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Fuel too rich


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BillHillyBob
New User

Sep 20, 2018, 8:55 AM

Post #1 of 8 (1509 views)
  post locked   Fuel too rich  

I have a Dodge Dakota 2000 with a 3.9L fuel injection engine with automatic transmission.

I have installed a factory refurbished engine, had the transmission rebuilt. Have replaced all of the sensors, fuel pump, injectors, spark plugs, wire distributor, rotor, coil, alternator and AC compressor. The intire exhaust system has been replaced, cat, muffler and tail pipe. The CPU has been replaced and the was checked by the dealership that it had new updates.

The truck ran great for the first two months then began having trouble with fuel too rich. Received a code fuel bank one too rich. To start it you have put the peddle on the floor. No power on take off but you have to put the peddle on the floor to get it to go. Runs very rough and the smell of gas comes from the exhaust. Pops through the exhaust too.

I have taken this truck to serveral local mechanic shops to include the dodge dealership. They have conducted compression tests, vacuum tests, checked the spark and timing both are perfect as they put it. They all say that the truck should run great and they are at a loss.

Anything that is being missed? Help!


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 20, 2018, 7:26 PM

Post #2 of 8 (1497 views)
  post locked   Re: Fuel too rich  

This really isn't rocket science and any good tech should be able to diagnose this. The first thing i would do is monitor the fuel pressure and see what happens to the rest pressure when the engine is shut off.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



BillHillyBob
New User

Sep 20, 2018, 8:45 PM

Post #3 of 8 (1492 views)
  post locked   Re: Fuel too rich  

They already done that. They say the pressure is where it is supposed to be. Fuel pressure is good the compression is good and the have conducted a vacuum check on the engine block and through the vacuum lines.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 21, 2018, 2:53 AM

Post #4 of 8 (1489 views)
  post locked   Re: Fuel too rich  

I didn't ask if the fuel pressure was good. I said to check the rest pressure to see how quickly the pressure drops off when shut off.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



BillHillyBob
New User

Sep 21, 2018, 7:30 AM

Post #5 of 8 (1478 views)
  post locked   Re: Fuel too rich  

Ok. Didn't really understand what you were saying. I well that checked out


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 21, 2018, 8:07 PM

Post #6 of 8 (1466 views)
  post locked   Re: Fuel too rich  

And what were the results?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



jacob844
New User

Mar 13, 2019, 8:07 AM

Post #7 of 8 (427 views)
  post locked   Re: Fuel too rich  

I have an 1987 GMC V2500 5.7 Ltr TBI. Motor developed surging issue and had various form of advice and repairs made but never fixed the issue. Motor went and shop replaced it with a JEGs 5.7 setup, from new edelbrock intake, injectors, distributer, wire, plugs, coil etc, replaced throttle body, rebuilt TBI. When shop fire it up, surging was worse. They checked from fuel tanks forward, vacuum, charcoal canister etc. They could not fix it. A local shop promised they could fix it. After a month and new map sensor, smoking motor and other "technical stuff" they said it was running better as previous shop had timing off and some other items. He disconnected air pump as well. Came down for a checkout drive, till I got back to shop it was running poorly. He popped the hood and disconnected the new $117 dollar map sensor (cost $34) which made it run better but runs really rich. Drive it for awhile he said... when I took it back, "oh it's been too long and I don't remember your truck". I don't think he is will to honor his promise to fix my truck. That all being said, I did replaced a number of items with no difference. Temp sending unit, vacuum booster, vacuum lines, etc. Even put on two new fuel tanks, straps, fuel sending unit in tank and dash guage as well.

The exhaust burns your eyes and the dual exhaust puts out black carbon. My concern as I only have 2000- miles on the new motor that it will seriously mess up the motor at some point, let alone my catalytic converter. Plus my gas mileage is sooooo poor.

Any thoughts.....


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 13, 2019, 8:23 AM

Post #8 of 8 (425 views)
  post locked   Re: Fuel too rich  

This question belongs to someone else. If you would like some help please start a new question of your own.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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