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  #1  
Old July 29th, 2014, 03:08 PM
wesley0620
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Wesley Everett
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overfueling

Help, my 94 D90 overfuels so much that the oil gets gas in it. I have changed the pressure regulator and the thermistor. I can change the plugs and it will crank right up but in two days it is very hard to start and the plugs will be black and smell of gas in a few days the oil also gets higher on the dipstick
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  #2  
Old July 29th, 2014, 03:13 PM
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Originally Posted by wesley0620 View Post
Help, my 94 D90 overfuels so much that the oil gets gas in it. I have changed the pressure regulator and the thermistor. I can change the plugs and it will crank right up but in two days it is very hard to start and the plugs will be black and smell of gas in a few days the oil also gets higher on the dipstick
Sounds like it's in limp mode is it showing any codes?

Over fueling on all cylinders could be a function of a faulty coolant sensor.
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  #3  
Old July 29th, 2014, 03:15 PM
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I wouldn't drive it until corrected. It will wash the oil off the cylinder walls and accelerate ring wear.
Is it throwing any codes? Is it all cylinders, or just isolated ones?
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  #4  
Old July 29th, 2014, 03:24 PM
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been dealing with this, i am now attributing it to bad rings. compression test forthcoming, I am sure the engine needs replacing at this point.
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  #5  
Old July 29th, 2014, 03:36 PM
wesley0620
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Wesley Everett
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Have already replaced coolant sensor and no codes are showing

------ Follow up post added July 29th, 2014 01:38 PM ------

It is all cylinders all 8 plugs are solid black
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  #6  
Old July 29th, 2014, 03:51 PM
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Have you done a leakdown test on the injectors? Do you have the factory manual? It has a nice troubleshooting guide.
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  #7  
Old July 29th, 2014, 04:04 PM
wesley0620
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Wesley Everett
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I do have the factory manual but no I have not done a leakdown test, according to the manual the 14cux controls how long the injectors pulse it seems unlikely that all 8 injectors would be bad
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  #8  
Old July 29th, 2014, 04:16 PM
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I had this on my 1994 and it was that water had gotten into the computer (stupid location when fitted with AC on a 94 as vent seal leaks drip right down the harness wires into the computer) and caused intermittent shorting causing the injectors to squirt.

Other possibilities are leaking injectors, or some sensor on the engine causing the rich condition (can be a lot of them).

I second the question, any codes?
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  #9  
Old July 29th, 2014, 05:09 PM
wesley0620
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Wesley Everett
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No codes are showing

------ Follow up post added July 29th, 2014 03:12 PM ------

I have replace the coolant sensor can a MAF sensor cause this? I have cleaned idle air control also.
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  #10  
Old July 29th, 2014, 06:45 PM
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Quote:
Originally Posted by wesley0620 View Post
No codes are showing ------ Follow up post added July 29th, 2014 03:12 PM ------ I have replace the coolant sensor can a MAF sensor cause this? I have cleaned idle air control also.
Does the check engine light come on and then go off again when you first turn on the truck?

Did you check the big hose from the air filter to the MAF for holes?

You can drive around with the MAF unplugged to eliminate that as a possible cause. It will throw a code, but it works.

Does it have any miss or hesitation?

There are a bunch of things which could be the issue, you just need to hit them one at a time. This is why I have spares of everything around to swap out.
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  #11  
Old July 29th, 2014, 08:40 PM
wesley0620
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Wesley Everett
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Yes the check engine light does come on and go off when you turn on the truck will check the big hose and no it doesn't miss. I will unplug the MAF and see what happens.
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  #12  
Old July 30th, 2014, 12:00 PM
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If that does not work, I would take off the fuel rail and see if any of the injectors drip.
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  #13  
Old August 2nd, 2014, 09:38 AM
ajtbussen
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Bad gas. Drain and refill. Had same problem with my 97.
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  #14  
Old August 2nd, 2014, 10:55 AM
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Pull the plug off the ECU and see if it's full of moisture.
I'm struggling to understand how the injectors can be open constantly unless all 8 are live thanks to a short. Which is most likely at the ECu.
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Old August 2nd, 2014, 10:47 PM
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Read the 14cux test guide and then report back on the results.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #16  
Old August 12th, 2014, 08:52 AM
wesley0620
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Wesley Everett
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I pulled the MAF sensor connection and it still was flooding pulled plugs again and the new ones are all 8 black again I am down to the ECU just keeping the injectors grounded? Where is a good source to obtain one?
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  #17  
Old November 12th, 2014, 12:12 PM
wesley0620
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Wesley Everett
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Update on overfueling D90 it turned out to be the ECU couldn't afford new one (4100 dollars) ended up buyong used and fixed the problem
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  #18  
Old November 12th, 2014, 12:26 PM
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Steve Maietta
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An ECU is $4100 ??? Holy sh__.. Time for a megasquirt.
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  #19  
Old November 12th, 2014, 01:44 PM
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Quote:
Originally Posted by wesley0620 View Post
Update on overfueling D90 it turned out to be the ECU couldn't afford new one (4100 dollars) ended up buyong used and fixed the problem
Quote:
Originally Posted by evilfij View Post
I had this on my 1994 and it was that water had gotten into the computer (stupid location when fitted with AC on a 94 as vent seal leaks drip right down the harness wires into the computer) and caused intermittent shorting causing the injectors to squirt.
Sounds like Ron for the win.

$4100 for a 14CUX computer??

I'll sell a used one for half that...

.
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