Did the 90-92 3.1 motors have an air pump when installed on auto trans cars??

 

Mine does

 

Yes. Although I have yet to see any documentation to prove it. Seems they can disappear and it can't be proved that it should be there.

RBob.

 

does that connect to the cat? cuz i don't have that

 

Thanks Gang, the reason I asked is because the ('90) Factory Service Manual (Helm) shows the serpentine belt arangement for the A/T cars to have an Idler Pulley instead of an air pump.
It shows the air pump setup (including the air control solenoid) as manual trans ONLY. It also shows the Oxy. sensor installed on the R. side manifold where my air pump discharges into. I have a '90 auto trans motor (At least that's what the salvage yard said it was).

Any ideas as to what's up??

Also, where can I find the serial # on my engine?

Big ThanX

 

On the '92 it goes into the top portion of the pass side exhaust manifold. Just a single tube.

RBob.

 

My '92 Helms manual is the same. Air is on MANUAL cars only (emphasis is theirs). It doesn't show the O2 there, actually I don't think it shows it at all. But it is in the Y pipe right after T.

Not sure about the serial number. I think the 1st section shows where they are located on the vehicle though.

RBob.

 

Thanks for both posts RBob, when you posted the above I thought you were kind ‘a kidding but I get it now.

So what is your opinion on this matter? :
I’m using this 3.1 to replace the very tired, 2.8 carbed motor on my ‘86 Cherokee. The 3.1 is connected to the proper 700R4 trans that came with it. I’ll be running the complete F.I. system including all sensors, VSS, catalytic converter etc (I want this thing to run like a factory install or better). Because of the engine swap & the fact that I just moved to California, after I finish the install, I’ll need to go to a DMV referee station to smog the Jeep before I can register it…….see where I’m going with this? If there is no documentation to prove that the motor came with an air pump & diverter valve what do you think are my chances of being able to get away with not running it? Do you by any chance know “anyone, perhaps a friend” that might have removed the pump?
I would like to know if there is a noticeable increase in power, negative/positive side effects? Etc, etc, etc.

I NEED all the H.P. I can get!!

ThankX

 

Hum, I would like to see that idler pully set up pic. And wonder what that part number(s) would be


I think it would have a posative effect. Less roating mass. Plus that air pump only works at certain times. Not all the time.

 

Well Dale, this is the best I can do. It's a copy of the Helm '90 manual. It be great if we could get a picture from a board member that has this setup on their car. My local dealer's parts dept. is not very friendly so I'd like to get as much info as posible before I go & try & get the parts. Notice- the EGR valve on this setup is the older style non-electronic type, so could the whole setup be from a pre '90's motor?

 

Thats a decent pic to go buy.

your right, that looks pre digital egr style.

I wonder if that could be on older 2.8l, not 3.1l. Hum

I would still like to give it a whirl.

 

I have a 1992 3.1 liter automatic Firebird, and it does have the smog pump. I will attach an image that shows it. Although it doesn't show too much detail. As TomP might say, the idea is to use the block, heads, and possibly the oil pan from the newer 3.1 liter motor. Use your old intake, pulleys, exhaust manifolds, emission controls, etc. In other words, make the new 3.1 liter look just like the 2.8 liter that you have. The guys at the DMV will never know the difference, since it is still a 60 degree V6, and they aren't going to spend the time looking at it that close. GO get it smog checked and tagged, and be done with it. In other words, don't give them any reason to suspect it has been tampered with. Just my opinion on it. Lucky, I live in an area where there is no pollution control enforcement.

 

Thats almost identical to what my engine looks like, except that little braided hose that goes infront of the throttle body

 

Thanks pontiacguy1, good advise. I would still like to see a pic of either a 2.8 or 3.1 with the serpentine setup and –no- A.I.R. Pump.

PS- Whutzup with the braided ss line going into your TB? Is it just for “LAUGHS” ??

 

Yes, if you notice, there are two solenoids on the fender that control the system. The 'ha ha' gas goes in through that stainless steel braided line. I have it set up for 75 HP gain at about 800 PSI bottle pressure. When it has been really hot outside and the car has been sitting in the sun all day, the pressure goes up to around 1100 PSI, and the gain is probably about 100 HP. The engine is 100% stock otherwise. I have had this system on there since spring 1996, have probably run about 25 bottles of gas through it, and have never had a problem.

 

Cool, thats what I thought it was.

What kit, parts #'s etc because I would like to stick that on my 3.4l down the road. But prob just a 50 shot, maybe 75 once I get a little braver.

 

Yeah Baby!!!
Reliable to boot! Who makes that kit?

 

Someone has Laughing gas!....

 

I don't remember the part number of the kit I used for the car. It's just been nearly 7 years since I put it on. The thing is: Do not go get a kit for a 60 degree GM V6, unless you really want to throw away more than 100 bucks. The kit I used was for an 88-95 5.0 Mustang. The fuel injection systems are pretty similar between the 5.0 'stang and the MPFI on the V6 f-bodies. I got the adjustable kit for the 5.0, and it is adjustable from 50 to 150 HP. I called NOS (not noss or naws)tech support to get jet recommendations to set it up for 75 HP. It has worked out really well. Summit has been advertising a non adjustable 75 HP NOS brand nitrous kit for 5.0 Mustangs for about 450 dollars. The kit that they have for the V6 is about 600 dollars, If i remember correctly. Hope this helps you guys.

 

 

pontiacguy1, thanks for the info, just one more question. Are you using some sort of plate adapter in front of your throttle body for the nitrous nozzle or did you just tap & thread it right into the T/B lip?

ThanX again, :hail:

 

The jet is actually contained near the solenoid. All that is in the throttle body is the tip, which is basically just a flow redirector. It takes the spray and aims it right at the throttle plate. It is screwed into the lip of the throttle body. I believe it was a simple 1/8-27 NTP thread that needed to be tapped into the aluminum. It could easily be plugged off if the system were removed.