VintageRacer
Dundas, Ontario
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Joined: 04/02/2005
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I had a bad case of water in the gas tank that caused similar symptoms.
Brian
2003 Dodge Ram 2500 Quad Cab, Hemi, 5 speed manual, 3.73 gears, Tow Beast hitch with 24" extension.
28 ft race car hauler, Lola T440 Formula Ford, NTM MK4 Sports Racer
2004 Travel Hawk 8' Truck Camper - Roll at 16K combined weight
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Chuck&Gail
In the Colorado Mountains
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Joined: 06/16/2004
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On our SUV, a bad fuel pump caused similar issues at about 100,000 miles, except only happened every 1000 miles or so. Replaced fuel pump, no more trouble in another 70,000 miles to date.
Chuck
Wonderful Wife
Lovely German Shepherd.
1999 Mercedes ML320 TV
2003 Wanderer 187TB Toybox (3620# UVW, 4800# loaded)
Not yet camped in Hawaii, 2 Canada Provinces, & 2 Territories.
I can't be lost because I don't care where this lovely road is going
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MegaCab_PL
Rockland County, NY
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Joined: 09/30/2005
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When I had my 99 Tahoe, I had same problems: replaced wires, plugs, dist cap, fuel pump, replaced injectors with the new style spider type from GM, catalytic converter and nothing helped. After I sold it I learned that 2 items i did not try is the distributor assembly and replace it with a better unit (not plastic stock one). On higher mileage vortec's the dist gear gets worn out and will cause a miss. The other theory I heard was that the valves get stock or not close properly, but that called for the head job.
I would get a good quality distributor assembly with new cap.
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Thunderbolt
North Branch, Mn USA
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Joined: 07/03/2003
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MegaCab_PL wrote:When I had my 99 Tahoe, I had same problems: replaced wires, plugs, dist cap, fuel pump, replaced injectors with the new style spider type from GM, catalytic converter and nothing helped. After I sold it I learned that 2 items i did not try is the distributor assembly and replace it with a better unit (not plastic stock one). On higher mileage vortec's the dist gear gets worn out and will cause a miss. The other theory I heard was that the valves get stock or not close properly, but that called for the head job.
I would get a good quality distributor assembly with new cap.
I forgot about the distributor which is also a common problem. It is usually the distributor bushings that wear and cause the miss, but the gears are known to wear as well. I would almost lean more toward this than the fuel pump because more often than not they will set a lean code as well as a mis-fire. I would still have a fuel pressure test done. It may be worth having it hooke to a scope to verify that it is an ignition miss before throwing more parts in. With everything else you have done it is highly likely it will be the pump or the distributor.
Bryan
2003 2500HD Ext. cab short box
6.0 liter 4.10 gears, Nelson performance PCM
98 K1500 4x4 heavy duty 1/2 ton
6,600lb GVWR 5,280lbs on the scale empty
14 bolt rear diff. 3:73 , Tranny and oil coolers
250,000 miles still purrin' like a kitten
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NateDiggity
Centralia, Wa
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Joined: 05/27/2004
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We had a similar problem, distro gear worn.... Fuel pump also went out, but when it did, it was consistent...
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Engineer9860
Eagle Scout dad
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Joined: 08/10/2003
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EGR valve or possibly an EGR valve control solenoid?
2002 Chevy 2500HD 4x4 8.1/ZF6sp RC/LB
2001 Chevy 2500HD 4x4 6.0/4L80E EC/SB
1997 Chevy Blazer 4x4
1994 Chevy K-2500 4x4 C6P 5.7/4L80E
1979 Chevy K-30 4x4 4sp 4.10
1977 Chevy K-30 4x4 4sp 4.10 454
30 year student of the Boeing B-17 Flying Fortress
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EJACKS
OAR RIDGE TENN.
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Joined: 05/21/2007
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Your problem may be related to one of two issues.First if you have had the distributer out you should have the ignition timming checked and it has to be checked and set with a scan tool that can read the cam timming advance it is not set with a light this will cause a randem missfire. Second thing is have the EGR valve checked it may be sticking when you first put engine under a load after being driven on as a daily driver for a while. EGR valves stuck open will cause a lean engine missfire and a rotten egg smell
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Thunderbolt
North Branch, Mn USA
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EJACKS wrote:Your problem may be related to one of two issues.First if you have had the distributer out you should have the ignition timming checked and it has to be checked and set with a scan tool that can read the cam timming advance it is not set with a light this will cause a randem missfire. Second thing is have the EGR valve checked it may be sticking when you first put engine under a load after being driven on as a daily driver for a while. EGR valves stuck open will cause a lean engine missfire and a rotten egg smell
If the cam retard is off it will set a different code than a misfire and it will set it shortly after the truck is started. I don't remember the code number though, but I think it is called a camshaft correlation error.
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Shamrock19
Norman, Ok.
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Joined: 07/29/2004
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Thanks for all the ideas folks. Fuel pressure tests good, new filter and of course the spider upgrade, so I'm thinking I've got the fuel system covered. I have not done anything with the distributor, thanks for the ideas there. I'll start with the cheapest item and work my way in.
One thing about it, the truck is paid for and only has 80,000 miles on it so I don't mind throwing a little money at it.
The Uptons:
Wifie and Me, and two daughters (born '95 & '98)
The Rig:
Tow Vehicle - 99 Tahoe
2006 Trail-Cruiser 23SB
Equal-i-zer hitch
Sometimes God calms the storm, and sometimes God lets the storm rage and calms his child.
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