BOWTIE_3
Senior Member
Posts: 468
Loc: Va. Beach, Va.
Reg: 04-16-02
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01-22-08 08:03 PM - Post#1348904
My neighbor's '02 Silverado [ 1500, 5.3, 76,000 miles ] had a miss at idle. The shop at the corner runs a scan and says it's an intake manifold leak. He buys a gasket at Advance Auto supply but decides to let the corner auto shop do the job. They say they can't use the gasket from Advance Auto so they use one of " their's ". They complete the job $300.00 later and tell him that it's a " common " problem on the 5.3 and 4.8 Chevy engines. Neighbor says it has solved the periodic miss at idle. My '01 has 55,000 miles on it. Is the intake manifold leak really a " common " problem and something that I should be looking ahead to or is the corner shop just Dodge/Ford guys that are full of B$?
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HokieNav
Senior Member
Posts: 468
Loc: Now racing the Beltway Ba...
Reg: 03-17-05
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01-23-08 05:44 AM - Post#1349097
In response to BOWTIE_3
Not "common" in the sense that it happens to everyone, but it isn't all that unusual.
To diagnose, start up the truck and spray a little bit of carb cleaner around the edge of the intake manifold - if the idle speeds up when your spray it on a certain area, that's the carb cleaner getting sucked into the intake - bad gasket.
| "Only two things are infinite, the universe and human stupidity, and I'm not sure about the former."
- Albert Einstein |
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Randy_W
Honored Member
Posts: 25399
Loc: Delmarva Penninsula
Reg: 01-06-02
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01-23-08 01:20 PM - Post#1349374
In response to BOWTIE_3
Way more common on the '99-'02 trucks, my Tahoe had to be replaced in the high 70k range. 
Randy
"Okie in Residence"
"The veneer of civilization is very thin!" (Arlo) |
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Squasher
Very Senior Member
Posts: 1726
Loc: Northern California
Reg: 07-05-02
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01-24-08 08:16 PM - Post#1350494
In response to BOWTIE_3
it's possible the gasket leak is on the inside of the manifold where carb spray wont make a change in idle. But then you might have an oil consumption problem.
as long as you are spraying around the intake runners, you may want to spray around the throttle body and PCV valve and other vacuum lines.
2001 GMC Sierra K1500 Z71 x/cab SLT 5.3L
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HokieNav
Senior Member
Posts: 468
Loc: Now racing the Beltway Ba...
Reg: 03-17-05
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01-25-08 05:54 AM - Post#1350674
In response to Squasher
Yeah, I should have mentioned that while it would prove you definitely have a leak, it wouldn't prove for sure that you don't.
| "Only two things are infinite, the universe and human stupidity, and I'm not sure about the former."
- Albert Einstein |
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Alex Ross (4)
