3.0 Left bank dead

87yjtoy · Jul 30, 2009

Hi new guy here, 1st post. My brother in law just aquired an 03 ranger w/12000 miles. It belonged to his Dad who cant drive anymore. He got it & drove it about 1500 miles back & forth to dads taking care of that kinda stuff. On the way home last week it started running rough & then will only go about 30 mph. I did some troubleshooting & it appears that the 456 bank is not getting any fuel. Fuel pressure is 38psi & the plugs have been cleaned on that side. Codes are misfire on 4,5,&6. Lean & rich codes are there also.
Any idea before it goes to the Dealer for TS would be much appreciated.

Runnin'OnEmpty · Jul 30, 2009

Welcome 87TJguy.
(I'll keep it quiet about you being a Jeep guy,
since I also have a Cherokee. :yahoo:

)

Since bank 2 has all the misfires, my first guess
is a faulty coil pack. The later 3.0s have a 'lost spark'
ignition system, which has a different electrical polarity for
each bank. It's easy to check for spark on that side
though, by simply attaching a spare plug to a wire,
grounding it and see if it fires......

mixwell · Jul 30, 2009

I would agree with Runnnin, since its not just 1 cyl misfiring but one whole side I wouldn't maybe a faulty coil pack no putting out spark. With that new of an engine I couldn't see much wear and tear use on it.

I would try to see if you can get the plug wires on that side to show a spark, via a wire or whatever and if they're all dead I would for sure check out the coil pack. hopefully thats all it is. You might want to pull your spark plugs just to verify they're looking in functioning order.

I would think another cause could be your fuel injectors putting out too much fuel on one side which would smother the chamber with fuel and not give you the right fuel/air mixture which I would find a very small chance in but for sure I would first point to the CP . Good Luck ! and welcome to TRS

87yjtoy · Jul 31, 2009

Thanks for the replies. That was my first thought also. The plugs are firing, but checked with a spark indicator & I pulled the plugs to clean them I tested them on the end of the wire. Nice strong sparks. The plugs were very dry & no fuel was evident on them.

Thanks on Jeep thing

mixwell · Jul 31, 2009

If youre getting spark on the whole side maybe the injectors are clogged? You said you get 38psi but could it be the 1 side may be clogged ? would be a weird scenario but If you have spark and it is dry maybe they're not receiving enough fuel ? :icon_confused:

Runnin'OnEmpty · Jul 31, 2009

87yjtoy said:
Thanks for the replies. That was my first thought also. The plugs are firing, but checked with a spark indicator & I pulled the plugs to clean them I tested them on the end of the wire. Nice strong sparks. The plugs were very dry & no fuel was evident on them.

Thanks on Jeep thing

This is indeed a weird one.

One thing that comes to mind is that with the lost/wasted spark system,
the coil packs fire all the plugs on both the intake AND exhaust
strokes. This might mean that the bank 2 plugs that are firing good,
could be getting the spark on the exhaust stroke.......???
So don't disregard possibly faulty coil packs just yet.

For 1 entire bank to be fuel starved, like Mixwell says it seems like
maybe a fuel line problem on that side?

The only other thing I can think of is the cam position sensor. These
engines are notorious for bad cmps, and that's what times the fuel
injector pulses. I can't see how that would cause only one bank to
not have fuel, however. Especially since there's no cmp code.

This is a tough one; just throwing out things to think about.......
:icon_confused:

87yjtoy · Aug 1, 2009

The injector issue is what I am thinking but what about a wiring issue to that side?
Is the injector harness pluged in side to side or all together? Havent had time to do more troubleshooting yet, so keep the thoughts coming & thanks for the replies

Pat

Runnin'OnEmpty · Aug 3, 2009

87yjtoy said:
The injector issue is what I am thinking but what about a wiring issue to that side?
Is the injector harness pluged in side to side or all together? Havent had time to do more troubleshooting yet, so keep the thoughts coming & thanks for the replies

Pat

Pat, I looked at my 04, and there's no plug in for the separate
injector banks; both sides feed into one large loom which includes
the wiring for the MAS and coil pack. The loom then goes into the
ECM/PCM. If there's a wiring break, it would have to be at the
ECM main plug or inside the loom itself.

I still think it might be a coil pack problem. If one side of the coil is
not firing, you'd still get spark on both banks, although one bank
would fire on the exhaust stroke and not provide any power.

Try checking the resistance on one of the paired coil terminals,
such as #3 and #4. Mine shows about 105K ohms on that
particular coil pair, so if you get an open or a short on yours, that
would confirm a bad coil.......

One other thing, are you sure about one entire bank dropping out,
or could it be only 2 cylinders? Reason I ask, is that the coilpack
plug has three trigger wires going to the coilpack, so if one of those
is broken at the plug it would drop 2 cylinders.
(Mine looks to be in a strain at that point, with the wires showing
and possibility of a wire pulling out of the plug......?)

Runnin'OnEmpty · Aug 4, 2009

OK, disregard the last paragraph in the previous post;
I see you have misfire codes on cyls 456/bank 2.

Relating to the injectors on that bank, you could put a
noid light on them to confirm they're not firing.

You could also unplug the main wiring harness to the
ECM/PCM, clean it with electrical contact cleaner, and
reassemble to see if anything changes. The PCM plug is
located right below the hood/cowl gap, so it's possible
water could get into it......?

87yjtoy · Aug 6, 2009

Thanks for the replies. I will keep looking at the coil pack. & check the firing.

Pat

griz700rocket · Sep 26, 2017

I have a 2000 Ranger 3.0 I acquired a while back that is doing this except it's missing on 1, 2 and 3. Went from running smooth to this all at once. Anyone else have any input? So far I've done all new plugs/wires and pulled plug wires to check for spark. All wires are getting spark but not sure if it's just the waste spark from the other side.

Dangerrangers · Sep 26, 2017

Coil pack ,their easy and cheap, takes maybe 10 minutes .

griz700rocket · Sep 26, 2017

Tried swapping wires from one side of the coil to the other with no change. Did compression check and 1-2 only had 30lb. Other side was 100+. Motor has over 230k. Ranger is getting a 302 swapped but i was hoping to get a little money out of this 3.0

SLMoss · Nov 16, 2017

I am having the exact same problem!! I swapped motors from a 2003 Ranger Edge 3.0 FF to a 1998 Ranger XLT 3.0 non. I had to change several things, but now 4,5 and 6 are not working right. Can't go over 30 mph. You can touch the exhaust under the truck on that side too.

3.0 Left bank dead

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