Larger AFM for a 280zx
Posted 10 May 2011 - 08:56 PM
Try removing the plug from the air flow meter and look at the terminals to make sure that they are still in the right position, some times when you remove them and replace them the terminals slip back into the plug.
Also check the wiring behind the plug to make sure you don't have a broken wire.
Don't replace any other parts at this stage, as the fault was introduced with the air flow meter.
Posted 10 May 2011 - 09:42 PM
Sorry to hear you have a couple of issues.
I didn't have a problem with the throttle body side of the AFM size, cause I had a larger 70mm throttle body from a Commordore on there, Galderdi you mentioned that the throttle body side of the Toyota AFM was 90mm, this doesn't sound correct, I'm sure mine was 75mm to 80mm no more, I might remeasure it tomorrow and check.
Does the Toyota AFM look the same as my pictures ??
Not sure why you have the idling problem, did it run ok ??
Maybe check the water temp sensor for the ECU, I had this problem recently when the plug came loose, and the car wouldn't idle, was extremely rich.
Posted 11 May 2011 - 10:42 AM
Posted 11 May 2011 - 06:07 PM
Posted 11 May 2011 - 06:46 PM
Posted 11 May 2011 - 07:07 PM
Galderdi, you might need to adjust the coil spring if it is hunting, maybe running to lean or rich at idle, first I would try the idle air adjuster on the Toyota AFM there is a cap in the same position as the 280z AFM has for adjusting the air flow that goes thru the AFM for idle air ratio, if you haven't drilled out that cap, it's time to do so..
Better still if you had and Air Fuel gauge, but you will tell straight away when you adjust the screw..
I wouldn't be cutting and crimping just yet, pull the original plug to the AFM on the 280z loom apart and check it out. Try a multimeter test for resistance on all pins. Then maybe try and test the wires back to the ECU, maybe a wire broke when you were first changing the AFM.
Are the injectors clicking ??
Is there voltage at the AFM when cranking ( test the larger prong in the Toyata AFM with a multimeter, should be a small voltage there when cranking 2 - 4 volts ??
Have you checked the water temp sensor.
Let me know how you go guys.
Posted 15 May 2011 - 12:16 PM
Posted 15 May 2011 - 08:07 PM
Posted 16 May 2011 - 10:52 AM
Posted 16 May 2011 - 05:13 PM
Yeah my performance was much better over 4000rpm but also idles much better.
Still love the new AFM.
Not sure why the rewiring had to happen, my loom has only five pins that went directly in without change.
I know the Toyota AFM has two additional pins for the fuel pump cutoff but that doesn't come into play on my loom.
Glad to hear you've got it going..
Now it's time for a Jaycar Digital Fuel Adjuster, I have had one for a while, and gives me lots of control over the AFM to ECU voltages..
Posted 16 May 2011 - 06:24 PM
I will be able to answer with a direct comparison of track times after Saturday. The Toyota unit is significantly bigger. The smallest part of the air passage with the flap fully open is (by looks) around 15-20% bigger. So I suspect performance would be unchanged until you exceed the air flow through the smallest part of the nissan unit. In other words it should extend the power at full revs with full throttle.
Not quite Greg, though times will give you an indication if the new AFM has made a difference, but there are way too many variables for a direct comparison of performance. Also will depend on what other mods you have done since the last day out and even down to the number of heat cycles through the tyres you are using.
Posted 16 May 2011 - 09:13 PM
By the way I had the bonnet open on my 93 cruiser tonight and the AFM in there looks the same as the 99 camry unit.
Posted 17 May 2011 - 07:56 AM
Looking at the weather and the rain we have had, don't be suprised if times are a little slower as the track may not have a lot of rubber on it. Air and track temp should be good for the day though.
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