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-   -   Engine Misfire (http://www.maxbimmer.com/forums/showthread.php?t=74416)

vs69 07-10-2006 10:38 AM

Engine Misfire
 
What's up guys, I'm having misfires in cylinder 6 and 8 on my e39 540i, anything I should be looking at besides spark plugs....I hope it doesn;t mean too much $$$$$$.

TheMadChigga 07-10-2006 11:24 AM

swap the spark boots, if it goes away, go buy new boots.

O.S. 07-10-2006 10:00 PM

coils, try switching coils between cilinders and you will see if the missfiress will move to the new location ... thus you'd be able to identify if the plugs are the problem or the coils and which ones.

vs69 07-11-2006 08:52 AM

I'm going to try swapping my friends coil packs and see if they work on his bimmer and see what happens. Then we'll know for sure if it's the coil packs or what not.....thanks guys, I appreciate it. I'll keep you up to date.

NOTORIOUS VR 07-11-2006 05:37 PM

many times it's just the boot's on the end of the coils... so I'd suggest testing the boot thing first as the mad chigga said... it's a lot cheaper then buying new coils that you don't need.

vs69 07-22-2006 09:51 AM

Just to keep you guys up-to date, I went to a BMW shop, the mechanic told me that he cannot further diagnose the misfire's until I change the "cats" and I have 2, the price is roughly 1400$ each, plus install. I personally think it's the "cats"t also because when driving normally...lol on the street reving at 2500rpm;s it;s fine, but the minute I step on it to pass someone, right off the bat at 4000rpm's, you can tell I'm running on like 3 cylinder;s. So I'm thoughts on this are, my cat's are blocked and they rattle like crazy, so they are FINISHED. I'm aiming at getting Magnaflow's for now. After changing those, hopefully the misfires will go away, if not spark plugs and then coil paks and boots.

Quack 07-22-2006 05:34 PM

I had a severe misfire problem with my 540 because of clogged cats, had the same problems to, I can drive fine in the city but when I try to pass someone on the hwy the car would start to misfire, I ending up getting Brullen Hi-Flow cats for $150 each & a whole new cat-back system from Brullen for $1200, problem with the Hi-flows cats almost caused me to fail emissions

vs69 07-24-2006 06:02 PM

I just don't understand how both my cats could've gone bad within a couple months, what was and what am I doing not right?

Quack 07-24-2006 08:10 PM

you mean you had them replaced a couple of months ago already?

vs69 07-24-2006 08:41 PM

no, but I bmw cats aren't normally supposed to go. I mean other vehicles like toyota's, you might expect a rusty cat needs to get changed. So I've been told anyways...I don;t know.

Quack 07-24-2006 09:25 PM

euro car cats go more often than cats from Japanese & domestics, I don't know how many times I've seen cats go on BMW/Benzs/Audi/VW, it's a common problem

RMPMOTORS 07-27-2006 11:31 PM

Your missing is on the same bank, only one cat can be the culprit.


Rocco

Quack 07-27-2006 11:36 PM

he might as well replace both, most likely the other one will go soon, and besides if he goes aftermarket cats they are like $100-$200 each

EugeneBMW 07-28-2006 06:19 PM

I just got my 2000 M5 and am experiencing the same problem. driving at a constant RPM is fine but while accerating at lower RPMs, my car jerks as if its lacking power (not something i would expect form this car). I was thinking to clean the throttle boddies, but aside from that, i dont really know what i can do. Any advise?

vs69 07-28-2006 09:41 PM

Well, I'm finally going to the garage tomorrow morning to change the cats. I'm getting installed 2 Magnaflow cats part# 94106 and we'll see what happens there. If my misfires stop, then great news, if not, I'm going after the coil packs and spark plugs. But then again, I don;t want to go that far. Although one night, I jacked up the front end of my car and rattled both cats too see if both were rattling and you can hear both were finished. When leaving that night, I didn;t have any misfires for at least two days. So I honestly think, it's the cats that are clogged. But we'll see tomorrow. I'll keep you up to date tomorrow.

vs69 07-29-2006 08:20 PM

Hey guys, got my car back and my car is running beautifuly. It was the cats all along, the cause of the misfires. Doesn;t mean it applies to everyone, but on my way there, it was hell. I couldn;t accelerate properly. Then it would start shaking and everything. Anyways, got Magnaflows, and I don;t know if it's just me but I hear a nicer sound to my exhaust. You can hear the hi-flow cats. It's more of a deeper sound. No much, but it is noticeable.

O.S. 07-31-2006 12:40 PM

great news ... and yes ... magnaflow cats change the sound somewhat

Quack 07-31-2006 12:46 PM

glad everything worked out, now go get a cat-back exhaust system, you will notice a lot more sound & with a aftermarket resonator you'll reduce another 30+ pounds off the car, too bad you're in Montreal or you will be able to listen to exhaust system on my 540, it's very unique

vs69 07-31-2006 10:14 PM

Ya, I would've of loved to have seen your exhaust, but it's dangerous when I see stuff like that, cuz then I want it so badly....lol But it most sound nice. I haven;t heard a LIVE e39 with exhaust yet. Every BMW meet I go to, I'm the only guy there with a 5 series and mine isn;t moded yet. Anyways, if you EVER have any sound clips or vid's of your car, please let me know, I would be very interested or if you ever decided to come down for the odd reason, to montreal, let me know.

Quack 07-31-2006 10:21 PM

Quote:

Originally Posted by vs69
Ya, I would've of loved to have seen your exhaust, but it's dangerous when I see stuff like that, cuz then I want it so badly....lol But it most sound nice. I haven;t heard a LIVE e39 with exhaust yet. Every BMW meet I go to, I'm the only guy there with a 5 series and mine isn;t moded yet. Anyways, if you EVER have any sound clips or vid's of your car, please let me know, I would be very interested or if you ever decided to come down for the odd reason, to montreal, let me know.

will do, I'll head over to Montreal every now and then, the thing that makes my exhaust unique is that it is made by Brullen, full cat-back with hi-flow cats, I was told that I was the only 540 they made this exhaust for, & since they went bankrupt no more will be produce, making it one of a kind, but I also got screwed over for the lifetime warranty deal *shiner*

vs69 08-01-2006 10:41 PM

Sounds good, Your exhaust looks really nice from the pics I've seen. It;s very discreet, which is something I'm looking for. The Dinan seems to stick out too much. But then I heard that you need to have stock BMW cats in order to fully utilize the Dinan exhaust...I don;t know. I'd rather listen to your first but then again, the company is out...But that would be awesome if you can come down one week-end. I don;t know if you'll be attending the...hopefully...soon, Autumn BMWCC cruize. I should be there. But let me know...

sam323 08-06-2006 11:37 AM

hey guys , my body has the same problem on his 99 540, both his cats are gone but ive heard the after market ones only last like 2 or 3 month, how long do the magnoflows last and how much do they cost? and i also heard that when they mod these cars they remove cats and that gives more horse and replace it by pipes or something.....

Quack 08-06-2006 11:40 AM

well removing cats are illegal, and you will fail the emission test, I have aftermarket cats that I got installed 2 years ago, no problems yet, aftermarket cats cost anywhere between $100-150

sam323 08-06-2006 11:43 AM

hey guys my body has the same problem on his 99 540, but ive heard that the after markets dont last long, how long do the magnoflows last and how much r they?

Quack 08-06-2006 11:45 AM

why did you ask the same question again?

BMW TECH 1 08-14-2006 07:56 PM

There is a way to test the coils . With a tool called autologic it can give you the values of each cylinder and tell witch are not firing . Because if you plan on removing the coils be shure they are installed right or you will short them out or ZAP your self . Good luck


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