Running rich, failed smog
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Running rich, failed smog
Took my truck to get smogged today and it failed. Seems to be running too rich at 15 miles per hour in first gear and at 25 miles per hour in 2nd gear. I did kept this nipple that I seen uncapped cuz my truck is running really rough and that actually smoothing it out like it normally would run. Can I get any help on this?
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From: Virginia
If you are talking about the mixture screw on the carb no, it only adjusts the mixture at idle. If you have a on purpose vacuum leak(cap off) somewhere, the mixture screw probably won't do much at idle either.
Lead Driver
Joined: Jul 2009
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From: Sheffield, AL
Photo #1 reveals a vacuum leak. Look at the rubber cap on the vacuum tree on the intake manifold [near the O2 Sensor]. Check all rubber and plastic vacuum lines for additional cracks. While at it, check the two bolts which secure the carburetor to the EGR adapter. They tend to vibrate loose and create another vacuum leak. These engines run poorly when a vacuum leak exists.
Your engine is computer controlled [based on the O2 Sensor]. Our forum moderator, Chris Tubutis, gave me this link which shows how to get the computer to tell you what might be wrong. http://www.therangerstation.com/tech...ry/OBD_I.shtml
Your engine is computer controlled [based on the O2 Sensor]. Our forum moderator, Chris Tubutis, gave me this link which shows how to get the computer to tell you what might be wrong. http://www.therangerstation.com/tech...ry/OBD_I.shtml
Last edited by 1986F150six; Nov 2, 2016 at 03:04 PM. Reason: Added link.
Moderator
Joined: Jan 2001
Posts: 56,984
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From: Virginia
Photo #1 reveals a vacuum leak. Look at the rubber cap on the vacuum tree on the intake manifold [near the O2 Sensor]. Check all rubber and plastic vacuum lines for additional cracks. While at it, check the two bolts which secure the carburetor to the EGR adapter. They tend to vibrate loose and create another vacuum leak. These engines run poorly when a vacuum leak exists.
Your engine is computer controlled [based on the O2 Sensor]. Our forum moderator, Chris Tubutis, gave me this link which shows how to get the computer to tell you what might be wrong. Ford Ranger - Testing EEC-IV Equipped Engines
Your engine is computer controlled [based on the O2 Sensor]. Our forum moderator, Chris Tubutis, gave me this link which shows how to get the computer to tell you what might be wrong. Ford Ranger - Testing EEC-IV Equipped Engines
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Update. Just to pass smog. I loosened the carb mount bolts and Unplugged that cap I put on. It almost passed smog but the timing was too high now and I forgot to lower the idle speed so maybe that's why the timing was high. 1st pic is the first test.
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From: Virginia
You are letting it suck air everywhere to help the air to fuel ratio. You will never be able to idle it down by doing that. The carb is supposed to control the air entering the engine. It can't do that with all that air sucking in around the loose carb and the uncapped vacuum lines.
I know you are just trying to get it to pass, but I think you need to do some more troubleshooting.
I know you are just trying to get it to pass, but I think you need to do some more troubleshooting.
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Yeah, this situation sucks right now cause I broke both my hands and can't tear into this truck like I normally would. I need to be able to use the truck for doctors and what not. Maybe I will just have to take my time and do what I can do and do it right.
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