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4 Wheel Drive/SUVs/1996 Chevy Tahoe missing

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Expert: - 5/12/2009


Question
96 Chevy Tahoe 5.7.  Misses at regular driving speed but mostly noticeable on inclines.  Also, only sometimes, when starting the vehicle runs very very rough.  One time it did smooth out after driving, the other times we have cut it off and restarted it and it has immediately run fine.  New parts: Fuel pump, fuel regulator, fuel spider, fuel filter, one can of seafoam and one bottle of injector cleaner, intake gasket, distributor cap and rotor button, plugs, wires, cleaned egr and maf.  Has new cat.converters.  When we got this truck the fuel spider was trashed and the intake gasket was blown out on one side, replaced them and the truck appeared to run pretty good but still had an annoying intermittant miss at driving speeds, sometimes it's very noticable and other times it's just enough to barely notice it's there.  I don't know where to start to fix this problem and could use some help if possible.  Vehicle idles at around 5-600 and new fuel pump is running
around 54lbs of pressure (which is the same as the old fuel pump.)

Answer
Wayne,

Run a compression test.  Could be bad rings or bad valves.  Also, run a system scan on the electronics.  May be a faulty sensor (anything from a crank position sensor, throttle position sensor, map sensor or the computer itself), or bad/plugged injectors.

Carl  

4 Wheel Drive/SUVs

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Carl Brandt

Expertise

Will discuss suspensions, lifts, lockers along with tire suggestions. Trail ratings and possible requirements needed for specific type of trails. Safety equipment and what you should carry with you. Certified off-road instructor. I am not a mechanic, and 4-Wheeling is a hobby, so if I can't answer a technical question it is due to my mechanical knowledge being related to vehicles that I have owned, or have worked on. I do not have manuals on all vehicles.

Experience

40 plus years of 4 wheeling in a variety of vehicles. At the present time, my major off-road rig is a 94 Jeep Wrangler with a spring over and a 1 1/2" suspension lift. This gives me a total lift of 7" or so. I have lockers front and rear. I have removed the track bars, and sway bar for maximum articulation. I am running a stock 2.5 ltr 4 cylinder with a Jacobs ignition along with a cold air high flow filter. It has 4.56:1 gears with a Dodge NV4500 transmission along with a 3.8:1 Atlas II transfer case. This gives me a final ratio of 105:1 in low gear/low range. Other vehicles I own, are a 96 Ford F-250 with a 6" lift, posi rear end, 36" Hummer tires, 5 speed with a fuel injected 460 ci engine, an 87 Samurai with an 8" lift, Ford 9" rear end with a spool, Chevy Dana 44 front end with an electric locker, 5.88 gears, 16% reduction in high range and a 6.5:1 low range with 35" Baja Claws, and a stock 2003 Grand Cherokee Overland. Trails I have run are the Rubicon (10 times), Dusey Ershim, Fordyce Creek trail, McGrew trail, several trails in Moab, Utah along with local monthly runs.

Organizations
Lost Coast 4x4's Cal 4-Wheel Corva UFWDA Blue Ribbon Coalition

Education/Credentials
Certified off-road instructor - Certificates in engineering/electronics

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