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Old 12-02-2013, 11:30 PM   #11
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a leaking injector would be able to burn all the fuel at high idle but fail to do so at low idle. H2O is always produced as a bi-product of combustion.

i.e CH3 + O2 = H2O + CO2
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Old 12-02-2013, 11:38 PM   #12
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Quote:
Originally Posted by JohnnyRingo View Post
a leaking injector would be able to burn all the fuel at high idle but fail to do so at low idle. H2O is always produced as a bi-product of combustion.

i.e CH3 + O2 = H2O + CO2
Leaking injector is suppose to throw an injector malfuction code. I did a drip test per the manual. They don't seem to be dripping.

I'm sure if I could trick the engine into close loop operation at idle it would be fine. No idea why they have this thing completly ignore the o2 sensor at idle.
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Old 12-03-2013, 12:03 AM   #13
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Well that got me thinking. I replaced the fuel pump, and the one I got didn't have a dampener on it or a way to attach my old dampener, so I omited it. To high of pressure would make the injectors spray more per pulse.

I've not tested the fuel pressure yet it should be at 36psi.

The injection has a regulator on the injection unit. With this dampener missing would it really reduce PSI? Because it seems to only function as a flow velocity dampener to create back pressure for the pump itself.

Could I just put an after market regulator inline rather that getting a proper fuel pump with dampener?

I do have a regulator but it's pressure starts at 40 PSI... if I used it the pressure would be off by 4 PSI... would that translate into over 10% more fuel going through the injector?
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Old 12-03-2013, 06:27 AM   #14
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the 3.0 does have a hot wire air flow meter. it is on the drivers side of the throttle body. some are 3 wire and some are 4 wire sensors. http://www.japanesetruckdismantling..../afh45m-14.htm

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Old 12-03-2013, 11:59 AM   #15
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How do you guys understand all this SMOG stuff?

On the Sea Foam, what I have heard is you run one can in the engine oil and one can in the fuel tank, but I have never tried pouring a can of that in my engine crankcase before.

Sounds like you've done your homework. I'd only be suspicious of that custom MAF unit you have installed. It could be tricking the ECU into thinking you are running in some state that it is trying to correct.

I don't know, really.
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Old 12-03-2013, 10:22 PM   #16
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Yes it does have an air flow meter of sorts like the one cadillacdude1975 posted pic of. It's not like a typical one you would find just before a throttle body of most injection systems, this one is part of the throttle body. Anyways if it was in "failure" it would throw an ECC code. Anyone know of specific tests to do on it? Usually when these go bad, the engine doesn't do much at any RPM.

Oh about the fuel pressure, tested it and it's right at 36psi

IDK at this point I'm ready to paint the damn truck a different color to see if it helps. =P
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Old 12-03-2013, 10:28 PM   #17
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Old 12-03-2013, 10:29 PM   #18
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Old 12-04-2013, 01:10 AM   #19
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Well all checked out ok with exception of pulling the Air Flow Meter. What I found was old old old gas, so evaporated it had the consistency of oil, but no mistaking the old gas smell.

It was getting dark so I just put it back on for now.

In my 89 manual in event of wet air flow meter, you should check for dripping injectors. My injectors don't drip =\

Anyone have detailed knowledge or pictures of the Air Flow Meter ducts on the throttle body? Seems to me something is plugged to allow this fuel to not evaporate into nothing.
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Old 12-04-2013, 05:12 PM   #20
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I cleaned out the Air Flow Meter ducts and hot wires with some starter spray then shot with compressed air to dry them out.

Seems the ducts have a small area where gas can pool over time and cover one of the hot wires.

Retested all the Air Flow Meter diagnostics, 1.2v at idle, 1.2v-4.8v when throttling.

Pulled the Air Flow Meter after running at idle for 30min and was dry. Hope this was it. Though I noticed no change in idle or odor from the tail pipe after the cleaning.

Guess I will go have them put it on the machine again and see what the HC's are at.

Rechecked gap, timing, idle speeds. 41, 12, 800 so we'll see.
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