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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

RPMs increase while on the brake

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Old Aug 10, 2009 | 07:23 PM
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xxRONNIExx's Avatar
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Default RPMs increase while on the brake
Havent drove my car in about 2 weeks. Jumped in it today and it really started acting funny. While at a stop light my RPMs started to increase while my foot was on the brake. Oil levels were jumping up and down as well.
Acceleration wasnt as good as it usually is.
Once I got home I could also see smoke (exhaust) coming into the car. Check under the car and smoke was coming from the pipe exhaust near the passenger door.Pipes looked wet as if it had oil or maybe tranny fluid on it. Not sure where to start first.
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Old Aug 10, 2009 | 07:31 PM
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Find out what it was on the exhaust (oil/tranny fluid/coolant) then it will give you a clue as to what is going on and where to look.
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Old Aug 10, 2009 | 07:41 PM
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Originally Posted by My95Z
Find out what it was on the exhaust (oil/tranny fluid/coolant) then it will give you a clue as to what is going on and where to look.
Agreed. Maybe your rear intake seal blew and you now have a vacuum leak and a oil leak. But that's just speculation until you find the real problem.
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Old Aug 10, 2009 | 08:00 PM
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Okay thanks guys....I'll do that first.
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Old Aug 10, 2009 | 08:51 PM
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Okay I checked under my car and I do have an oil leak. So Im thinking when Im driving the dripping oil may be flying back to the exhaust ( but not positive). It is oil.
Now why would my RPMs start increasing when Im at a stop light with my foot on the break as well as my oil temp gauge?
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Old Aug 10, 2009 | 09:35 PM
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if the rear of the intake mani seal is busted it can do both. it did with mine at least
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Old Aug 11, 2009 | 01:00 AM
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Yep sounds like a vacuum leak causin the RPM to increase when the brakes are pulling vacuum and oil gauge to bounce around. I'm puttin money on an intake leak...
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Old Aug 11, 2009 | 01:32 AM
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definately intake leak, no biggie.
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Old Aug 11, 2009 | 12:56 PM
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Originally Posted by 93TAJ.C.
definately intake leak, no biggie.
So whats the best route for me to fix the intake leak? Never did it before.
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Old Aug 11, 2009 | 12:59 PM
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remove the intake manifold and replace it with a new one. Actually not bad of a job.
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Old Aug 11, 2009 | 12:59 PM
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Originally Posted by xxRONNIExx
So whats the best route for me to fix the intake leak? Never did it before.
You have to remove the intake manifold and reinstall it with new intake manifold gaskets and a nice thick bead of RTV on the front and rear block rails.
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Old Aug 11, 2009 | 01:10 PM
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Originally Posted by ss.slp.ls1
You have to remove the intake manifold and reinstall it with new intake manifold gaskets and a nice thick bead of RTV on the front and rear block rails.
Okay thanks guy..man I just cant seem to stay from under this hood (always something)...
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Old Aug 11, 2009 | 01:36 PM
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its an LT1.lol
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