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Jim Grant's Tech Tips
'94 Jeep Wrangler, Stalling Problems
Q:
I have
a ‘94 Jeep Wrangler 4.0L with an automatic transmission. At cold
start up it revs to fast idle then as it comes down to regular idle it
stalls out. Restarting it may or may not stall again. When it reaches
operating temperature, it runs fine. The plugs, ignition wires, rotor
and distributor cap were replaced at 2k-2.5k miles before stalling started
and they still look good. Fuel pump pressure is normal. This vehicle has
143k mile on it and has given excellent service.
A:
Take
the air inlet hose off where it enters the throttle body and take a look
at the throttle plates. It is likely that they’re dirty and have
a build-up of carbon deposits. That is the most common cause for stalling
that we see in the shop for your vehicle. Sometimes all it takes is a
good cleaning to cure the stalling problem. There is an idle speed setting
on your Jeep, but to check and/or perform this service step requires the
use of a computer scan tool for your vehicle. If the cleaning doesn’t
help ask a repair facility to check and reset, if needed, the minimum
idle speed on your Jeep.
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