Last post on Nov 03, 2013 at 4:31 PM
You are in the Chevy Venture
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Chevrolet Venture, Engine, Van
#7 of 405 Head gasket and rattles - A long story
Mar 06, 2007 (6:17 pm)
Hi, I am a fully qualified mechanic with 20 years plus experience, my chevvy venture van (160k) ran great and had no noises/rattles or issues. i am having no success in curing a severe top end rattle. If youre sitting comfortably , i'll begin. My wife was driving along and said the van lost power, then it picked up ok, then a bang and lots of smoke. she stopped and we had the vehicle towed home. When i tried to start vehicle for diagnostic purposes, it ran poorly and had a regular top end rattle, like a very loose lifter. After usual diagnostic tests i decided to remove the cylinder heads. The rear gasket was completely shot at #6 cylinder and i noticed #1 chamber was extremely clean, indicative of it leaking also. The sump was filled with coolant. I fitted an aftermarket head set ($270+tax) and refitted heads, new oil and filter etc. When i started her up she ran sweet, no misfire but a nasty rattle(same as before). After little success finding origin of noise i removed inlet manifold and double checked my work. No loose lifters, pushrods in correct place, etc etc. Was told it could be lifters damaged after dexcool entered sump, replaced all lifters($24+tax each), rebuilt and had exactly the same noise. Sent van to local garage to check over. He removed inlet manifold, compared my heads etc to a venture he had in for head gasket repair. He checked oil pressure, rockers etc found nothing, charged me $250 + tax and returned van without refitting any parts. Suggested the aftermarket gaskets may be thicker and i might try having heads shaved. Had the heads shaved and fitted new gm gaskets ($270 Heads + $160 for gm gaskets and of course taxes). Fitted heads again! (yes with another set of bolts). Guess what - still have the same rattle. still sounds like atleast 2 valve clearances are 40 thou too big. The van runs great. have even driven it up the road for a few k. lots of power, no misfires, rattle is audible whilst driving. Any one still awake after reading this and has any suggestions please feel free to respond.
#8 of 405 Re: Head gasket and rattles - A long story [rattles]
Mar 22, 2007 (7:40 pm)
Sounds like you got the head gasket problem resolved. You are very luckey you can do all your own work and order many of the parts "at discount" prices.
For your "audible whilst driving" noise, the sound might be coming from 2 different areas. The one area to check is its front wheel bearings. If wheel bearings are going, the front end while hum - while driving. The faster one drives, the louder the hum is. In some vehicles, sound travels under the vehicle and echos between its body and ground. Thus, the sound may "sound like" its coming from the engine area but it might be coming from under the engine. Being a Mechanic, I'm sure you know how to check for worn out wheel bearings.
The other area to check for "audible whilst driving" sound is the AC clutch. My previous 2000 Sunfire had a weird humming sound under its hood. Sometimes it would squeek and sometimes it would hum. Most of the time, it would hum. My local mechanic used a doctor's stephoscope (no kidding) and placed its sound pickup end of every engine part. Really cool to watch because he would say, "nope - not the water pump", "nope - not the idler pully", etc. etc. as he put the sound pickup end on every steel engine part. Finally, he nailed it. Found it was the bearings (steel sleeve) on the AC clutch assumbly that was gone.
If you can, try to use a doctor's stephoscope to hear that "sound under the hood" as well. Especially if you can hear the "audible whilst driving" sound while its tires are turning - while the vehicle is on blocks. And yes, do be very careful when turning tires - when the vehicle is on blocks.
Hope this helps as well.
#9 of 405 chevy venture engine issues
Jun 06, 2009 (9:49 am)
hello? i'm looking for some help out there. i just bought a car ...three days ago, after inspection, insurance and a quick trip to pick up a friend, my 2001 chevy venture is shot. First at a stoplight on my way to the insurance company it died, started right up and proceeded on, about two hours later of back and forth driving , on my way up a hill it statred to make a weird rattle sound(knocking) my friend assured me it was the motorcycle up the road yet i knew better. i finishe dgetting up this steep hill and yeap ther was a really loud knocking. my friends man came piucked us up and said it sounded like a rod or a lifter. the perrson i bought it from said ther was a new engine put in it. with warranty. is taht transferrable? who does the work, etc etc. and if not what in world is it? please help anyone? ?
#10 of 405 Re: chevy venture engine issues [lauraha]
Jun 08, 2009 (7:01 pm)
I'm from england,so unfortunately I am unable to comment on your rights regarding purchase, warranty etc. However I can tell you what happened to my chevvy. the inlet manifold gaskets are a known issue with these engines. mine blew so badly it leaked coolant into one of the cylinders whilst it was running and bent the connecting rod. This made the knocking noise that sounded like your description. I could not tell if it was a lifter or a rod till i took it apart. I removed the heads and turned over the engine by hand and noticed one of the pistons was not rising to the top of the cylinder. I had to remove the engine and replace said rod. Parts cost around $1000 canadian. I presume it is a private purchase, you might be able to appeal to their better nature and get some form of return if you ask, you never know.
If not you need a good mechanic, my engine has been fine ever since rebuild, i personally suggest repair rather than secondhand unit - better the devil you know. And it seems to be such a common fault you are likely to be purchasing more trouble. Good luck, hope this is somewhat helpful. I am tracking this thread, if I can be of further help or if you have more info dont hesitate to post
#11 of 405 Tap-Tap
Jul 10, 2009 (6:14 am)
I have a 2001 chevy venture and it taps once in awhile. I was told the oil pump is causing this . can anyone tell me how to replace this?
#12 of 405 head gasket
Jul 26, 2009 (3:57 pm)
recently started to get antifreeze in one of my ventures cylinders, the van never overheated, found antifreeze in the oil filter (a friend of mine told me the dexcool seperates from the oil so it doesnt get that chocolate milk appearance in the oil pan) Im not sure wether to repair the head gasket or just replace the motor....i hate to replace the gasket only to have the motor blow down the road due to antifreeze in the bearings.it has 125k miles on it and was well taken care of... Is there any way to flush the residual anifreeze out of the motor? any input or advice will GREATLY be appreciated thanks mike
#13 of 405 chevy venture specification's
Aug 28, 2009 (10:46 pm)
Hello. I live in the phillipines. I own a 2002 venture witha a 3.0 v-6 a/t f.w.d. i'm having a problem buying spare parts from the u.s.a, seems like it's a 3.4 liter v-6 motor over there, my question is did they ever produce the 3.0 v-6 over there and what vehicle did they use the motor on? and what automatic transmission and torque converter,do i have in my venture. on the bright side most other parts are compatible with the U.S version. will be overhauling the motor asap. thank you
#14 of 405 engine swap from the top
Aug 30, 2009 (11:33 am)
I read a thread online about someone who pulled a 3.4 out of a Venture through the top. I measured it without the exhaust manifolds and there's about an inch on each side. I can lift the engine this close to the edges, but I wonder which approach is best - fastest - safest. Has anyone done a swap this way? Any tips? Thanks
#15 of 405 Re: engine swap from the top [xtremeventures]
Sep 03, 2009 (6:48 pm)
I removed the engine from the top. The head gasket had blown, the antifreeze went into no 5 cyl and bent the rod. I removed the heads and pulled the motor easily without disturbing ac. It was major surgery, parts cost $1000 but the engine is sound now and better the devil you know. Also my engine was filled with antifreeze, it was in the exhaust, oil, bores - everwhere it shouldnt be. I changed the oil and filter twice, once to remove antifreeze, then after it had run for a few hours and hot. That was at 121k and am now at 175k no problems, I even have same oxy sensor. I did strip and clean the engine thoroughly before rebuilding.
#16 of 405 Re: chevy venture specification's [jebernabe]
Sep 04, 2009 (7:07 pm)
Hello...there was never a US spec Venture with a 3.0L V6 motor - they were all 3.4 L. There was an Oldsmobile version (previous generation minivan) with the 3.8L engine...and the previous version Lumina APV minivan had a 3.1L V6, but again, no 3.0
The only US spec 3.0 V6 that was built up to recently (there's a new 3.0 V6 but its not related) was a 3.0L that was used in the Buick Century and the Olds Ciera as well as a couple other models (Olds Cutlass Calais was another - Buick Somerset, Pontiac Grand AM) , not in any minivans - they stopped building that motor in the mid 80s...it was replaced by the 3.3L which was a bored out version of the 3.0.
The trans for the Venture was a 4T65E and in earlier versions (pre 2000), the 4T65 which still used a vacuum modulator - the "E" stands for electronic shift. Sounds like they might have done things differently for export to the Phillipines...