1995 OBD-I question
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1995 OBD-I question
I have a 1995 f-150, and a check engine light that only comes on when driving and stays on until the key is shut off.My question is, is it possible and safe to install the jumper for the self-test while the engine is running. I've already tried auto-zone and their scanner can't tell me anything while it's running.Don't really want to take it to a Ford dealer and have to pay a diagnosis fee. Any help will be greatly appreciated. Thanks in advance.
Lead Driver
Joined: Nov 2002
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From: Concord, NC
As far as I know, the computer will only start its self test mode from a key-off position. Don't worry, though, the code that is turning on the check engine light should be stored in the computer's memory even after you shut off the engine. It makes no difference that the light does not come back on immediately at start-up. Another site to help you pull codes: EEC IV Self Test hookup just leave out the volt meter/test light and watch the check engine light or the blinks.
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Yeah, auto-zone tried both, KOEO showed nothing, and the tester ewouldn't work with the engine running. I have noticed hesitation and bogging when accellerating, especially half throttle to WOT. Fuel economy has dropping and occassionally the transmission shifts hard into gears, usually when the throttle is half to wide open.
Thanks for the site, will have to give it a try. Did not see any KOER procedure... I did have the codes pulled 4-5 monthes ago, this has been an ongoing intermittent problem.. Has started happening more lately, and seems to be getting worse. I don't remember the exact codes, but I believe they had to do with egr flow and low voltage..
Keep in mind I don't drive this truck very much, only around 2000-3000 miles a year.
Thanks for the site, will have to give it a try. Did not see any KOER procedure... I did have the codes pulled 4-5 monthes ago, this has been an ongoing intermittent problem.. Has started happening more lately, and seems to be getting worse. I don't remember the exact codes, but I believe they had to do with egr flow and low voltage..
Keep in mind I don't drive this truck very much, only around 2000-3000 miles a year.
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From: Lafayette, IN
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Ok, followed the steps for the KOEO test, pulled 2 codes. 111 and 332. Looked them up already, and found "system pass" and "egr valve opening not detected". I just replaced the egr position sensor 4 days ago. My truck is a 4.9L auto if that helps.. Any ideas?
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Joined: Jun 2006
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From: Ottawa, Ontario
I'd bet you have a broken vacuum line since you also have a bogging problem. Look at the lines that feed the EGR sensor and the EGR vacuum regulator(EVR).
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