Chevy 3 4 l engine diagram

Chevy 3 4 l engine diagram

General Data. Engine Type. LA1 E. Deck Height. Compression Ratio. Firing Order. Oil Pressure - Warm. Cylinder Bore. Out Of Round Maximum. Taper -- Thrust Side Maximum.

Diameter-Gaged on the skirt 13 mm 0. Pin Bore. Piston Ring. Top Groove Side Clearance. Second Groove Side Clearance. Top Ring Gap. Second Ring Gap. Oil Ring Groove Clearance. Gap with segment at Piston Pin. Clearance In Piston. Fit In Rod. Main Journal Diameter. Main Journal Taper. Out Of Round - Max. Flange Runout - Max. Crankshaft Main Bearing Inside Diameter. Main Bearing Clearance.

3.4 Liter Chevrolet Engines | 3.4 Liter GM Engines

Main Thrust Bearing Clearance. Crankshaft End Play. Crankshaft Flange Runout - Max. Connecting Rod. Rod Bearing Journal Diameter. Rod Bearing Journal Taper - Max. Rod Bearing Bore Diameter. Rod Inside Bearing Diameter. Rod Bearing Journal Clearance. Rod Side Clearance.Typical engine data sensor and control component locations on the GM 3. Click on numbers below image for a description. Fuel pressure regulator 2. Mass Airflow sensor MAF 4.

Throttle Body 5. Fuel Injector 7. PCV Valve 8. Coolant Temp sensor ECT 9. Evap Purge Solenoid EGR Valve Question: I have a Pontiac Grand Prix that stopped running, I have put a new fuel pump, and new computer box on it, but it still wont start.

Do you have spark, fuel pressure, injector pulse, theft or security light on dash, etc. You need to start by diagnosing the basics. Car stared missing, was told it was EVAP purge solenoid. Replaced it and drove fine for short time and problem started again and again was told it was EVAP purge solenoid. Why is this happening over and over again.

chevy 3 4 l engine diagram

What can I do? The purge solenoid would not be causing an engine misfire. It would cause a check engine light yes, but not affect the way the engine runs. I have a Buick Century and in the last month or so the engine started making a noise that sounds as if it were literally was a diesel engine.

When opening the hood one might there was very little or no oil coming up to top end. This would also cause a misfire on that cylinder. Removing valve covers for inspection seems the next step after checking oil pressure.

How do I remove the TPS shaft from the throttle body? It appears stuck from the right side as viewed from the drivers side. The little piece will not come apart on that side to release the shaft.

If you are trying to remove the throttle plate shaft from the body, it cannot be done. If you have a problem, the throttle body needs to be replaced as an assembly. The temperature sensor? Cannot be the temperature sensor or thermostat.

If the coolant is low, you have a leak and need to get it inspected closely.The original engine family was phased out in earlywith its final use as the 4.

Its phaseout marks the end of an era of Chevrolet small-block engine designs dating back to the model year. A new Generation V 4. All engines have cast iron blocks and cylinder heads. The engines are based on the Chevrolet Small-Block engineand the V6 is formed by the removal of the 3 and 6 cylinders. The V6s share the same 4. The oil pan dipstick is located on the passenger side above the oil pan rail; this design was phased in on both the V and Small Block Chevrolet assembly lines for engines manufactured after sharing the same casting dies.

All the engines use a firing order. Being a degree V6, Chevrolet took steps to eliminate the rough running tendencies of the The crankshaft has each of its connecting rod throws offset by 18 degrees for each pair of rods. This required the connecting rods to have 0. However, the connecting rods were still the same 5. It was available only with a 2-barrel carburetor.

The smaller Dualjet carburetor caused a slight decrease in power.

GMC Chevy 4.3L Vortec Engine Serpentine Belt Routing Diagram with AC

These engines should not be confused as being the same, and are completely unique engine designs. It came equipped with 1. The 4. To create a true even fire engine, Chevrolet produced a crankshaft with degree offsets between each rod pin. The connecting rods used on the 4. In andthe 4. Inthe rear main crankshaft oil seal was changed from a two piece to a one piece seal. Some model year vehicles would have a engine due to service replacement - cylinder blocks were shipped with oil pans.

For the model year, the 4. The balance shaft on the 4. It is gear driven off the camshaft timing sprocket, and therefore a new timing chain cover was required for these balanced 4. Balance shaft engines do not have provisions for a mechanical fuel pump unlike the non-balance shaft motors which retained the cast in boss. As of the model year, the 4. The only vehicles using the 4. As of March 7,the last 4. Chevrolet Performance still lists the LU3 motor in their product catalog. Mercury Marine, which sells its engines under the MerCruiser brand developed the 4.

Inthe 4.On Sale. Garage Sale. Tell us what vehicle you drive so we can help you find exactly what you're looking for. Help is just a click away! Products to Compare max of 3 X. You've Selected:. Clear All. Select Your Vehicle. See More Filters. Sort by: Relevance Selected.

Show: 30 Results. Driveline and Axles. Air and Fuel Delivery. Ignition, Charging and Starting. Electrical, Lighting and Wiring. Tools and Equipment. Trailer, Towing and Cargo. Cooling and Heating. Headers and Exhaust. Chassis and Suspension. Apparel, Gifts and Literature.The GM 3. Top on the list are leaky intake manifold gaskets that can literally destroy the engine if not fixed promptly.

The 3. The engine is an enlarged version of the 2. GM made a dual overhead cam version of the 3. The issues: Leaking intake manifold gaskets. Both the 3. Over time, the plastic would soften and the seals would leak. That would allow coolant to seep into the crankcase, or allow oil to seep out of the intake.

At the time GM had recently switched over to DexCool coolant and it was blamed for the leaking gaskets. DexCool gets a bad rap on this one. GM offered settlements to owners. GM has gone through several variations of gasket designs to solve the problem. If you own the 3. Always install NEW intake manifold bolts with a new gasket. Reusing the old bolts will guarantee a future failure.

And, as you disassemble the intake, remember that the exhaust and intake push rods are a different size. Do NOT mix them up. They must go back in the exact same hole as before or you will get tappet noise.

MAF sensor problems. The early generation MAF sensors used with these engines are prone to dirt, carbon, and fuel vapor varnish buildup. The crud builds on the sensing wires, insulating them from the airflow and causing the computer to miscalculate load and cut back on fuel.

The oxygen sensor sees the lean condition and forces the computer to add fuel. This would show up on a scan tool as short and long term fuel trim add. That additional fuel can cause early catalytic converter failure.

The symptoms of a dirty MAF sensor are; rich or lean trouble codes, poor gas mileage, rough idle, black smoke from exhaust or P, P, and P Clean the sensor wires with MAF sensor cleaner available at any auto parts store. Unlike the cheaper Haynes and Chilton manuals that cover multiple year models, leaving the exact information you need to fix your car, these professional manuals cover your exact year, make, model.

General Motors 90° V6 engine

Plus, they contain full trouble code descriptions and troubleshooting instructions. Pricing: Eautorepair. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. However, Alldatadiy. If you need to dig into your doors, dash or console, Alldatadiy.

3.4 Chevy Motor Problems

Find this article useful?The Chevrolet 3. Though this engine has seen constant improvement over the years, no amount of evolution will ever eliminate all of GM's notorious engineering flubs.

chevy 3 4 l engine diagram

One stands above all others in this engine family as both easily preventable and endemic, but is nonetheless responsible for countless engine failures and malfunctions. The main cooling system problems with this engine are manifest in those cars with the third-generation engine, produced i the to model years. The problem begins as a minor external cooling system leak and eventually develops into a full-blown flood.

Less-observant owners have often tfound themselves sitting on the side of the road with an overheated engine and a sizable repair bill. The problem is that, for whatever reason, GM didn't realize that it's newest super-coolant DexCool was going to eat the intake manifold gasket. The intake manifold lies in between the engine's cylinder heads and carries not only air and fuel, but water.

The water that flows through the manifold is extremely hot and under a great deal of pressure, meaning that it can put a lot of strain on the gasket-mounting area. Combine this with DexCool's corrosive nature, and it's small wonder that owners have had problems. Though a complete fluid flush and replacement with standard "green" anti-freeze is possible, there is no guarantee that you will get all of the old coolant out.

DexCool and green anti-freeze are like oil and water; the two will not mix in your coolant system, and their separation will ultimately cause cooling system failure.

chevy 3 4 l engine diagram

Some owners have replaced 3. This has been the default solution for many years, but a more permanent one was offered by GM a few years ago. The General opted not to replace the corrosive DexCool that came stock and has instead offered for sale a new intake manifold gasket that should resist breakdown. To be fair, the 60 Degree V6 has always been a fairly reliable and low maintenance engine family.

This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.

To submit your questions or ideas, or to simply learn more about It Still Works, contact us. Fluid Flush Though a complete fluid flush and replacement with standard "green" anti-freeze is possible, there is no guarantee that you will get all of the old coolant out.

Gasket Replacement Some owners have replaced 3. Repair To be fair, the 60 Degree V6 has always been a fairly reliable and low maintenance engine family. References Carcomplaints. About the Author This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.

Photo Credits Image by Flickr.One of the most common problems on the GM 3. This problem has been a gold mine for GM and the auto repair industry. So, you might be wondering, is there a way to prevent this from happening?

The answer is both a yes and no. Having worked on cars as a professional automotive tech for about 20 years and having repaired this condition many many times, I can tell you that you can do certain things to avoid a repeat of this problem. In this article I'll offer you several suggestions on what you can do to mitigate this problem. In a nutshell, it's because the intake manifold gaskets are made out of a composite material the technical name for plastic.

Compounding the problem is that the metal that the intake manifold gaskets are sandwiched between, expands when it heats up and contracts when it cools down remember, the intake manifold gaskets are sandwiched between the intake manifold and the cylinder head -which are made up of aluminum metal.

This eventually results in gaskets that look like the one in the photos I'm using in this article. Once out of warranty If you do own a vehicle equipped with a 3. Is there something that can be done to avoid a repeat of this particular problem? The answer is yes and it involves using an updated type of intake manifold gasket made by Felpro and tightening the intake manifold bolts with a torque wrench to specification.

Whether you replace the leaking intake manifold gaskets yourself or you're having it done at your local automotive repair shop Because the old plastic type gaskets are still being produced and sold. Not too mention that there's a price difference between both.

Now, in case you're wondering what the heck is the difference between them The updated gaskets have a metal shim type core with rubber gaskets lining the ports as opposed to an all plastic core. Using the updated metal shim type intake manifold gaskets is just only one part of the equation. The other factor, that also determines whether the new or even the standard intake manifold gaskets are not going to leak for a long time is torquing the intake manifold bolts to their proper torque specification.

To make sure your intake gasket replacement doesn't come back with a coolant leak in the near or long term GM skimped on both the amount and size of the bolts used to keep the intake manifold bolted to the cylinder heads. What I mean is that these are small diameter bolts that have a very small tightening torque specification.

You can buy the updated metal shim type intake manifold gaskets for a whole lot cheaper than somewhere local. The following links will help you comparison shop for the updated gaskets that also include the valve cover gaskets you need to remove in order to get to the intake gaskets :. Not sure if the above updated intake manifold gasket sets fit your particular vehicle?


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