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Old 01-18-2010, 05:44 PM   #1
TwoFiftyShifter
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Couple issues with 350TBI... related?

My 87 has the 5.7 TBI motor, and has a couple issues.... first the idle fluctuates alot of the time, 500rpm-900rpm and so on, I think it's the intake gasket. However, the truck is either burning or leaking oil. I burnt a quart in 50 miles today.... this happened tihs summer, anjd I got underneath and tightened the oil filter more (probably too much) and its held oil since. I changed the filter lip too, so that's not the issue.... It isnt smoking like crazy, it doesnt leave any puddles on the ground, I just want to know what it could be.
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Old 01-18-2010, 06:04 PM   #2
68c10burb
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Re: Couple issues with 350TBI... related?

some sort of vacuum leak would be my first guess, so intake gaskets may very well be it.

does it run fine everywhere else?
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Old 01-18-2010, 06:15 PM   #3
TwoFiftyShifter
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Re: Couple issues with 350TBI... related?

Yes and I drove it 2.5 hrs last week all highway and got 15mpg....
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Old 01-18-2010, 06:56 PM   #4
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Re: Couple issues with 350TBI... related?

I would do obvious checks for vacuum leaks. Also, do the testing procedures for the IAC. Maybe reset the IAC as well.
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Old 01-18-2010, 07:13 PM   #5
SBTork
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Re: Couple issues with 350TBI... related?

Intake or throttle body leaking vacuum for the first one. Secondly, I would check you pcv system. Check the pcv valve, the tube from it to the throttle body, and so on.
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