Last post on Jun 25, 2012 at 4:42 AM
You are in the Chevy Venture
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Chevrolet Venture, Auto Repair, Van
#8 of 145 2000 Venture rough Idle
Dec 10, 2007 (7:51 am)
When i turn my HVAC fan switch on I hear a loud ticking coming from the engine and it starts to run rough. When I turn the fan off the rough idle disappears. Also the #5 setting on my fan switch only works sometimes and the backlighting flickers. Any solutions?
#9 of 145 Re: 2000 Venture rough Idle [gregearn]
Dec 10, 2007 (10:25 am)
Are you running your AC when you hear the ticking? Could the loud ticking be your compressor going bad? You could check by putting your hand on it and seeing if you feel vibrations at the same rate as the click... I've also heard a similar sound when the belt tensioner goes bad and doesn't keep enough tension on the belt so when you put additional load on it by turning on the AC, it flops around and makes a clicking or thumping sound. Look at it while its running and see if its slapping around. Rough idle could also be Idle Air control valve (IAC) going bad (it controls your idle speed) or a host of other things...hard to diagnose without some more info
As for the #5 fan setting - I think its a separate issue - blower resistor going bad perhaps - cheap part about $ 20, its located behind the blower on the passenger side front. Easy repair, very common failure on the Venture. The flickering seems to be common on the Venture and usually is cured by a new alternator - it probably flickers more because the fan running on high speed is a pretty big electrical draw.
Just some things to check right off the bat - post more details and hopefully I can help you further.
#10 of 145 Re: 2000 Venture rough Idle [442dude]
Dec 10, 2007 (11:08 am)
Actually my AC is already shot. We just don't turn it on.Compressor clicking when we turn the ac button on. I have not decided if I want to spend that much money yet. The sound I am hearing when I turn the fan on is coming from the engine itself. Is there a vacuum line connected to the HVAC that could be causing this?
#11 of 145 Re: 2000 Venture rough Idle [gregearn]
Dec 10, 2007 (11:38 am)
Only vacuum line that I know of is the one that moves the vents when you change the selector, not the fan speed switch. It goes through the firewall by the passenger foot well in the front and IIRC swings around by the windshield washer reservoir, goes over the belts and plugs into a port on the top left side of the motor. Do your vents change position with the selector?
Are you sure the click isn't coming from the compressor? On some cars, the compressor kicks on when the selector is in the defrost setting, not sure if this is the case in the Venture, if so, then there's an electrical connector on the compressor that you could unplug...will have to check on the wife's (2000 as well) when I get home, maybe that's the click or does it not matter which position the vents are in? Is it the same click? Let me know...I'll have to admit that you may have me stumped....I've never known an alternator to make a click...usually a grinding or metal on metal scraping sound...I just can't think of anything that would click in an engine when you turn on the fan. With the hood up can you get a general idea of the direction of the click?
#12 of 145 Re: 2000 Venture rough Idle [442dude]
Dec 10, 2007 (2:28 pm)
Its my wifes van and she isn't home yet. I'll check when she gets home. I have a stethoscope. I'll try that and see if I can narrow down where it comes from.
#13 of 145 Tapping when starting
Jan 06, 2008 (3:12 pm)
2003 Chevy Venture 3.4 liter
There is a loud knocking when first started that lightens after running for awhile but is still there. The oil is fine, no lights come on, seems to run fine. Any ideas anyone? Never had a moments problem with this van in the four years we've had it. Only has 97xxx miles and has had the oil changed religously.
#14 of 145 Re: Tapping when starting [cujo57]
Jan 07, 2008 (6:17 am)
Tapping & knocking are typically 2 different things - tapping from the top of the motor, knocking from the bottom, but I think I know what you're talking about.
Does it eventually go away?? All of the 3.4 V6 in the Ventures make a metallic tapping sound when they first start which goes away in a few minutes. Its nothing to worry about, the lifters in these motors are pretty noisy at startup. I think if you keep up the maintenance the way you've been doing you should have no problems.
#15 of 145 97 venture van stalling
Jan 31, 2008 (10:44 am)
I recently started having problems with my van stalling and also running rough..chugging..usually between 60-80kph.The problem only happens when the van is warmed up.I had it to my mechanic who checked the fuel pump..which was fine..changed the fuel filter and also put the van on a diagnostic tester.Even when the van was chugging and stalling no codes came up on the tester.Both him and I are at a loss.I thought firts maybe bad gas..water in the gas..but i put in methyl hydrtae and hi-test gas and the problem coninues...any idea?
#16 of 145 Re: 97 venture van stalling [chewson]
Jan 31, 2008 (12:48 pm)
sounds like a fuel or ignition problem to me -
get a digital multimeter, check the resistance on the ignition modules (located in back on top) between the two towers on each (towers meaning where the spark plug wires connect to) the resistance should be 5000-7000 ohms - if its above or below, you've got a bad ignition coil...and make sure the posts are clean
Run a bottle of fuel injector cleaner through it (Techron recommended)
Get a can of MAF sensor cleaner and follow the instructions.
Just a couple of things I would try right off the bat...
No codes at all? No check engine light? Interesting...
#17 of 145 Re: 97 venture van stalling [442dude]
Jan 31, 2008 (1:27 pm)
I did put some fuel injector cleaner in..but still no luck.I actually thought today the problem was going away..but that was only because it is freezing out because as soon as the van warmed up..same problems.I read somewhere else about a possible bad ground or short from the gas tank...i did just put a new muffler on the van 2 weeks ago..and it was running great before that.