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Old 08-30-2010, 09:32 PM   #1
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Any ACTUAL problems with 3.8L powerplant???

First... I'm posting this in the JK forum cuz I dont want start the latest bitch-fest about how some folks hate the JK. I got that. No need to reitterate their frequently expoused positions on how much the JK sux. Whatever.

What I AM looking for is real-world, first-hand knowledge of any ACTUAL problems with the 3.8 engine in JK's.

I'm talking FIRST HAND....what YOU have experienced. Not something you heard from your third cousin's girl friends neighbor, etc. A problem YOU can speak about from your own experience.

Here is why I ask. After putting about a million miles (litterally) on a wide veriety of vehicles with the clasic Chevy 5.7/350cid workhorse....I knew it like the back of my hand....swore by it....trusted it implicitly. Then came time to buy my latest suburban. Which mounted a new-fangled 5.3 aluminum engine. How could they dare replace my precious cast-iron ROCK with some glorified beer-can? I hated it the moment I drove it off the lot. But I kept driving it....and driving it...and driving it...and driving it....

I'm at 215,892 miles. The ONLY thing I've done under the hood is change the oil about every 5k miles....changed the battery 3 times. replaced the AC compressor once. Changed the air filter, twice. NEVER changed the plugs or wires or coolant or ps fluid or trans fluid or any other "Routine maintenance". I got 20mpg the day I bought it 8 yrs ago....I get 20 mpg today. In short.....that gloried beer-can is doing a mighty fine job of hauling around my 6800 rig and occasionally an 8000# trailer.

It makes more HP from less fuel that the old 350 could ever have managed. AND it can burn corn juice (E85). Yeah my mileage drops to 17mpg....but it costs me $0.40/gal less when I can find it. 90% of the time....I just run good ole 87 octane gasoline.

So.....maybe al the hate'n on the 3.8 is just a matter of folks not liking what they dont have much history with.

Which bring us back to my question: Has anyone WHO HAS ACTUALLY OPERATED A 3.8 for more than a weekend.....had any issues?

As always, thank you all for your insight.

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Old 08-30-2010, 09:58 PM   #2
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Right now my problem with the 3.8 is high oil consumption. One quart every 2000 miles over the last 36,000 miles. This last oil change was different. So far 3,000 miles and down only 1/2 quart. Different dealer did the last change.l don't know what oil they used but consumption is different. That has been my personal experience so far. Otherwise no problems.

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Old 08-30-2010, 10:26 PM   #3
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1qt every 2k miles !?!?!?!

That's freak'n INSANE!!!

Is it leaking or buring? Stuck valve?
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Old 08-30-2010, 10:39 PM   #4
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No problems at 3800 miles.
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Old 08-31-2010, 05:30 AM   #5
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i have 30,000 miles now between my 2009 unlimited and 2010 2dr, and have had zero issues. I will admit that (gulp) i have had a few of the first generation 3.8's in some other vehicles that may or may not have been shaped like a minivan. the Jeeps have never let me down or left me in a situation where i needed more power. The unlimited has pulled a 5 x 10 cargo trailer from Bristol IN to Key West FL even. Granted I didnt expect super duty performance on that trip, but it wasnt a white nuckle ride either. I have switched them both to 5-30 oil (euro spec for these engines) to stay ahead of any oil consumption problems. I havent had any oil issues, but dont want to start either.
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Old 08-31-2010, 05:39 AM   #6
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I have 68,000 miles on an '08 and have had no engine problems at all. It's down 1/4 quart at every 6,000 mile oil change (Mobil-1).

It has a persistent light smell of coolant and I have to top off the reservoir at every oil change too. I've had it checked 3 times and the dealer says it's fine. I also had them R&R the coolant at 50,000 miles, prior to a long road trip to AZ and back.
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Old 08-31-2010, 06:37 AM   #7
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5,657 miles without a single issue. Dealer changed oil at 3,000 miles. Switched to Moble 1 and will change again at 6,000 and then every 6,000 thereafter. No mention of burning oil by the Dealer. Will ask the next time its changed. Not the most powerful engine I have ever driven but with Superchips Flashpaq, Cold Air Induction Kit and Performace Cat Back Exhausts it gets me where I want to go.
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Old 08-31-2010, 06:47 AM   #8
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Quote:
Originally Posted by landmarkbuilder View Post
I will admit that (gulp) i have had a few of the first generation 3.8's in some other vehicles that may or may not have been shaped like a minivan.
that made my morning.
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Old 08-31-2010, 07:25 AM   #9
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Approaching 60k on my '08 Unlimited and the only engine issue to speak of was some moisture in the spark plugs (?) that was causing a misfire and throwing up a check check engine light, but the dealer changed out the plugs and wires at no charge and all is well! My problems have been with the fit and finish of the body, not the 3.8L engine.

I'm not from a Jeep tradition so maybe that's why I'm not all up in arms about it but I honestly don't see what all the fuss is about. Chrysler had an engine in their stable that would meet the needs of a majority of ithe vehicle's intended market and heaven knows there's plenty of aftermarket solutions out there that they didn't have to overwork the design team to reinvent the wheel!
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Old 08-31-2010, 11:09 AM   #10
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So far, it sounds like a good engine. Of course time will tell. They are still too new to see what they will be like beyond the 100k event horizon. My hunch is that they will be just fine, but we shall see.

As for towing capacity....I'm not planning to tow anything over the 3500# limit, and even that will be rare.

As for performance....my wife drives a corvette and I'm a pilot. So I have other options when I need a fix for "going fast".

I just want my current TJ and future JK for casual cruising and occasional light wheel'n.

even 1/2 qt of oil vanishing in a nearly new engine is wierd, though. And the coolant issue sounds irritating but not concerning (yet).

Keep the feedback coming. I think this is pretty helpful at cutting through all the paranoia.

NO...thats not an invitation to open the flood gates for pundatry. Still looking for FIRST HAND knowledge of issues with 3.8 engines.

THanks all.
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Old 08-31-2010, 11:27 AM   #11
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The engine is not new-


Quote:
Originally Posted by TJ-Newbie View Post
So far, it sounds like a good engine. Of course time will tell. They are still too new to see what they will be like beyond the 100k event horizon. My hunch is that they will be just fine, but we shall see.

As for towing capacity....I'm not planning to tow anything over the 3500# limit, and even that will be rare.

As for performance....my wife drives a corvette and I'm a pilot. So I have other options when I need a fix for "going fast".

I just want my current TJ and future JK for casual cruising and occasional light wheel'n.

even 1/2 qt of oil vanishing in a nearly new engine is wierd, though. And the coolant issue sounds irritating but not concerning (yet).

Keep the feedback coming. I think this is pretty helpful at cutting through all the paranoia.

NO...thats not an invitation to open the flood gates for pundatry. Still looking for FIRST HAND knowledge of issues with 3.8 engines.

THanks all.
Chrysler brought this engine out in 1991, although there have been the usual computer controlled changes--ign/timing/fuel distribution-etc, but-

The basic engine is almost 20 years old, I don't think there's any question on the dependability of the 3.8L V6 !!

Even thought theuy haven't cured the oil consumption problems, mine doesn't use any oil between changes !!

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Old 08-31-2010, 11:42 AM   #12
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Ahhh.... thats a good tid-bit of info.

I didnt know the 3.8 had been around that long.

Now I know its just "new" to the JEEP. cool.

Thanks
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Old 08-31-2010, 11:45 AM   #13
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Yea, can you believe it, they actually used this little gem in the --


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Originally Posted by TJ-Newbie View Post
Ahhh.... thats a good tid-bit of info.

I didnt know the 3.8 had been around that long.

Now I know its just "new" to the JEEP. cool.

Thanks
BIG Chrysler New Yorker !!

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Old 08-31-2010, 11:57 AM   #14
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Ha Ha Ha

"BIG" New Yorker!!!

LMAO

I had a 1979 New Yorker with a 360cid when I was in High School. 10mpg

No, it wasnt a hand-me down. I wanted it and I loved it.

I thing you are referring to the "BIG" new yorker which was a made-up Dynasty.

That gives me more data points to research.

Thanks again
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Old 08-31-2010, 12:42 PM   #15
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Had 37,000 highway miles on my '08 when I traded it in a couple weeks ago. Have 1600 miles on my '10 rubi. The '08 didn't use any oil.....ran mobil 1 syn, and changed it and the oil filter every 7000-9000 miles or so. Ran perfectly.
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Old 08-31-2010, 01:04 PM   #16
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I have 37k on mine about 7 of which is on me. Still running strong, no mods, small oil consumption but nothing to worry about between oil changes. I'm on my second oil change with castrol 5w30 syn blend, dont know what was in it when i bought it. I check the coolant level every oil change and so far nothing missing. Over all I'm happy with it.
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Old 08-31-2010, 03:01 PM   #17
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Re - title thread......................

3.8 PowerLESS Plant.

Bingo.
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Old 08-31-2010, 04:05 PM   #18
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08 2 door here. 6spd manual. 73k miles in two years. Daily driven, wheeled regularly. Drive it like I stole it most days.

No engine issues.
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Old 08-31-2010, 04:05 PM   #19
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silvrero won't be happy until they drop a V16 in it!
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Old 08-31-2010, 04:19 PM   #20
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38k on mine, no "real" problems.... only issue is a little lifter knock at startup, but this is only after about 2500 miles on an oil change. Seems that the Pure-One flow back valve is failing in a batch of filters I bought.... Dealer said don't worry, you got a lifetime warranty.... Hope I don't have to test that theory
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Old 08-31-2010, 04:43 PM   #21
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Only issue I've had under the hood was my battery dying after 16 months without warning.
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Old 08-31-2010, 05:01 PM   #22
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Had my second oil change today at 5700 miles. Asked Dealer how much I burned from last change at 3,000 and they told me almost none. Will change ever 6,000 miles from this point forward using Mobile 1 synthetic oil.
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Old 08-31-2010, 07:05 PM   #23
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Again....It seems like those who actually run the 3.8 are having a positive experience.

As for the accusations of it being powerLESS....I'm confused. On paper the 3.8 puts out 205hp@5300RPM and 240 foot-pounds of torque at 4000rpms. 0-60 in 9.7 seconds. In an 07 Unlimited 4dr sahara with 4wd at 4269 pounds.

My 03 with the 4.0l I6 supposedly pumps out 190hp@4600RPM and 235 foot-pounds of torque at 3200 RPM. 0-60 in 9.8. At 2018 pounds.

The 3.8 doesnt seem to have a significant "LACK" of power. I guess I'm missing something. Smaller displacement...more peak horsepower....more peak torque... 0.1 seconds faster....hauling TWICE the weight. Sounds kinda nice to me.

Again. I'm a noob. But I'm failing to see the justification for the witch-hunt. The numbers just dont support the claims that the 3.8 is inadequate.

Come-on folks....surely SOMEBODY out there (REAL WORLD FIRST-HAND EXPERIENCE with the 3.8) has something bad to say about them. It cant all be delusional paranoia.

Otherwise I just might get the impression that the 3.8 is actually doing a dang good job. Consumer Reports sure seems to like it.
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Old 08-31-2010, 07:18 PM   #24
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The only naysayers are young drivers that are used to 5/6spd immediate Horse power application in LIGHT SEDANS and they buy a JK with an AUTOMATIC TRANSMISSION !!


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Again....It seems like those who actually run the 3.8 are having a positive experience.

As for the accusations of it being powerLESS....I'm confused. On paper the 3.8 puts out 205hp@5300RPM and 240 foot-pounds of torque at 4000rpms. 0-60 in 9.7 seconds. In an 07 Unlimited 4dr sahara with 4wd at 4269 pounds.

My 03 with the 4.0l I6 supposedly pumps out 190hp@4600RPM and 235 foot-pounds of torque at 3200 RPM. 0-60 in 9.8. At 2018 pounds.

The 3.8 doesnt seem to have a significant "LACK" of power. I guess I'm missing something. Smaller displacement...more peak horsepower....more peak torque... 0.1 seconds faster....hauling TWICE the weight. Sounds kinda nice to me.

Again. I'm a noob. But I'm failing to see the justification for the witch-hunt. The numbers just dont support the claims that the 3.8 is inadequate.

Come-on folks....surely SOMEBODY out there (REAL WORLD FIRST-HAND EXPERIENCE with the 3.8) has something bad to say about them. It cant all be delusional paranoia.

Otherwise I just might get the impression that the 3.8 is actually doing a dang good job. Consumer Reports sure seems to like it.
Now I've had quite a few years of driving fast cars and I was not surprised on the lack of acceleration in the JKU AUTOMATIC-it seems-

Chrysler did such a good job on the design and layout of the JK (2007), but

They used a designer fired from a camel rental company, to set up the cooling/shift points/No. of gears in the JK auto--it's PITIFUL

Now I dion't mind the shifting lack, cause I manually control that and the cooling is all taken care of, but

When you here complaints of the lack of power in the 3.8L---IT's because of the AUTO and it's sad application--especially when larger tires are added and the differential gears aren't changed--ya gotta make changes, then it's AOK !~!

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Old 08-31-2010, 07:27 PM   #25
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14000 km. Not much offroading, but drive it HARD in the city. No problems. Lots of power. I think those who complain about it being gutless forget it is a 6 speed. If you wind up the RPM's some, it goes like stink.
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Old 08-31-2010, 07:40 PM   #26
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AH HA!

So its the transmission they are crying about.....not the engine.

Well.... Since I'm getting to be an old fart (40) I have the maturity to know that whatever it is....will wait. And if I gotta be in that much of a hurry....I shoulda planned better.

Like I said, I have other outlets when I feel a need for speed.

Cooling issues are troubling, though. Maybe a set of electric fans could help. Thats my next "major" tweak to my TJ.....should save me 2-3 MPG. And for me, every additional MPG works out to $500/yr in my pocket.

Which puts me that much closer to affording a JK.
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Old 08-31-2010, 07:48 PM   #27
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Well, good you're thinking ahead, but additional electric fans won't work in the JK/JKU-because


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AH HA!

So its the transmission they are crying about.....not the engine.

Well.... Since I'm getting to be an old fart (40) I have the maturity to know that whatever it is....will wait. And if I gotta be in that much of a hurry....I shoulda planned better.

Like I said, I have other outlets when I feel a need for speed.

Cooling issues are troubling, though. Maybe a set of electric fans could help. Thats my next "major" tweak to my TJ.....should save me 2-3 MPG. And for me, every additional MPG works out to $500/yr in my pocket.

Which puts me that much closer to affording a JK.
The Auto stock cooler, is an integral part of the A/C Condenser and the system REQUIRES an AUXILLIARY cooler, to keep the auto temps below 250° F-

I have two, an aux cooler in front of the condenser, so that when you turn on the A/C, the radiator fan comes on automatically and helps the auto cooling and--

I also have a racing, aluminum finned, auto cooler under the bumper--

I've disconnected the stock cooler completely and my auto is happy as a clam !!

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Old 08-31-2010, 07:59 PM   #28
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Sweet!!!!!


Nothings better than a happy clam.

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Old 09-01-2010, 04:09 AM   #29
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And your torque/hp numbers are at the crank. The autotranny translates that hp to about 150 hp at the rear wheels when the rubber meets the road.
Which would be fine if it also had 250 ft lbs of torque at the same time, say from 1500 rpm or so. A nice linear power band at low rpms ---- like a diesel....
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Old 09-01-2010, 07:33 AM   #30
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I am by no means a wrench-turner so maybe I don't know what the big deal is, but I do think that the 3.8L is fine but could have been mated with a better transmission. I see Nissan and Toyota SUVs at the same weight range as the Wrangler Unlimited with 5-speed automatics and having more gears to choose from seems to aid in performance and economy. I'm thinking if the Jeep had something like this, burying the low 1st gear a little lower and giving some higher gearing closer together, plus better tuning (Superchips rock btw) they would have a better offroad machine while still keeping the mall crawlers happy at the same time.

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