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Unread 08-09-2013, 05:37 AM   #16
kloppk
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If you have high HC readings your EGR valve may not be working correctly.

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Unread 08-09-2013, 05:42 AM   #17
kloppk
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Check post #5 here http://www.jeepforum.com/forum/f12/w...jumper-754240/

The thread has info on where the high altitude jumper is and how to test to see if it's hooked up or not.
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Unread 08-11-2013, 12:25 AM   #18
Alphasolder
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The engine is all stock the mechanic gapped the plugs and did all the vacuum lines we are going to hook up the high altitude adjuster I will change my oil to the 20 w 50 I know the mechanic is setting everything to factory specs but I did buy 3:73 gears because people said that would help because the engine wouldn't work so hard at higher speeds then the 4:56 gears in there now the guy who sold me the gears said I should change my distributor to hei when we get the gears in we will retest this time were making sure o2 sensor is working high alitude adjuster is hooked up and heavier oil and I will check the air filter again but I just changed after cleaning the motor and I'm going to check the sensor in the air cleaner
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Unread 08-11-2013, 01:20 PM   #19
Old4X
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HEI will disable your computer and o2 sensor. Will not help you pass.
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Unread 08-11-2013, 10:19 PM   #20
Alphasolder
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I don't think any upgrades have been made to engine it's all stock all vacuum lines were done by mechanic I will try the heavier oil and I am having the high altitude adjuster hooked up the plugs were gapped at recommended specs by mechanic the mechanic said mixing the e85 with my gas would make it burn cleaner were going to put in the new gears 3:73 getting rid of 4:56 gears and lockers so I can drive in winter and get some highway gears so I'm not at such a high rpm going 75 but I still want to go off roading too I don't know I just want to plate it and drive it finally
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Unread 08-11-2013, 10:21 PM   #21
Alphasolder
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Thanks for telling me about the hei that was the next thing I was thinking about
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Unread 08-11-2013, 10:21 PM   #22
Alphasolder
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I can put a new carb on but I just bought this one
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Unread 08-12-2013, 06:02 AM   #23
jay-h
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Quote:
Originally Posted by Alphasolder View Post
You can't register as historic here for classic plates it has to be 1975 or older now. You don't think you could pass with a carb here in Colorado. I'm having the o2 sensor checked and the nutter bypass done. As of today I have also did new spark plugs and points plus put in Moab and we cleaned the motor again with 109 engine cleaner we have e85 in it and we're doing the high altitude adjuster and I removed the full time locker in the rear end. I'm really running out of ideas here what else can it be that causes a engine to run to rich or stopping the fuel from burning all the way????
Couple of things E85 will definitely NOT work (or are you thinking of the 5-10% alcohol/gas mix commonly sold at stations).

Tire size etc won't change test results unless they do it on a dyno.. is that what they are doing there?
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Unread 08-12-2013, 10:01 PM   #24
Alphasolder
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I know about the alcohol thing but they put in e85 and yes it has to go on a dyno
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Unread 08-13-2013, 07:56 AM   #25
jay-h
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E85 can damage systems that are not designed for it. It attacks seals, corrodes metal parts and can damage sensors.

NEVER use E85 in a non flex fuel engine.
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Unread 08-13-2013, 11:55 AM   #26
Old4X
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On your high altitude jumper, it is located in different places on different year models. Check the Jeep service manual for your year.

Also, there is a Factory Service bulletin that details the additional adjustments and settings that must be mad when using the high altitude jumper. Colorado Jeep dealers should all have it. It isn't as simple as hooking it up and all problems are gone.

The service manual also has pages devoted to properly adjusting the internals of your carburetor.
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Unread 08-14-2013, 07:57 PM   #27
Alphasolder
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What else do you have to do? I don't have a owners manual. I talked to a state emission guy today he said he never heard of it but did find it in the diagrams. He thinks its the o2 sensor or a problem with the carb.
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Unread 08-14-2013, 08:55 PM   #28
superj
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Search factory service manual and look for my screen name. I linked up the 87 FSM. It will have the info you need
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Unread 08-14-2013, 08:57 PM   #29
Old4X
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Factory service manuals are available in PDF fre on line. I have the 90 , qnd yours should be the same, but a quick search should find the 87 for you. The 90 is here:

https://docs.google.com/file/d/0B4Zq...hl=en_US&pli=1


If you have to do this every year or two, and can not do the work yourself, it is far cheaper to switch to an approved fuel injection system, or swap in a 4.0 engine.
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Unread 08-14-2013, 09:00 PM   #30
Old4X
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Quote:
Originally Posted by superj View Post
Search factory service manual and look for my screen name. I linked up the 87 FSM. It will have the info you need
You type quicker than me. I knew I had seen the 87 manual, glad to see you offer it again.

Do you have the FSB on jumper use and adjustments? It is mentioned on page 14-125 in my manual.
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