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Old 07-23-2006, 19:00   #1 (permalink)
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Stalling and hesitating when cold

We have a 1994 Tempo, four cylinder, multi-port fuel injection, a standard transmission, and 201,000 miles. We have had it since new and have taken care of it. It has always started and ran well. Lately it takes quite a bit of cranking to start when cold, and will stall and hesitate when you give it the gas until it warms up. If it were carburated, I would say the choke wasn't coming on. Any ideas as to cause? The AutoZone counter man suggested the "cold-start injector," but I have a repair manual and it doesn't mention such a fifth injector. Is there something that is supposed to restrict airflow or add extra gas when cold? I have recently changed plugs, wires, distributor cap, fuel filter, and PCV valve. It runs better now, but the cold running condition hasn't improved.
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Old 07-26-2006, 19:27   #2 (permalink)
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Re: Stalling and hesitating when cold

The fuel pump in the tank may be losing it's prime (leakdown) causing the cold-start and cold run condition.

Try renting a fuel pressure tester from a parts store. Hookm it up and monitor fuel pressure while it's running. I f it drops while acting up, then it may be a bad pump.
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Old 10-09-2006, 15:47   #3 (permalink)
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Re: Stalling and hesitating when cold

There is an air temparture sensor located on the manifold. Some have it on the driver side, mine was located on the passenger side going into the #1 cyclinder air intake. The fuel mixture is affected by this sensor.
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