rb26 normal idle air flow???
rb26 normal idle air flow???
hello, i have a high idle problem, what is the normal idle air flow for rb26??, so i will know i have air leaks thanks
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Infinitiguy19
- Posts: 7787
- Joined: Sat Dec 22, 2007 4:58 pm
- Car: 1993 Infiniti Q45 188580 Miles
1994 Infiniti Q45a 240000 Miles
Re: rb26 normal idle air flow??? (auy_tong2)
A vacuum leak could very well cause a high idle among other problems...Look in the service manual for the info: http://www.nicoclub.com/FSM/rb/.
Are you talking about the MAF sensor voltage at idle....?auy_tong2 wrote:hello, i have a high idle problem, what is the normal idle air flow for rb26??, so i will know i have air leaks thanks
Re: rb26 normal idle air flow??? (Paul Wall)
i got a SAFC and AVCR installed, i can see how air flow is on idle, and also when increasing air....is that air flow comes from the maf sensor? or inside the throttle?
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HxC_Nismo
- Posts: 1036
- Joined: Sat Sep 23, 2006 10:26 am
- Car: '98 Nissan 240SX SE R33 RB26DET
'07 Nissan Titan SE
'05 Toyota Corolla - Location: Missouri
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Re: rb26 normal idle air flow??? (auy_tong2)
normal idle rpm on the rb26 is 900rpm unless you have big injectors like 800cc+. check for vacuum leaks, my vacuum during idle on my rb26 was 18inhg of vacuum. if you have no vacuum leaks and your fuel psi is 43.5 base psi then adjust the idle screw on your idle air control wich is located under the intake plenum in the middle of the plenum, and that should be able to get it close to normal.
here is a procedure on adjusting idle/ignition timing on rb's
Courtesy of http://justskylines.com
Quote:Engine Idle And Ignition Timing
Factory idle
Engine Transmission RPM
RB20E Manual 600RB20E Auto 650RB25DE Manual 650RB25DE Auto 650RB25DET Manual 650RB25DET Auto 650RB26DETT Manual 900All should be +/- 50rpm of the above.
To set Idle
Start car and warm up with steering wheel in centre, all lights and air con OFF, turn ecu diagnostic screw (on the ecu) anti-clockwise untill it bottoms out (rpm will drop if it wasnt bottomed out already). While car is running disconect the idle feedback plug (its the short wire comming out the BOTTOM of the TPS, unplug it). Go to the back of the inlet manifold and find the idle/aux air control solinoids, find the solinoid with the BROWN plug, on the opposite side of that solenoid theres is a large phillips head screw. Turn it anti-clockwise to raise RPM, clockwise to lower it. After rpm is set, plug idle feedback plug back in. If rpm need to be incresed in the future, turn the diagnostic screw clockwise. Maximum adjustment with the ecu screw is approx 250rpm because if its turned any further it puts the ecu into diagnostic mode.
R33 engine ignition timing
Engine Transmission Timing Degree @ RPM
RB20E Manual 20 @ 600RB20E Auto 20 @ 650RB25DE Manual 15 @ 650RB25DE Auto 15 @ 650RB25DET Manual 15 @ 650RB25DET Auto 15 @ 650RB26DETT Manual 20 @ 900
To set engine ignition timing
warm the car up, best to go for a drive to make real sure its wall warmed up. Check rpm and make sure they are correct for the motor, if not adjust it as above. DO NOT rely on the tacho, its not accurate. There is an RPM meter signal wire on a 2 contact plug which is by the battery/battery box behind the drivers side headlight or on the left strut tower, its a grey plug. Make sure steering is centered, lights and air con ALL OFF. Un plug idle feedback control plug (see setting idle if you dont know what it is). I have been told that this step ISNT needed but according to Nissan workshop tech I have it says to do it so im sure there is a reason for it.
For a non-powered timing light...
Rb20e - remove number 1 spark plug lead (very front one), plug one of the timing light leads into the spark plug lead and the other on to the top of the spark plug. Rb2xde/det - remove number 1 coil, plug one of the timing light leads into the spark coil and the other onto the top of the spark plug.
For a powered timing light
Connect the (+) and (-) leads of the light to the correct battery terminals. Rb20e - hook the signal clamp into number 1 lead Rb2xde/det - look at number 1 coil and the 3 wires going to it, 2 of the wires are power and ALL the other coils will have these 2 wires of the same colour, the other wire is the signal wire, thats the one you want. On or around the coil ignitor (series 1 r33) there will be a loop of wire the same colour as the signal wire to number 1 coil. Find this wire and hook the signal clap over this wire. On R33 series 2, the loop of wire is near the back firewall (no ignitor on series 2). If you cant find it on either seres1 or 2, cut back the tube that covers the 3 wires going to coil 1. Clamp the signal wire here. Restart car before it gets cold again. At this point the timing light should be flashing. Aim it at the crankshaft. Looking just above the crankshaft, at about 2 o'clock on the timing belt cover, there is a fixed mark. The marks that will be seen with the timing light on the crankshaft have to be lined up with the fixed mark on the belt cover. On the crank shaft there are 7 marks, 0 to 30 deg so each mark after 0 deg represents 5 deg, 0 deg is coloured orange and all the rest are white. Rb20e - undo the bolts around the dizzy and rotate to get desired ignition timing. Move clockwise to advance, opposite to retard. Rb2xde/det - undo the 3 bolts holding the cam angle sensor (end of exhaust cam) and rotate to get desired ignition timing. Move anti clockwise to advance, opposite to retard. Do bolts back up, remove light etc.............
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here is a procedure on adjusting idle/ignition timing on rb's
Courtesy of http://justskylines.com
Quote:Engine Idle And Ignition Timing
Factory idle
Engine Transmission RPM
RB20E Manual 600RB20E Auto 650RB25DE Manual 650RB25DE Auto 650RB25DET Manual 650RB25DET Auto 650RB26DETT Manual 900All should be +/- 50rpm of the above.
To set Idle
Start car and warm up with steering wheel in centre, all lights and air con OFF, turn ecu diagnostic screw (on the ecu) anti-clockwise untill it bottoms out (rpm will drop if it wasnt bottomed out already). While car is running disconect the idle feedback plug (its the short wire comming out the BOTTOM of the TPS, unplug it). Go to the back of the inlet manifold and find the idle/aux air control solinoids, find the solinoid with the BROWN plug, on the opposite side of that solenoid theres is a large phillips head screw. Turn it anti-clockwise to raise RPM, clockwise to lower it. After rpm is set, plug idle feedback plug back in. If rpm need to be incresed in the future, turn the diagnostic screw clockwise. Maximum adjustment with the ecu screw is approx 250rpm because if its turned any further it puts the ecu into diagnostic mode.
R33 engine ignition timing
Engine Transmission Timing Degree @ RPM
RB20E Manual 20 @ 600RB20E Auto 20 @ 650RB25DE Manual 15 @ 650RB25DE Auto 15 @ 650RB25DET Manual 15 @ 650RB25DET Auto 15 @ 650RB26DETT Manual 20 @ 900
To set engine ignition timing
warm the car up, best to go for a drive to make real sure its wall warmed up. Check rpm and make sure they are correct for the motor, if not adjust it as above. DO NOT rely on the tacho, its not accurate. There is an RPM meter signal wire on a 2 contact plug which is by the battery/battery box behind the drivers side headlight or on the left strut tower, its a grey plug. Make sure steering is centered, lights and air con ALL OFF. Un plug idle feedback control plug (see setting idle if you dont know what it is). I have been told that this step ISNT needed but according to Nissan workshop tech I have it says to do it so im sure there is a reason for it.
For a non-powered timing light...
Rb20e - remove number 1 spark plug lead (very front one), plug one of the timing light leads into the spark plug lead and the other on to the top of the spark plug. Rb2xde/det - remove number 1 coil, plug one of the timing light leads into the spark coil and the other onto the top of the spark plug.
For a powered timing light
Connect the (+) and (-) leads of the light to the correct battery terminals. Rb20e - hook the signal clamp into number 1 lead Rb2xde/det - look at number 1 coil and the 3 wires going to it, 2 of the wires are power and ALL the other coils will have these 2 wires of the same colour, the other wire is the signal wire, thats the one you want. On or around the coil ignitor (series 1 r33) there will be a loop of wire the same colour as the signal wire to number 1 coil. Find this wire and hook the signal clap over this wire. On R33 series 2, the loop of wire is near the back firewall (no ignitor on series 2). If you cant find it on either seres1 or 2, cut back the tube that covers the 3 wires going to coil 1. Clamp the signal wire here. Restart car before it gets cold again. At this point the timing light should be flashing. Aim it at the crankshaft. Looking just above the crankshaft, at about 2 o'clock on the timing belt cover, there is a fixed mark. The marks that will be seen with the timing light on the crankshaft have to be lined up with the fixed mark on the belt cover. On the crank shaft there are 7 marks, 0 to 30 deg so each mark after 0 deg represents 5 deg, 0 deg is coloured orange and all the rest are white. Rb20e - undo the bolts around the dizzy and rotate to get desired ignition timing. Move clockwise to advance, opposite to retard. Rb2xde/det - undo the 3 bolts holding the cam angle sensor (end of exhaust cam) and rotate to get desired ignition timing. Move anti clockwise to advance, opposite to retard. Do bolts back up, remove light etc.............
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