Jumping Idle Speed
Thread Starter
Instructor
Joined: Feb 1999
Posts: 139
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From: Peabody, MA
Jumping Idle Speed
My 94 LT1 has just developed an intermittant problem. The engine will be idling normally at 600-700 and all of a sudden it jumps to about 1200 RPM. About a second later, it returns to normal. This can be quite surprising when you're in gear at a set of lights and the car wants to jump ahead. Doesn't happen often, maybe more when the car is cold. Ideas??? Thanks in advance any any guidance.
Instructor
Joined: Jan 2003
Posts: 147
Likes: 0
From: Zephyrhills FL
Re: Jumping Idle Speed (Dan94)
Dan you will get more help in tech section on these kind's of questions. I have a 94 6-speed which had the same problem. I changed the TPS sensor, and the IAC sensor and found out that when the car gets hot under the hood the idle jumps around a little. Temp over 195+ in traffic and at stop lights. If I drive a long highway ride the idle stays perfect all the way there . I drove all the way to Nashville from Tampa area and it was OK. You said your vette does it when it is cold. I was told by my corvette friends it would get worst in time. So far they are wrong, been 2,500 miles later no worst. Hope this helps you a little. Good luck. George :chevy :auto:
