Paging: CHOCO!

[Bruce Dorsi]

Choco, I remember you asked a question about the threads on GM Manifold Air Temperature Sensors, but it was buried deep in a non-related thread.

I was unable to find your question until Brootal revived that thread this AM.

If you haven't already received the info you sought, here is some info.

GM # 25037334 MATS has 3/8"-18 thread and two terminals. ...It was used on 94-98 Chev & GMC trucks, 90-93 Geo, 94-95 Honda, 93-95 Isuzu.  .......NAPA # TS4031

GM # 96064749 MATS has M12 x 1.5 threads and two terminals.  ...It was used on 91-92 Chev & GMC trucks, 91-96 Geo, 96 Pontiac. ......NAPA #TS4030

GM # 25037225 MATS has 3/8"-18 thread and two terminals.  ..It was used on 88-92 Buick, 88-92 Chev pass, 88-93 Chev & GMC trucks, 88-92 Olds, 88-91 Pontiac.  ......NAPA # TS5102

There are three other MATS which were commonly used on GM products, but they are unthreaded.  They also have the two terminal connection.

This info is from a 1998 NAPA-Echlin catalog.

Edelbrock's Pro-Flo EFI system used a GM # 25036751 MATS, but I do not have any info on that part #.  ....It is threaded, but I am unable to say what size threads it has.

BTW, that 3/8"-18 thread is pipe thread.  .....It does not specify if it is NPT (tapered threads) or NPS (straight threads).

There are no resistance values given for these MATS.  ....Do you require a certain value, or is this compensated for in the programming?

[Brootal]

Ummmm...glad to be of service.

Which post was it? The "rude words" one?

Trust Choco to change the subject!

[choco]

Hey, thanks, Bruce, that's what I'm after. I don't care what the values are as I can change the maps in the software using Kalmaker on a Delco ECM. My problem was that I didn't want to drill and tap extra threads, or re-tap imperial threads to metric in my Offenhauser Tunnel Ram which is set up for MPFI in my 360 Mopar. I have a plethora of sensors, but I can't tell the difference between a Metric or a NPT thread just by looking at them. It's the CTS and MAT that I need.
Thanks again.

[Bruce Dorsi]

I have a plethora of sensors, but I can't tell the difference between a Metric or a NPT thread just by looking at them.

Do you Aussies have "thread gauges?  ....These tools are used to identify the pitch of threads for metric and imperial threads.  

It's the CTS and MAT that I need.

I have some info on CTS's also.  ...How can I help?

[bcal]

Choco, if it's tapered it will be either NPT or BSP. Most probably NPT. Some BSP/NPT theads are interchangable. From memory the 3/8BSP male will go into a 3/8NPT female but not the other way round.
Or was that the other way round
Anyway both are fairly course threads and the US tend to use NPT while UK and Europe tend to use BSP. Here in Oz get both :evil:
The Holden sensors I got were fine pitch (can't remember the number, 1mm I think) 12mm for the CLT and 14mm for the MAT. Both were parallel and much finer than the tapered type threads.
The O2 sensor was 18mm.