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Van cutting out while driving #738720
July 26th 2018 2:36 pm
July 26th 2018 2:36 pm
Joined: Sep 2017
Posts: 30
Oklahoma
abcde06991 Offline OP
newbie
abcde06991  Offline OP
newbie
Joined: Sep 2017
Posts: 30
Oklahoma
I have a 95 G20 with a 350. I've had a problem with the motor ever since I got this van. It's pretty minor so I figured I'd just get around to it later. What happens is when I'm driving, it usually happens downhill, and I let up off the gas it starts to stutter/cut-out/surge or whatever, I don't know what to call it. You can feel the van slightly going back in forth when it happens, and it's almost as if its trying to die while I'm driving. Sometimes it'll do it a bunch, sometimes it won't at all, and it happens so little I figure it's not a big deal. Used to happen a lot more when i first got the van, but now that I've replaced pretty much everything on top of the motor and tuned it up, it has ran better. Replaced coil, timing cap and rotor, spark plug wires, rebuilt the throttle body, and other misc. stuff. I figured that'd solve it but it persists. Also just sitting in the driveway, giving it a bit of gas, it starts to surge, rpms go up down up down.

Any help with this would be appreciated, thanks.


95 GMC 3/4 Vandura Traveler by Explorer Conversion
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Re: Van cutting out while driving [Re: abcde06991] #738726
July 26th 2018 3:57 pm
July 26th 2018 3:57 pm
Joined: Sep 2005
Posts: 8,608
Georgia, USA
CatFish Offline
carpal tunnel
CatFish  Offline
carpal tunnel
Joined: Sep 2005
Posts: 8,608
Georgia, USA
Pull your codes?
I'd look to see if there are any codes in memory first.
I assume you've changed the fuel filter, PCV valve and checked the ignition timing.


"Have you ever noticed that insisting that something is wrong is not nearly as powerful as suggesting that something is wrong?”
Re: Van cutting out while driving [Re: CatFish] #738730
July 26th 2018 4:34 pm
July 26th 2018 4:34 pm
Joined: Sep 2017
Posts: 30
Oklahoma
abcde06991 Offline OP
newbie
abcde06991  Offline OP
newbie
Joined: Sep 2017
Posts: 30
Oklahoma
Fuel filter and the fuel pump were changed also, and the timing was checked. The PCV valve I haven't changed, that could be the issue?


95 GMC 3/4 Vandura Traveler by Explorer Conversion
[Linked Image]
Re: Van cutting out while driving [Re: abcde06991] #738731
July 26th 2018 5:11 pm
July 26th 2018 5:11 pm
Joined: Aug 2001
Posts: 11,783
Fircrest, WA
Reed Offline
Maniac
Reed  Offline
Maniac
Joined: Aug 2001
Posts: 11,783
Fircrest, WA
Is the fuel pump internal on the fuel tank? If not, could be a partially clogged fuel pickup.


Windows- they're what make a van worth owning!
Re: Van cutting out while driving [Re: Reed] #738733
July 26th 2018 5:57 pm
July 26th 2018 5:57 pm
Joined: Sep 2017
Posts: 30
Oklahoma
abcde06991 Offline OP
newbie
abcde06991  Offline OP
newbie
Joined: Sep 2017
Posts: 30
Oklahoma
It's internal


95 GMC 3/4 Vandura Traveler by Explorer Conversion
[Linked Image]
Re: Van cutting out while driving [Re: abcde06991] #738736
July 26th 2018 11:41 pm
July 26th 2018 11:41 pm
Joined: Jul 2014
Posts: 1,311
Texas, under the A/C
Rusty_Pancelode Offline
Rust N Dents
Rusty_Pancelode  Offline
Rust N Dents
Joined: Jul 2014
Posts: 1,311
Texas, under the A/C
Look at the injector spray pattern while it's idling. If it looks like the fuel is dripping instead of spraying the injectors are clogged.
Probably wouldn't hurt to run some cleaner through them anyway.
That's the first thing I do when I get a surging idle.

Another thing to consider is the EGR valve. Sometimes it can give you symptoms that seem fuel related.


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