[5th Gen : 08+]: 2017 Caravan misfire, no code, mediocre compression test
#1
2017 Caravan misfire, no code, mediocre compression test
Noticed the engine missing two weeks ago, no check engine light and no stored codes. 63K, so slightly over the warranty.
I was luckily able to pull a pending code for Cylinder 2 Misfire, which I found out is covered under an extended warranty for earlier models(bad head), but not mine.
I replaced the spark plugs and swapped coil pack from the #2 cylinder and no change.
We put some Heet in the tank, because we thought maybe we had water in our gas. It seemed to improve for a few days, but the misfire returned. We ran another tank of Heet and no improvement.
I did a compression test and got some weird results at first. I got 120psi on cyl2 then 90 on the next two. After "standardizing" my testing I was getting 150psi on each cylinder, but engine wasn't completely warm by that point. After reassembling everything I took it for a drive and there was no obvious misfires, but there were some weird hesitations here and there.
We're going on a small trip tomorrow and I fully expect the misfire to return.
It's really disappointing, because we had a 2006 SXT that we took from 33K to 238K and sold to an excited buyer that expected to hit 300K based off past experience.
If it misfires again I fully plan to take it in for diagnostics and hope for the best. My pessimism expects the worse.
I was luckily able to pull a pending code for Cylinder 2 Misfire, which I found out is covered under an extended warranty for earlier models(bad head), but not mine.
I replaced the spark plugs and swapped coil pack from the #2 cylinder and no change.
We put some Heet in the tank, because we thought maybe we had water in our gas. It seemed to improve for a few days, but the misfire returned. We ran another tank of Heet and no improvement.
I did a compression test and got some weird results at first. I got 120psi on cyl2 then 90 on the next two. After "standardizing" my testing I was getting 150psi on each cylinder, but engine wasn't completely warm by that point. After reassembling everything I took it for a drive and there was no obvious misfires, but there were some weird hesitations here and there.
We're going on a small trip tomorrow and I fully expect the misfire to return.
It's really disappointing, because we had a 2006 SXT that we took from 33K to 238K and sold to an excited buyer that expected to hit 300K based off past experience.
If it misfires again I fully plan to take it in for diagnostics and hope for the best. My pessimism expects the worse.
#3
Could have been a fuel injector that was plugged, But if the compression was 90 psi. I'm thinking valves or rockers or camshaft. On your next compression test, do a wet test and see if the compression comes up. If if it does, that sounds like a rings or piston is leaking.
I just have a cheap Bluetooth ODBII scanner. I'm guessing Dodge or really any decent shop will have something better. The only code that ever got stored was a limp code P2110 that went away after the first Heet treatment.
I would suspect bad gas more if we weren't getting gas from so many different sources and hadn't done like 3 Heet treatments already.
#5
Idle RPM yes. In Park as well as in D.
Low RPM more so,1500-2000rpm. Especially under load/incline.
Higher RPM seems to mask the issue, but feels like power is down.
Since I live in Phoenix and have to climb elevation to get anywhere, I have been using the manual shifting more with this issue than ever.
Low RPM more so,1500-2000rpm. Especially under load/incline.
Higher RPM seems to mask the issue, but feels like power is down.
Since I live in Phoenix and have to climb elevation to get anywhere, I have been using the manual shifting more with this issue than ever.
Last edited by cbeers; 08-02-2021 at 11:50 PM.