idle
Thread Starter
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Mountain Pass
Joined: Jan 2001
Posts: 130
Likes: 0
From: Ozark Arkansas
idle
i have an 88 f150 4x4 with a 302. sometimes it will idle at like 3000 rpms it doesnt do it all the time sometimes its fine others its not i have replaced the iac. cleaned everything. the only way to get it to idle down is to stomp it to the floor and let off. there isnt anything sticking the only codes i get are egr b/c its unhooked. ive messed with it for about a month cant find any vaccuum leaks anywhere. im stumped
Senior User
Joined: May 2003
Posts: 203
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From: San Diego
idle
Are you absoulutely positively positive your throttle valve isn't sticking slightly open?
Have you checked your throttle position sensor lately? If you read the signal line from it when your at high rpm and no throttle, it should be .9 to 1.0 volts. Be CAREFUL when you read it, don't short anything out. Also check the reference voltage at the sensor, should be 5.0 to 5.1 volts.
What is the idle when it's "normal", 800? higher?
Regards, Robert.
Have you checked your throttle position sensor lately? If you read the signal line from it when your at high rpm and no throttle, it should be .9 to 1.0 volts. Be CAREFUL when you read it, don't short anything out. Also check the reference voltage at the sensor, should be 5.0 to 5.1 volts.
What is the idle when it's "normal", 800? higher?
Regards, Robert.
Senior User
Joined: May 2003
Posts: 203
Likes: 0
From: San Diego
idle
Note also that with the egr disconnected (I'm assuming the vacuum line is pulled off), the ecm will go into fault mode, using preset values, which will make the truck run like crap.
Is your check engine lite on?
Regards, Robert.
Is your check engine lite on?
Regards, Robert.
Thread Starter
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Mountain Pass
Joined: Jan 2001
Posts: 130
Likes: 0
From: Ozark Arkansas
idle
i am pretty that nothing is sticking ive try tryed to close the throttle under the hood when it does it it wont move. when it idles right its at about 700. when its doing it i can turn the key off goin down the road and it runs fine when i turn it back on. it runs the same way with it hooked up
Last edited by fordzrule; Jun 30, 2003 at 09:49 PM.
Thread Starter
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Mountain Pass
Joined: Jan 2001
Posts: 130
Likes: 0
From: Ozark Arkansas
idle
i replaced the tps today still did the same thing. pulled the hoses off and stuck my hands over the throttle body to make sure there wasnt a big vaccuum leak it died when i plugged them so that pretty much rules that out. I also put on a new throttle cable. still the same. pulled the codes again now its running lean
Senior User
Joined: May 2003
Posts: 203
Likes: 0
From: San Diego
idle
Did you run a KOER test, and if so, was the engine idle high when you ran the test? For meaningful results the engine would have to be experiencing the problem when the test was run.
If so, what were the codes?
Regards, Robert.
If so, what were the codes?
Regards, Robert.
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