Drinking gas like an alky - JeepForum.com
 
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post #1 of 8 Old 10-18-2021, 11:23 PM Thread Starter
x4rattler
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2000 WJ 
 
Join Date: Oct 2016
Posts: 12
Drinking gas like an alky

I will down load some scanner pics and see if someone can
figure out this mess before I have to take it to a mech.
New copper plugs
New TPS
New upstream NGK- downstream isn't that old
One injector code
One coil code
Idles very bad, does't die
Runs great good response
50 miles to a quarter tank is wayyyy to much
Hauls a___ down the freeway
I have pulled coil plugs and injector plugs off one by one
Left bank doesn't seem to make much difference at idle coil or inj.
Right bank does make a difference at idle coil or inj.
This 4.7L really drinks its share.

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post #2 of 8 Old 10-18-2021, 11:28 PM Thread Starter
x4rattler
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Just changed oil last month but now it smells a little gassed.
changed water temp sensor also because it had a code.
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post #3 of 8 Old 10-19-2021, 04:01 AM
jtec
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post ALL the code numbers displayed on your scanner.

advise us If there is a schraider valve on the fuel rail, it will make fuel pressure check and leak down check easy.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #4 of 8 Old 10-19-2021, 04:43 AM
Delta0
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Yeah, there's juicy.

Have you cleaned the throttle body and it's sensors yet?
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post #5 of 8 Old 10-19-2021, 07:43 AM
HarryH3
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First thing I'd be doing is trying to find out why the Short Term Fuel Trim on Bank 2 is 99.2% (Last line in your last pic) That means that the computer is basically commanding the injectors on that bank to deliver twice as much fuel as normal. Is the idle way higher than normal? That would indicate a massive vacuum leak.
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post #6 of 8 Old 10-19-2021, 08:30 AM
Waterluvr
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Location: South Bend, IN
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Garage
One of two things I see in the shop with thirsty fuel trims are either shorted driver wire to the injector(s) or failed drivers in the pcm.

Get a meter out, turn the ignition to run with engine off and see if you have continuity to ground on the injector plugs. If so, unplug the pcm connectors and test again. If the continuity to ground goes away problem is the pcm. Still there it's a short in the harness and some misfire codes are usually stored.

There's nothing in the pcm programming code that will allow for ongoing fuel trims that high.
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post #7 of 8 Old 10-19-2021, 10:00 AM
jtec
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IIRC - that fuel trim* is a calculation basically a o2 sensor/cat efficiency rating. I would suggest you read the owners manual.

The short - your good you want a high number here,

PS adaptives (STFT LTFT) range 0-33%

* STFT B1S2 - 99.2 (%)

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #8 of 8 Old 10-20-2021, 11:44 PM Thread Starter
x4rattler
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I'll get the meter out tomorrow it's 28 degrees and the wind is a blowing.
Yes on the shredder valve. 50 PSI strong. Half hour drops six pounds. Two days
drops to zero.
This beast has always started up first thing every time.
It idles at 660 rpm always, but lately misses big time.
I can feel it shaking
Code 201
Code 351
Both on number one cylinder.
No other codes-none-zippo
Why isn't there any codes popping up?
And why does the throttle respond so well?
Right now it has 85 miles at just a half tank and I stuffed it.
I have a gas locking gas cap on this, so no gas thieves.
Whats with this ignition fluctuation or is it meaningless
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