1990 Wrangler 4.2L Timing Help - Page 2 - JeepForum.com
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post #16 of 42 Old 05-14-2010, 11:22 AM Thread Starter
hubb6666
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1990 YJ Wrangler 
 
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Does anyone have a pic of the throttle linkage? The one I have doesn't look correct.

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post #17 of 42 Old 05-14-2010, 01:53 PM
doherty80
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1990 Jeep Wrangler Laredo 4.2L L6 5spd Weber 32/36 3inbl, 32" MT, hella500 light bar selling cj yj plow pm for details
|_______
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post #18 of 42 Old 05-14-2010, 03:09 PM
squib518
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1998 TJ Wrangler 
 
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You may have to create your own linkage--I did. Also, I was having the exact same problem on my timing. I manually found TDC using the ol' screw driver in the spark plug hole. My timing mark wasn't even close. I then drew a new mark, and rechecked timing. Now neither mark was on the scale. Took it to the shop to get it checked out, and I sold it while it was sitting in the parking lot waiting to get pulled into a bay. In the end I have no advice, but I feel your pain.
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post #19 of 42 Old 05-14-2010, 03:23 PM
Fernando
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The Weber 34 will work with the proper jets! which you probably have already...


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I don't mind writing for Fernando because he reads, and re-reads EVERY WORD!... Good to write for someone that actually READS the answer, and takes time to UNDERSTAND what comes back for an answer!
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post #20 of 42 Old 05-14-2010, 03:30 PM Thread Starter
hubb6666
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Quote:
Originally Posted by squib518 View Post
You may have to create your own linkage--I did. Also, I was having the exact same problem on my timing. I manually found TDC using the ol' screw driver in the spark plug hole. My timing mark wasn't even close. I then drew a new mark, and rechecked timing. Now neither mark was on the scale. Took it to the shop to get it checked out, and I sold it while it was sitting in the parking lot waiting to get pulled into a bay. In the end I have no advice, but I feel your pain.
Okay that was embarrassing. I was wrapping things up for the day and I said to myself. Self why don't you at least put that pretty air cleaner on. I opened the filter package and there was the throttle bracket. Anyway going to Lowes and Advanced Auto to get a few more parts and I will try starting it tomorrow. If I still have a problem then I will be doing what Fernando suggested and check the timing chain. Thanks everyone for all your help.
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post #21 of 42 Old 05-14-2010, 03:31 PM
dtn8tr
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Here are some pics from my 38.





1997 TJ, 5" IRO front with 4.5" HD IRO WJ rear, 35x12.5x15 Mickey Thompson MTZ, JKS disconnects
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post #22 of 42 Old 05-14-2010, 05:33 PM
Fernando
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Good luck with it I will be checking the forums for your progress!!


Quote:
Originally Posted by JeepHammer
I don't mind writing for Fernando because he reads, and re-reads EVERY WORD!... Good to write for someone that actually READS the answer, and takes time to UNDERSTAND what comes back for an answer!
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post #23 of 42 Old 05-14-2010, 07:08 PM Thread Starter
hubb6666
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Quote:
Originally Posted by wanabejeeper View Post
Thats a nice rig if you can get it running right... Do the rush mod and see where that gets you.
I just looked at your build thread. You have your hands full. Looking really nice and can't wait to see the final results.
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post #24 of 42 Old 05-14-2010, 07:22 PM
Burnerman
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Quote:
Originally Posted by hubb6666 View Post
Another thing I noticed is my manifold vacuum is 10.
That's about 1/2 of what it should have at idle. My 4.2 would idle around 20-21" at idle with my "modded" Carter and the Howell TBI.

96 ZJ.
05' Grand Cherokee Limited, 2"OME lift
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post #25 of 42 Old 05-14-2010, 07:44 PM Thread Starter
hubb6666
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Quote:
Originally Posted by Burnerman View Post
That's about 1/2 of what it should have at idle. My 4.2 would idle around 20-21" at idle with my "modded" Carter and the Howell TBI.
I checked my compression and I'm getting anywhere between 158 to 162 on all cylinders. I have no clue why I only have 10" at idle.
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post #26 of 42 Old 05-14-2010, 07:49 PM
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Big vacuum leak or timing is way off. Which manifold are you using now? If you have the stock manifold check the manifold heater. There's a gasket and an o ring that seal it off. You'll have to pull the manifold to get to it. You are checking manifold vac below the carb or right on the manifold correct?

96 ZJ.
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post #27 of 42 Old 05-14-2010, 08:02 PM
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High manifold pressure at idle indicates very retarded ignition. You can try advancing the timing and backing off the carb idle screw till you hit 20 - 21 in on your vac gauge.

If you static timed it and still have this problem, pull the timing cover off and see what the deal is.Proper installation of the timing chain and gears isn't rocket science, but there are opportunities to get it wrong.

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #28 of 42 Old 05-14-2010, 08:09 PM Thread Starter
hubb6666
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I just put the stock manifold on today and plan on starting it tomorrow. I'm checking manifold vacuum not port. I will have to see what your talking about tomorrow on the manifold heater. When I had the Offenhauser intake on I sprayed carb cleaner all around the intake and never found any leaks. I swear it looks like everything is leaning towards the timing chain or cam. At idle (rough) the best I can get my timing light to read is 45 degrees and the spark plugs are very black.
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post #29 of 42 Old 05-14-2010, 08:10 PM
yellow2kgt
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On the timing issue.. If is the original balancer it could have slipped. It obviously sounds like you have other issues with low vacuum not running right. However, I had a problem with not being able to set the timing with a light. When I tried the mark was about 60 degrees off. I just set it by ear and it ran great. Come to find out the outside of the balancer had walked. A new balancer was installed and the timing marks are now where they should be.

1990 Jeep YJ 4.2
Howell EFI, BDS 3.5" lift, M.O.R.E 5/8" Boomerang shackles, 1" Daystar BL, 1" JKS MML, TFI, Crager soft 8s w 35" Dunlop Mud Rovers, Ford 8.8, 4.88s, Dana 30 E-Locker, Terra Flex SYE, Tom Woods CV shaft, Warn M8000.
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post #30 of 42 Old 05-14-2010, 08:22 PM Thread Starter
hubb6666
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Quote:
Originally Posted by Old4X View Post
High manifold pressure at idle indicates very retarded ignition. You can try advancing the timing and backing off the carb idle screw till you hit 20 - 21 in on your vac gauge.

If you static timed it and still have this problem, pull the timing cover off and see what the deal is.Proper installation of the timing chain and gears isn't rocket science, but there are opportunities to get it wrong.
I will try tomorrow with the stock intake and the Weber 34 and see what happens.
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