Need Pulse Air system for 87 YJ 4.2L - JeepForum.com

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post #1 of 19 Old 10-26-2011, 06:40 PM Thread Starter
cpoliv2
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Need Pulse Air system for 87 YJ 4.2L

Hello all, Ive picked up a used 87 YJ that runs pretty rich and doesn't pass emissions. Any idea where i might pickup a used Pulse Air system? PO removed everything. Still have the charcoal cannister. The temp sender unit has been disconnected, can't find the wire to hook it up. This also causes my stepper motor to not work. Any idea where to find that wire? I heard it was tan on the 87?

Jeep runs great at speed, sputters some at idle. One mechanic told me definitely an intake manifold leak when he looked at it. Think thats the sputter prob? Ive also heard an engine running rich could clog the cat. Exhaust blows pretty well at the tail pipe, but can actually feel the sputter.

For reference, sounds exactly like this video, only the sputter noise is more frequent.


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post #2 of 19 Old 10-26-2011, 07:28 PM
Tang87
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The pulse air system is a real pain in the butt to mess with. Mine the tube was rusted all the way through the pipe making it just leak out the exhaust. I pulled my valves and everything on mine when I went with a MC2100...I remember I've found the tube, but it was expensive just for emissions that I don't need to pass.
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post #3 of 19 Old 10-26-2011, 07:32 PM
MaddBones702
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You would be better served by ditching that stuff and getting the MC2100 and doing a nutter bypass.
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post #4 of 19 Old 10-26-2011, 07:33 PM
Tang87
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post #5 of 19 Old 10-26-2011, 08:02 PM
dancytron
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Unless you have visual inspection in CO that means you have to have the pulse air system, I would not try to put it back. The computer/sensor controlled part of the emissions system is probably totally trashed at this point.

You should look at this http://www.jeepforum.com/forum/f8/ho...bypass-522262/

I'd try to get it to pass without replacing the carb by fixing the vacuum leaks, tuning it up with better parts http://www.jeepforum.com/forum/f8/i-...nitive-669495/ and getting all the non-computer based emission components working. See this for what controls what: http://home.sprynet.com/~dale02/control.htm

If you want to (or have to) get the old computer based emission system going, this explains it

http://home.sprynet.com/~dale02/list.htm
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post #6 of 19 Old 10-26-2011, 08:23 PM
Chris
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I may still have the whole set up off mine, if I do it's your for the cost of shipping. I'll look tomorrow.
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post #7 of 19 Old 10-26-2011, 08:49 PM
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WOW Chris!!! You are incredibly generous!

CPO is in metro-Denver and absolutely requires a complete system subject to visual inspection and they're quite touchy about it. Considering all of the components required your offer is quintessential Perfection, SIR!

CPO ... two items which may be of interest to you.

First, the seller of a Colorado vehicle must provide the buyer with an emissions certification by state law. If the seller did not do so, and you purchased the vehicle in good faith to be operated on public roads, then you have every right to void the sale. Ask any auto dealer.

Second, should you chose to accept Chris' offer I'll help you install and tune the system/carb which can be done in a day if all the parts are there. I've lots of spare parts as well so it shouldn't be an issue. I'm in Conifer with a fully compliant '89 DD so it's no big issue.

Glad to contribute, in support of Chris, if I can.
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post #8 of 19 Old 10-26-2011, 08:52 PM
Chris
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I am gonna call the guy that bought my motor to see if I left it attached or not, If he doesn't have it I still do but my junk pile is quite large.
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post #9 of 19 Old 10-27-2011, 08:25 AM Thread Starter
cpoliv2
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Thanks for the prompt replies! Tang/Madbones, I only wish I could do away with it but I'd have to move out of this area! Dancy I took it in a couple times and it did fail emissions and visual, said I need a air pump at least.

Wow Chris if you can get it that's amazing! Thank you very much just let me know what you need for shipping! then I'm up for a drive to conifer, you open weekends unfocused?

There's a few junkyards here with cj's and yjs from that period. Can maybe get a few parts we are missing there if needed.
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post #10 of 19 Old 10-27-2011, 03:48 PM Thread Starter
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So went to U Pull & Pay here in Denver, had an 88 and a few other 4.2's. I made the mistake of mentioning smog pump and they said no can't take any emissions equipment off the engine? Wow didn't know a junk yard was so stingy!! So if anyone ever goes for this system just say air valves etc. Even mention smog pump and you are SOL. Doubt they would even know what the Pulse air system is if they saw it!
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post #11 of 19 Old 10-27-2011, 04:02 PM
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see what this guy might have for sale.

http://www.jeepforum.com/forum/f12/c...ic-qs-1281241/

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post #12 of 19 Old 10-27-2011, 07:53 PM
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Hi CPO, yes weekends are preferred. After reading your posts I'm a little concerned that you might not know what you're looking for. There is no smog pump on your yj.

The link to sprynet that dancytron provided pretty much explains the entire system. You will need: a factory air cleaner assembly, the metal tubes which run to the cat and the exhaust header, the pulse check valves (don't get used ones, they're most likely bad and will mess up the carb and you won't pass anyway), the pulse air valves (again, get new ones), the three pulse air vacuum solenoids on the valve cover between the air cleaner and the firewall, the 10-4 vacuum switch on the firewall, the EGR and the EGR CTO valve, the computer (mounted on top of the heater assembly near the shift lever), a vacuum reservoir (sphere about the size of a softball) mounted on the passenger fender under the battery, the pulse air decel valve, the wiring harnesses, and about eight hundred feet of vacuum line (just kidding.)

Here's a suggestion: Would you like to survey your system first in order to find out what you'e got and what you need? That'll probably help in the long run.
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post #13 of 19 Old 08-27-2015, 09:28 AM
GFox
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An old thread, but a good source for Pulse Air Tubes is http://teamcherokee.com. They have tubes and valves for CJ, YJ and Cherokees. They are not OEM, but are much cheaper than anything else I've found.
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post #14 of 19 Old 08-27-2015, 10:18 AM
mike134
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I highly recommend a fuel injection upgrade if you are having trouble with emissions. Howell TBI and Mopar MPFI are both legal replacements for the carburetor systems due to the considerable decrease in smog emissions by fuel injection. You will get a 50 states legal CARB sticker to place under the hood which tell emissions inspectors to ignore the exempted modifications.

As an added benefit of fuel injection, you'll get a very slight increase in peak horsepower and a very large broadening of the horsepower curve across the RPM range. It will also be better at changing altitudes and cold starting.

Howell TBI (~$1300): http://www.4wheelparts.com/Performan...FVGAaQode-4D8Q

MOPAR MPFI (~$2700): http://www.hesco.us/shop.asp?action=...5#.Vd8q4_lVhBc
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post #15 of 19 Old 08-27-2015, 11:29 AM
kgbeast
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rockauto.com has few parts for the pulse air, but not a complete kit. I bought the check valve from them and it was only $11, but it is the only thing I needed. If you to get all new, it will cost you probably close to $400. Unless you get an old system from someone on this forum or from a yard or graigs list parting-out add, it will probably best to go with mike134 advise ^^^ and get TBI kit. There are TBI kits that are just over $900 and probably legal in your state. MFI kit is a better performer, but it will cost you $3000 by the time you get all that in... and if your core is tired, it is just a bad spending. TBI will give you all you need for much less.

This said, if your cat converter if done with, even the new motor will not help, so keep in mind that cat converter might be a project for you in the near future regardless which route you go. By the way, your sputter is not caused by bad cat converter as that would have affect your idle and all across the border performance. The fact that you solenoid does not work, will have effect on the emission test as if the motor runs too rich, there will be loads of HC, if it is too lean, it can run too hot and there can be loads of NOx... either way, you loose. Carter is not a great carb to run without the active fuel calibration (which is what the solenoid, ECU, and O2 sensor and some other emission junk is for). Nutter bypass will make the motor run better with the Carter carb, but I doubt it will be emission test compatible unless you dial it in for the 1600-1700rpm range to be perfect, but not sure how you can do that with no emission readers.
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4.2 , emmision , exhaust manifold , pulse , smog

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