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4 Wheel Drive/SUVs/1989 isuzu trooper wont start

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Expert: - 1/14/2009


Question
I have replaced the fuel pump, fuel filter, Engine relay, all 4 fuel injectors, I finally rerouted the vacuum lines properly. I also disconnected the battery to Reboot the engine control module, (all suggested by friends and neighbors). She still won't start. What do I do now? Thank you very much.

Answer
Larry,

You've replaced a lot of parts.  Most of them will contribute to a rough running engine, but not necessarily stop it from starting.

The 2 items that will kill an engine is lack of fuel or no ignition (spark.)

Before replacing parts (a very expensive way to check out the problem,) you need to purchase a repair manual (usually $20) from a local auto parts store.  These manuals are great for trouble shooting.  

You can find out how to test many of these components before replacing them.  Check for proper fuel pressure.  May be nothing more than a plugged filter or fuel line.  Check for spark.  Could be a bad connection, wire, ground, distributor cap, coil, etc.

Go slow and read the manual.

Don't replace parts until they are checked out or tested.

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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