3800 Engine Operation And Components

3800 v6 engine in pontiac, chevy, oldsmobile, buick. Operation and description.

3.8l Engine oiling and lubrication system.

3.8l Engine mechanical description.

3.8l Electronic engine control systems.

3.8l (3800) sensor locations

3800 Electronic Ignition Operation

3.8L Serpentine Belt Routing Diagram

Live Chat:

Question: do you know what the tubing is called that goes from the top of the throttle body to the back side of the manifold?

Answer: What model in your vehicle are you talking about?

2002 buick century 3.1L.

The black plastic tube?


If I remember correctly that tube goes to the top of the rear valve cover.


I think they just call that the valve cover breather tube.

I have looked numerous places and cannot find a replacement for it. the rubber bushing (or whatever you call it) is warn and does not have a good seal.

Yes, that is a very common problem with that tube. Your best bet is to just go to any GM dealership. They will know exactly what you're talking about. You may have to buy a kit which includes that tube and that seal.

Ok, great, thank you for the help.

You're welcome.

Download Our Ebook

Fuel Economy, Hybrids & Electric, Car Repairs, Recalls And More.

12-10-10 Where is camshaft position sensor?
 The camshaft position sensor on the 3800 V6 is located on the front timing cover. Behind the water pump pulley. If looking straight at the water pump, it is a little to the left.

3-27-10 Location of speed sensor?
 That depends on which speed sensor you are referring to. The vehicle speed sensor is located on the output of the trans. ABS speed sensors are located at every wheel.

4-1-11 where is the oil pressure sensor?
 On the 3800 engine, it is located behind the power steering pump, on the engine block.

4-17-11 If the gasket under the PCV valve cover is leaking is the engine shot?
 Not sure why you are asking this. If the small gasket under the PCV cover is bad- which is not a gasket, it is an O ring- then the seal is JUST bad, and is causing whatever problem your engine is having. It is not the sign of a bad engine.

6-19-11 Where is the crank position sensor located?
 The crankshaft position sensor (CKP) is located behind the crank pulley on the front of the engine.

1-21-12 On a 3800 V6, Series II, VIN K, does the DIS alternate polarity of the coil when firing each set of companion cylinders? Thanks.
 Not really alternating polarity. The module powers one side of the coil, while the other side becomes the ground. Then when the other tower needs to fire, it is switched.

I Own a 1989 Buick Park Avenue 3.8l V6. Check engine code says cam sensor and repair shop says it fell out. Car starts but runs a bit rough. They want $800 and to change timing gear and chain kit...will car continue to run? Or can I just replace cam sensor?
 The part that failed is not the cam sensor, it is the magnet that the sensor reads. The magnet is on the cam gear. You can run without it, but may be hard to start.

Can engine coolant temp sensor display correctly and still provide bad info to the PCM such that when warmed up, the engine idles at 2,500 RPM? Replaced the TPS and IAC sensors, fixed coolant leak at intake manifold-to-throttle body interface, checked sensor connections, and had PCM reprogrammed but still idles fast after warmed up...seems less frequent on cool days.
 Yes, if you have 2 different sensor- one for the gauge/light, and one for the computer. Check for vacuum leaks.

Is there a special way to remove lower intake manifold from series II engine with thick aluminum gaskets.
 No special way to remove them. They come off just like previous 3800 engine.

Where is the transmission control solenoid located on an Pontiac Bonneville 2000.
 All transmission solenoids are inside the sidecover of the trans. But it depends on which one you are looking for. Shift solenoid A, B, pressure control, ETC.

I have a 1989 oldsmobile royal. V6 engine 3.8 liter .Where is the engine temperature sensor.

What would be a resistance range for the temperature sensor? I have a reading of 352 ohms and my gauge always stay at the lowest point.

What is the OHM of the pressure sender for the oil is it between 10 and 180.

3.8 2002 Buick Spark plugs black now likes you start runs for a second then dies as good feel pressure.

I need vacuum line info on 3800 6 cyl supercharged engine.

Where is the Oxygen Sensor? Bank 1 sensor 2 to be exact.

what color of the 2 wires connected to IAT sensor on grand pix 2006 V6.

I as a courtesy, recommend that any person whom has torn the engine down to the point where they can replace the head gasket or intake. Please take the time to replace the seal that terminates the distributor. If u do not do this and a leek begins, removal of the upper intake in the very least will be necessary.

Where is the transmission control solenoid located on a 2000 Pontiac Bonneville?

Help Keep Us Free-
Tip / Donation To the Mechanics

Q and A Main

How Things Work