Emission light?
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Postmaster
Joined: Jun 2007
Posts: 2,621
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From: Sweetwater Texas
Emission light?
What does the stupid emission light read off of? I have no cats and my egr is plugged, and the only time the emiss light comes on is when I turn my key on.
Elder User
Joined: Feb 2007
Posts: 601
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From: Chicagoland
Originally Posted by Dean88
Makes sense
I always thought that it was supposed to be telling me that something was wrong with emission systems.
I always thought that it was supposed to be telling me that something was wrong with emission systems.
Around here it is an automatic emissions test failure if your engine light doesn't prove-out.
Calvin
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
Originally Posted by mprice
Nope, that's just the truck letting check all the bulbs. It will send a signal to every light in the cluster when you first turn it on so you can see if any are dead. As long as it goes out after a few seconds you are fine.
Around here it is an automatic emissions test failure if your engine light doesn't prove-out.
Calvin
Around here it is an automatic emissions test failure if your engine light doesn't prove-out.
Calvin
Elder User
Joined: Feb 2007
Posts: 601
Likes: 1
From: Chicagoland
Originally Posted by subford
The CEL bulb is not in the start switch lamp prove-out circuit, it will only be turned on and off by the computer.
PCM Pin 17 -> DLC -> Dash - I know because I had to rewire mine before I could get it registered. Stupid PO thought twisting bare strands was a good way to make electrical connections.
Calvin
Lead Driver
Joined: Nov 2002
Posts: 9,555
Likes: 40
From: Concord, NC
The EMISS light is not the same as the check engine light. The EMISS light is turned on by a timer that is set to turn on the light around 70-80000 miles. There's a reset procedure in either a Haynes or Chilton manual, but since it doesn't tell you anything useful, you might as well just unplug the timer module under the dash. Basically it was Ford's idea to get you into the dealership to have them check over everything and throw them some money. In addition, the check engine light is not even wired to the engine computer on 87 model year trucks that I have seen (maybe even some early '88s as well).
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pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
Hi,
I'm new here but noticed Eric's 11/19/07 reply to this thread.
I couldn't find the reset procedure in Haynes but my light's been on for months....grrrr
I've got an '87 HD 250, 460 w/ 4v. NO sensors, cats or computers, AFAICT the only emissions devices I've got are the EGR and the air pumps.
Is this the "extended useful life sensor" I see in the schematic? What does this timer do, read engine hrs.? can anyone tell me how to reset it?
Thanks,
Jim
I'm new here but noticed Eric's 11/19/07 reply to this thread.
I couldn't find the reset procedure in Haynes but my light's been on for months....grrrr
I've got an '87 HD 250, 460 w/ 4v. NO sensors, cats or computers, AFAICT the only emissions devices I've got are the EGR and the air pumps.
Is this the "extended useful life sensor" I see in the schematic? What does this timer do, read engine hrs.? can anyone tell me how to reset it?
Thanks,
Jim
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Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Originally Posted by ArdWrknTrk
Hi,
I'm new here but noticed Eric's 11/19/07 reply to this thread.
I couldn't find the reset procedure in Haynes but my light's been on for months....grrrr
I've got an '87 HD 250, 460 w/ 4v. NO sensors, cats or computers, AFAICT the only emissions devices I've got are the EGR and the air pumps.
Is this the "extended useful life sensor" I see in the schematic? What does this timer do, read engine hrs.? can anyone tell me how to reset it?
Thanks,
Jim
I'm new here but noticed Eric's 11/19/07 reply to this thread.
I couldn't find the reset procedure in Haynes but my light's been on for months....grrrr
I've got an '87 HD 250, 460 w/ 4v. NO sensors, cats or computers, AFAICT the only emissions devices I've got are the EGR and the air pumps.
Is this the "extended useful life sensor" I see in the schematic? What does this timer do, read engine hrs.? can anyone tell me how to reset it?
Thanks,
Jim
Lead Driver
Joined: Nov 2002
Posts: 9,555
Likes: 40
From: Concord, NC
I found the reset procedure in my Haynes manual (didn't see a thing about in in Chilton's). I reset mine once, but have since just unplugged that module all together. I can't remember if it was called "extended useful life sensor" or something else. I'll try to remember to look through my Haynes manual next chance I get and post back to let you know.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
Hey Eric,
Thanks for your reply.
Which Haynes manual do you have?
Mine has a red & pink cover and says '80 thru '88 2&4 wd all full size F-100 thru F-350.
The index under "emissions" doesn't pan out.
Per Bill's reply I've just searched every one of your posts on this site -see above- Whew!
I suppose I could just take the bulb out there's not that much that could go wrong.
I'll look again, thanks.
Jim
Thanks for your reply.
Which Haynes manual do you have?
Mine has a red & pink cover and says '80 thru '88 2&4 wd all full size F-100 thru F-350.
The index under "emissions" doesn't pan out.
Per Bill's reply I've just searched every one of your posts on this site -see above- Whew!
I suppose I could just take the bulb out there's not that much that could go wrong.
I'll look again, thanks.
Jim
Lead Driver
Joined: Nov 2002
Posts: 9,555
Likes: 40
From: Concord, NC
I think the Haynes manual I have covers 87-96 F-series trucks. It's been so long since I used that section that I can't remember where it was located. I'll check when I'm at my parents' house this weekend and let you know what I find.