2000 gmc safari idling rough

2000 gmc safari idling rough

Postby mikee2174 [OP] » August 10th 2012, 6:40am

hello, my name is tiffany, ( im doing this from my other half) we are having problems with our 2000 gmc safari its a 4.3 liter vortec. over the last week its been idling rough, cutting out, almost dying on him a couple of times. he uses it for work and goes over 300 mile day in it. we have changed the idle air control vavle, the throttle postion sensor. we know it has a vacuum leak, but are haveing a hard time finding a diagram for it. we think its the one going to the fuel pressure regulator. can any give us hand in figuring it out please.
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mikee2174
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Re: 2000 gmc safari idling rough

Postby Sailing_Faith » August 10th 2012, 10:41pm

It sounds like it may well be the vacuum leak as you mention you suspect.

There are two places I have read these vans frequently develop leaks, the hose that connects to the air conditioner control, and the hose that leads to the accumulator (ball that holds vacuum).

Search for vacuum hose replacement, you will find a thread with pictures telling you what to look for.

Good luck!
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Re: 2000 gmc safari idling rough

Postby ccookie66 » August 10th 2012, 10:49pm

Here is a good way to test for vacuum leaks...take carb cleaner and spray along the vacuum lines. If the idle changes, mark the spot on the hose where it changed the idle. If there is a leak, it will suck in the carb cleaner and make the idle go up or down. But I would defiantly make sure you fix the vacuum leak before you take apart the upper intake plenum, its quite the job getting to the pressure regulator, when it could be a vacuum leak all along.

One more thing, is the van running rich at all?
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Re: 2000 gmc safari idling rough

Postby Sailing_Faith » August 10th 2012, 11:22pm

Three more points (I posted above);

Here is a thread with a diagram.

Also,

Using carb cleaner as recommended above is a good tool, but it can really break down rubber (like the vacuum hoses, and radiator hoses). I have stopped using it because of that. :cheers:

AND,

While looking for the post on the diagram to try to help you... I went and looked at my van and found two of my vacuum hoses were falling apart! Thanks to your question I found and changed mine, and probably fixed a minor annoying miss that I only noticed after long hwy running! :banana:

Having now put over 7000 miles on my van in the month I have had it I am still sorting through this myself. :driving:
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