4.3 vortec engine , engine noise, knocking or tapping on top of engine, not when cold , but starts noise when it heats up, and gets louder as it gets hotter and hotter!!! Sounds like noise is in the center of engine!!!!
Posted by Steven... on
The knocking or ticking is going to determine if it is in the top end, lifters, push-rod or rocker arm issue or the bottom end that would include pistons or bearings.
If it is a ticking noise, it will more than likely be a valve train issue.
If a knocking noise, piston or crankshaft related problem.
Attached is a web site that you can listen to a piston slap which is a known issue for your 4.3.
Listen to the noise and see if it sounds similar to your problem. A piston slap will generally sound as though it is coming from the central area of the engine.
Listen to the recording and let me know.
Posted on Apr 19, 2009
i checked the codes and one comes up its po446. i dont under stand what it mean so i cant fix it to get the light to go out.
Posted by rspitfiref... on
P0446 Evaporative Emission System Vent Control Circuit.
The following are descriptions of all Evaporative possible codes:
P0441 Evaporative Emission System Incorrect Purge Flow
P0442 Evaporative Emission System Leak Detected (small leak)
P0443 Evaporative Emission System Purge Control Valve Circuit
P0444 Evaporative Emission System Purge Control Valve Circuit Open
P0445 Evaporative Emission System Purge Control Valve Circuit Shorted
P0446 Evaporative Emission System Vent Control Circuit
P0447 Evaporative Emission System Vent Control Circuit Open
P0448 Evaporative Emission System Vent Control Circuit Shorted
P0449 Evaporative Emission System Vent Valve/Solenoid Circuit
P0450 Evaporative Emission System Pressure Sensor/Switch
P0451 Evaporative Emission System Pressure Sensor/Switch Range/Performance
P0452 Evaporative Emission System Pressure Sensor/Switch Low
P0453 Evaporative Emission System Pressure Sensor/Switch High
P0454 Evaporative Emission System Pressure Sensor/Switch Intermittent
P0455 Evaporative Emission System Leak Detected (large leak)
P0456 Evaporative Emission System Leak Detected (very small leak)
P0457 Evaporative Emission System Leak Detected (fuel cap loose/off)
P0458 Evaporative Emission System Purge Control Valve Circuit Low
P0459 Evaporative Emission System Purge Control Valve Circuit High
At least the cap isn't loose for the gas tank.
I would clear the code with an OBD-II Scanner 'erase code' button, and see how long it takes for it to come back.
Posted on Aug 06, 2010
Where is the clutch cycle switch located on 1996 GMC Jimmy? There is no power to the clutch and the fuses are okay, so I assume this is the problem
The a/c clutch is attached to the front of your a/c compressor. It is the part that your serpentine belt runs on. It is either engaged or not based on the demand of the a/c system. It will not run if it senses low pressure in the freon supply line so you might try having the system checked for proper fill before replacing the clutch.
Posted on May 29, 2009
in need to change the fuel pressure regulator but I need to know where a 4.3l engine
Posted by gabrielar5... on
The fuel pressure regulator is mounted inside the intake plenum. You'll have to take the top half of the intake plenum off and replace the fuel injection spider.
Posted on Jan 16, 2011
The air blows from defrost, in front window, and it blows out at the feet but the face vents will not allow any air, hot or cold or from outside blow through, what do I do?
Posted by tlthomas on
check the hoses connected to the vacuum advance ball, it has probably begun to decompose...
Posted on Aug 11, 2008
no brake fluid to the rear wheel cylinders
Posted by tropicalch... on
You'll need to start bleeding the brake system at the Master cylinder to determine where the problem lies.
The lines coming out of the master cylinder will need to be loosened & bled there, initially you can just do the back ones to identify the problem, but once fixed, the system will have to be bled from the Master cylinder first, then the farthest wheel from it, then next farthest, then next, until you do the drivers wheel last.
This method of bleeding the brakes prevents air from crossing from one line to another, causing air to be left in the system.
Back to bleeding the rear brakes first: As someone pumps up the brake pressure, making sure the resivoir stays full, with the cap on between bleeding, and have the person pressing the pedal to do these thngs.
1. Always move the pedal slowly, pressing and releasing.
2. Never release the pressure on the pedal after bleeding a brake, until the line is tightened, then release slowly to prevent air from getting into the fluid.
You should of course get fluid at the master cylinder when you bleed it (or just replace it), then you'll need to bleed the line at the right rear wheel (first) a few times to get fluid if it's been leaking, then the left rear wheel. If you get pressure but no fluid to the rear and the master cyliinder did have pressure released when you bled it, there is either a restriction in the line itself, or the porportioning valve could be damaged. (unusual for the valve to go bad actually, inspect lines for damage such as being pinched if you're getting pressure but no fluid.
Final test if it hasn't been resolved-remove lines at porportioning valve & make sure fluid is leaving/entering there as it should. If you find it defective, a good replacement can come from a salvage yard, or you can buy them new.
Brake fluid on the floorboard under the dash near the brake pedal=bad Master Cylinder.
Posted on Feb 21, 2010
gear shift lever wont go into park; there's no problem with transmission or fluid vehicle works fine but i cannot get the shift lever to go into park, also i can remove the key while its in the reverse slot engine off of course
I have a Dodge Charger 06 model and the gear wont move from Park to reverse. everything else works as far as gas, brake light, etc but my gear wont shift can i get soem help
Posted on Oct 18, 2009
1996 GMC Jimmy the back hatch door will not open. I tried remote button, button on dash, and manually by inserting key and trying handle from inside. What could fix this?
Posted by Kerry... on
You can try disconnecting the battery cable then try to openit with the key There is an electrical switch they call it the actuator its inside the tailgate trim panaland easy to replace This sounds likely to be what your problem is the switch may be shorted and in lock mode all the time
Posted on Nov 04, 2010
DISTRIBUTOR FIRING ORDER ON 1996 GMC JIMMY
Posted by Lashone... on
I am thinking about buying a 1996 gmc jimmy and the gentleman said that the vehicle won't shift from 1st to 2nd. Is this something easy to repair and expensive? This is what the ad says.
Trans slow in shifting from 1st to 2nd. But as auto stick No problem...
What does this mean? I am a single mom who lives in the country and I am in desperate need for a safe vehicle for winter. Can anyone guide me in the right direction. Honesty is what this girl needs.... Thanks
Posted by rodeogirl on
IF the abs dash light is on and if the speedometer is sluggish or not working at all, it is probably a bad speed sensor on the transmission. and easy fix under $40 for the part. Mine was stuck in second gear for a while then worked then it stuck in first gear and i had the CHECK ENGINE light on.
Posted on Dec 15, 2009
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