Survey- For those with misfire issues

[25rawls]

@speedracer0481
date of mfr 7-19
MDH 072310

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[black_gladiator_TX]

I think you meant to post your build date as 10/26/19 at 8 p.m maybe? MDH reads as month date hour.

good catch! I'll fix that.

 

[Gijohn96]

I am so beside myself right now. After looking at the timing and determining it was not the problem, my dealer did the compression test. As stated in my earlier post, the 2,4,6 bank was more than 10% less that the 1,3,5. Yesterday the service manager said he would push for a new engine.

Today I went to swap rental vehicles because a Nissan versa does not work for me and my truck was out of the shop and parked by the door. When I asked the status, the rep said that they were installing the new software update as directed by the "STAR TEAM" and would drive it tomorrow.

My response was that no amount of software fixes bad compression. He agreed, shrugged his shoulders, and said "we will let you know."

What the actual F&@K!

 

[WvJeeper304]

I am so beside myself right now. After looking at the timing and determining it was not the problem, my dealer did the compression test. As stated in my earlier post, the 2,4,6 bank was more than 10% less that the 1,3,5. Yesterday the service manager said he would push for a new engine.

Today I went to swap rental vehicles because a Nissan versa does not work for me and my truck was out of the shop and parked by the door. When I asked the status, the rep said that they were installing the new software update as directed by the "STAR TEAM" and would drive it tomorrow.

My response was that no amount of software fixes bad compression. He agreed, shrugged his shoulders, and said "we will let you know."

What the actual F&@K!

I’m in a similar situation. Left side 2,4,6 145,150,150 was off compared to the right side 1,3,5 160,165,167. I was told there had to be a timing issue somewhere and this is why they had them pull the oil control valves, VVT and cam phaser. I’m not a mechanic by any means but, that’s a 13.2% variance between highest and lowest compression.

 

[Gijohn96]

If it was a timing issue, wouldn't it happen all the time, not just on cold start?

 

[ShadowsPapa]

If it was a timing issue, wouldn't it happen all the time, not just on cold start?

No.

 

[Gijohn96]

No.

I knowledge of internal combustion engines is not great. Do you think software can fix what we are experiencing or do you think there was an issue with manufacturing?

Nuts, bolts, valves, and bearings I have agreat grasp of. This is out if my league of understanding.

 

[ShadowsPapa]

I knowledge of internal combustion engines is not great. Do you think software can fix what we are experiencing or do you think there was an issue with manufacturing?

Nuts, bolts, valves, and bearings I have agreat grasp of. This is out if my league of understanding.

Here's why things can be different when cold, than when warm.
When you first start - a "cold start", the engine runs in open loop mode - before the oxygen sensors come up to operating temperature. There isn't the same feedback the PCM gets later.
Basically, the fuel is being metered with MAP/MAF as the primary input.
(MAP - Manifold Absolute Pressure; MAF - Mass Air Flow)
Once the engine has warmed a bit - the O2 sensor is warm and fully operational, it goes into close-loop.
Ignition timing is impacted - since the late 90s, the PCM handles each cylinder individually for ignition, unlike a single coil through a distributor where the timing was handled for all.
We also have valve timing that's handled by the PCM - and through the cam shaft "phasers" - sort of like the centrifugal timing mechanism used on some racing cams decades ago (60s). Valve timing - even valve lift, varies with speed, load and other factors.
Until things warm up, the PCM doesn't have the input needed to handle things like it does once warm.
This is one reason some of these engine issues are actually fixed by new software.
I still believe that when checking the engines physically, they need to run leak-down tests as compression checks can be skewed by valve system issues.

 

[Sanders1976]

We picked up the gladiator yesterday evening after 47 days in the shop. They had to put a new cam shaft and head on the left side. Service manager said the cam had flat lobes on it and the valve train was messed up. He did mention that Chrysler believes the heat treating process on the cam lobes was incorrect causing them to be too soft. Don’t know if that is typical Chrysler spit balling or legitimate. They installed the new PCM update as well. We put about 50 miles on it last night, and so far so good.

 

[ShadowsPapa]

We picked up the gladiator yesterday evening after 47 days in the shop. They had to put a new cam shaft and head on the left side. Service manager said the cam had flat lobes on it and the valve train was messed up. He did mention that Chrysler believes the heat treating process on the cam lobes was incorrect causing them to be too soft. Don’t know if that is typical Chrysler spit balling or legitimate. They installed the new PCM update as well. We put about 50 miles on it last night, and so far so good.

"Flat cam lobes" CAN cause low compression. It's the same as when in the old days you didn't hold the choke and throttle wide open during a compression test - air not getting in means you have a slight vacuum instead of a chamber full of air to compress - thus, lower compression numbers. If it's not filled with air, then the computer sees it's running rich and cuts the injector down, resulting in a poor burn at lower compression than the others - the feel of a miss.

I have wondered for a few weeks now if some of the poor compression numbers could be cam related. I've seen engines backfire due to wiped cam lobes - but those were carbureted engines.

 

[speedracer0481]

Got the battery changed and latest TSB done and as soon as I pulled out of the dealership, Check engine light and Start stop light was back ON but both together. The dealer plugged in and said earlier there were multiple codes but this time it’s only P0300. They will look into it deeper tomorrow

Can you please submit your build information? Thanks.

 

[JeepCares]

Hello everyone,

We know other customers have posted out about TSB 18-053-20 REV. A, but we wanted to follow up on this topic as well. Details from the TSB posted below that may assist you with getting your concerns remedied. Please let us now if you need any additional support while you are working with your dealers!

"SUBJECT:
Flash: Powertrain Control Module (PCM) Updates

OVERVIEW:
This bulletin involves reprogramming the PCM with the latest available software.

MODELS:
2020 (JT) Jeep Gladiator
NOTE: This bulletin applies to vehicles within the following markets/countries: North
America.
NOTE: This bulletin applies to vehicles built on or before July 09, 2020 (MDH 0709XX)
equipped with a 3.6L V6 24V VVT Engine Up Grade I W/ESS (Sales Code ERC).

SYMPTOM/CONDITION:
Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further
investigation the technician may find one or more of the following DTCs.
• P0300 - Multiple Cylinder Misfire.
• P258B - Electronic Vacuum Pump Performance.
• C1252-92 - Vacuum Pump Control Circuit - Performance Or Incorrect Operation.
• P0456 - EVAP System Small Leak.
NOTE: If DTC P0456 is present use the wiTECH Small Leak Verification test (SLVT) to
determine if a leak is present in the system.
• P1404 - EGR Close Position Performance.
• P1206 - Fuel Pump Control Module Open Circuit To Fuel Pump.
Upon diagnosing the vehicle the technician may find DTC P1206 set before flashing the vehicle, the
correct DTC will now be P025A - Fuel Pump Module Control Circuit Open after the software update.

In addition the customer may notice one or more of the following:
• The Anti-Lock Brake System (ABS) light illuminates.
• The customer may notice an ability to shift into 1st gear at an unsafe speed (MTX Only).
• Cluster displays 9Autopark Engaged9 even when autopark is no longer active."

Julie
JeepCares

 

[Gijohn96]

Hello everyone,

We know other customers have posted out about TSB 18-053-20 REV. A, but we wanted to follow up on this topic as well. Details from the TSB posted below that may assist you with getting your concerns remedied. Please let us now if you need any additional support while you are working with your dealers!

"SUBJECT:
Flash: Powertrain Control Module (PCM) Updates

OVERVIEW:
This bulletin involves reprogramming the PCM with the latest available software.

MODELS:
2020 (JT) Jeep Gladiator
NOTE: This bulletin applies to vehicles within the following markets/countries: North
America.
NOTE: This bulletin applies to vehicles built on or before July 09, 2020 (MDH 0709XX)
equipped with a 3.6L V6 24V VVT Engine Up Grade I W/ESS (Sales Code ERC).

SYMPTOM/CONDITION:
Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further
investigation the technician may find one or more of the following DTCs.
• P0300 - Multiple Cylinder Misfire.
• P258B - Electronic Vacuum Pump Performance.
• C1252-92 - Vacuum Pump Control Circuit - Performance Or Incorrect Operation.
• P0456 - EVAP System Small Leak.
NOTE: If DTC P0456 is present use the wiTECH Small Leak Verification test (SLVT) to
determine if a leak is present in the system.
• P1404 - EGR Close Position Performance.
• P1206 - Fuel Pump Control Module Open Circuit To Fuel Pump.
Upon diagnosing the vehicle the technician may find DTC P1206 set before flashing the vehicle, the
correct DTC will now be P025A - Fuel Pump Module Control Circuit Open after the software update.

In addition the customer may notice one or more of the following:
• The Anti-Lock Brake System (ABS) light illuminates.
• The customer may notice an ability to shift into 1st gear at an unsafe speed (MTX Only).
• Cluster displays 9Autopark Engaged9 even when autopark is no longer active."

Julie
JeepCares

As of this moment, my truck has had both PCM updates, engine torn down to access timing chain, found low compression on 2,4,6. It was then put back together for the second PCM UPDATE.

Now the STAR team asked the dealership to tear down the engine again to see how stiff the lifters are. My dealership has refused and is requesting that the regional rep replace my engine or truck completely.

Since I am at day 25 without a vehicle on day 39 of ownership, I feel that your corporate team is failing miserably.

 

[dgulia]

I can’t submit my info because my vehicle is in the shop couple of days after I purchased it

 

[dgulia]

Hello everyone,

We know other customers have posted out about TSB 18-053-20 REV. A, but we wanted to follow up on this topic as well. Details from the TSB posted below that may assist you with getting your concerns remedied. Please let us now if you need any additional support while you are working with your dealers!

"SUBJECT:
Flash: Powertrain Control Module (PCM) Updates

OVERVIEW:
This bulletin involves reprogramming the PCM with the latest available software.

MODELS:
2020 (JT) Jeep Gladiator
NOTE: This bulletin applies to vehicles within the following markets/countries: North
America.
NOTE: This bulletin applies to vehicles built on or before July 09, 2020 (MDH 0709XX)
equipped with a 3.6L V6 24V VVT Engine Up Grade I W/ESS (Sales Code ERC).

SYMPTOM/CONDITION:
Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further
investigation the technician may find one or more of the following DTCs.
• P0300 - Multiple Cylinder Misfire.
• P258B - Electronic Vacuum Pump Performance.
• C1252-92 - Vacuum Pump Control Circuit - Performance Or Incorrect Operation.
• P0456 - EVAP System Small Leak.
NOTE: If DTC P0456 is present use the wiTECH Small Leak Verification test (SLVT) to
determine if a leak is present in the system.
• P1404 - EGR Close Position Performance.
• P1206 - Fuel Pump Control Module Open Circuit To Fuel Pump.
Upon diagnosing the vehicle the technician may find DTC P1206 set before flashing the vehicle, the
correct DTC will now be P025A - Fuel Pump Module Control Circuit Open after the software update.

In addition the customer may notice one or more of the following:
• The Anti-Lock Brake System (ABS) light illuminates.
• The customer may notice an ability to shift into 1st gear at an unsafe speed (MTX Only).
• Cluster displays 9Autopark Engaged9 even when autopark is no longer active."

Julie
JeepCares

Thanks for posting but it doesn’t work
There is an issue with the engine assembly

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