How To Change Out A Thermostat On A 3800 Buick Engine Youtube

Buick 3800 Engine Problem Diagnostics

Common Problems with the 3800 Engine:
An intermittent chuggle or hesitation that can be felt during light dispatch or while cruising at highway speeds with no Check Engine light or no fault codes set may exist caused by intermittent operation of the automatic transmission torque converter clutch (TCC). The problem is non the torque converter clutch or clutch solenoid, but a faulty input to the powertrain control module computer from the engine's throttle position (TPS) sensor. The fix for this trouble is to replace the TPS sensor.
Vehicles that may be affected past this include the following:
1995-1999 Buick Riviera
1995-2004 Buick Majestic
1995-2005 Buick LeSabre, Park Avenue
1997-2005 Buick Century
1995-2001 Chevrolet Lumina
1995-2002 Chevrolet Camaro
1995-2005 Chevrolet Monte Carlo
2000-2005 Chevrolet Impala
1995-1997 Oldsmobile Cutlass Supreme, Ninety Eight
1995-1999 Oldsmobile Eighty Eight
1998-2002 Oldsmobile Intrigue
1995-2002 Pontiac Firebird
1995-2003 Pontiac Chiliad Prix
1995-2005 Pontiac Bonneville
with 3800 V6 Engine (VIN K – RPO L36)
Intake Manifold Coolant Leaks
The Buick 3800 V6 is a adequately reliable engine, only coolant leaks on the Serial II 3800 engines with the plastic intake manifold have been a problem. The OEM intake manifold gasket tends to deteriorate afterwards 60,000 or so miles in the surface area that seals the cylinder caput coolant passage to the manifold. The fix is to supplant the intake manifold gaskets.
Intermittent Hesitation While Accelerating or While Cruising
Intermittent Misfire While Driving
An intermittent misfire that occurs while driving may exist caused by a weak roll or worn spark plugs. The distributorless ignition system on the 3800 V6 is a waste spark system with three ignition coils. Each pair of cylinders shares a mutual ignition coil. Cylinders that are opposite one another in the engine's firing club are paired so their spark plugs share the same coil. This reduces the total number of coils needed. When each gyre discharges its high voltage output, information technology fires two spark plugs simultaneously: one when cylinder is on its compression stroke, and the other when the cylinder is on its exhaust stroke.
They call it a "waste material spark" organisation because the plug that fires on the frazzle stroke does nothing. But the plug that fires during its compression stroke produces power. Even so, both spark plugs experience roughly twice the electrode vesture that spark plugs in other types of ignition systems undergo (considering the fire every engine revolution rather than every other engine revolution).
Remove and inspect the spark plugs. Replace the spark plugs if whatever are plant to be fouled or worn. The spark plugs should be gapped to .060 inches. If the spark plugs appear to be okay, inspect the ignition wires. High mileage wires (those with over 100,000 miles on them) tin develop increased resistance that may crusade the engine to misfire. Replace whatever wires that are cracked, fit loosely or are damaged.
If the plugs and wires are okay (or you've replaced them), and the engine nevertheless experiences misfires, use a scan tool to check for misfire codes. The Cheque Engine light should exist on, and at that place should be one or more than misfire codes for the cylinders that are misfiring.
The last digit on a misfire code indicates the cylinder number. A lawmaking P0302, for instance, would tell you cylinder #2 is misfiring. Chances are the misfire is due to a weak ignition coil.
The three ignition coils on the 3800 engine fire cylinders six and 3, 2 and 5, and 1 and four. If you lot notice misfire codes for any of these paired cylinders, you can exist sure the problem is a bad ignition gyre and not something else such as lean misfire caused past a bad fuel injector, vacuum leak or EGR leak, or compression misfire due to leaky or sticky valves.
Ignition coils can exist replaced separately on the ignition module. But if one coil is bad, it may be a good idea to supplant all three on a high mileage engine to prevent like problems down the route.
Engine Cranks But Won't Start
There are a variety of possible causes for a no start, but ane of the most common with the 3800 engine is a bad crankshaft position (CKP) sensor or a bad ignition command module (ICM). The crank sensor contains two hall effect sensors that sends two signals to the engine computer. A problem with the sensor or the wiring connection between the sensor and computer can prevent the computer from receiving a cranking signal. Without this bespeak, it tin can't showtime the engine.
The crank sensor has 4 circuits: a 12-volt reference circuit, a low voltage reference circuit, and two signal output circuits.
NOTE: If the crank sensor is bad and needs to be replaced, a special relearn process must be performed after the new sensor has been installed using a GM scan tool or an aftermarket scan tool with similar software. This stride is necessary and so the engine computer can correctly recognize the sensor'due south signals.
Diagnosing the crank sensor requires looking up the engine wiring diagram for your vehicle, then testing the voltages for the diverse crank sensor and ignition module circuits to notice the fault. With the cardinal on, you should detect about four to 8 volts betwixt each of the creepo sensors two output circuits and the low voltage reference circuit. If the creepo sensor tests bad, it needs to be replaced. The sensor is located on the forepart of the engine under a encompass behind the crankshaft pulley. If the crank sensor tests adept, the problem is likely the ignition control module, a mistake in the ignition wiring harness, or possibly a fault in the engine computer.

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