Longtube headers w emissions 95 z28
#1
Longtube headers w emissions 95 z28
Hi I installed pacesetter lt headers on my 95 z28 and I bought the ones with the Air and egr hookups. I have another thread on here about the right caps to plug off the air holes on the header and I still can’t find the right caps. On another note I got the car together and drove it open headers over to the exhaust shop where they installed my y pipe and they also installed a block off plate for the egr flange on the passenger side header. After I got it home I deleted the egr with the 2 other block off plates I had and the car kinda runs not as good as it used to. Since the header install with an off-road y pipe and a flow master exhaust with no cat I have not noticed any power gains from the stock manifolds. In fact the car felt like it had more power with the stock manifolds on. Also I am hearing a whining noise which sounds like it’s coming from the engine bay. When I capped off the air holes on the header I left the driver and passenger side air pump hoses just laying there... could this be my problem? I read online the air pump only works for a couple minutes on a cold start so I figured it wouldn’t be running as I am driving around with a warm vehicle an hour later. I can’t find out where this noise is coming from and the car seems ever so slightly sluggish. Any input would help. Thanks guys.
#2
Re: Longtube headers w emissions 95 z28
Wasn’t Pacesetter able to tell you the size of the AIR connections?
How did you “cap off” the AIR connections on the headers without them?
Are the EGR blockoff plates on the header and for the EGR valve well sealed? The typical aluminum plate for the EGT tube on the #8 primary may not seal well because of the use of only one bolt. Any leaks on that connection, or the AIR connections can screw up the O2 sensor readings. Just driving with open collectors screws the reading up also. The PCM will have to readjust once the Y-pipe was connected.
How did you “cap off” the AIR connections on the headers without them?
Are the EGR blockoff plates on the header and for the EGR valve well sealed? The typical aluminum plate for the EGT tube on the #8 primary may not seal well because of the use of only one bolt. Any leaks on that connection, or the AIR connections can screw up the O2 sensor readings. Just driving with open collectors screws the reading up also. The PCM will have to readjust once the Y-pipe was connected.
#3
Re: Longtube headers w emissions 95 z28
Wasn’t Pacesetter able to tell you the size of the AIR connections?
How did you “cap off” the AIR connections on the headers without them?
Are the EGR blockoff plates on the header and for the EGR valve well sealed? The typical aluminum plate for the EGT tube on the #8 primary may not seal well because of the use of only one bolt. Any leaks on that connection, or the AIR connections can screw up the O2 sensor readings. Just driving with open collectors screws the reading up also. The PCM will have to readjust once the Y-pipe was connected.
How did you “cap off” the AIR connections on the headers without them?
Are the EGR blockoff plates on the header and for the EGR valve well sealed? The typical aluminum plate for the EGT tube on the #8 primary may not seal well because of the use of only one bolt. Any leaks on that connection, or the AIR connections can screw up the O2 sensor readings. Just driving with open collectors screws the reading up also. The PCM will have to readjust once the Y-pipe was connected.
#4
Re: Longtube headers w emissions 95 z28
Sequence of events to me is still unclear. Did you drive the car with the EGR port on #8 primary open, or with the AIR ports open? Did you drive the car with the header collectors open? Did you drive the car with the EGR valve not on the intake manifold? It will not run correctly with any of those.
#5
Re: Longtube headers w emissions 95 z28
Sequence of events to me is still unclear. Did you drive the car with the EGR port on #8 primary open, or with the AIR ports open? Did you drive the car with the header collectors open? Did you drive the car with the EGR valve not on the intake manifold? It will not run correctly with any of those.
#6
Re: Longtube headers w emissions 95 z28
Any air entering the exhaust is not good. I got a set of 3 EGR blocking plates. As thick as the one for the #8 primary was, it didn’t look like an absolute seal could be achieved. I cut the “flange” (which is about 1/4” thick) off the header end of the corrugated tube, and used it to sandwich the blocking plate against the header connection, with sensor-safe ultra RTV between the blocking plate and the header connection. The plate for the EGR valve boss was installed with the EGR valve gasket and the RTV. The third plate for the corrugated tube against the intake manifold isn’t really necessary, but I installed it with RTV.
The AIR connections have to be sealed tight. In my case the 22mm-1.5 plugs were a nice tight fit, and I installed them with a copper gasket.
Check your header (head) bolts to insure they are tight. Hopefully you checked the header flanges to insure they are perfectly flat, and used a high quality gasket like the Felpro's. I've also had good luck with the Mr. Gasket copper-seal.
The AIR connections have to be sealed tight. In my case the 22mm-1.5 plugs were a nice tight fit, and I installed them with a copper gasket.
Check your header (head) bolts to insure they are tight. Hopefully you checked the header flanges to insure they are perfectly flat, and used a high quality gasket like the Felpro's. I've also had good luck with the Mr. Gasket copper-seal.
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