Hello all. I am hoping to get some help with my sy#1299. I recently had my coil go out, replaced it, was driving to work and then it began to hesitate on acceleration and idle extremely rough. Popped the hood and saw the #6 plug wire melted. Easy fix :tup: so I thought. I replaced cap, rotor, wires(msd 8.5 mm pn 31849) and ngk plugs (pn2771 gapped to .026). Fired it up and have the exact same misfire and hesitation. Checked for vacuum leaks (none) and triple checked firing order. Drove and seems to run ok around 3,000 rpm. Any ideas :roll: Thanks
Rough idle and hesitation on acceleration
- Thread starter JEB91SY
- Start date
Black Knight
I Glow Therefore I am
Re: Rough idle and hesitation on acceleration
.032-.035
.032-.035
It's just a six
Super Member
Re: Rough idle and hesitation on acceleration
As I always say, sometimes new parts do not work as they are supposed to.
As I always say, sometimes new parts do not work as they are supposed to.
QUICK STORM
B.A.M.F. BMW Tech
Re: Rough idle and hesitation on acceleration
don't be shy, change the fuel filter as well. what kind of fuel pump do you have?
don't be shy, change the fuel filter as well. what kind of fuel pump do you have?
gjp
another post whore
Re: Rough idle and hesitation on acceleration
x2
Mine was bent over real tight at the connector n the coil. when I opened up the insulation I had only a few strands of wire still connected. So far I have no problems. Its just another thing to check.make sure the other in is good inthe dist. If it was fine before you changed the coil it sounds like you did something when you changed it. double check all connections and vacuum lines. The map sensor is by the coil. check the vac and connections there. did you change the timming when you replaced the wires.
x2
Mine was bent over real tight at the connector n the coil. when I opened up the insulation I had only a few strands of wire still connected. So far I have no problems. Its just another thing to check.make sure the other in is good inthe dist. If it was fine before you changed the coil it sounds like you did something when you changed it. double check all connections and vacuum lines. The map sensor is by the coil. check the vac and connections there. did you change the timming when you replaced the wires.
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B.A.M.F. BMW Tech
Re: Rough idle and hesitation on acceleration
we don't have a real big problem with valve adjustment. do what we suggest before you pull the valve covers.
we don't have a real big problem with valve adjustment. do what we suggest before you pull the valve covers.
Re: Rough idle and hesitation on acceleration
Well guy's did all that was recommened and found the hose off the turbo extremely loose. Tightened buttoned everything up, idle was slightly better, but still had the same concern. While it was running I heard an abnormal ticking noise from one/serveral injectors. While at idle I did the old screw driver sound check and #3 injector sounds different from all others (at idle). Does anyone have anyother test procedures to try before I replace the injectors since I'm limited on diagnostic equipment?
Well guy's did all that was recommened and found the hose off the turbo extremely loose. Tightened buttoned everything up, idle was slightly better, but still had the same concern. While it was running I heard an abnormal ticking noise from one/serveral injectors. While at idle I did the old screw driver sound check and #3 injector sounds different from all others (at idle). Does anyone have anyother test procedures to try before I replace the injectors since I'm limited on diagnostic equipment?
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B.A.M.F. BMW Tech
Re: Rough idle and hesitation on acceleration
if you want swap injectors 1-3, to see if the sound follows. if it does i would replace injectors. i have a set of stock injectors for $50.
if you want swap injectors 1-3, to see if the sound follows. if it does i would replace injectors. i have a set of stock injectors for $50.
Don W.
Stab it and steer it
Re: Rough idle and hesitation on acceleration
Hmmm. My :2cents: is to check that #3 plug compared to at least the others on that side. Swapping the inj with another is a good idea. If the engine has never been touched a vac leak affecting just that cyl is unlikely but vac leaks in general are an issue. Might be that with a vac leak and the narrow plug gap you're running just lean enough to cause the miss. But you say you've checked for vac leaks...
Does the miss always seem to be that #3 or more random? Check the ohms in that plug wire compared to any other. Maybe one bad wire? On the last resort list do a compression check.
Let us know what you find.
If you want to try an inj cleaner, I'm sold on this stuff:
Lubro Molly inj cleaner, and
Lubro Molly valve cleaner
4th and 1st items on this page (for example):
http://tinyurl.com/hu83p
Hmmm. My :2cents: is to check that #3 plug compared to at least the others on that side. Swapping the inj with another is a good idea. If the engine has never been touched a vac leak affecting just that cyl is unlikely but vac leaks in general are an issue. Might be that with a vac leak and the narrow plug gap you're running just lean enough to cause the miss. But you say you've checked for vac leaks...
Does the miss always seem to be that #3 or more random? Check the ohms in that plug wire compared to any other. Maybe one bad wire? On the last resort list do a compression check.
Let us know what you find.
If you want to try an inj cleaner, I'm sold on this stuff:
Lubro Molly inj cleaner, and
Lubro Molly valve cleaner
4th and 1st items on this page (for example):
http://tinyurl.com/hu83p
Re: Rough idle and hesitation on acceleration
I've never heard of that cleaner. Where can you get it? I have changed the gap to .032 and that plug was kinda wet compaired to the other two on that side. Great idea on the injector swap and it's injector #1 (I'm a hippie LOL). I pulled the plugs on that side and found that #3 had fuel on it???? I will try the fuel cleaner and then swapp # 1 & # 3. I would like to try that other injector cleaner, but how do you feel about BG44K? I will most likely pick up those stock injector either way. Pm me or e-mail me the info: jebalmaceda@comcast.net
Thanks for the info gents and I'll let you know tomorrow or weds on what I find.
I've never heard of that cleaner. Where can you get it? I have changed the gap to .032 and that plug was kinda wet compaired to the other two on that side. Great idea on the injector swap and it's injector #1 (I'm a hippie LOL). I pulled the plugs on that side and found that #3 had fuel on it???? I will try the fuel cleaner and then swapp # 1 & # 3. I would like to try that other injector cleaner, but how do you feel about BG44K? I will most likely pick up those stock injector either way. Pm me or e-mail me the info: jebalmaceda@comcast.net
Thanks for the info gents and I'll let you know tomorrow or weds on what I find.
Don W.
Stab it and steer it
Re: Rough idle and hesitation on acceleration
Try the link on the bottom of my post, worked for me. The reason I'm sold on this stuff is it really made a difference on one of my cars. Very noticeable. Couldn't really tell if it made any difference on the Sy but it's low mileage with new (last year) injs.
JEB91SY said:
Try the link on the bottom of my post, worked for me. The reason I'm sold on this stuff is it really made a difference on one of my cars. Very noticeable. Couldn't really tell if it made any difference on the Sy but it's low mileage with new (last year) injs.
QUICK STORM
B.A.M.F. BMW Tech
Re: Rough idle and hesitation on acceleration
PM sent
PM sent
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B.A.M.F. BMW Tech
Re: Rough idle and hesitation on acceleration
will send out tommorrow
will send out tommorrow
Re: Rough idle and hesitation on acceleration
Looking to buy a Syclone this weekend and it has a similar problem. Rough idle and poor acceleration. Guys claims he found rear plug wire (turbo side...guessing #6?) has burnt from the exh manifold. Is this common if the wires aren't clipped into the holder?
Looking to buy a Syclone this weekend and it has a similar problem. Rough idle and poor acceleration. Guys claims he found rear plug wire (turbo side...guessing #6?) has burnt from the exh manifold. Is this common if the wires aren't clipped into the holder?
QUICK STORM
B.A.M.F. BMW Tech
Re: Rough idle and hesitation on acceleration
yes, #6 plug wire should be a straight one, not a 90.
BacDoc said:
yes, #6 plug wire should be a straight one, not a 90.