Leak Test for Intake Manifold?
Thread Starter
Pro
Joined: Jun 2001
Posts: 509
Likes: 5
From: Edmonds WA
Leak Test for Intake Manifold?
Having been getting P0101 (MAF) and PO300 (Random Misfire) codes, intermittently, for a months, I noticed I could smell coolant recently. I talked to a service guy at the dealership who suggested that it was probably the intake manifold gasket and said it was a common problem with th 5.7L with 100K+ miles. He suggested a leak test to confirm.
Has anyone had a leak test done? Just wondering how it's done and how confident you can be in the results (i.e., pinpointing the problem).
I've read other posts that have said the fix for the P0300 and P0101 codes was replacing the intake gasket. At first, I thought it was extreme, but maybe that's the realy problem. The codes typically show up on freeway trips when climbing a hill at 2500+ RPM for a few minutes. So, it could make sense that air is getting in downstream of the MAF.
Has anyone else had to replace the intake manifold gasket to fix this problem?
Has anyone had a leak test done? Just wondering how it's done and how confident you can be in the results (i.e., pinpointing the problem).
I've read other posts that have said the fix for the P0300 and P0101 codes was replacing the intake gasket. At first, I thought it was extreme, but maybe that's the realy problem. The codes typically show up on freeway trips when climbing a hill at 2500+ RPM for a few minutes. So, it could make sense that air is getting in downstream of the MAF.
Has anyone else had to replace the intake manifold gasket to fix this problem?
Instructor
Joined: May 2001
Posts: 127
Likes: 1
From: Yorba Linda, CA,,,USA
Why does coolant come into play with a manifold leak? I'm going to be pulling my manifold off to replace the oil pressure sending unit. This is a plastic manifold. Is there coolant circulating through it like the old cast iron and aluminum manifolds? I got the gasket kit and it just contains 8 rubber seals and a couple blocks of foam with adhesive.
Pro
Joined: Feb 2004
Posts: 718
Likes: 1
From: barrie ontario
Why does coolant come into play with a manifold leak? I'm going to be pulling my manifold off to replace the oil pressure sending unit. This is a plastic manifold. Is there coolant circulating through it like the old cast iron and aluminum manifolds? I got the gasket kit and it just contains 8 rubber seals and a couple blocks of foam with adhesive.
Team Owner
Joined: Jan 2004
Posts: 22,185
Likes: 65
From: NJ
Having been getting P0101 (MAF) and PO300 (Random Misfire) codes, intermittently, for a months, I noticed I could smell coolant recently. I talked to a service guy at the dealership who suggested that it was probably the intake manifold gasket and said it was a common problem with th 5.7L with 100K+ miles. He suggested a leak test to confirm.
Has anyone had a leak test done? Just wondering how it's done and how confident you can be in the results (i.e., pinpointing the problem).
I've read other posts that have said the fix for the P0300 and P0101 codes was replacing the intake gasket. At first, I thought it was extreme, but maybe that's the realy problem. The codes typically show up on freeway trips when climbing a hill at 2500+ RPM for a few minutes. So, it could make sense that air is getting in downstream of the MAF.
Has anyone else had to replace the intake manifold gasket to fix this problem?
Has anyone had a leak test done? Just wondering how it's done and how confident you can be in the results (i.e., pinpointing the problem).
I've read other posts that have said the fix for the P0300 and P0101 codes was replacing the intake gasket. At first, I thought it was extreme, but maybe that's the realy problem. The codes typically show up on freeway trips when climbing a hill at 2500+ RPM for a few minutes. So, it could make sense that air is getting in downstream of the MAF.
Has anyone else had to replace the intake manifold gasket to fix this problem?
Sounds like the service guy doesn't know much about LS engines and he may be talking about the old vortec 350's. The LS engines do not have a wet intake. The codes you mentioned don't really have anything to do with coolant either. P0300 is really common when catalytic converters go bad or you have a lean condition due to a vacuum leak.
You may have a vacuum leak at the manifold which can cause this. I have always checked for manifold leaks using carb cleaner or a propane sniffer. Warm the car up and spray the carb cleaner around the manifold, the idle will jump up when you hit the leak.
