00vi swap > misfire and vac leak
05-12-2007, 11:37 AM
#1
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Join Date: Aug 2002
Location: Dallas, TX
Posts: 134
00vi swap > misfire and vac leak
Finally started the engine up after 4 months of a slow 00vi swap. Using 00 injectors, fuel rail, rear coils and valve cover, EGR uptube, 4th gen TB and iacv.
Two things going on- getting an 0606 code- misfire on cylinder 3. Also a pretty decent vacuum leak that I can't yet find; getting a constant "vaccum leak sound" and tweaking the throttle gives a big "whoosh". No stalling, though. Anyway, the rear coils and all 6 injectors are used with the 00vi I bought; all 6 injectors went to deastchworks before install (1 was slightly clogger and supposedly fixed). So, hopefully it's not any of the injectors. Swapped cylinder 3 coil for another rear coil and still got the code for cylinder 3- so its not a coil problem. Didn't have an injector issues before so hopefully thats not it. Road tested around the block and certainly didn't feel like I was running on 5 cylinders. Withough pushing it hard, the only cue that I had a misfire was hearing a slight "knocking" that came and went, was around maybe 3/4 of the time, in step with the engine speed, and could only hear it with the hood up.
Could a ground problem cause a misfire on only 1 cylinder? How about a vacuum leak?
Things I'm going to check next:
-pull plug #3 to make sure no gunk fell in to foul the connection between the plug and the coil
-find the electrical connector for the rear injectors and check resistance for injector #3
-swap plug #3 for another to make sure plug #3 isn't bad
-keep looking for the vacuum leak (read a great post on spraying some starter fluid around wuile idling and if the revs go up, the leak has been found- great idea!)
-only connection that didn't have a fresh gasket was the lower end of the egr guide tube to the egr assembly- though i dont think a leak here would cause a whoosh on tweaking the throttle
-any other ideas on things to check for misfire before I get down to pulling the upper IM?
Thanks all!
Two things going on- getting an 0606 code- misfire on cylinder 3. Also a pretty decent vacuum leak that I can't yet find; getting a constant "vaccum leak sound" and tweaking the throttle gives a big "whoosh". No stalling, though. Anyway, the rear coils and all 6 injectors are used with the 00vi I bought; all 6 injectors went to deastchworks before install (1 was slightly clogger and supposedly fixed). So, hopefully it's not any of the injectors. Swapped cylinder 3 coil for another rear coil and still got the code for cylinder 3- so its not a coil problem. Didn't have an injector issues before so hopefully thats not it. Road tested around the block and certainly didn't feel like I was running on 5 cylinders. Withough pushing it hard, the only cue that I had a misfire was hearing a slight "knocking" that came and went, was around maybe 3/4 of the time, in step with the engine speed, and could only hear it with the hood up.
Could a ground problem cause a misfire on only 1 cylinder? How about a vacuum leak?
Things I'm going to check next:
-pull plug #3 to make sure no gunk fell in to foul the connection between the plug and the coil
-find the electrical connector for the rear injectors and check resistance for injector #3
-swap plug #3 for another to make sure plug #3 isn't bad
-keep looking for the vacuum leak (read a great post on spraying some starter fluid around wuile idling and if the revs go up, the leak has been found- great idea!)
-only connection that didn't have a fresh gasket was the lower end of the egr guide tube to the egr assembly- though i dont think a leak here would cause a whoosh on tweaking the throttle
-any other ideas on things to check for misfire before I get down to pulling the upper IM?
Thanks all!
05-13-2007, 04:04 PM
#2
Supporting Maxima.org Member
Thread Starter
iTrader: (4)
Join Date: Aug 2002
Location: Dallas, TX
Posts: 134
For anyone interested, pulling sparkplug and reseating everything did the trick for the misfire. Not sure if there was some dust/dirt between at the coil/plug contact or what.
05-14-2007, 08:12 AM
#4
Originally Posted by texasmax
Finally started the engine up after 4 months of a slow 00vi swap. Using 00 injectors, fuel rail, rear coils and valve cover, EGR uptube, 4th gen TB and iacv.
Two things going on- getting an 0606 code- misfire on cylinder 3. Also a pretty decent vacuum leak that I can't yet find; getting a constant "vaccum leak sound" and tweaking the throttle gives a big "whoosh". No stalling, though. Anyway, the rear coils and all 6 injectors are used with the 00vi I bought; all 6 injectors went to deastchworks before install (1 was slightly clogger and supposedly fixed). So, hopefully it's not any of the injectors. Swapped cylinder 3 coil for another rear coil and still got the code for cylinder 3- so its not a coil problem. Didn't have an injector issues before so hopefully thats not it. Road tested around the block and certainly didn't feel like I was running on 5 cylinders. Withough pushing it hard, the only cue that I had a misfire was hearing a slight "knocking" that came and went, was around maybe 3/4 of the time, in step with the engine speed, and could only hear it with the hood up.
Could a ground problem cause a misfire on only 1 cylinder? How about a vacuum leak?
Things I'm going to check next:
-pull plug #3 to make sure no gunk fell in to foul the connection between the plug and the coil
-find the electrical connector for the rear injectors and check resistance for injector #3
-swap plug #3 for another to make sure plug #3 isn't bad
-keep looking for the vacuum leak (read a great post on spraying some starter fluid around wuile idling and if the revs go up, the leak has been found- great idea!)
-only connection that didn't have a fresh gasket was the lower end of the egr guide tube to the egr assembly- though i dont think a leak here would cause a whoosh on tweaking the throttle
-any other ideas on things to check for misfire before I get down to pulling the upper IM?
Thanks all!
Two things going on- getting an 0606 code- misfire on cylinder 3. Also a pretty decent vacuum leak that I can't yet find; getting a constant "vaccum leak sound" and tweaking the throttle gives a big "whoosh". No stalling, though. Anyway, the rear coils and all 6 injectors are used with the 00vi I bought; all 6 injectors went to deastchworks before install (1 was slightly clogger and supposedly fixed). So, hopefully it's not any of the injectors. Swapped cylinder 3 coil for another rear coil and still got the code for cylinder 3- so its not a coil problem. Didn't have an injector issues before so hopefully thats not it. Road tested around the block and certainly didn't feel like I was running on 5 cylinders. Withough pushing it hard, the only cue that I had a misfire was hearing a slight "knocking" that came and went, was around maybe 3/4 of the time, in step with the engine speed, and could only hear it with the hood up.
Could a ground problem cause a misfire on only 1 cylinder? How about a vacuum leak?
Things I'm going to check next:
-pull plug #3 to make sure no gunk fell in to foul the connection between the plug and the coil
-find the electrical connector for the rear injectors and check resistance for injector #3
-swap plug #3 for another to make sure plug #3 isn't bad
-keep looking for the vacuum leak (read a great post on spraying some starter fluid around wuile idling and if the revs go up, the leak has been found- great idea!)
-only connection that didn't have a fresh gasket was the lower end of the egr guide tube to the egr assembly- though i dont think a leak here would cause a whoosh on tweaking the throttle
-any other ideas on things to check for misfire before I get down to pulling the upper IM?
Thanks all!
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