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Okay, I just had the intake manifold replaced two weeks ago. The next day the check engine light came on and idle was twitchy. My scanner said there was a problem with cylinder 1. The shop said it was a leaky vacuum hose which they tightened up. Car has been fine until this morning when the check engine light came on en route to work, and the idle was twitchy. I scanned it again and again it said there was a combustion problem with cylinder 1. The shop said bring it back, maybe they did not tighten the hose enough. They advised me to take surface streets -- it's about 15 miles. Wondering if I should drive back or get a tow?
Okay, I just had the intake manifold replaced two weeks ago. The next day the check engine light came on and idle was twitchy. My scanner said there was a problem with cylinder 1. The shop said it was a leaky vacuum hose which they tightened up. Car has been fine until this morning when the check engine light came on en route to work, and the idle was twitchy. I scanned it again and again it said there was a combustion problem with cylinder 1. The shop said bring it back, maybe they did not tighten the hose enough. They advised me to take surface streets -- it's about 15 miles. Wondering if I should drive back or get a tow?
Here's what the scanner returned:
DTC (2) Count
0632 Combustion misfiring has been detected.
0636 Combustion misfiring of cylinder 1 has been detected.
These codes make no sense to me, there's no letter in front of either one. But the problem definitely feels cylinder related. Did I get a bum scanner??
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
What scanner do you have?
If you have a CEL due to misfires and it is NOT flashing, you can continue to drive until you get to a shop. If it is flashing, you have a more serious problem and should not drive. Of course, being safe is most important.
If you have a CEL due to misfires and it is NOT flashing, you can continue to drive until you get to a shop. If it is flashing, you have a more serious problem and should not drive. Of course, being safe is most important.
I have a Launch Creader Elite 2.0 BBA. Those codes weren’t even in its own DTC lookup function.
The check engine light was yellow and non-blinking but I got a tow back to the shop and bonded with the driver for an hour.
If you have a CEL due to misfires and it is NOT flashing, you can continue to drive until you get to a shop. If it is flashing, you have a more serious problem and should not drive. Of course, being safe is most important.
“Same vacuum hose, this time we replaced it.”
Still wondering about those weird fault codes though. Does MB have MB-only codes and if so where can I find the list?
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Are they "P" codes, such as P0632? If so, then they are NOT misfire codes.
"The trouble code P0632 can be defined as Odometer Not Programmed – ECM/PCM. This fault code would start appearing when the powertrain control module would not be able to read the odometer."
"P0636 means there is an electrical error in the power steering control circuit due to a faulty sensor, faulty CAN bus, or other wiring issues."
I will double check in XENTRY to see if the definitions are different.
EDIT: 0632 and 0636 do NOT show up under the ECU. The only misfire codes are P030X.
CORRECTION: 0632 AND 0636 DO show up exactly as shown. I was looking at codes for the ECU in my SL400. When I switched to my C350, they were there. Also, no "P" prefix.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
CORRECTION: 0632 AND 0636 DO show up exactly as shown. I was looking at codes for the ECU in my SL400. When I switched to my C350, they were there. Also, no "P" prefix.
Are they "P" codes, such as P0632? If so, then they are NOT misfire codes.
"The trouble code P0632 can be defined as Odometer Not Programmed – ECM/PCM. This fault code would start appearing when the powertrain control module would not be able to read the odometer."
"P0636 means there is an electrical error in the power steering control circuit due to a faulty sensor, faulty CAN bus, or other wiring issues."
I will double check in XENTRY to see if the definitions are different.
EDIT: 0632 and 0636 do NOT show up under the ECU. The only misfire codes are P030X.
CORRECTION: 0632 AND 0636 DO show up exactly as shown. I was looking at codes for the ECU in my SL400. When I switched to my C350, they were there. Also, no "P" prefix.
The launch scanner has the codes as above without a P — however, next to each number in red letters the device says it’s a cylinder combustion issue. And the engine was really twitchy and my mechanic said he replaced a vacuum hose and now the problem seems to be gone. So I think possibly the scanner software is buggy: right issue, wrong numbers. I may return this scanner and get a different brand.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Originally Posted by Aging C300
The launch scanner has the codes as above without a P — however, next to each number in red letters the device says it’s a cylinder combustion issue. And the engine was really twitchy and my mechanic said he replaced a vacuum hose and now the problem seems to be gone. So I think possibly the scanner software is buggy: right issue, wrong numbers. I may return this scanner and get a different brand.
Actually, your scanner is correct. See my other posts. 0632 and 0636 are correct as displayed without the "P". They see to be unique to ME97 ECU, versus the MED177 ECU in other cars.
Actually, your scanner is correct. See my other posts. 0632 and 0636 are correct as displayed without the "P". They see to be unique to ME97 ECU, versus the MED177 ECU in other cars.
Thanks, I found a pdf of the ME97 fault codes on the forum and feel much happier with my Launch.
Actually, your scanner is correct. See my other posts. 0632 and 0636 are correct as displayed without the "P". They see to be unique to ME97 ECU, versus the MED177 ECU in other cars.
Okay so the CEL came on again on the freeway and when I got off I felt the same twitchy idle. Turned car off and on, steady idle. Scanned and codes came back:
Took surface streets on way home, stayed at about 35 mph. The CEL did not come on until the last leg when I have to go up a fairly steep hill. The minute I pressed the accelerator to climb the hill the CEL came back on.
What Is my mechanic missing here? This problem only surfaced after new intake manifold installation. Mechanic says a faulty vaccum hose has been replaced. That did not fix the issue.
Last edited by Aging C300; 02-25-2024 at 03:24 PM.
Okay so the CEL came on again on the freeway and when I got off I felt the same twitchy idle. Turned car off and on, steady idle. Scanned and codes came back:
Took surface streets on way home, stayed at about 35 mph. The CEL did not come on until the last leg when I have to go up a fairly steep hill. The minute I pressed the accelerator to climb the hill the CEL came back on.
What Is my mechanic missing here? This problem only surfaced after new intake manifold installation. Mechanic says a faulty vaccum hose has been replaced. That did not fix the issue.
The active misfiring curse is back.
It seems logical because the engine ECU is missing combustion feedback. your Lambda input is flagged bad by ECU
Have a reading of what it says above your misfire faults.
The ECU is disatisfied with the lambda circuit. What is really wrong: old sensor or chassis harness (/pin /oil)
ECU also flags an "intake air leak" which may just be standard way to complain for a lean engine.
It seems logical because the engine ECU is missing combustion feedback. your Lambda input is flagged bad by ECU
Have a reading of what it says above your misfire faults.
The ECU is disatisfied with the lambda circuit. What is really wrong: old sensor or chassis harness (/pin /oil)
ECU also flags an "intake air leak" which may just be standard way to complain for a lean engine.
I know correlation does not imply causation but this all started with the replaced intake manifold! And it feels weird that it’s just cylinder #1. At least they love me at Enterprise.
I know correlation does not imply causation but this all started with the replaced intake manifold!
And it feels weird that it’s just cylinder #1.
At least they love me at Enterprise.
I see... the Xentry screencap is not related to your engine.
Back to the intake manifold repair being a source of air leak.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
The xentry screen cap is using entry in simulation mode where you can pick and choose which faults to trigger, and then review the tests to be used to troubleshoot the problem. For codes 0632 and 0636, the test is to run a compression test.
First off, thanks to all for your comments and advice.
The shop told me since the vacuum hoses have been checked and nothing turned up bad they swapped ignition coils and tested sparkplugs which are good and still get the cylinder 1 misfire code. They said when they replaced the intake manifold they redid the fuel injector seals so they are going to make sure they are okay. Then I guess the next step is checking the fuel injector itself -- I hope it is something that can be cleaned and tested before having to pony up for a replacement. Not sure where the oxygen sensor goes in the order of potential issues to check. Again, we are at 134K and hoping to make it to 160!
Meanwhile, some "data" that may help: while driving calmly on surface streets the CEL does not come on. The magic number is 3000 RPM -- that's when the CEL pops on. If you turn the ignition off and restart -- no CEL until 3000 RPM reached by revving, accelerating while merging or going up a hill.
Tech said it was an ignition coil after all. Seems to be running great now. Wondering if I should replace the remaining five coils (all original). Plugs were replaced at 113k, now at 134k.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
But you said they swapped coils and the misfires remained on cylinder 1. Either they didn't actually swap the coils or it was something else they should have done and told you it was the coil. The plugs should be good for 65,000 miles (or whatever is recommended for your car).
But you said they swapped coils and the misfires remained on cylinder 1. Either they didn't actually swap the coils or it was something else they should have done and told you it was the coil. The plugs should be good for 65,000 miles (or whatever is recommended for your car).
It is very odd. Does anyone replace all the ignition coils at once or wait for a fail?
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
I recently replaced all of my coils in my 2014 C350 when I changed the plugs at around 124,000 miles, as a precaution. I kept the old ones, which seemed perfectly good, as backups. My wife is the primary driver of that car.
02-23-2024, 12:41 PM
