Challenger Stuttering at 2000 rpm

[AndyP100]

Hi, New to this forum.
I have a 2011 Challenger that I have just bought a couple of weeks ago, and it seems to be stuttering a bit at about 1600 to 2000 rpm when holding the accelerator steady or accelerating. At first I wondered if I was just not keeping the revs up enough but I am getting more convinced that it is a fault. Just wondering if anyone has had this problem before or has any Ideas.

Regards
Andrew

[old Jack]

Hi Andrew

Welcome.

Manual or auto trans?
What gear are you in?
Speed?
How many kms on the Odometer?

OJ.

[AndyP100]

Don't know if I needed to mention that it's a diesel

[AndyP100]

Hi Jack. It's a manual and it seems to happen in most gears if it is at about that engine speed. If I put my foot down it fairly quickly clears up as the revs go up. Today I noticed it at about 60kph in 3rd which doesn't seem to slow for that gear?

[AndyP100]

It's got about 130000km on the clock.

[littleriver]

Just a few starters

Have you checked the airfilter?

Also check your MAF sensor .. you may have to by some pressure pack cleaner (crc)

3rdly when was the fuel filter last changed ?

...

[old Jack]

When you say "stuttering", is it that if you hold the accelerator pedal steady with the engine rpm between 1600 and 2000rpm does the engine rpm flucuate, is so by how much? or does it feel more like a flat spot/dead zone?

Does it do it in the same rpm range when you are both gently acceleration through the rpm range and decelerating through the rpm range as well as when you hold the rpm within the range of 1600-2000 rpm.

Does it do it when the engine is cold or hot or both?

Does it get worse or better if going up or downhill?

When was the last time the engine was serviced by a MItsubisi dealer?

What does the service history look like?

OJ.

[AndyP100]

Thanks for the replies.

I haven't checked the filters yet. It has a perfect service history but when I bought it only a few weeks ago, it had been in the dealers for about 6 months.

The stuttering i am referring to is a bit like you would get in a petrol car if it was misfiring or just missing if you were in too high a gear, but you can be going along steady and it just does it. Not down hill but slightly more up hill. That's why at first I thought it was just me not being used to it and not changing down quick enough. I was wondering if it could be the EGR valve?
My thoughts are that if it was a fuel filter it should struggle more when accelerating than at a low steady speed.
Any idea what speed/gear combinations are too high?
Sometimes it is chugging along at 1200 rpm happily.

[nj swb]

Probably a complete red herring, but it sounds a little like the issue I had when my NT Pajero was new (to me) - on cruise control on the highway, hit a slight rise and the engine felt like it was misfiring, just before the torque converter unlocked.

I reported it to Mitsubishi when I had them check it over just after I bought it, and they applied a transmission software update that fixed the problem.

I severely doubt that a Challenger would have the same issue (different engine and transmission) - but you never know? Perhaps ask Mitsubishi to confirm that all recalls / updates have been applied?

[old Jack]

The PB/PC Challenger has had several software up dates but I do not think this is the issue. To diagnose this problem the car needs to be connected to a MUT III and have all the sensors involved in the engine control checked for correct operation and calibration. This should be done before replacing any parts or major disassembly as an incorrect signal from a sensor could be causing the problem.

The fact that at RPMs below 1,600 and above 2,000 there is not a reported problem and the problem is worse when the engine and driveline are underload, and in all gears at speeds where the rpm is between 1,600 and 2,000rpm lead me to suspect it might be the variable inlet guide vane control of the turbo charger not working correctly.
Just an educated guess based on info supplied.

OJ.

[Seigried]

I had a similar issue with my manual ns at 2000rpm. A stutter but the revs were not noticeably fluctuating. I ran diesel purge plus through is along with a nulon product to treat diesel microbes. A fuel filter change was done too. My filter had some grey gunk on the inlet side. Havent had the issue come back in 20,000km. Might be worth a shot.

Sent from my SM-G900I using Tapatalk

[AndyP100]

Thanks Guys,
I did get told by Mitsubishi that all recalls are up to date but I hadn't asked about software upgrades. I'll look into it.
I will clean the MAF sensor as I do have a can of that and it should be pretty quick.

Any idea how much Mitsubishi charge for a service and if they would include hooking it up to the tester.
I once had a Holden that I took in for a service and told them it was stalling at idle when the AC kicked in. After the service they told me that it was stalling at idle when the AC kicked in. I asked what they did about it and they said "oh, that's diagnostic rates. We didn't know you wanted us to find out what it was"

[old Jack]

Any idea how much Mitsubishi charge for a service and if they would include hooking it up to the tester.
I once had a Holden that I took in for a service and told them it was stalling at idle when the AC kicked in. After the service they told me that it was stalling at idle when the AC kicked in. I asked what they did about it and they said "oh, that's diagnostic rates. We didn't know you wanted us to find out what it was"

I recall you have only had the car for a few weeks, and since you were told all the recalls were done by the Dealer, can we assume you purchased the car from a Dealer? If so there should be a statutory warranty and they should do the diagnostic check free of charge. If you had to pay for it it would be less than an hours work so $150 or less would be a guess. Service cost will depend on how many kms on the odometer.

OJ.

[littleriver]

The fact that at RPMs below 1,600 and above 2,000 there is not a reported problem and the problem is worse when the engine and driveline are underload, and in all gears at speeds where the rpm is between 1,600 and 2,000rpm lead me to suspect it might be the variable inlet guide vane control of the turbo charger not working correctly.
Just an educated guess based on info supplied.

OJ.

X2

Follow that vacuum hose from diaphragm mechanism on turbo housing to front of motor behind fan area .. there is a valve there that may be faulty ...

...

[AndyP100]

Yes I bought it from a dealer but they are up in the Hunter Valley and I am on the Central Coast and they are not a Mitsubishi dealer. Before I bought it I rang the local Mitsubishi dealer and asked them to look up the VIN number and that's when they said it had no outstanding recalls.
I'll ring them again and ask about a check up.
Yes there is a statuary warranty but it's a couple of hour drive to take it back so it would be good to find out if it as anything major before all that mucking around.