Vacuum Leak?!?
#1
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Vacuum Leak?!?
O.K. Team ClubLexus I need your help!!!
I have a 98 GS400 with 402,000 miles (not a typo).
When I first start her up she sputters a little, usually stalls. After several attemps and after warming up a bit I can take her out on the road. She accelerates slowly at first, usually get a misfire or two, but once the car reaches 2,500 to 3,000 rpm it kicks in and runs smooth and true. I have been told that I have a vacuum leak and was hoping with the support and expertise of all of you, that I may be able to resolve the issue myself. What I am looking for is, basically, where to start, what to look for, best way to find a vacuum leak, best place to get replacement hoses, etc.
I look forward to your help, thank you in advance !!!!!!!!!!!!
-Steve
I have a 98 GS400 with 402,000 miles (not a typo).
When I first start her up she sputters a little, usually stalls. After several attemps and after warming up a bit I can take her out on the road. She accelerates slowly at first, usually get a misfire or two, but once the car reaches 2,500 to 3,000 rpm it kicks in and runs smooth and true. I have been told that I have a vacuum leak and was hoping with the support and expertise of all of you, that I may be able to resolve the issue myself. What I am looking for is, basically, where to start, what to look for, best way to find a vacuum leak, best place to get replacement hoses, etc.
I look forward to your help, thank you in advance !!!!!!!!!!!!
-Steve
#2
Instructor
Wow with that many miles, how much oil do you use?
Your symptoms suggest you might have low compression when cold.
I would try and do a compression test on all cylinders.
Not many vacuum lines in the 400 look at them all...
Good luck and welcome
Your symptoms suggest you might have low compression when cold.
I would try and do a compression test on all cylinders.
Not many vacuum lines in the 400 look at them all...
Good luck and welcome
#5
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Any thoughts/opinions/answers as to why the engine changes how it performs after reaching the 2,500-3,000 rpms? Does the engine change it's air intake at that point? i'm curious why the mechanic I spoke with said definitely a vacuum leak.
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jcpatin76
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03-25-12 07:35 PM