You have to remove a Chevrolet V8 intake manifold to fix two usual problems. This contains the slow and mysterious loss of engine coolant and also a inspect engine light the leads to a knock sensor problem. You"ll discover these problems on generation two and also generation 3 Chevrolet V8 engines native the mid-1990s with the 2007 model year.

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Although these space the 2 most usual reasons to remove the top plenum and lower parts of the input manifold, these are not the only ones. In fact, whenever you remove a cylinder head or perform any kind of kind of significant engine work you"ll should remove the intake manifold. What you see once you first take turn off the part might surprised you. From the factory Chevrolet provided a composite intake manifold gasket do of plastic and also silicone. Due to the fact that the gasket is delicate and could crack from over tightening, general Motors uses a very light torque spec measured in customs pounds. Therefore, they mounted thread locking compound on the manifold bolts to avoid them indigenous backing out.

This becomes an important point to make together we move our means down come the repair ar below. What i want civilization to recognize from this post is that boosted gaskets are currently available. And also unless you have a bench grinder v a cable wheel, you might think about getting brand-new bolts.

You can remove the plastic and also silicone gaskets and also go with a steel and also rubber assembly from Fel-Pro and other suppliers. It"s not often that ns recommend one aftermarket components solution. I"m a solid believer in AC Delco and General motors replacement parts. V that said, whenever I have actually a possibility to replace something plastic with parts made the end of metal, i go because that it. The other important allude to make is the replacement of the hit sensors and wiring harnesses if you have the input manifold removed. This poor style eventually fails as the plastic connectors disintegrate indigenous heat and also age. In addition, water gets down roughly the punch sensors and causes corrosion issues. The component of this that amazes me is the amount of vehicles that have actually experienced this trouble or will certainly in the future. This leads me right into the next section wherein we"ll talk around the symptoms associated with these usual problems and the engines many affected.

Symptoms of an input Manifold Problem

Before we talk around the symptom of the Chevrolet V8 intake Manifold problem let"s talk around the massive amount that vehicles affected by this issue. The plastic and also silicone gaskets mounted from the factory discovered their way into generation two and also generation 3 V-8 engines. This has the renowned 5.7 together Vortec V8 and the collection of V-8 engines that replaced the legendary tiny block Chevy. The generation 3 engines had the displacement selection of 4.8 L, 5.3 L, 6.0 L and even the mighty 8.1 l V-8 truck engine. Note: I put the Vortec V6 trouble on a different page.The symptom of this input manifold trouble usually start with a low coolant light. In the beginning a straightforward topping turn off of the coolant reservoir takes care of the worry for weeks or also months. However, as the leak choose up speed motorists realize they have actually a problem that requirements resolving.

Unfortunately, as soon as they go to search down the engine coolant leak, they usually discover no indications of such a leak. This is due to the fact that the intake manifold gasket is allowing coolant to slip past and down into the crankcase.

These little droplets will not harm the engine in ~ first. In fact, periodically the leak is so slow, the water boils off, leaving no signs of a problem. If chauffeurs ignore the short coolant level they"ll often hear gurgling in the heater system.

This i do not care a authorize of air pockets in the system. Mine mom"s Chevrolet Cruze developed a coolant leak from the thermostat housing, but she didn"t tell me until she had no heat. A one-of-a-kind note around cracked Chevrolet V8 input manifolds. In most situations we find gasket failure, but on rarely occasions you could see a cracked intake.


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Cracked Chevy intake Manifold

This usually outcomes from too much overheating. A cracked manifold leaks coolant into the combustion chamber. Failed gaskets leak coolant right into the crankcase.

Therefore, the symptoms between the 2 situations come to be different. Through a cracked manifold you see white smoke indigenous the tailpipe and the engine operation rough. These frequently crack on the within making it difficult to see. 

Finally, the last symptom to discuss requiring the removal of the input manifold is the punch sensor problem. The inspect engine light comes on and usually set a code P0327. Long story short, basic Motors set up plastic connectors that don"t hold up end time. As the connector weakens therefore does the connection and an intermittent signal to the PCM cause the P0327 trouble code.

Chevrolet input Manifold Parts


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Chevrolet intake Manifold Gasket Set

There space a couple of things I desire to talk about in this section. After ~ performing the repair over and over again, ns learned a few tricks that make the job easier. V that said, critical part that this fix is gaining the right parts for the job.When I eliminated the plastic and also silicone gaskets mounted from the factory, i felt a little nauseous. You plainly see just how profoundly the gaskets failed. The last thing I want to do was buy an additional plastic composite item of junk. This gaskets gain sandwiched in between two significant engine parts. At an initial Delco to be the only video game in town, yet now Fel-Pro stepped up and provides better parts.I don"t commonly go throwing roughly the word better on the stclairdrake.net website, but to me, that"s what lock are. Fel-Pro replaced the plastic through a stainless steel metal gasket utilizing heavy-duty rubber inserts. The component alone reduce the possibilities of repeat failures because of that is construction. This is terrific news for civilization who shot to perform this fix without an inch pound speak wrench.

On the old plastic gaskets if you end tighten the entry manifold bolts you will certainly crack the brand-new gasket and it will leak badly. This leader me right into the next section whereby we"ll discuss the entry manifold bolts themselves.

When you remove the factory installed bolts you discover that the threads have actually a liberal amount of subject locking link on them. You have the right to reuse this bolts, however you need to clean all of the old adhesive off and also then reinstall fresh thread locking compound. In some instances people take it a shortcut and also skip this steps.

The old glue stops you native smoothly torquing the input manifold bolts on reassembly. The torque specification is critical in this operation. The tightening pattern and also torque specification room in the repair ar below. The bolts have a tendency to earlier out if you don"t install fresh thread locking compound.

For this factor I now include the replacement bolts in the estimate. This means I don"t need to wire wheel, eight individual bolts and then apply messy thread locker. I"m no saying the you have to do this, however if friend don"t you leaving the opportunity open of a repeat failure.The following thing come talk about is the hit sensors and also the wiring harness replacement parts. This is a hard one due to the fact that the AC Delco hit sensor components are about $45 apiece. The wiring exploit goes for around another $25. Aftermarket companies have bundled these contents together that lug a really attractive price tag. Here"s my trouble with conserving money in this area. On several occasions I‘ve supplied an off brand instead of knock sensor and it didn"t work. This becomes a huge deal, because now you need to take everything apart again. I"m not saying you won"t ever come throughout a bad Delco hit sensor, but in mine opinion it would seem much less likely.

Chevrolet V8 intake Manifold fix Procedure

Since I pointed out the speak of the entry manifold bolts number of times in this article already, let"s handle this issue first. The tightening pattern is a typical spread pattern the starts in the center and also works its means out by alternating sides.

You have the right to see a video of exactly how it"s excellent on YouTube. V that said, the important component of the procedure is come torque the bolts to 44 customs pounds top top the very first pass and also then 89 inch pounds on the 2nd pass.

This is time-consuming and people often look to take a shortcut. This is not a good idea due to the fact that a shortcut on this action of the operation becomes one of the leading causes of repeat failures. The second cause of having to pull the Chevrolet V8 input manifold again is fail to usage a thread locking compound during the installation.

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People don"t often realize, once you install a thread locker, it provides a smooth also torque lubricant. The compound only locks the bolt in place when it’s fully dry in around an hour or two.

You can find an inch pound torque wrench because that 25 bucks in ~ the freight ar or loaned one indigenous the neighborhood parts store. Don’t shot to guess: v what 89 inch pounds feeling like. I’ve to be doing this 30 years and I can’t execute it without the tool. We filed this Chevrolet V8 intake manifold short article in the maintenance and also tune-up section. If you own one of these Chevrolet trucks us have additional diagnostic and also repair steps you"re sure to find helpful. Take a look at the Chevrolet van ignition switch issue and then have actually a look at the oil press switch story. Finally, learn around the plastic Vortec V8 engine distributor problem.