Your mixing up engines.
The Chevy is the 3.1/3.4L derived from the 2.8.
They are a 60 degree engine with a problem of coolant sometimes getting in the
oil destroying the engine.
The 3.8 L is a 90 degree engine as is the 4.3 although they are of different
The common problem with the the 3.8 is an external leak.
Roger Seymour wrote:
I have a 94 4.3 that had a bad intake gasket. It seeped just a little
bi at the front of the driver's side gasket. Just look at your oil,
if it looks milky, you're losing coolant into the oil. Mine was
external, looked like it was coming from the head/block interface so I
was getting estimates for replacing the head gaskets. I lucked out.
Found a mechanic that told me to get the parts and he'd do it for me
in his back yard.
You don't see as many posts about the 4.3 engines, but they have/always had
the same intake problems as the v-8's. The later model 4.3's that are the
Vortecs with the plastic upper plenum use the same style gasket as the
Vortec v-8's. We do lot's of intake gaskets on both v-8's and v-6's. It's
usually just a matter of time.
What year/VIN code engine (See the 8th position in the VIN for VIN
code). If W, you may have an injector/regulator/nut kit (dunno why GM
calls fuel lines a nut kit) leak. I replaced the injector, which
includes the FPR, and the nut kit on mine last year. Time consuming
but not all that difficult of a task...
On Wed, 13 Aug 2003 02:58:25 GMT, "eightupman"
Hmmm... indeed. Just before my fuel pump failed, my 4.3 was taking somewhat
longer to start up. I hadn't really paid much attention, but my son took
the truck one day, came back and said "Hey, Dad, have you noticed......" It
ran OK once going. Then, out of the blue, it just died at the side of the
road with zero warning - not a hiccup... nothing. The mechanic who replaced
the pump told me that the mechanical injectors need about 55 psi to work
right. When he tested it, it was only giving about 30 psi. Anyway, $340
later I was on my way. Kinda stumped me since I could still hear the pump
run when I turned the key. Thought at first I'd lost spark.
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