Weird Plug
- Thread starter Don W.
- Start date
turbodig
Active member
Re: Weird Plug
What cyl # was it?
Looks like an oil-foul to me. I'd also suspect a bad guide, or a PCV that's leaking something into the intake.
Another possibility... bad intake gasket on that hole... sucking in oil from the lifter valley.
Don W. said:Trying to tune out an idle miss to pass smog. Pulled out my new plugs. No boost launch. Just normal driving on these. Very few miles. Found this. All the others look like th one on the left. Wuzup...
What cyl # was it?
Looks like an oil-foul to me. I'd also suspect a bad guide, or a PCV that's leaking something into the intake.
Another possibility... bad intake gasket on that hole... sucking in oil from the lifter valley.
Don W.
Stab it and steer it
Re: Weird Plug
It was cyl 4. The engine doesn't use any oil, I don't think it's that. PVC valves are new. A plug site I found:
http://www.centuryperformance.com/spark2.asp
says it's a bad/dirty inj. I have a miss, I have an extra inj, I'm changing that now. I've put a new plug in that hole so after inj is changed I'll drive it for a while and pull that plug and see if it's changed.
Thanks all, I'll let you know what happens.
It was cyl 4. The engine doesn't use any oil, I don't think it's that. PVC valves are new. A plug site I found:
http://www.centuryperformance.com/spark2.asp
says it's a bad/dirty inj. I have a miss, I have an extra inj, I'm changing that now. I've put a new plug in that hole so after inj is changed I'll drive it for a while and pull that plug and see if it's changed.
Thanks all, I'll let you know what happens.
QUICK STORM
B.A.M.F. BMW Tech
Re: Weird Plug
6a will definately help out don!, looks you need to add this to your mods list, hehe.
6a will definately help out don!, looks you need to add this to your mods list, hehe.
Don W.
Stab it and steer it
Re: Weird Plug
Well I had a scope put on it and they said my dist was bad. No way to tell if it was the module or the reluctor(sp?). Installed a rebuilt. Right away I noticed and improvement in how quickly it starts. Down side is it still has a miss at idle.
The miss is random and often enough to fail the smog. Otherwise I wouldn't be here.
My next step, haven't decided for sure, is iridium plugs. I also have a set of stock inj's. Thinking I might send those out for rebuild. Any recommendations?
Registration is up next week so I'll get an extension there. Would like to figure this out though. I don't like to just keep throwing parts at it. Could call the scope place but that's another 65.00 and a weeks wait.
Truck runs great otherwise and racing starts the 7th so want it running for that.
Well I had a scope put on it and they said my dist was bad. No way to tell if it was the module or the reluctor(sp?). Installed a rebuilt. Right away I noticed and improvement in how quickly it starts. Down side is it still has a miss at idle.
My next step, haven't decided for sure, is iridium plugs. I also have a set of stock inj's. Thinking I might send those out for rebuild. Any recommendations?
Registration is up next week so I'll get an extension there. Would like to figure this out though. I don't like to just keep throwing parts at it. Could call the scope place but that's another 65.00 and a weeks wait.
Don W.
Stab it and steer it
Re: Weird Plug
:rotf: Ask and you shall receive.:rotf: I have a block-off plate, will test tomorrow. But I have to ask, what "couple of ways" are you thinking about. Mixture, idle speed, ?? I'm getting tired of chasing this rather minor idle miss just for smog and would like to move on.
Thanks
:rotf: Ask and you shall receive.:rotf: I have a block-off plate, will test tomorrow. But I have to ask, what "couple of ways" are you thinking about. Mixture, idle speed, ?? I'm getting tired of chasing this rather minor idle miss just for smog and would like to move on.
Thanks
It's just a six
Super Member
Re: Weird Plug
Just curious on what you have your fuel pressure set @?
Just curious on what you have your fuel pressure set @?
Don W.
Stab it and steer it
Re: Weird Plug
40# static (engine off) I don't think it's that. When I'm hooked up to the sniffer (manual mode) and play with the FP it make almost no difference. Something else going on IMO. Will be pulling the EGR today for a test. If that doesn't do it I'm thinking a set of iridium plugs then a set of rebuilt inj's.
40# static (engine off) I don't think it's that. When I'm hooked up to the sniffer (manual mode) and play with the FP it make almost no difference. Something else going on IMO. Will be pulling the EGR today for a test. If that doesn't do it I'm thinking a set of iridium plugs then a set of rebuilt inj's.
Don W.
Stab it and steer it
Re: Weird Plug
OK, replaced the EGR. No help. Here is a link to a datamaster file of the engine idling.
http://www.sonic.net/~donpris/AutoLog_159.uni
I'm no expert here but if I look at the 02 mv they're all over the map. Is this normal at idle? Appreciate the help.
OK, replaced the EGR. No help. Here is a link to a datamaster file of the engine idling.
http://www.sonic.net/~donpris/AutoLog_159.uni
I'm no expert here but if I look at the 02 mv they're all over the map. Is this normal at idle? Appreciate the help.