Chevrolet 3.4 engine diagram

Collection of chevy truck wiring diagram free. A wiring diagram is a streamlined conventional pictorial depiction of an electrical circuit. It shows the elements of the circuit as simplified shapes, and the power and signal connections in between the devices. A wiring diagram normally offers information concerning the relative position and plan of devices and terminals on the gadgets, to assist in structure or servicing the tool.

A pictorial representation would certainly show extra detail of the physical appearance, whereas a wiring diagram utilizes an extra symbolic notation to stress affiliations over physical look. A wiring diagram is frequently made use of to repair issues and making sure that the links have actually been made which whatever is present.

Click on the image to enlarge, and then save it to your computer by right clicking on the image. A wiring diagram is a kind of schematic which makes use of abstract photographic signs to show all the interconnections of components in a system. Circuitry representations are made up of 2 things: signs that stand for the elements in the circuit, and lines that stand for the links in between them. Circuitry layouts mostly shows the physical setting of elements and links in the built circuit, but not necessarily in logic order.

It emphasizes on the layout of the cords. Schematics highlight on just how circuits work practically. To review a wiring diagram, first you need to understand just what fundamental aspects are included in a wiring diagram, and also which pictorial symbols are used to represent them. The typical components in a wiring diagram are ground, power supply, cable as well as link, output gadgets, buttons, resistors, reasoning gate, lights, and so on. A line represents a cable. Wires are made use of to link the elements together.

All factors along the cord equal as well as linked. Cords on some locations have to cross each various other, but that does not necessarily indicate that they connect. A black dot is made use of to suggest the order of 2 lines. Main lines are stood for by L1, L2, and so on. Normally various colors are used to identify the cords. There need to be a legend on the wiring diagram to inform you just what each color suggests. Typically circuits with more than 2 parts have two basic kinds of connections: collection and parallel.

A collection circuit is a circuit in which parts are linked along a solitary path, so the existing circulations through one part to obtain to the following one. In a collection circuit, voltages accumulate for all elements linked in the circuit, and currents coincide through all parts. In an identical circuit, each tool is straight linked to the source of power, so each gadget gets the exact same voltage. The existing in a parallel circuit flows along each identical branch and re-combines when the branches meet once more.

A good wiring diagram has to be practically correct and clear to review. Care for every information.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.

Chevy 4.3L 262ci V-6 - The 3/4 350

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.

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It was available only with a 2-barrel carburetor. The smaller Dualjet carburetor caused a slight decrease in power. 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.

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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. The LB1 used in trucks and vans was referred to as Vortec in Chevrolet literature named after a combustion chamber design known as a swirl port which twists the fuel mix from the intake ports as introduced on the Cavalier 2.

Inthe Chevrolet full size pick-ups and full-size vans were upgraded to use the LB4 throttle-body injection version of the 4.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.

chevrolet 3.4 engine diagram

Gap with segment at Piston Pin. Clearance In Piston. Fit In Rod.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.

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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.

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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.

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.I have an 04 Chevy venture with the 3. Unsure what kind of line. There is one also on the driver side towards the front of the manifold that has a cap over it. Looked at Chilton's and Haynes and cant seem to find what goes to it. If you place your finger over the nipple it causes the motor to die down.

Not completely At first though it ran to the tranny later realized it can the tranny is all electric. All of the diagrams I look at get me no where.

Do you. Do you see the vacuum port on either of the pictures I attached? If so, can you describe its location for me? Images Click to enlarge. Was this answer. Yes I do see it I circled it on the pic with paint.

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I also see that it has no hose or line attached to it. The thing is when you block off that nipple the motor dies down a lot and then eventually stalls out. I also know there is on near the front drivers side that looks like it has a OE Cap on it. Every picture that I have looked at it has shown one with a hose the one that is capped off on my van and the other one that is not capped off has a line going to it.

Severely confused. Image Click to enlarge. Ok, some of these engines did use a vacuum hose at that fitting. If there is one, it will be located on the back side of the engine near the 3 ignition coils. It will have a 90 rubber elbow on the end of it. It will be a small diameter hard plastic line. If you don't see one of these lines, place a rubber cap over the port.

Either way, it should not cause the vehicle to stall out. You may need to clean the inside of the throttle body to remove any carbon deposits to give the vehicle the proper airflow.

The nipple to the front of the manifold is already capped.

chevrolet 3.4 engine diagram

So I am to cap both of them?See all 17 photos. We were more excited to buzz this turkey on the dyno than we usually are with some whumpin' big-block. It's different.

Not too many people build V-6s any more. Perhaps we found out why, but we still think it's neat-or at least cute. See, the 'up Chevy 4. They're common in 'up trucks, and we still get so many letters asking how to feed a V-8 to an S truck that this time we elected to answer the question no one asked: How do you get more wheeze out of the stock 4.

chevrolet 3.4 engine diagram

But first, a little V-6 lore. The units we're concerned with are the Chevy degree variety, meaning that the cylinder banks are set at a degree angleto each other, just like a small-block V The bore centers 4.

The 'up 4. Any V-8 trans will bolt right up to the degree sixer. The 4. Not that 4. The even-fire 4. There are also common-pin V-6 cranks they look just like conventional V-8 cranks developed for the Chevy V-6's Busch Grand National racing days, but those are odd-fire units. Like the Chevy V-8, the degree V-6 saw some transition during production: factory hydraulic roller lifters, one-piece rear-main seals, and center-bolt valve covers all appeared in '' Just like a V-8, one-piece-seal cranks can be swapped into two-piece-seal blocks with commonly available adapters.

Our pick was the Speed Pro LWF, a lightweight forging grams with four valve reliefs with 6. The rings are Sealed Power R file-fits set at 0. The V-6 is known as a shaker, so we had Dougan's Engine do a precision balance job. Dougan's was able to modify Milodon ,psi rod bolts for a application just by clearancing the heads a bit, as shown on the right.

See how two rods arrows on the same journal are offset a bit? They're also separated by a cast-in thrust surface, and hence, the rods are narrower than a V-8's. The Milodon main studs and oil-pump stud were sourced from a V-8 application. Combined with stock heads that Dougan's checked at 68cc chambers, pistons that we set at an average of 0.

Stock was 8. Because we changed plans midstream and decided to someday try the Vortech blower for carbs on this engine see the story in this issuewe asked Dougan's to mill a 3. For now, it runs fine on cheap gas.

chevrolet 3.4 engine diagram

He cut a few inches off the front, enlarged one bolt hole arrow to clear the dipstick tube, and tweaked a few louvers to fit the stock oil pan. You can use conventional short- or long-water-pump accessories on the 4. We also wanted a steel balancer in case we ever add the blower, and we needed an SFI-approved balancer for the track.

Dougan's found that the Pioneer balancer PN on the right is a 6. Off-the-shelf cam grinds are pretty tiny for use with the OE computer-controlled applications that house most of these engines. The cam kit PN K comes with cam, lifters, retainers, locks, seals, timing set, valvesprings, pushrods, guideplates, and rocker studs. So our pick for a simple, budget, performance V-6 would be an ''92 unit without a balance shaft, and we have a slight preference for the earlier units with perimeter-bolt valve covers.

They just look better, and based on our inspection of junkyard heads, we suspect that the early ones flow better. But avoid the and heads, which have 1.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. 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.


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