Runaway Gun problem

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   Hi guys, newbie to this forum but hope to find some help.
I have a 98 Custom that's developed a peculiar problem, it'll "runaway" after I shoot sometimes on the first shot, sometimes after a shot or two. It's like it's not re-cocking all the way and it goes into "full auto" mode until it either starves for air, or you grab the cocking lever and manually stop it from firing.
I've replaced/tried different main springs, sear springs, even re-oringed the valve, and removed my double trigger and put the stock trigger back on all with the same result.
Is it a problem with my valve that (re) o-ringing it didn't cure? Is it something I'm missing?
The only irregularity I've noticed is my drive pin (operating rod) is very very slightly bent. Barely even enough to notice. It's not cause a visible bind in the main spring or and "roughness" in operation.
Any help/suggestions are greatly appreciated. I already ordered all new internals from Tippmann this morning and they're on the way, but I was hoping someone could pin-point the problem for me...I'm stumped.

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Spike44 Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 17 January 2005 Location: United States Status: Offline Points: 4	Post Options Post Reply Quote Spike44 Report Post Thanks(0) Quote Reply Topic: Runaway Gun problem Posted: 17 January 2005 at 9:00am
	Hi guys, newbie to this forum but hope to find some help. I have a 98 Custom that's developed a peculiar problem, it'll "runaway" after I shoot sometimes on the first shot, sometimes after a shot or two. It's like it's not re-cocking all the way and it goes into "full auto" mode until it either starves for air, or you grab the cocking lever and manually stop it from firing. I've replaced/tried different main springs, sear springs, even re-oringed the valve, and removed my double trigger and put the stock trigger back on all with the same result. Is it a problem with my valve that (re) o-ringing it didn't cure? Is it something I'm missing? The only irregularity I've noticed is my drive pin (operating rod) is very very slightly bent. Barely even enough to notice. It's not cause a visible bind in the main spring or and "roughness" in operation. Any help/suggestions are greatly appreciated. I already ordered all new internals from Tippmann this morning and they're on the way, but I was hoping someone could pin-point the problem for me...I'm stumped.

rmorey Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Made it by a Hair Joined: 18 November 2003 Location: United States Status: Offline Points: 1002	Post Options Post Reply Quote rmorey Report Post Thanks(0) Quote Reply Posted: 17 January 2005 at 9:15am
	Check your sear. If it's worn too much it just won't catch the rear bolt properly (or consistently). Other than that, you've pretty much done everything you can. Your last resort is to let Tippmann take care of it. Send it in to them and they'll usually fix it for free (less the cost of parts).
	You are never beaten until you admit it. - G. Patton

Spike44 Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 17 January 2005 Location: United States Status: Offline Points: 4	Post Options Post Reply Quote Spike44 Report Post Thanks(0) Quote Reply Posted: 17 January 2005 at 9:23am
	Thanks for the encouragment. It's very frustrating when you think you know what you're doing but still can't find/diagnose the problem. I have replaced the sear recently, and the leading edge looks nice and crisp. I'm hoping the new valve and other parts will cure it...but I'm still curious as to why it's doing this..

LordJovian Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 01 June 2004 Location: United States Status: Offline Points: 1882	Post Options Post Reply Quote LordJovian Report Post Thanks(0) Quote Reply Posted: 17 January 2005 at 2:31pm
	Have you oiled the valve? Could be the valve pin isn't opening all the way to allow air to push the rear bolt back enough. Might also be blockage in air supply lines. More than likely it is the CVX. After you get your replacement, take apart the old CVX and see what the problem was.
	A-5 E-grip Chipley Custom Carbon Graphite 16" Evil Adapter(Spyder) 32 Deg New '03 XChamber Remote Line Gun Sling Sniper f/x Stock LPK 68/4500 HPA R-5 CP Reg JCS Duel Trigger

bravecoward Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group oxymoran Joined: 21 May 2004 Location: United States Status: Offline Points: 61659	Post Options Post Reply Quote bravecoward Report Post Thanks(0) Quote Reply Posted: 17 January 2005 at 5:45pm
	low on co2? lol


Shadowminion Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Strike 1 - Language, 3/20 Joined: 06 June 2004 Location: United States Status: Offline Points: 1625	Post Options Post Reply Quote Shadowminion Report Post Thanks(0) Quote Reply Posted: 17 January 2005 at 8:44pm
	Or possibly Cold CO2 , Tis the season and all
	SL68-II , micro honed and polished .688" bore . Tuff Enuf . Widowmaker , under construction

Spike44 Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 17 January 2005 Location: United States Status: Offline Points: 4	Post Options Post Reply Quote Spike44 Report Post Thanks(0) Quote Reply Posted: 18 January 2005 at 10:52am
	I don't use CO2, I use HPA..and have tried several tanks of various fill..it's not a "supply" problem. LordJovian, I agree, I'm hopeful/optomistic that the new valve will hook me up. It's gotta be something I've over-looked inside the valve.

eaglesin05 Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 08 December 2004 Location: United States Status: Offline Points: 666	Post Options Post Reply Quote eaglesin05 Report Post Thanks(0) Quote Reply Posted: 18 January 2005 at 8:42pm
	I had an expansion chamber with a vert adapter and a remote line and my gun was doing that to me at my friends house. I field stripped the eintire thing and tok out the vert adapter and expansion chamber. I know its not the same problem but it was doing the same thing
	Camo'd 98C Remote Polished internals Dbl trigger 14" J&J Ceramic Barrel Rocket Cock 2 Trigger Slop Mod 12V Revvy 03' Dye stikies R/T Drop Forward

footballz31 Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 17 January 2005 Location: United States Status: Offline Points: 26	Post Options Post Reply Quote footballz31 Report Post Thanks(0) Quote Reply Posted: 18 January 2005 at 9:36pm
	Sell it on ebay and get a new tippy
	Tippmann 98 Custum Smartparts Progressive 14" barrel

Mack Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Has no impulse! control Joined: 13 January 2004 Location: 2nd Circle Status: Offline Points: 9906	Post Options Post Reply Quote Mack Report Post Thanks(0) Quote Reply Posted: 20 January 2005 at 2:07pm
	Could be a blockage in you air line from the ASA to the valve. You'd need another airline to test this theory. I would discount it if you are still getting good velocity.


clownshooter Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Checking your underwear drawer Joined: 15 June 2002 Location: United States Status: Offline Points: 3371	Post Options Post Reply Quote clownshooter Report Post Thanks(0) Quote Reply Posted: 20 January 2005 at 9:24pm
	If it is not the sear, it could be the cup seal in the valve. My Pro-Carbine did the same thing, only it was off and on. I replaced the valve and the problem vanished.

iceman1186 Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Joined: 09 October 2002 Location: United States Status: Offline Points: 1036	Post Options Post Reply Quote iceman1186 Report Post Thanks(0) Quote Reply Posted: 22 January 2005 at 9:33pm
	Well, if you havent already make sure that the valve bolts on the side of the gun are tight.


mod98commando Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: 10 June 2002 Location: United States Status: Offline Points: 4432	Post Options Post Reply Quote mod98commando Report Post Thanks(0) Quote Reply Posted: 23 January 2005 at 10:33pm
	You may also want to check the o-ring on the rear bolt. This o-ring has to be in good condition for the valve to be able to blast the rear bolt back enough for the sear to catch it. If it's broken or damaged and isn't making a good seal with the valve then it could definitely cause your problem.
	oreomann33: Everybody invades Poland Rofl_Mao: And everyone eats turkey Me: But only if they're hungary Mack: Yeah but hungary people go russian through their food and end up with greece on everyth

twistedkev1990 Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 19 June 2004 Location: United States Status: Offline Points: 237	Post Options Post Reply Quote twistedkev1990 Report Post Thanks(0) Quote Reply Posted: 28 January 2005 at 8:49pm
	I had the same problem. It was a combination of a cracked slightly cracked powetube and a bad sear. You might want to look real close at you powertube and look for a crack.