07-27-12, 06:57 PM
#5
Mortgage Slave
RPM jumping? Try cleaning or replacing the idle speed control valve, on the older 1UZ's it's top centre of the engine e.g. SC400, not too sure on the VVTI ones nor other xUZ engines
07-27-12, 07:30 PM
#6
Pole Position
Thread Starter
No codes that's what's driving me insane. How do I check the pressure? I thought it felt like a fuel pump because of the way sometimes it loses power in the peddle and bogs out
07-27-12, 07:49 PM
#7
tps sensor? or idle air control valve possibly? idk im not a mechanic but had some troubles like that before on an qx4 and cost 4,000 in guessing what it was, i gave up after the 4k and said f-it im getting a new car. finally a sweet 08 is 250 cpo with warranty till 2017 and worry free mee. good luck,
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07-27-12, 08:24 PM
#8
Pole Position
Thread Starter
Damn that doesn't make me feel too good about the situation. I definitely don't wanna spend money on a new car when I jus fixed this one up with struts n motor mounts n everything. I'd only start replacing things if I knew someone replaced it with success who had my problem. You had the exact symptoms as me?
07-27-12, 09:25 PM
#10
Pole Position
Thread Starter
How can I tell if its a bad computer if there's no CEL? I was thinking bad ECU based on a thread I read here but I don't want to replace the ECU for nothing it sounds like its expensive
07-27-12, 10:13 PM
#11
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They sell/rent fuel pressure testers at Pepboys & autozone, on most cars you hook them up on the fuel rail but I'm not sure in these cars.
07-28-12, 03:38 PM
#13
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Seems to me like the throttle positioning sensor is bad, unplug it and see how the engine reacts. This should also throw the check engine light on, if it doesn't the ECU may be bad.