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check engine light at low rpms

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Old Aug 30, 2009 | 08:55 PM
  #1  
octaneforce's Avatar
octaneforce
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From: long island
check engine light at low rpms

when i am doing low rpms, such as doing about 30 in third gear, my check engine light will go on and sometimes the truck feels like it wants to stop. what could this be? i would have the codes checked but the check engine light turns off once i start moving faster. any ideas? -thanks

1992 f150 2wd 5spd i6
 
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Old Aug 31, 2009 | 07:18 AM
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subford
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From: Easton,Ks
The check engine light does not have to be on to check for codes in CM.
Also you can run the KOEO sensor test and the KOER solenoid test.
Go to:
http://fordfuelinjection.com/?p=13
for more information on running the tests.

Sounds like your EGR valve may be stuck open.
 
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Old Aug 31, 2009 | 10:17 AM
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octaneforce
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okay i will have to try checking the codes myself. is it possible that this can be caused by a partially clogged cat?
 
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Old Aug 31, 2009 | 11:04 AM
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From: Easton,Ks
I do not think so, a partially clogged cat would effect high RPMs not low.
Also I do not see how a partially clogged cat would turn on the check engine light.
 
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Old Sep 1, 2009 | 07:17 PM
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octaneforce
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okay. thanks!
 
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Old Sep 1, 2009 | 08:03 PM
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kennyrandolph
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From: monticello
my truck (93 f150 5.0L 5 speed) does the same thing. i not sure what the codes were but if i remember right its the egr valve that is not working right. dont quote me but i think thats your problem. hope this helps
 
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