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-   -   29CC, 29CD despite new plugs and coil pack (https://xoutpost.com/bmw-sav-forums/x5-e53-forum/108565-29cc-29cd-despite-new-plugs-coil-pack.html)

AussieXer 07-31-2018 04:29 AM

29CC, 29CD despite new plugs and coil pack
 
I have an annoying hesitation/faltering when I accelerate from rest or from a slow speed. When cold it is accompanied by a flashing engine light which usually goes off after flashing 3 to 8 times. Other than that the car seems to run fine. My Foxwell scanner shows two relevant codes when this occurs: "29CC/not present, DME Combustion misfires several cylinders" and "29CD/not present, DME Combustion misfires cylinder 1". These faults reoccur after I clear them. I have replaced all the plugs and today replaced the coil pack on cylinder 1 but it is still happening. My local mechanic says he thought it could be an air leak. Any suggestions would be appreciated.

wpoll 07-31-2018 06:17 AM

I see you on the 4.8iS registry, so is it safe to assume it's the 4.8iS you have the problem with? :dunno:

'Cause someone's gonna ask... ;)

wpoll 07-31-2018 06:19 AM

And because I'm not that familiar with the V8s, I'll ask... how protected is the wiring to the coils on the V8? Any chance this issue is caused by some chaffed wires on the loom(s) feeding the coils?

AussieXer 07-31-2018 07:23 AM

Thanks for the response Wayne. Yes you are right it is a 4.8is. I will check see if I can check the wiring to the coils.

AussieXer 12-28-2018 12:02 AM

Taken the car (4.8is) to a dealer and an indie. One wants more time to swap injectors and the other says it is eccentric shafts and/or intermediate levers and that the parts alone would cost about $8500. Have connected car to INPA and there are no outstanding readings for cylinder 1 although I have not checked injectors yet. Camshaft position for both banks was towards top of range (120.00) and air mass was 23.5 kg/h (max 25). Vanos readings were fairly consistent across both banks. “Adjustment angle” for 1-4 bank was 0.00 and for 1-5 bank was 2.00. Appreciate any suggestions. No sign of chaffed wiring.

AussieXer 12-28-2018 12:10 AM

When I changed the plugs I did notice that the number 1 plug was oiled and after I changed the plugs it looked like the new plug was heading the same way.

StephenVA 12-28-2018 06:58 AM

Is the #1 plug oil fouled or wet fouling by a faulty injector? A pressure test on the fuel system at rest will expose a leaking injector.
Question: Does this vehicle smoke when warming up or at an idle for more than a few secs? Does it puff oil smoke on idle to hard acceleration? Smoke after idling for 10-15 mins? The last one is valve seals....

Time to do a compression test on a few cyls to determine internal engine health. Oil splashing fouling maybe your symposium to a larger issue. Once warmed up and the oil burned off, the engine runs normal? Inserting a bore scope through the plug hole with the piston all the way down in the cyl will expose the cyl walls. Look for vertical scaring in the walls for busted rings etc. Engine ever run way too hot in the past?

If compression is good, look for valve stem seals cracking and wear. A compression test does not expose this issue only a visual will.

AussieXer 01-24-2019 01:24 AM

Looks to be oil fouled. Did a leak down test and seems ok. No sign of smoking. Did a compression test and looks ok. Used a bore scope and couldn't see anything abnormal but the picture wasn't that clear.
Postscript: Looks like I might have fixed the problem. Removed the right hand vanos solenoids and flushed them out with carby cleaner. I didn't realise the mesh filters were so fine. Very easy to block. Looked clean but looks like they weren't. Car runs a lot better and no sign of any warning lights or errors generated. There may be a slight hesitation on hard acceleration but the car is quite drivable.

AussieXer 02-05-2019 12:51 AM

I thought I would do an error check to see if 29cc and 29cd were cleared. I found that they were cleared but had been replaced by 2A63 and 2A64. I checked on these two errors and finally found out they were caused by me forgetting to connect the electrical connections to the solenoids. I connected them which cleared 2A63 and 2A64 but the original error codes(29CC and 29CD) are back again along with the misfire/faltering. Back to the drawing board. At least I now know I can improve the running of the car by disconnecting the vanos solenoids. Is this conclusive evidence that they are faulty?

AussieXer 02-20-2019 07:22 AM

Think I may have solved the problem. Replaced all 8 “o” rings on the four solenoid valves. Total cost about $20 AUD. The error messages went away and the car is running a lot better. There may be a slight hesitation but I will keep working on that.

AussieXer 02-24-2019 01:58 AM

Spoke too soon. Next day 29Cc and 29CD back again. Once when cold and later when hot. A “misfire” is probably not a good description, it is more like a shuddering then the CEL flashes and sometimes goes out but if it stays on the car runs poorly which I assume is “limp home”. If I use my scanner to clear the fault the car will instantly run better. I now carry the scanner in the car at all times. As usual any suggestions would be welcome. In case you are new to the thread here is a summary of what I have done:
Swapped plugs, replaced plugs
Swapped coils, replaced coils
Swapped injectors
Swapped Vanos solenoids, replaced Vanos seals (x8)

mr_robot 02-24-2019 11:36 AM

When you say swapped vanos solenoids, you mean you tried new replacements?

Mine misfires, again not really misfiring more like it's retarded timing on the even number cylinders on both banks. Have done all the same swaps and tests as you.

But mine is only on cold starts, the cel sometimes only blinks and goes away or sometimes it blinks and stays on but otherwise shortly after the car drives perfectly regardless of clearing the codes or not.

jopecasa 02-24-2019 01:22 PM

I can see you've swapped a few things but still having on-going issue.

Three things to check and/or replace
1. Throttle pedal
2. Brake servo vacuum pump and hose.
3. Oxygen sensors x4

I had minor hesitations before but the O2 sensors was causing it.

mr_robot 02-24-2019 02:57 PM

For me it's only on cold start so it is on open loop so it's not using the o2 sensors as far as I know.

AussieXer 02-25-2019 02:32 AM

When I say “swapped” I mean swapped position to see if the error code changed but it didn’t, still 29cc and 29cd (cylinder 1 misfire, multiple misfires). Mine idles fine but is definitely more susceptible to misfire when cold although yesterday did it when hot. I will check out the throttle pedal, oxygen sensors and brake servo and hose. I did replace both the “o” rings on the brake vacuum pump to stop an oil leak but no change. I thought an oxygen sensor fault would produce and unique type of fault code.

AussieXer 02-25-2019 07:30 AM

Is it possible that a loose connection on the hose from the purge valve could cause the symptoms I am experiencing (see picture)?

https://www.dropbox.com/s/qfzxcvbh7t...82202.jpg?dl=0

AussieXer 02-26-2019 12:19 AM

When investigating with my Foxwell NT510 scanner I found some “active” tests you could do which I assumed enabled you to turn various settings/solenoids on and off. I found some tests you could do on Vanos solenoids. When I activated and inactivated the inlet solenoid nothing much happened. When I “activated” the exhaust solenoid I thought there may have been a slight increase in revs but nothing more but when I “deactivated” it the engine immediately stalled. I repeated this procedure several times and it had the same effect?? I still suspect Vanos solenoids to be the culprit. I have ordered four replacements.

mr_robot 02-26-2019 05:39 PM

I had left the CEL on for couple of days as I got tired of clearing it constantly but today decided to take a look and P1434 popped up for the first time ever for DTML pump leak.

Might be a false reading but maybe all of my changes finally triggered it and that's where I have a vacuum leak maybe?

Just posting it up. Will have to see if it comes up again.

mr_robot 03-04-2019 09:16 PM

Changed my vanos seals, all 4 small and big o-rings. Still get cyl 2, 4, 6,&8 misfires....sad

AussieXer 03-04-2019 11:45 PM

New solenoids arrived today but have not fitted them yet. Have ordered a replacement purge valve and hose but they are coming from Latvia so might take a while. I have found that if I put the gearbox in Sport mode I can avoid the problem but the car revs pretty hard and no doubt the fuel consumption suffers.

AussieXer 03-31-2019 11:12 PM

Replaced the purge valve hose but that made no difference but given the damage I suppose it needed to be replaced. I found that when I disconnected the input solenoid on the right hand bank the 29cc and 29cd errors went away and the car ran really well without a misfire. I felt sure that this meant that the solenoid was faulty but when I replaced it with a new one the misfire, CEL and error codes (29cc and 29cd) reoccurred. When I disconnected the solenoid I got a solenoid disconnected error code but it did not generate a CEL.

upallnight 04-01-2019 01:06 PM

Quote:

Originally Posted by AussieXer (Post 1158825)
Replaced the purge valve hose but that made no difference but given the damage I suppose it needed to be replaced. I found that when I disconnected the input solenoid on the right hand bank the 29cc and 29cd errors went away and the car ran really well without a misfire. I felt sure that this meant that the solenoid was faulty but when I replaced it with a new one the misfire, CEL and error codes (29cc and 29cd) reoccurred. When I disconnected the solenoid I got a solenoid disconnected error code but it did not generate a CEL.

You need to get the vanos timing setup tool and check the timing. Could be that your timing is off.

https://www.youtube.com/watch?v=eTscmuiGuyg

bcredliner 04-01-2019 04:03 PM

Troubleshoot, troubleshoot, troubleshoot.

If the engine runs smooth at an idle I would expect all cylinders are functioning normal at an idle but not under a load. Under load the DME could be changing settings because of cylinder one not functioning at reading DME expects from it. I would be sure I have thoroughly troubleshooted cylinder 1 before going on to problems that would impact multiple cylinders. Cylinder 1 injector might be the problem. Might be able to verify by reading the plug after putting load on the engine several times and not letting it idle after doing so. Sometimes all you need to do is add a bottle of Techron to a full tank of quality gas and the problem will fix itself. Potential problem with the injector was mentioned earlier and how to test for bad injector but don't see where that has been addressed. If it turns out to be a bad injector I would have then all 'rebuilt'. One is often an indication the others are not far behind. I think I would do a smoke test also.

mr_robot 04-01-2019 06:07 PM

Have you checked if your vaccum pump is leaking? I recently noticed a a very small oil leak right under it. Could be a vacuum leak as well. I plan on changing mine soon, the new o-rings came in.

mr_robot 04-18-2019 05:28 PM

Any updates?

AussieXer 04-19-2019 12:35 AM

For the last three weeks I have been running the car with the inlet solenoid on the right hand bank disconnected. Except for a slight hesitation under heavy acceleration the car is running fine. The 29cc and 29cd error codes have disappeared although have been replaced by a 2A63 (solenoid disconnected) error but this does not seem to generate a CEL. The car idles fine, no smoke. Brings up an interesting philosophical point. At what stage do you walk away?
Seeing I have bought them I think the next thing I will do will be to replace all the solenoids. Not sure why just replacing just one of the inlet solenoids makes such a difference. Is the solenoid on the left bank still operating?
Once I have done that I will reconnect all the solenoids and see if the misfire (and associated error codes and CEL return). From past experience I think they will.

mr_robot 04-24-2019 07:06 AM

I think I have fixed mine finally. 4 days with no flashing cel.

Although my plugs were only a year old done by the previous owner, after replacing everything possible just like you have I decided to try two new coils on the cyl 1 & 2 which were the only consistent misfires codes I got from random misfires.

Since replacing those two it's been running good.

Maybe they were faulty or went bad when the valve stem seals were leaking fouling the plugs.

Through my research the coils are pretty sensitive and even dropping them on the floor can damage them.

fishhouse4 09-01-2019 10:51 PM

Quote:

Originally Posted by AussieXer (Post 1160337)
For the last three weeks I have been running the car with the inlet solenoid on the right hand bank disconnected. Except for a slight hesitation under heavy acceleration the car is running fine. The 29cc and 29cd error codes have disappeared although have been replaced by a 2A63 (solenoid disconnected) error but this does not seem to generate a CEL. The car idles fine, no smoke. Brings up an interesting philosophical point. At what stage do you walk away?
Seeing I have bought them I think the next thing I will do will be to replace all the solenoids. Not sure why just replacing just one of the inlet solenoids makes such a difference. Is the solenoid on the left bank still operating?
Once I have done that I will reconnect all the solenoids and see if the misfire (and associated error codes and CEL return). From past experience I think they will.

Did you ever make sense of your issue?



Quote:

Originally Posted by mr_robot (Post 1160747)
I think I have fixed mine finally. 4 days with no flashing cel.

Although my plugs were only a year old done by the previous owner, after replacing everything possible just like you have I decided to try two new coils on the cyl 1 & 2 which were the only consistent misfires codes I got from random misfires.

Since replacing those two it's been running good.

Maybe they were faulty or went bad when the valve stem seals were leaking fouling the plugs.

Through my research the coils are pretty sensitive and even dropping them on the floor can damage them.

Did this officially fix yours?

I'm having nearly identical issue recently. Rough idle, hesitation on slow accretion, runs better when warmed up, seems fine at higher RPM. Multiple cylinder misfire codes.


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