Engine Miss + SES = CPS? - Page 3 - BMW M5 Forum and M6 Forums
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post #21 of 59 Old 17th March 2005, 03:41 PM
Greco
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Re: Engine Miss + SES = CPS?

Don't know if its an issue with the S62, but M62 wear out the valve cover gaskets which can cause oil to leak into the spark plug chamber. I'd also check for oil on the plug or the end of the coil as well. I've had misfires due to oil in one of the chambers before.

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post #22 of 59 Old 17th March 2005, 05:56 PM
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Re: Engine Miss + SES = CPS?

Quote:
Originally Posted by 2003 M5!!!
What is an exhaust CPS code? What part is being replaced?

My last code was exhaust efficiency . . . whatever that means I think I have had 3 on and off SESs in the last 2 years. I had a real problem before that -- once I had my x-pipe installed.
I recently had an exhaust efficiency code. Dealer says bad cat, to be replaced under warranty. The code is intermittant, (SES gone for the last 2 weeks until this morning). Might want to have the cats checked.
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post #23 of 59 Old 17th March 2005, 06:02 PM Thread Starter
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Re: Engine Miss + SES = CPS?

Quote:
Originally Posted by Greco
Don't know if its an issue with the S62, but M62 wear out the valve cover gaskets which can cause oil to leak into the spark plug chamber. I'd also check for oil on the plug or the end of the coil as well. I've had misfires due to oil in one of the chambers before.
This can be an issue on the s62 as well. I've had recent valve cover gaskets, but you never know. Replacing the plugs will of course let me make sure there's no oil in the recesses. I also had this happen on a previous e34 525.
Mike

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post #24 of 59 Old 18th March 2005, 05:21 AM
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Re: Engine Miss + SES = CPS?

Mike let us know what the problem was, if you find it.

Joe

Last edited by hudson; 18th March 2005 at 05:22 AM.
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post #25 of 59 Old 18th March 2005, 07:41 AM Thread Starter
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Re: Engine Miss + SES = CPS?

Quote:
Originally Posted by hudson
Mike let us know what the problem was, if you find it.

Joe
The problem has not occured since the track event, where it happened twice, throwing a 'misfire with cylinder shutdown' code on two occasions. (the bmw gt1 computer shows the codes were set off at 4420 rpm, 74% load, 99C coolant temp, 99,642km, interesting data! and the fault occured once on cyl 8 and twice on cyl 1). They cleared the faults and said come back if it happens again! Day to day, the car is running just fine. I'm thinking i might put some new coils and plugs in, just for the heck of it, seems like a reasonable time for ignition solution plasma coils...
Mike

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post #26 of 59 Old 31st March 2005, 08:13 AM
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Re: Engine Miss + SES = CPS?

As mentioned above, I have had some of the similar problems as you have. I have changed two CPS (bank 2), valve cover gaskets and plugs, still problems when cold and when driving it hard. The first couple of minutes after starting, it's running really rough. And it kind of hasitates when trying to drive it hard. Sometimes it goes into linkmode as well when pressing it hard in 2nd and 3rd gear.

That was until Yesterday. I ordered two MAFs from Pacific BMW in California for $253 ea (plus $130 UPS shipping!) and got them Yesterday. I installed them, no rough cold start and I finally have a BEAST!!

Thanks everyone on this board, most useful board I have ever used. Without it, I would have spent a lot of money at a BMW place and they would probably not have fixed it anyway (no MAF codes).


Quote:
Originally Posted by mottati
The problem has not occured since the track event, where it happened twice, throwing a 'misfire with cylinder shutdown' code on two occasions. (the bmw gt1 computer shows the codes were set off at 4420 rpm, 74% load, 99C coolant temp, 99,642km, interesting data! and the fault occured once on cyl 8 and twice on cyl 1). They cleared the faults and said come back if it happens again! Day to day, the car is running just fine. I'm thinking i might put some new coils and plugs in, just for the heck of it, seems like a reasonable time for ignition solution plasma coils...
Mike
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post #27 of 59 Old 1st August 2005, 07:13 AM Thread Starter
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Re: Engine Miss + SES = CPS?

Bringing back this thread i started a few months ago. I replaced my plugs shortly after this incident with denso irridium plugs (hold on...) and ignition solutions plasma coils. I honestly notice no realy difference in performance with these mods, although my fuel economy did improve by 1.2mpg according to the obc.

I did a trackday at buttonwillow, no misses or issues, problem solved... but wait, it's not.

Last night, bedding in new pads and rotors, temp in the mid 70'sF. After my third slowdown, back in second, moderate acceleration, at around 4k rpm, misfire, ses light... ****. shut off, restart all is fine, and i drive the heck out of the car for the next 15 minutes, wot, 7k rpm, etc trying to get it to happen again, it doesn't. Peak reader says cyl 1 misfire.

I pulled the plugs today, looked carefully at the wiring, boots etc. All looked perfect. Because of the tales of horror and woe regarding non-oe plugs, i reinstalled a set of 5k mile old bmw/ngks, just for the heck of it. Interestingly, throttle responce seems a little sharper with the oe plugs, vs the irridiums.

Ok, the real reason i brought this back up was this other thread:
Engine problem

Read post number 8, by Pong. He had a misfire associated with brake pad bedding. My initial misfires at sears point were consistantly right after turn 7, a heavy braking hairpin...
What could cause a misfire after braking?
Mike

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post #28 of 59 Old 1st August 2005, 08:01 AM
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Re: Engine Miss + SES = CPS?

You could very well be onto something here. How about if braking long and hard puts a bit of stress onto the fuel-supply system, so that a marginally working fuel pressure regulator after the braking does not supply full fuel pressure for a little while and this in turn causes the misfire.

Id suggest to measure the fuel-pressure when idling, both with the vacuum hose connected and disconnected. When connected the fuel-pressure should be 5.0 bar and when disconnected 5.5 bar.

This is a low cost thing at any competent mechanic or dealer. You will not need a DIS or GT-1, just a fuel pressure gauge that fits BMW.

For good measure I would also check for any wiring that is loose from its cable-clamps, both in the engine compartment and under the car.

David

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How to test the MAFs yourself:
http://www.m5board.com/vbulletin/e39-m5-e52-z8-discussion/54788-how-test-mafs-yourself-how-mafs-work.html

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http://www.m5board.com/vbulletin/e39-m5-e52-z8-discussion/88323-davids-som-useful-threads-info.html
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post #29 of 59 Old 1st August 2005, 08:05 AM Thread Starter
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Re: Engine Miss + SES = CPS?

thanks for the thoughts, David.
Mike

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post #30 of 59 Old 1st August 2005, 07:07 PM
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Re: Engine Miss + SES = CPS?

Quote:
Originally Posted by mottati
Bringing back this thread i started a few months ago. I replaced my plugs shortly after this incident with denso irridium plugs (hold on...) and ignition solutions plasma coils. I honestly notice no realy difference in performance with these mods, although my fuel economy did improve by 1.2mpg according to the obc.

I did a trackday at buttonwillow, no misses or issues, problem solved... but wait, it's not.

Last night, bedding in new pads and rotors, temp in the mid 70'sF. After my third slowdown, back in second, moderate acceleration, at around 4k rpm, misfire, ses light... ****. shut off, restart all is fine, and i drive the heck out of the car for the next 15 minutes, wot, 7k rpm, etc trying to get it to happen again, it doesn't. Peak reader says cyl 1 misfire.

I pulled the plugs today, looked carefully at the wiring, boots etc. All looked perfect. Because of the tales of horror and woe regarding non-oe plugs, i reinstalled a set of 5k mile old bmw/ngks, just for the heck of it. Interestingly, throttle responce seems a little sharper with the oe plugs, vs the irridiums.

Ok, the real reason i brought this back up was this other thread:
Engine problem

Read post number 8, by Pong. He had a misfire associated with brake pad bedding. My initial misfires at sears point were consistantly right after turn 7, a heavy braking hairpin...
What could cause a misfire after braking?
Mike
Mike,

That is so ironic....The exact same thing happened to me as I was bedding in my new Stoptechs....

I even called Bill at D/A in a panic...That was three months ago...I like you have beat the heck out of the motor (and the brakes) with out any repeat of the earlier brake bedding incident...

Mark

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