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4 Wheel Drive/SUVs/1991 Ford explorer 4X4 4.0

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Expert: - 8/26/2011


Question
Hello Carl -

Would you know this vehicle, when warmed up, I park it for about 5 minutes  and when I try to re-start it will not start. If I wait about 30 minutes, it will start right up. Any ideas?

Thank you and
Aloha
Calvin

Answer
Calvin,

This could be one of several things, ranging from a bad coil to a simple tune up.  I would do a full tune up first if it hasn't been done lately.  A weak starter or faulty fuel pump can also cause this.  Another thing, could be any of several sensors that are heating up when running, and cool down after the 30 minutes.
Other questions would be:
Does it overheat when running,
Does the engine surge,
Is the throttle response slow,
When it does start, how does it idle,
Do you have to give it gas to start it?

These are all questions that could give you an indication of which part might be faulty.

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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