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How to check a sensor? (IPS)

 
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Old 01-11-2011, 05:39 PM
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How to check a sensor? (IPS)

Do you guys have a way to check sensors?

I'm having an idle issue, which isn't covered in the big idle thread. Few months ago I had a high and rough idle, cleaning the FICV fixed it, but now its back. It's no where as bad as it was, just a slight fluctuation. It isn't the FICV again, I've done the "take intake off, cover bottom hole with finger" test to see if it was a leak, its not.

It only does it when it wants to. For instance, when I go to work in the morning (15min drive) it wont act up, but on my way home, reaching my back streets, it will. It was fine on my way to daytona (30min drive), and all the way back until I hit my back streets again. It has to be warmed up, and then just feel like doing it, once it starts it wont stop.

Because of this weird behavior a lot is ruled out. Lines, leaks, coolant bubbles..etc are all out. The MAP sensor should be ok, for unplugging it turns the car off. What's left is the, excuse my terms, 'front' idle control valve (which I cleaned when I did the FICV so Im not putting my money on it), or the Idle Positioning Sensor? Its the sensor on the back of the intake, right next to the throttlebody, actually connected into the IM. Unplugging it while the car is acting normal does nothing, the only test left would be to unplug it while its fluctuating to see how it acts. Just gotta catch it when it does.

Any other idea's guys?
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Old 01-11-2011, 05:58 PM
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Re: How to check a sensor? (IPS)

Alright, the CORRECT name is the TPS.

From research it can go bad, can someone confirm the way my idle is that it IS that before I go buy one? Thanks.

NOTE: I do have a slug in power from 2.5k - 3.5k, if that helps mean anything.
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Old 01-11-2011, 06:04 PM
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Re: How to check a sensor? (IPS)

Can you feel the idle fluctuate through your brake pedal?
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Old 01-11-2011, 06:22 PM
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Re: How to check a sensor? (IPS)

I dont believe so, but I will pay attention next time.

It's not a high bounce, not like when the FICV was dirty. It'll go from regular idle (bout 900rpm) to 1.5k rpm. I'm not sure if this is normal, but it seems my idle (all the time) sticks at around 1.1k, then fall down a little more, when I go into neutral or have the clutch in and coast. I dont have to do anything, it'll fall on its on, and quickly, but it hesitates before it hits its regular idle.

Looking to replace the TPS now has me looking at aftermarket TB's. Hah. Since blox includes one with the purchase. Though this is still only a hunch. The old man will pick up an ome's (sp?) meter to see if the sensor is working properly.

On a side note, whats the best size TB for a stock h22 mani? Read a quick thing on wanting a pitch, from 70mm to 62mm - 64mm, but then they got into matching ports and the thread went dead, lost me.
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Old 01-11-2011, 07:28 PM
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Re: How to check a sensor? (IPS)

I've confirmed it, bad TPS. The "bucking" which happened today, along with the sluggish when accelerating and surging are enough to convince me to replace it.

If someone could point me into the direction of a throttle body size thread, I'd be thankful. I've read several threads, every post in each so far. It's worse then the topic on abortion. -.- Some say 70mm will give you the best without running the engine lean, others say stock jdm h22 is 60mm and not go to above 65mm if buying aftermarket. Then the topic of port matching comes up? Is the stock TB the same size as the IM? If so, how will going bigger help (unless the funnel effect helps)? How exactly DO you port match if thats the best way, take off the IM and have it bored?

-.- None of the threads explain these.
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Old 01-11-2011, 10:32 PM
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Re: How to check a sensor? (IPS)

I've come across the same problems researching it. Common sense would say that no matter how wide the TB or intake tube is, you're only gonna get as much air as the smallest part of the intake system will allow at it's bottleneck point. In our case, we could have a 4in diameter intake tube and a 70mm TB, but what good is that if the IM is ported to 60mm? If you're sucking air through a straw, and you put the end of the straw in a paper towel tube, you don't start sucking in more air than the straw will allow.

Then comes the arguments of 'charged' air, and the position of the intake cone and how it's location effects the temperature of the air, and the velocity at which it enters the engine, blah blah blah. Correct me if I'm wrong, but if you're not running a tune or a specific basemap on the ECU, then the stock ECU should automatically adjust timing and fuel input to compensate for the air intake volume and to optimize the efficiency of the engine.

Obviously, if you're considering upgrading the parts of the engine the breathe and exhale (like porting the IM, getting larger TB, less restrictive exhaust), you'll wanna look into tuning the car and possibly putting in larger fuel injectors to utilize all the air you're giving it, because I can see where the idea of running lean can arise. But after all I've read and researched, I believe you'd have to open the top end a helluvalot to even remotely worry about running lean, given the electronics in place to adjust for this.
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Old 01-11-2011, 11:21 PM
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Re: How to check a sensor? (IPS)

So what would you suggest lindso? And how much of a gain would it really be? I'll have a 3in exhaust, aem v2 intake, and eventually a tune and injectors. Will running a 65-66mm tb with the 60mm IM, create said funnel effect, and give gain? Any idea how much?
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Old 01-12-2011, 12:56 AM
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Re: How to check a sensor? (IPS)

All that combined without a tune, I'd say you'd be lucky to see 10HP at the wheels. I mean, the CAI might do 3hp, full exhaust (not including header) 5hp give or take. The tune is where you'll really see the modifications you've done shine-probably upwards of 20hp.

What I'll be doing which is supposedly the most cost-effective way, is trolling some Honda S2000 forums in hopes to catch them selling a stock TB. S2000 TB's stock have a 66mm inlet and 62.7mm outlet. I believe, but I'm not sure if they differ between the AP1 and the AP2 models, so that's something you'll wanna look into to double check my info if you're interested. I believe the AP2 houses a larger inlet and outlet- 68mm in and just under a 65mm out (64.9mm?).

I'm building my motor for N/A though, so if you're boosting, I'd say you'd probably want a bigger throttle body than that. I think Skunk2 makes the 70mm one.

Anyway, the intake manifold is what's become the question here, and you wont see much gain just by porting it to match a TB. You'll wanna port match it to your head also to get the most of it, or just completely replace it with a EuroR or Blacktrax IM. The EuroR just got it's prices raised so the BlackTrax suddenly is more appealing, as I've yet to research them both in depth to learn the pro's and cons of them. With the EuroR, word has it you gotta relocate sensors, and ultimately modify it yourself to get it to work, whereas the BlackTrax is actually a stock IM already ported and modified to one of several setups, which seems much more convenient.
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Old 01-12-2011, 10:51 AM
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Re: How to check a sensor? (IPS)

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Originally Posted by Terror View Post
Alright, the CORRECT name is the TPS.

From research it can go bad, can someone confirm the way my idle is that it IS that before I go buy one? Thanks.

NOTE: I do have a slug in power from 2.5k - 3.5k, if that helps mean anything.
If you have OBD-II, TPS is on live data. I'm sure you can use a multimeter to check though I don't know.

Yeah, it's on 11-74 on the manual. TPS is a potentiometer so measure voltage.

Last edited by mr0x; 01-12-2011 at 12:43 PM.
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