How do u check vacuum leaks on a 97 5.7l chevy vortec engine

If your 1991 Chevy's 4.3 Vortec engine has spark and fuel, but still fails to ignite, there are several possible reasons to consider. Timing: Make sure the burn time is set correctly. Incorrect timing can prevent the engine from starting. Double-check the timing marks to make sure they align properly. Compression: Make sure the engine has adequate compression. If the pressure is low in one or more cylinders, starting problems may occur. A compression test will help determine this. Fuel Delivery: Even though you said it has gas, pay close attention to the fuel delivery system. Make sure the fuel pump is working properly, the fuel filter is clean, and the fuel lines are not clogged or leaking. Air intake: Inspect air intake for blockages or leaks. A clogged air filter or leaking intake manifold gasket can affect engine performance. Vacuum leaks: Check the vacuum lines and connections for leaks. A vacuum leak can cause an uneven mixture of air and fuel and cause starting problems. Sensors: The engine relies on sensors to send information to the computer unit (ECU). Defective sensors such as the crankshaft position sensor or camshaft position sensor can prevent the engine from stalling. Wiring and connections: Ensure all electrical connections are secure and non-corrosive. Damaged wiring or loose connections can block signals to engine parts. ECU/PCM: The engine's computer (ECU/PCM) can be faulty, preventing proper signals from reaching the engine components. Distributor cap and rotor: If your engine uses a distributor, inspect the distributor cap and rotor for any signs of wear or damage.

Codes indicate engine is running lean (bank 1 and bank 2). This is usually an indication of a vacuum leak - usually sizeable. Check to ensure that you have reconnected all vacuum lines, especially the power brake booster. The next suspect if all vacuum lines are properly connected is the intake manifold. As you have just replaced the gasket, you may want to double check that all fasteners are in and properly torqued.

Ghost, Check the attached links vacuum line diagrams for 1993 4.3 vortec, Good luck
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Repair Guides Vacuum Diagrams Vacuum Diagrams AutoZone com
4 3 vortec vacuum diagram Google Search

Troubleshooting a Blown Head Gasket (GM 4.3L, 5.0L, 5.7L)

troubleshootmyvehicle.com > GM > 4.3L, 5.0L, 5.7L

Mar 28, 2011 - There are so many ways to test for a blown head gasket on your 4.3L, 5.0L, 5.7L GM van (or mini-van, pick up, SUV) that it can get confusing.

Chevy Blazer Coolant Leak (Intake Manifold) - YouTube

? 4:33
https://www.youtube.com/watch?v=SC4VXdt5wiE
Oct 9, 2013 - Uploaded by eyetotheworld
I have localized a coolant leak on my 2003 Chevy Blazer to thegasket of the intake ... Turns out that this is common among this particular engine both in the v6 & v8 sizes. ... The guy has been generous to detail his projects. ... 98 S10 Vortec V6 4.3 IntakeGasket Replacement Part 1 of 5 - Duration: 18:17. by ...

Chevy 4.3l v6 oil leak issue 2001 Xtreme Blazer - YouTube

? 6:11
https://www.youtube.com/watch?v=Y8Ogd5voIYs
Nov 12, 2011 - Uploaded by smiatacz
This darn little engine just keeps going. ... I have a 2003 chevy blazer and the oil cooler line from the oil filter to ... I have a 95 Chevy s10 v6 vortec 2wd that is slightly dripping oil out of agasket ... I'm having same problem 2001 Chevy Blazer 4x4 (not xtreme) not sure if those same bolts are missing on mine.

Since it's a '95 that takes the vortec engine out of the equation. The '95 has a TBI (throttle body injection) system, which is basically an electronically controlled carburetor. When was the last time you had a tune up? If it's over 100,000 miles, I'd start there. It might smooth out things. Other things to look for are vacuum leaks. good luck.

This could be anything from a bad vacuum leak to bad ignition coil to spark plug wires to distributor cap and rotor or ignition coil. From the sound of this I would look to the vacuum leak or the EGR.

have you checked sensor connections around intake. check for any broken or cracked vacuum lines. check for vacuum leaks around plastic portion on intake, {i'm assuming you have the 4.3L vortec engine} if all this is good then have fuel pump pressure tested.

thats usually a sign of a vacuum leak, recheck and make sure you don't have any loose hoses, or cut intake seals

1st thing to check is the intake manifold for vacuum leaks, also check and make sure the EGR valve is not leaking when it is closed, to check the intake buy a can of carb spray and sray around the top of the engine, if a leak is present there will be a very noticeable change when the spray is near the vacuum leak. To check the EGR Valve start the engine cold, wait a minute or 2 then spray water on the EGR, if it steams up the water it is leaking exhaust into the engine, this will cause a rough run as well.