idle missfire??
- Thread starter gjp
- Start date
gjp
another post whore
Re: idle missfire??
HELP!!! $hit, its not gone. Switch, wires, msd coil and its still missing. I noticed something wet (gas I think) on plug 1. I figured ok bad wire. Replaced the wires and it still misses. Only after its warm. For the first 10 min. its great. When I give it gas it takes off good. I am still getting more KR then I want but I have to fix this first. What else could it be????????????????????? Cap and rotor looked fine but I will put in new ones. I will also pick up a new plug to se if I did not just get a bad one. HELP!!! anyone, this is driving me crazy. A new charger is looking more apealing each day. I love my sy but I want to drive it! I will give it one more month and 500$ and if nothing... E-bay.
HELP!!! $hit, its not gone. Switch, wires, msd coil and its still missing. I noticed something wet (gas I think) on plug 1. I figured ok bad wire. Replaced the wires and it still misses. Only after its warm. For the first 10 min. its great. When I give it gas it takes off good. I am still getting more KR then I want but I have to fix this first. What else could it be????????????????????? Cap and rotor looked fine but I will put in new ones. I will also pick up a new plug to se if I did not just get a bad one. HELP!!! anyone, this is driving me crazy. A new charger is looking more apealing each day. I love my sy but I want to drive it! I will give it one more month and 500$ and if nothing... E-bay.
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B.A.M.F. BMW Tech
Re: idle missfire??
maybe your lower intake gasket is leaking, very common
maybe your lower intake gasket is leaking, very common
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B.A.M.F. BMW Tech
Re: idle missfire??
stick with it man
stick with it man
gjp
another post whore
Re: idle missfire??
my engine does have leaks. I see oil everywhere but nothing drips. I just wipe it up at each oil change. The misfire started right after I used the xylene. Coult it have messed up my O2?? The dm shows everything is good. I want to track down the misfire before I go crazy! Picked up a rotor and cap. Old ones look good but who knows. Might get a dist. if I can find someone to help me instal??
Guy at my work said its possibe a bad valve could be causing this. I did a compression test but when the engine was cold. Mabe I should do one after The idle problem starts. Under wot it feels good?? Thats what I dont get.
Like I said, I bought it to drive and have fun. If it was going to be a collector car I would have bought one with less miles. I dodnt want to beat it up, just enjoy it. I have had it for 6 months now and got to take it out for 4 weekends while it ran good. To date plus price of the truck I have spent 17-18k and cant drive it. I love my sy but....
my engine does have leaks. I see oil everywhere but nothing drips. I just wipe it up at each oil change. The misfire started right after I used the xylene. Coult it have messed up my O2?? The dm shows everything is good. I want to track down the misfire before I go crazy! Picked up a rotor and cap. Old ones look good but who knows. Might get a dist. if I can find someone to help me instal??
Guy at my work said its possibe a bad valve could be causing this. I did a compression test but when the engine was cold. Mabe I should do one after The idle problem starts. Under wot it feels good?? Thats what I dont get.
Like I said, I bought it to drive and have fun. If it was going to be a collector car I would have bought one with less miles. I dodnt want to beat it up, just enjoy it. I have had it for 6 months now and got to take it out for 4 weekends while it ran good. To date plus price of the truck I have spent 17-18k and cant drive it. I love my sy but....
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B.A.M.F. BMW Tech
Re: idle missfire??
well i would change the o2, only if the misfire happens in closed loop, i believe phils chip disables closed loop. is the misfire way to unbearable for you? when it misfires does it feel like its going to stall out or is it a rough idle like wild cam or something? from all your revious posts it sounds like your truck is running very well. it seems that all our trucks are plauged with a rough idle. i don't mind it that much, it reminds me that my truck is running as opposed to all the BMWs at work that don't even make a sound at idle. to each is own.:2cents:
at least you have a truck that is running
well i would change the o2, only if the misfire happens in closed loop, i believe phils chip disables closed loop. is the misfire way to unbearable for you? when it misfires does it feel like its going to stall out or is it a rough idle like wild cam or something? from all your revious posts it sounds like your truck is running very well. it seems that all our trucks are plauged with a rough idle. i don't mind it that much, it reminds me that my truck is running as opposed to all the BMWs at work that don't even make a sound at idle. to each is own.:2cents:
at least you have a truck that is running
gjp
another post whore
Re: idle missfire??
Before it had a rough idle. When its cold with the phil chip it idles strong and smoth. when it warms up it is bad, very bad. I had a 600hp 396 that idled better I too love that rough idle.lol. It does have a problem. I pops hard out of the exhaust and sounds like it wants to die. The engine shakes bad. all the plugs look ok. each had a light burn spot on one side and the tips were a bit whiteish. Plug one was darker with what smelted like fuel. I assumed a bad wire. Before I had a slight problem and a rotor and cap fixed it. I only have 1k on the cap. I did look at it thismorning and it has turned green and has burn marks but I have seen worse caps run good on my other cars. I picked up a new cap,rotor and a plug to replace the one bad one. If that dont work I will try the injector switch, then a new dist. After that I guess I will take it in to see what a pro thinks.
Q.S. I will trade you.lol Because it runs as long as you go on a short trip. There was so much I wanted to do to this truck and now I have to use the cash just to make it run.
Before it had a rough idle. When its cold with the phil chip it idles strong and smoth. when it warms up it is bad, very bad. I had a 600hp 396 that idled better I too love that rough idle.lol. It does have a problem. I pops hard out of the exhaust and sounds like it wants to die. The engine shakes bad. all the plugs look ok. each had a light burn spot on one side and the tips were a bit whiteish. Plug one was darker with what smelted like fuel. I assumed a bad wire. Before I had a slight problem and a rotor and cap fixed it. I only have 1k on the cap. I did look at it thismorning and it has turned green and has burn marks but I have seen worse caps run good on my other cars. I picked up a new cap,rotor and a plug to replace the one bad one. If that dont work I will try the injector switch, then a new dist. After that I guess I will take it in to see what a pro thinks.
Q.S. I will trade you.lol Because it runs as long as you go on a short trip. There was so much I wanted to do to this truck and now I have to use the cash just to make it run.
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B.A.M.F. BMW Tech
Re: idle missfire??
i assume you already did an ignition module, right. what were your compression readings? when you hook up a vacuum gauge, is vacuum constant or does it bounce around? did you get it to run lower KR at WOT? what happens on a long trip? jeremy mentioned a while back that he redid the lower intake gasket and his idle smoothed out. im trying my best to help you out.
i assume you already did an ignition module, right. what were your compression readings? when you hook up a vacuum gauge, is vacuum constant or does it bounce around? did you get it to run lower KR at WOT? what happens on a long trip? jeremy mentioned a while back that he redid the lower intake gasket and his idle smoothed out. im trying my best to help you out.
gjp
another post whore
Re: idle missfire??
module... uh...no. I did a comp test when I first had the missing but it was not that bad. I remember they were in the high 140's to low 160's. I had all the plugs out when I did it. Vaccume is constant at idle. Around 19hg. on 91 I still will get a spike of 5* then it would drop down to 2-3*. Jeremy has been e-mail me to help out.
I did the cap,rotor and replaced the plug on #1 ( it look good this time when I pulled it of) It started good and idled for 10-15 min. I went around with a piece of hose looking for any odd sounds. After 15 min of idle it started to miss again. First it would pop only once a few seconds. Then more and more. Over a 10 min time it would prety much pop 2-3 times a second. The idle will bounce around. I listened again. All Around and in the pcv hose, around each injector,... I heard nothing different this time but the sounds comming out the exhaust. Oil looks good, almost to good. It looks to clean for a 95k engine. but it only had 10 miles on a fresh change.
I have to apologize for this long tread. I know all these posts are driving some guys nuts. I also would like to thank the guys helping me out. You have all been a real help. I have learned so much in the past few months. THANK YOU.
module... uh...no. I did a comp test when I first had the missing but it was not that bad. I remember they were in the high 140's to low 160's. I had all the plugs out when I did it. Vaccume is constant at idle. Around 19hg. on 91 I still will get a spike of 5* then it would drop down to 2-3*. Jeremy has been e-mail me to help out.
I did the cap,rotor and replaced the plug on #1 ( it look good this time when I pulled it of) It started good and idled for 10-15 min. I went around with a piece of hose looking for any odd sounds. After 15 min of idle it started to miss again. First it would pop only once a few seconds. Then more and more. Over a 10 min time it would prety much pop 2-3 times a second. The idle will bounce around. I listened again. All Around and in the pcv hose, around each injector,... I heard nothing different this time but the sounds comming out the exhaust. Oil looks good, almost to good. It looks to clean for a 95k engine. but it only had 10 miles on a fresh change.
I have to apologize for this long tread. I know all these posts are driving some guys nuts. I also would like to thank the guys helping me out. You have all been a real help. I have learned so much in the past few months. THANK YOU.
SY2455
70's Veteran
Re: idle missfire??
This may sound funny, but recheck your timing again. My truck with 83k idles with 22hg and after puting in a MSD-6A that all to common idle missfire is gone most of the time, unless I run it hard. My compression test came out to be 155 - 160 lb. The lowest cyl was # 4 at 155lb.
gjp said:
This may sound funny, but recheck your timing again. My truck with 83k idles with 22hg and after puting in a MSD-6A that all to common idle missfire is gone most of the time, unless I run it hard. My compression test came out to be 155 - 160 lb. The lowest cyl was # 4 at 155lb.
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B.A.M.F. BMW Tech
Re: idle missfire??
do an ignition module, get one from AC delco
do an ignition module, get one from AC delco
gjp
another post whore
Re: idle missfire??
I figure If I get a new dist. it comes with a module. module is 40$ and a whole new dist. from napa is 135$. Would it cause a bad idle when warm. My truck is very specific. When coold I can boost to 18psi and no missfire. As soon as its been running for 10+ min. all hell breaks loose.
Here is something I was thinking today at work. Could it be my plugs. I am running ur6's to help with KR. Could they be too cold and fouling up. All the plugs however look white on the tips with black around the outer part.
I figure If I get a new dist. it comes with a module. module is 40$ and a whole new dist. from napa is 135$. Would it cause a bad idle when warm. My truck is very specific. When coold I can boost to 18psi and no missfire. As soon as its been running for 10+ min. all hell breaks loose.
Here is something I was thinking today at work. Could it be my plugs. I am running ur6's to help with KR. Could they be too cold and fouling up. All the plugs however look white on the tips with black around the outer part.
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B.A.M.F. BMW Tech
Re: idle missfire??
nope, as soon as that module gets heat on it, it will crap out. change the module first before a dissy. you will be very happy after. i thought you had done one before.
gjp said:
nope, as soon as that module gets heat on it, it will crap out. change the module first before a dissy. you will be very happy after. i thought you had done one before.