Engine Stumble - Jeep Patriot Forums
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post #1 of 62 (permalink) Old 11-27-2009, 06:49 PM Thread Starter
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Engine Stumble

I've noticed lately that my engine has started stumbling (intermitantly) when I'm stopped at a trafic light or just idling. The RPM drops a little below 500 and it almost stalls and then it picks up again to normal idle around 600-700. It seems like a fuel problem to me. I only have 32000kms on it so i doubt the plugs need to be changed yet. Even if they did I think the engine would run rough all the time. I doesn't happen every time I'm sitting at a traffic light but it happed a couple of times the other day and to my wife also. I took it to the dealer and it wouldn't do it for them. Which is tipical. Has anyone else had this problem?

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post #2 of 62 (permalink) Old 11-27-2009, 07:32 PM
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i have this problem about 3-4 times a week. ill just be sitting at the lights. and itll start dropping revs, i let go of the brake, and it picks up rpm right away again.

i dont know what it is and the dealer hasnt been able to do anything, but its very weird. since i changed my plugs at 50000km and the new ones only have 12000km on them. but i havent done the major major services. just oil changes.



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post #3 of 62 (permalink) Old 11-27-2009, 08:49 PM
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maybe....

radiator fans kicking in?
aircon kicking in?
something to do with the brake servo?





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post #4 of 62 (permalink) Old 11-28-2009, 11:32 AM Thread Starter
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No its not anything kicking in. Im pretty sure of it. also jessi, now that you said it happens with your brake on, i'm starting to think that i'm pretty sure it happens with my brake on too. maybe its got something to do with the brake assist?


Last edited by JeepHankins; 11-28-2009 at 11:34 AM.
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post #5 of 62 (permalink) Old 11-28-2009, 03:04 PM
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its definitely something to do with the brakes. do u have a cvt or manual.

i got the cvt, 2.4L, 4x2

but it happens to me when im already at a complete stop.



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post #6 of 62 (permalink) Old 11-28-2009, 06:56 PM
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Yep, I noticed that problem once. Stopped at a light, daytime, dry, 50ish temp -- nearly stalled. I couldn't see a reason for it; I shifted to neutral, revved it up a little, and haven't had the problem since, though sometimes the idle speed does seem to drop a little when stopped at a light with the brake applied.
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post #7 of 62 (permalink) Old 11-28-2009, 07:04 PM Thread Starter
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I have a cvt 2.0L

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post #8 of 62 (permalink) Old 11-28-2009, 09:05 PM
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Same deal here too..happens approx once or twice a month,,Canadian gas?
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post #9 of 62 (permalink) Old 11-28-2009, 09:42 PM Thread Starter
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I've looked through the service manual and it is useless. basicly you have to hook up to the pat with starscan and look for a fault code and trouble shoot from there. Its very hard to find out info from that service manual. So far I've found for "Engine stalls or idles rough 1. Idle speed too low. 2. incorrect fuel mixture 3. Intake manifold leakage 4. faulty ignition coil(s) 5. contamination in oil control valve (OCV)."
I can't find out how to trouble shoot any of these

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post #10 of 62 (permalink) Old 12-05-2009, 11:43 AM
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Mine is a 2009 w/2.4-cvt-4x2 and is doing the same thing. Has happened 3 or 4 times. I dont think it has anything to do with the brake, jjust a coincendence as the only time it does it is when I have been driving and come to a stop so naturally have foot on brake. I have hooked mine up to starscan and found no faults or any sensors acting up. Looked for tsb's but at the moment there are none.
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post #11 of 62 (permalink) Old 12-05-2009, 11:50 AM
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Perhaps a sticking Idle Control Valve? Maybe a throttle body cleaning is needed or something? Remember these are drive by wire vehicles and the computer controls opening and closing the throttle. I don't know if these things even have an ICV to be honest since the computer could just crack open the throttle plate to adjust idle speed.

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post #12 of 62 (permalink) Old 12-05-2009, 12:34 PM
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I haven't had this issue with my Pat yet (34,000KM and counting), however, I did have it with my last vehicle and I found it happened everytime I filled up at Irving or PetroCanada (PetroCanada being the worst).

So I blamed it on bad gas and have been filling up at Ultramar ever since with no issues.

Last edited by klingoff; 12-05-2009 at 12:39 PM.
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post #13 of 62 (permalink) Old 12-05-2009, 07:07 PM Thread Starter
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I put in Lucas fuel additive last week and I havn't had it stumble since.

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post #14 of 62 (permalink) Old 12-05-2009, 07:38 PM
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Sounds like water in the gas. Condensation in the fuel tank? Warm and humid in the day then cold at night will cause condensation on the inner tank walls. My F150 was notorious for this. STP and a full tank keeps it in check.

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post #15 of 62 (permalink) Old 12-06-2009, 08:10 AM
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What type of Lucas fuel aaditive you put in? I'm seing the same problem with my 2007 Pat.
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