302 high idle surge
Senior User
Joined: Jan 2002
Posts: 185
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From: Central Florida, USA
302 high idle surge
What I think you are saying is that on your initial start the idle is at about 1500 RPM. After a short time it does not decrease, but instead may slightly increase. Is that correct? Some punctuation would help us understand the problem better.
If that is the case you probably have a leak in the intake such as the air plenum gasket, the Idle Air Control valve or other vacuum leak. This will cause a high idle RPM. Check all your vacuum lines to be sure they are firmly in place and are not cracked. Check around the intake manifold for a cracked or bad gasket. You can use carberator cleaner for this by squirting some where the manifold joins the block. Also check your Idle Air Control valve for proper operation and cleanliness. You should find that one or a combination of these is your high idle problem. The repair of each is not too hard either.
If that is the case you probably have a leak in the intake such as the air plenum gasket, the Idle Air Control valve or other vacuum leak. This will cause a high idle RPM. Check all your vacuum lines to be sure they are firmly in place and are not cracked. Check around the intake manifold for a cracked or bad gasket. You can use carberator cleaner for this by squirting some where the manifold joins the block. Also check your Idle Air Control valve for proper operation and cleanliness. You should find that one or a combination of these is your high idle problem. The repair of each is not too hard either.
Thread Starter
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New User
Joined: Aug 2002
Posts: 4
Likes: 0
From: Keizer usa
302 high idle surge
It seems that my temp gauge and my cruise control have stopped working at the same time as the idle issue developed. When I mention the idle goes from a normal high idle to a very high idle,I mean 2500 + rpm. I will try what you suggested. Thanks.
Thread Starter
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New User
Joined: Aug 2002
Posts: 4
Likes: 0
From: Keizer usa
302 high idle surge
Have not found any vaccum leaks. Have replaced the temp sensor and the idle control solenoid...discovered that when the idle control solenoid is disconnected it idles at 800 RPMs and when connected it takes off, off the tach scale I have (1500 plus). Ideas?
