46mm AIS and TPS in 52mm TB?

[John B]

I put a 52mm TB on my '91 Shadow and have had erratic idle ever since. Is using the 2.5 AIS and TBI sensors causing a problem? Should I have used the sensors from the 52mm TB?

[jayspartanburg]

I believe It's the ais

[86Shelby]

IIRC the pintle on the 52mm AIS is larger than the one for the 46mm AIS. I could see it causing high idle issues.

[4 l-bodies]

IIRC the pintle on the 52mm AIS is larger than the one for the 46mm AIS. I could see it causing high idle issues.
+1 on this^^^ TPS is the same.

[supercrackerbox]

Good to know. I'll have to track one down for the GLHS.

[John B]

IIRC the pintle on the 52mm AIS is larger than the one for the 46mm AIS. I could see it causing high idle issues.
I wonder if I could swap out the pintles and avoid modifying wiring?

[turbodaytona87]

I wonder if I could swap out the pintles and avoid modifying wiring?

I just swapped wiring on mine. It's probably easier to solder 3/4 wires than it is to change the part (if it's even possible). You could probably track down a connector and make a conversion harness so you don't have to hack up the original harness, but I don't know if that connector would be available anywhere.

Another thought I had is if the pins are the same, but the connector is different, you could remove the pins from the old connector and stick them in the new connector

[turbovanman²]

Why would you change connectors? the 46/52 have the same, except the TPS connector is different on 91 and up IIRC.

I run my stock 46mm AIS on the 52's I've installed and currently the 58mm with no issues, something else is amiss with your setup. Did you adjust the throttle plate opening?

[John B]

Why would you change connectors? the 46/52 have the same, except the TPS connector is different on 91 and up IIRC.

g?

The AIS that was on the 52mm has a different pin configuration, so my T1 wiring won't plug into it. The male/female is reversed between the two AIS sensors. Yes, I did the remove brake vac hose, let it settle, remove AIS connector, set idle manualy procedure. The idle problem is oscillation from 1000 to 2000 over and over. It lopes in gear at low speed the same way.

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I just swapped wiring on mine.
Did you have any idle problems before you adapted your wiring, ie, did you try it first with the 46mm AIS?

[jayspartanburg]

I don't remember if it did it in gear but I had the same problem. Don't know what stuff varies by year, but the Lil plunger on the 52 was different than the one that came with the used 52 I bought. Replacing with a ais that came off a 52 and problem went away. I redid the wiring because I was going from 87 t1 to 87 t2 so it was necessary in my case.

[John B]

I don't remember if it did it in gear but I had the same problem. Don't know what stuff varies by year, but the Lil plunger on the 52 was different than the one that came with the used 52 I bought. Replacing with a ais that came off a 52 and problem went away. I redid the wiring because I was going from 87 t1 to 87 t2 so it was necessary in my case.
OK, thanks! I'll give the 52mm AIS a try.

[turbodaytona87]

The AIS that was on the 52mm has a different pin configuration, so my T1 wiring won't plug into it. The male/female is reversed between the two AIS sensors. Yes, I did the remove brake vac hose, let it settle, remove AIS connector, set idle manualy procedure. The idle problem is oscillation from 1000 to 2000 over and over. It lopes in gear at low speed the same way.

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Did you have any idle problems before you adapted your wiring, ie, did you try it first with the 46mm AIS?

It's been a few years so this might not be 100% correct, but I think mine was fine (I used the entire 52mm TB). I did have an issue with the TPS wiring not matching up and that's why I switched that. I think the AIS was fine.

[turbovanman²]

The AIS that was on the 52mm has a different pin configuration, so my T1 wiring won't plug into it. The male/female is reversed between the two AIS sensors. Yes, I did the remove brake vac hose, let it settle, remove AIS connector, set idle manualy procedure. The idle problem is oscillation from 1000 to 2000 over and over. It lopes in gear at low speed the same way.

- - - Updated - - -


Did you have any idle problems before you adapted your wiring, ie, did you try it first with the 46mm AIS?

Weird, what did you get the throttle body off? I don't recall 52's having different AIS connectors, only the 58's.

[John B]

Weird, what did you get the throttle body off? I don't recall 52's having different AIS connectors, only the 58's.

It's off a 3.3 V6. My '92 Voyager 3.3 has the same set up.

[turbodaytona87]

It's off a 3.3 V6. My '92 Voyager 3.3 has the same set up.

I looked at my wiring, and the AIS wiring was left alone, it's the TPS wiring I had to change to the proper connector. But I'm almost certain I had issues with the smaller AIS and had to use the 52mm TB's original AIS.

[supercrackerbox]

Is the TPS different as well? The 52mm I have on deck for the GLHS is bare; I'll need to get the TPS and AIS for it.

[Force Fed Mopar]

All the AIS's I've ever had have had the same plug. The plunger cone is smaller on all the 46mm AIS's I've ever seen also. It basically won't seal the hole properly and creates a vacuum leak.

[John B]

Painful mea culpa here. I got it all wrong. the TPS wiring is different because the connector has a notch in a different location, but the AIS connector is the same, only clocked at a different angle. The 46mm harness connector will plug into the 52mm AIS with little problem, only slight re-positioning of the wire harness. I apologize to all for posting bad information.

[supercrackerbox]

Now, do the TPS sensors for the 46mm and 52mm actually read differently? I mean, both throttle bodies have the same 90° travel, both have the same mounting and flat for the TPS. The purpose of the TPS is simply to read incremental voltage to tell the computer how far the blade is open . . . We've established that the 46mm AIS won't work with the 52mm throttle body due to a physical difference. But is there any reason the 46mm TPS won't work correctly with the 52mm throttle body?

[86Shelby]

TPS will interchange. Just use the one that hooks up to your wiring harness.

[supercrackerbox]

Excellent.