GS - 2nd Gen (1998-2005) Discussion about the second generation GS300, GS400 and GS430 (1998 - 2005)

Random rough idle

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Old 04-20-14, 08:45 AM
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islexusred
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Default Random rough idle

Hey guys! My 98 lexus Gs400 has this idle issue! The rpm just up and down ( not too much) but I can feel it and make the car shake while doing it, it's like the car is about to die. Recently I've replaced all 8 spark plugs, timing belt, water pump, tps, engine mounts, all 4 o2s, cleaned throttle body plate and mass air flow sensor. I do change my engine and Transmission fluid regularly.
Old 04-20-14, 09:29 PM
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lexfreak22
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Originally Posted by islexusred
Hey guys! My 98 lexus Gs400 has this idle issue! The rpm just up and down ( not too much) but I can feel it and make the car shake while doing it, it's like the car is about to die. Recently I've replaced all 8 spark plugs, timing belt, water pump, tps, engine mounts, all 4 o2s, cleaned throttle body plate and mass air flow sensor. I do change my engine and Transmission fluid regularly.
Have you done anything with your iacv? It could be dirty and could be sticking.
Old 04-20-14, 11:57 PM
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islexusred
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Originally Posted by lexfreak22
Have you done anything with your iacv? It could be dirty and could be sticking.
I thought the Gs400 does not have an IACV! if it does then where is it located?
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