2.5L starting problems. - JeepForum.com
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post #1 of 4 Old 03-25-2009, 07:36 PM Thread Starter
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1995 YJ Wrangler 
Join Date: Dec 2006
Location: Mars
Posts: 506
2.5L starting problems.

Still havin problems with my 95 four banger. Just replaced the motor with a new one. Had to replace the distributor so thats new. Capacitors were replaced and worked fine before the swap. New crankshaft and camshaft position sensors. No check engine lights. I am gettin the cel before start up so i know that the computer is working ok. I was having problems like this before the swap and it seems to be temperature related. If i leave it sit overnight it wont start unless i put something in the engine bay to keep it warm. However, once it starts in the morning it will be fine for the rest of the day. The best i can get out of it is a couple pops but then it wont try to start at all. It also cranks over just fine. I'm completely out of ideas.

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post #2 of 4 Old 03-27-2009, 07:05 PM
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1946 CJ2A 
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Location: Chilliwack BC
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Sounds scary

I'm in the same process, replacing the engine in my 92 with a 98 TJ engine and sure hope all will go well as i have to reuse all the old parts since it's a long block only.
Your problem seems to be fuel related as you could be loosing pressure overnight in the fuel rail. You should have a look at the underside for a small leak, could be very small since you can still drive all day.
You can always try the old way when it does not start by pouring a small cap of fuel in the trottle to see if it sputter a bit more.
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post #3 of 4 Old 03-27-2009, 09:20 PM Thread Starter
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I definitely have fuel pressure. If you hit the relief valve on the fuel rail you can see lots of pressure. If i try to prime it through the tb it still just cranks. I just replaced the intake air charge temp sensor and it seems to be working but its been pretty warm here in PA as of late. Its supposed to be a little chilly tomorrow so i'll try to let you know how it works out.
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post #4 of 4 Old 04-09-2009, 07:59 PM Thread Starter
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Location: Mars
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Just to follow up my post, my problem was the intake air charge temp sensor.
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