Smoking after spark plug change
05-23-05, 12:52 AM
#1
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Smoking after spark plug change
Hi,
My seven has 61k miles and is completely stock except for a timer timer. Anyways, this weekend I was embarking on the project to change my spark plugs for the very first time without any manual. Anyways, the first day I just felt around and got the two right (closer to the firewall) plugs, trailing and leading. Anyways I had thought that there were only two plugs (which was completely wrong) for each rotor, so I assembled everything up. It ran fine.
I then found out that there were two plugs on the other side that I missed more when reading about it. I took the throttle body off this time and put in the other two plugs. They were a bitch so I put anti seize on the threads. Anyways I put everything back together and start the car. The idle was really shitty (didn't do accelerated warm up, bounced up and down, etc.) and it was smoking like crazy. I did some research and then found that my MAP sensor hose was indeed lose. I put it back on.
The idle is all fixed but the car is still smoking like crazy. It smells like fuel, and it is white smoke. My throttle body gasket chipped off a bit at the bolt part but not near the ports, so I reused it again. Aside from that, I can't think of anything that is different. Anyone have this happen before?
I do plan on replacing the gasket and checking all the plug and wire connections, but I'm not really sure that is the problem.
My seven has 61k miles and is completely stock except for a timer timer. Anyways, this weekend I was embarking on the project to change my spark plugs for the very first time without any manual. Anyways, the first day I just felt around and got the two right (closer to the firewall) plugs, trailing and leading. Anyways I had thought that there were only two plugs (which was completely wrong) for each rotor, so I assembled everything up. It ran fine.
I then found out that there were two plugs on the other side that I missed more when reading about it. I took the throttle body off this time and put in the other two plugs. They were a bitch so I put anti seize on the threads. Anyways I put everything back together and start the car. The idle was really shitty (didn't do accelerated warm up, bounced up and down, etc.) and it was smoking like crazy. I did some research and then found that my MAP sensor hose was indeed lose. I put it back on.
The idle is all fixed but the car is still smoking like crazy. It smells like fuel, and it is white smoke. My throttle body gasket chipped off a bit at the bolt part but not near the ports, so I reused it again. Aside from that, I can't think of anything that is different. Anyone have this happen before?
I do plan on replacing the gasket and checking all the plug and wire connections, but I'm not really sure that is the problem.
05-23-05, 07:13 AM
#2
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It ran fine after changing the plugs on just the rear rotor, and then started having problems only after changing the front plugs? And you used anti-seize on the front plugs, but not on the rear ones? You probably got anti-seize on the plug face on the front plugs. Take them out and clean them thoroughly and try again.
The fuel-smelling white "smoke" (vapor) is unburnt fuel. Rotaries are VERY sensitive to plug fouling.
In the future, I'd use anti-seize on all the plugs. Just make sure to only get it on the threads of the plugs! And it doesn't take much of the stuff.
The fuel-smelling white "smoke" (vapor) is unburnt fuel. Rotaries are VERY sensitive to plug fouling.
In the future, I'd use anti-seize on all the plugs. Just make sure to only get it on the threads of the plugs! And it doesn't take much of the stuff.
05-23-05, 01:26 PM
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Did you put in the right plugs? Leading and Trailing plugs are different. You should probly read up on the forum for instructions before you wrench. I find it diffult to comprehend how you missed two of the plugs...
05-23-05, 02:32 PM
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If you're running 7's and/or 9's (any combination really), you shouldn't have visible amounts of unburnt fuel coming out the exhaust at idle. Even if you swapped the so-called "leading" (7) and "trailing" (9) plugs.
Last edited by DigDug; 05-23-05 at 02:35 PM.
05-23-05, 05:16 PM
#6
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Well it seems to be fine now. The front leading (black wire) plug wasn't in all the way. Apparently the plugs like to go through "really hard to wrench" and then "really easy" phases while trying to wrench it in, I thought it was all the way in there. I was afraid of killing the threads.
Anyways the coil is all the way underneath the throttle body, so it is actually fairly easy to miss the two front plugs if you don't take the throttle out (and have never worked on a Seven before). It was hard enough trying to follow the plug wires with the throttle body off. The front plugs are hidden under all those lines.
The exhaust is hot (as usual) and smells like... exhaust now. Maybe with a slight hint of fuel, but that is probably be my imagination.
Thank you for all the help!
Anyways the coil is all the way underneath the throttle body, so it is actually fairly easy to miss the two front plugs if you don't take the throttle out (and have never worked on a Seven before). It was hard enough trying to follow the plug wires with the throttle body off. The front plugs are hidden under all those lines.
The exhaust is hot (as usual) and smells like... exhaust now. Maybe with a slight hint of fuel, but that is probably be my imagination.
Thank you for all the help!
05-23-05, 05:58 PM
#7
Rotary Enthusiast
Originally Posted by AcesHigh
Well it seems to be fine now. The front leading (black wire) plug wasn't in all the way. Apparently the plugs like to go through "really hard to wrench" and then "really easy" phases while trying to wrench it in, I thought it was all the way in there. I was afraid of killing the threads.
Thank you for all the help!
Thank you for all the help!
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05-23-05, 06:01 PM
#8
Rotary Enthusiast
Originally Posted by AcesHigh
Well it seems to be fine now. The front leading (black wire) plug wasn't in all the way. Apparently the plugs like to go through "really hard to wrench" and then "really easy" phases while trying to wrench it in, I thought it was all the way in there. I was afraid of killing the threads.
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