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Old 02-26-2016, 02:25 PM   #1
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My first RV and need help 😅

I just bought a 94 ford Dolphin MH and it doesn't pass emissions because it's rich on gas what do I do th fix it
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Old 02-26-2016, 02:34 PM   #2
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Originally Posted by Nikitikitavi View Post
I just bought a 94 ford Dolphin MH and it doesn't pass emissions because it's rich on gas what do I do th fix it
Take it back to where you bought it , and have them fix it.
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Old 02-26-2016, 03:59 PM   #3
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If you didn't buy from a dealer (who should be on the hook for this issue if you did), you'll need to do some troubleshooting to determine why the engine is running rich/reading high HC emissions yourself or with the assistance of a qualified repair shop/dealer.

Generally speaking, some possible causes - in no particular order - include but may not be limited to:
  • Bad/fouled mass airflow sensor (MAF) and/or manifold absolute pressure sensor (MAP)
  • One or more bad fuel injectors not metering fuel properly
  • Worn spark plugs, plug wires, distributor cap, and/or rotor
  • Failing oxygen sensor(s)
  • Damaged/worn catalytic converter(s)
  • Clogged air filter (less of a candidate with fuel injection, but still)
Again, this is not an exhaustive list of possible causes. If the Check Engine lamp is on, reading the stored codes will likely point you in the general direction to start with. If not, you've got some detective work to do unfortunately.

Locating a service manual for your chassis will help in this regard. Helm Inc. has most factory service manuals available for purchase. For online diagnostic & repair information, I find Alldata DIY to be extremely valuable. Also, even though your coach is based on the Ford F-53 motorhome stripped chassis, a lot of F-550 truck information is relevant as well.

Good luck!
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Old 02-26-2016, 05:47 PM   #4
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Quote:
Originally Posted by Nikitikitavi View Post
I just bought a 94 ford Dolphin MH and it doesn't pass emissions because it's rich on gas what do I do th fix it
Get a scan done and go from there, you might just need a complete tune up, will also help with the mpg and performance as well..
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Old 02-26-2016, 05:56 PM   #5
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May have bad gas if it's been setting for a long time.
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Old 02-26-2016, 11:38 PM   #6
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Don't know what state you bought it in, but in CA it is the sellers responsibility for smog.
My 07 Winnebago faild it's last smog for the same reason. Turned out to be 2 cracked spark plugs. Last people to touch the engine was CW, when they installed my Banks Exhaust.
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Old 02-27-2016, 12:24 AM   #7
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Don't know what state you bought it in, but in CA it is the sellers responsibility for smog.
Correct, private or dealer the seller is responsible for any vehicle to pass smog test. If they don't want to repair it contact the California Bureau of Automotive Repair.

Bureau of Automotive Repair, State of California, Dept. of Consumer Affairs
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