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Soolar
Apprentece
Saudi Arabia
8 Posts |
 Posted - Sep 24 2013 : 01:13:30 AM
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Good day
I have notice there are heavy amount of oil on secondary intake manifold.
I clean it out and run the engine for one hour. When I removed the upper
Intake manifold the oil back again. It's only on secondary intake. I run the engine with out
The upper intake and notice the secondary made sucking and blowing air at same time!
Is that normal? I don't know whats happened. Thanks |
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Soolar
Apprentece
Saudi Arabia
8 Posts |
Posted - Sep 26 2013 : 08:46:14 AM
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Up |
Edited by - Soolar on Sep 26 2013 08:48:30 AM |
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Aaron Cake
Administrator
Canada
6717 Posts |
Posted - Sep 28 2013 : 09:16:44 AM
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Totally normal.
It's due to intake reversion when the air stream hits the closed port, and bounces back to feed the opposite rotor. Mazda has designed this into the manifold since the early '80s.
The oil is mainly fuel leftovers as well as some metering oil pump oil. |
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Soolar
Apprentece
Saudi Arabia
8 Posts |
Posted - Sep 28 2013 : 2:40:23 PM
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Thanks Aaron. Ok, I have one question not related to our subject.
The secondary injectors are not working due load or over 3500 RPM.
I checked the primary injectors with LED LIGHT they work perfect.
But the secondary not. The wideband gauge shows 12.5 to 12.6 But while
It reach to 3500 RPM the fuel become lean 16.? and back firing due to the secondary
Are not working. Is there any sensor or switch can control the secondary
Injectors or just the ECU? Thanks again |
Edited by - Soolar on Sep 28 2013 2:43:31 PM |
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Aaron Cake
Administrator
Canada
6717 Posts |
Posted - Sep 29 2013 : 09:14:16 AM
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Is this a stock ECU or standalone?
If stock, the first thing to do is pull any codes and check to make sure the MAP sensor is working correctly.
If it's a standalone, check the settings for your secondary stage.
But note the secondaries won't activate until the engine has load. At light load only the primaries operate regardless of RPM. As I recall it's 3800 RPM and 2" of vacuum that stage the secondaries. |
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Soolar
Apprentece
Saudi Arabia
8 Posts |
Posted - Sep 29 2013 : 11:56:24 AM
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It is Knight Sports 4Beat FD modded ECU N3A7
I already bought a stock ECU and I am just waitting to be arrived
Soon. Thanks for reply. I'll updated you after checking with the stock
ECU. Thanks again |
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Aaron Cake
Administrator
Canada
6717 Posts |
Posted - Oct 05 2013 : 10:20:01 AM
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| I suspect it has something to do with the tune but if you are testing with the stock ECU be very careful if the car is modified. It may not provide enough fuel. |
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Soolar
Apprentece
Saudi Arabia
8 Posts |
Posted - Oct 09 2013 : 3:12:47 PM
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Ok, I'll take care. But I have one question, does the CAS has a relation with the secondaries?
thanks for your cooperation and kindly support.
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Soolar
Apprentece
Saudi Arabia
8 Posts |
Posted - Oct 13 2013 : 3:11:10 PM
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Still the same issue. I used the stock ecu, the primaries are firing
But when accelerated to 4000 RPM the secondaries not working
I changed the MAP sensor still the same. The TPS within the range specification
The both CAS resistance also within the range 1.18 ohm. I checked the codes
And got, 23,25,31,32,33,42,43,44,45,46. all of them are sensors and I already canceled them after rebuild the engine. are any one of them will effect on the secondaries??
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Soolar
Apprentece
Saudi Arabia
8 Posts |
Posted - Oct 13 2013 : 5:28:47 PM
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Sorry, all codes for solenoid valve
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Aaron Cake
Administrator
Canada
6717 Posts |
Posted - Oct 14 2013 : 10:39:37 AM
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| Sorry, but you're out of my knowledge area here. I really have rarely dealt with a stock ECU FD so I don't know under what circumstances it won't fire the secondaries. If you head over to http://www.rx7club.com you can post a topic in the FD forum. |
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Soolar
Apprentece
Saudi Arabia
8 Posts |
Posted - Oct 14 2013 : 12:04:36 PM
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Thanks for your reply. Finally I got it, the problem
Came from the ecu 4D ground input. There was a short
Curicit. Thanks again |
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Topic |
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Rx7 fd- oil on secondary intake manifold
