Yeah Yeah I know, it isn't a truck, but I value your opinions and advice
here and afterall it is a Chevy!! So here goes.... by buddy has a 97 Chevy
Venture that he has just bought. It has 150,000 km on the clock. It appears
that it may be running on the original spark plugs. Very badly worn. He
wants to change the plugs and is unsure on how to access the rear plugs. It
is a V6 engine. Anyone know the procedure to R&R the rear spark plugs on
this vehicle? As usual your advice and help is very appreciated. Also any
advice on what plugs to buy? Platinums?
Glenn, The venture came with platinum plugs from the factory, they
recommend changing at 160,000km. I would use the same AC plug it came
with. On the rear plugs you need some universal extensions. Really arent
as bad as they look. Scott
Use Delco platinum plugs, good for 100k miles, and not standard plugs good
for 24k miles or so. On vehicles where the plugs are hard to get at,
Platinum is always your best bet.
He'll have better luck going at the rear plugs from underneath than he will
from on top. Lots of socket extensions, wobble extensions and a universal
joint will come in very handy.
I've changed the plugs on my 98 Montana at 85K miles and they would have
easily made it to 100K miles. The procedure I used was to remove the two
upper engine supports, rock the engine forward and secure in the forward
position. I had to remove the coil packs for added clearance but with the
engine rocked forward there's enough room with the right combination of
extensions to get at the plugs. The engine must be cold otherwise you risk
seizing the plugs. Not saying it can't be done from the bottom but I don't
have ready access to a hoist.
You didn't ask:
You can also get to the pre convertor O2 sensor with the engine forward.
By removing the upper manifold you can get to the thermostat when it needs
serviced. Remove some wiper linkage and the alternator will come out....
As for plugs, stay with platinum, in fact, I recall they are "double
platinum". With a 3 coil, 6 cyl. engine, 1 coil fires 2 cyls. One plug
fires electrode to ground, the other fires ground to electrode.
I'll pass the info on to my buddy. After posting this question I inquired
more into his problem.... with his van I mean. He told me that the plugs
looked very worn down on the centre electrode. He said that they were very
pointy!! Ha!! I said are you sure those aren't platinum's?? The look on his
face...priceless!!! Anyway he's still going to change out the plugs,
probably time anyway.
So...here's how this got started. He had the venture in to a transmission
shop because there is a problem that he describes as a shudder/surging at
around 85km/hr +. The shop couldn't find anything wrong but did a tranny
flush (at his request). Problem is still there. So he decided to do a
tune-up starting with the plugs.
So..... any known probs with a 97 venture with regards to a tranny
shudder/stumble? Also note that I have not test driven this vehicle myself
and my friend's second language is English and sometimes has a trouble
describing things to me. Maybe this is the TC locking up/unlocking that he
feels???? I will post more info when I know more.
Glenn, The Venture came with platinum plugs. At 85km you are right as the
speed where not only is the tc locking and unlocking but also cycling in
and out of overdrive. Thats an electronic trans , usually if anything
serious goes on the check engine light will come on. If your friend has
not had a automatic overdrive before it just may be a matter of getting
used to it. Scott
I passed the info on to my buddy, he changed out the plugs for new
platinum's, NGK I believe. Anyway he says that the van runs perfectly now.
Thanks for all your help guys. Doc, he changed the plugs as you suggested,
from underneath. About 1.5 hrs to change out the 6 plugs. Thanks again.
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