[SteandDebbie]

Hi Joriss,

As you see the picture is exactly how we run the car. It was a company lease car before we had it but never had a battery cover or cold intake pipe.

I think it will go on but I won't be able to check until Friday. (Currently sat in airport travelling to hungary).

I keep looking on eBay for the cover and pipe but none have come up yet. I guess they don't get wrecked so often!

 

[whawho50]

missing pat

i too have pat, limited 2008 bought new. it started to miss at 1500- 2100 rpm, @ 38000mi..now has 67000mi. I live in Ft. Lauderdale, Fl , we have two seasons, summer (80-95 deg.F) and not summer (65_80 deg.F) (no fall, winter or spring). I have tried plugs, battery, and one coil, (no.1 (as dealer diognostic indicated no.1 was missing), It still is missing. I have not put much effort in solving this problem but like to solve. I have always felt an underlying cause was low voltage. The dealer is very cooprative and replaced evap. system monitor to correct stalling at idle (63000mi.) no stalling so far. It stiil missing, ambient temp. a factor, runs better at cooler temp. Ed @ whawho50@yahoo.com

 

[Jorisss]

I replaced the battery 2 weeks ago (I wasn't able to post for some time) with the battery named in SteandDebbie's post.
First I thought it fixed the stutter because it wasn't stuttering at all anymore. Since 2 days the stutter is back again :-(
Then I remembered, I thought before I fixed it after replacing the downstream O2 sensor. The stutter was away for 2 weeks and then came back. Probably, I removed the battery clamps too when replacing the O2 sensor.
So, resetting the ECU by removing the battery clamps makes the stutter go away for some time. As the ECU is self learning there is something that makes the car stutter after some time. So I really start to think the problem is software or ECU related and not something what can be fixed by replacing parts or sensors.

Wondering if SteandDebbie still has no stutter issue's.

 

[endless]

My 2007 manual 2.4 'chugs' in second gear...is this the same problem you guys are talking about?

 

[Jorisss]

My 2007 manual 2.4 'chugs' in second gear...is this the same problem you guys are talking about?

Sounds like the same problem. In second gear it's worst, in third and fourth gear it stutters also a little bit.

 

[Ignatz]

Thank you Jorisss for putting me onto this thread. There's a lot here, but we don't seem to have an "Aha, I got it fixed!" posting.

My Pat went about 100 miles today and it was flawless until mid-afternoon. Then under heavy acceleration while passing a slower vehicle on the highway, ignatz kicked twice (that is unusual, usually it happens only once in one situation. I was doing maybe 55mph and moved up to about 70 maybe. Kicked once at the outset and once more during the passing pattern.

I took it to the dealer for state inspection last month and they couldn't duplicate the problem. Doesn't throw codes. CVT was replaced about 20,000 miles ago under warranty. Plugs have about the same miles on them.

Seems if it was a plug, it would do it the whole time. My first thought was the CVT slipping internally. Further reflection it does seem electrical, as if it lost power completely for an instant, like all 4 cylinders cut out for a couple rpms, then cut back in. I guess I'll just live with it until it goes totally haywire or at least throws a code they can read.

 

[BWhitty]

Mine is still stuttering from new-- it's driving me nuts. I just figured I'd post here to get it on record.

 

[sp00ge]

I had another thread going a few months back, same issue. No sense bumping that one.

I'm having the same issue. 2008 2.4 Manual tranny @78k. When the engine is cold, it's fine, but when it's warmed up, the engine hiccups during acceleration, typically between 2000 and 3500. The problem goes away temporarily when the ECU is reset by disconnecting the battery.

So far, plugs, crank sensor and TB have been replaced. Battery was also replaced, but that was because the old one crapped out on me a few weeks back.

Also, the gas mileage has TANKED. I used to get between 25-32mpg, now I'm probably getting closer to 10mpg. I only make short drives around town, no more than a few miles a day, never shifting over 4k. Yet, in the past week I've gone through a quarter tank in about 20 miles. The tail pipe is pretty black, so it's clearly running really rich, no noticeable smoke and exhaust doesn't smell rich at idle.

My guess would be it's a computer issue, but unfortunately, I don't have the money right now to throw at a guess, especially a costly one.

 

[Ignatz]

Was having performance issues with the MIL's Saturn and it went to the GM garage. GM and several other automakers are attributing performance problems to fuel that, while meeting government specifications, is inferior to what it could and should be.

Following their recommendations for the Saturn, I've switched Ignatz to a steady diet of what GM calls "Top Tier" gasolines. There are probably 2 dozen brands on their list, but the only ones in this area are Mobil, Exxon, Shell and Phillips 66. I also added a bottle of Techron fuel system treatment.

I think its running better, in fact no issues at all today. The stutter never seemed weather related, but if it was, the last week has been a good test. Weather conditions have been all over the board in the last week. Two snowstorms; temperatures as cool as -10F and as warm as +40F. Last 2 days its been flirting with 32F and quite humid -- fog coming off the snow. The only thing we haven't gotten is summer heat. That's probably 6 months away.

 

[Jorisss]

Sorry to hear you have the same problem Sp00ge. I looked up your thread and did remember it. Have you ever replaced the PCM? I also think by now, and after all the parts I replaced, it's software or PCM related.
This morning, I did put in the old battery again, as the one SteandDebbie mentioned didn't fit quite well and it made the intake tube not fitting anymore. Did some riding afterwards and no stutter. Probably because the system being powerless for an hour or so. Guess the stutter will come back in a few days.
Ignatz, I tried every possible gasoline and not 1 did made the stutter go away. Adding different brands of fuel injector cleaner did make the car stutter less, but I never got rid of it at all.
I don't think it has anything to do with bad gasoline.
SteandDebbie, still no stuttering? Could you please update?

 

[Creation]

Lately I've been getting studdering pretty often. If I'm in auto shift sitting at a light, my rpms will just start dropping randomly. Yesterday it even stalled itself because of it. Plus I've been getting a really bad vibration throughout the car at idle.


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[The4WDPatriot]

Lately I've been getting studdering pretty often. If I'm in auto shift sitting at a light, my rpms will just start dropping randomly. Yesterday it even stalled itself because of it. Plus I've been getting a really bad vibration throughout the car at idle.


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Too much low? Haha just kidding of course.

Has anyone tried running a fuel injector cleaner and seeing if it helps?


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[Creation]

I've been running 89 gas for the past 2 weeks or so, hoping that would degunk anything.


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[The4WDPatriot]

Mines been running pretty good but I'll probably fill it up with a tank of the Shell VPower next time I'm near E.


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[Jorisss]

Too much low? Haha just kidding of course.

Has anyone tried running a fuel injector cleaner and seeing if it helps?


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Yeah, tried 8 bottles of fuel injector cleaner (already on page 2 or 3 of this thread) but didn't make the stutter go away.
It's definitely software or ECU related.

 

[Ignatz]

I guess what has me confused is that its intermittent, but only when I'm putting a load on the engine, really making it pull. I'm still thinking its a bad plug, but why only once or twice during a 5-6 second acceleration? I'd think it would run rough all the time, or at least for the duration of the acceleration. As long as I feed it slow, there's no problem; its when I'm going up a hill and maybe want to pass someone, or when the speed limit drops to 30 for a town in a valley, then back up to 50 as you climb the hill. In a longer acceleration it might stutter a couple times. I'd think a bad plug would act up the whole time. I've had rough running engines in other vehicles, but at higher rpm it was less noticeable. In my case its more noticeable, but only for a 1/2 second then it gives me 2-3 seconds, and then another stagger before 2-3 more seconds of solid acceleration. Perfectly smooth at idle.

 

[480KREEPIN]

What you just described sounds more like a coil problem than a plug Ignatz.

 

[Ignatz]

What you just described sounds more like a coil problem than a plug Ignatz.

Hmm, that's food for thought, 480KREEPIN. It really could be electrical. What makes you say that? Say on.

This feels a bit like when my old Volare had an ignition short. Accelerating up a hill the wire would pull against whatever grounded it. When it started to stall, there was no more pull, the engine would catch again. Did that a few times before it grounded out enough to blow a fuse. This has that full engine feel, like its quitting for a fraction of a second, not just one cylinder skipping.

I still imagine the transmission slipping then catching, if that is a possibility in a CVT. Except that now it does it more frequently on a long acceleration. At first it was only once near the start of the increase in acceleration.

I don't have the check engine light on. That also leads me to think its in the transmission.

Any idea what a coil costs for a Patriot? (We have 4 of them)

I could buy one new one and try it around till the problem stops.

 

[Jorisss]

Ignatz, did you read the whole thread? All the things mentioned are already tried and didn't fix the stutter, at least not on my Patriot and some others.

 

[silverflash]

fyi, my 2013 has done this since new.

driving without the snorkel on seems to solve it. i prefer not to do that however so i just live with it...

my previosu car did the same exact thing until i went to a warm air intake and it completely did away with the bucking/stuttering....