NB Guys running the ms in parallel.... - Miata Turbo Forum - Boost cars, acquire cats.

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Old 05-01-2008, 09:40 PM   #1
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Default NB Guys running the ms in parallel....

Do any of you get a CEL for the crank pos. sensor? I know the thing must still work if the tachometer still works but im wondering if the ecu is able to tell that its not controlling the timing anymore?
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Old 05-01-2008, 09:53 PM   #2
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I ran MS in parallel for about 2 weeks with no CEL. Then I removed the narrow band to install my wideband and it has been on ever since. The answer is no, the ECU will never know it's not controlling timing or fuel.
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Old 05-01-2008, 10:06 PM   #3
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I don't get any CEL's except for the rear O2 sensor being taped up under my car

Check the gap on your crank sensor. If it's gapped to far out and the stock ECU is getting bad readings it might throw a code.
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Old 05-01-2008, 10:29 PM   #4
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wouldnt the tachometer not work then?
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Old 05-01-2008, 10:56 PM   #5
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Wouldn't you check it to see if the gap is messed up?
A CEL can be caused by a single event, it doesn't mean its a constant issue, like a single misfire. How many times have you reset the code to see it come back again?
You have an issue that I don't and neither do others, so it's hard to trouble shoot a non-common issue.
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Old 05-02-2008, 12:50 AM   #6
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gap is fine....reset it like 5 or 6 times...starts up and within a few seconds comes back with same code (p0335 crank. pos. a circuit malfunction)
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Old 05-02-2008, 12:53 AM   #7
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FWIW, I run .020 gap on my crank position sensor. I used a caliper to measure different business cards till I found one that was .020, then stuck it between the tip on the wheel and the sensor pushed the sensor till it hit the card, tightened the bolt, removed card. Spun the motor and no interference. Then fired it up. What gap are you running?
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Old 05-02-2008, 01:06 AM   #8
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i had it at .016


i'll go try .020
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Old 05-02-2008, 01:14 AM   #9
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same...

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Old 05-02-2008, 01:38 AM   #10
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whats the CEL code?
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Old 05-02-2008, 01:39 AM   #11
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p0335-crank. pos. circuit malfunction
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Old 05-02-2008, 01:41 AM   #12
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Weird. Dunno but are your plugs and wires good? I dunno if that could ever cause that code though. When did it start throwing this code? Right after your MS install?
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Old 05-02-2008, 01:48 AM   #13
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plugs are fairly new, no more wires (thanks cops ) and im really not certain when it started...the cel was on from the start from the maf removal. Today i put in a gm map sensor to give it a fake signal and when i went to clear the codes i saw the crank sensor one in there too.
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Old 05-02-2008, 03:02 AM   #14
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No issues here as well, only the occasional rich/lean code.

Jim
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Old 05-02-2008, 03:21 AM   #15
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you need to keep the MAF plugged in. that might be the reason for the codes. plus, your alternator wouldnt charge your battery unless you swapped to an older model alternator.
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Old 05-02-2008, 07:10 AM   #16
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Without the MAF in place, the stock ECU can't idle well (the idle oscillates too much) if you still have the idle valve under stock ECU control.
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Old 05-02-2008, 01:24 PM   #17
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Quote:
Originally Posted by badboy88000 View Post
plus, your alternator wouldnt charge your battery unless you swapped to an older model alternator.
If you mean the MAF has to be plugged in for the alternator to work that is not correct based on my experience. My MAF is completely out of the car and my alternator works fine.
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Old 05-02-2008, 01:28 PM   #18
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Quote:
Originally Posted by Reverant View Post
Without the MAF in place, the stock ECU can't idle well (the idle oscillates too much) if you still have the idle valve under stock ECU control.
Do you mean just plugged in, or plugged in and actually in the intake plumbing? I have had trouble getting the idle stable at anything above 13:1 and my MAF is not plugged in (removed from the vehicle). Reinstalling it might be worth a try.

I believe Chad (cjernigan) has his in the car, plugged in, but not installed in the intake flow. As far as I knew that was just to avoid a CEL, not idle related.
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Old 05-02-2008, 01:34 PM   #19
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Actually i've had my MAF installed in the intake path since I bought the car. I also had it plugged in to avoid CELs. I don't know how it would affect the idle.
I do know the fequency of the NB valve if you want to do some idle control, it sounds like we might need to if we want to successfully remove the MAF. I plan to leave it out with the new turbo setup so i guess i'll be using that idle mod after all
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Old 05-02-2008, 01:55 PM   #20
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hmm, dont know then
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