Need some help on timing - JeepForum.com
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post #1 of 7 Old 06-02-2019, 03:06 PM Thread Starter
Robbiescd
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Need some help on timing

Finally got my engine installed and all buttoned up. Time for a crank.

At first, no crank. Second, no crank. Third cranked but began to run at full throttle! Cut key off.

Did it again and again, began revving up like I had accelerator pressed all the way down.

Do have top dead center backwards or is something else going on.

Appreciate any responses. Baffled and would love to hear it running.

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post #2 of 7 Old 06-02-2019, 03:43 PM Thread Starter
Robbiescd
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Sorry.....thought I was in YJ and just saw TJ.....I’ll move
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post #3 of 7 Old 06-02-2019, 04:03 PM
mukluk
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Even though you're in a YJ, we'll still answer. Having an EFI kit installed on your YJ, uncommanded high revs immediately upon cranking up sounds like a vacuum leak. Make sure the intake manifold is fully seated on the head and that you didn't leave any loose bolts for the intake or throttle body.

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post #4 of 7 Old 06-02-2019, 05:37 PM
Jerry Bransford
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Quote:
Originally Posted by mukluk View Post
uncommanded high revs immediately upon cranking up sounds like a vacuum leak. Make sure the intake manifold is fully seated on the head and that you didn't leave any loose bolts for the intake or throttle body.
X2, high revs like that are typically caused by the intake manifold not being fully/properly seated.

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post #5 of 7 Old 06-02-2019, 07:26 PM
JEK3
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Don't forget vacuum lines. Make sure you don't have a wide-open fitting on your manifold.
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post #6 of 7 Old 06-03-2019, 07:01 PM
mukluk
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For anybody searching in the future, the cause was a vacuum leak from the intake manifold not seated correctly on the head: https://www.jeepforum.com/forum/f12/...l#post40637331
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post #7 of 7 Old 06-11-2019, 06:25 PM Thread Starter
Robbiescd
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You guys were dead on. I unplugged the brake booster line from the manifold and just stuck an old fuel line I had laying around on the nipple. Bought a CHEAP cigar, blew about three puffs in the intake and started looking. Got under the Jeep and saw smoke coming from where the intake mounts to the block. Looked closer and I could see I that I had grabbed only half of the alignment tabs. Took it off, insured it was in the alignment pins and bolted her up. Turned key over and she was began purring like a kitten! Won’t ever forget this!!!!
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