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Unread 05-12-2014, 06:50 AM   #1
mzootie
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1991 YJ Wrangler 
 
Join Date: Nov 2013
Location: wilmington, de
Posts: 3
Fresh tune still hard starting

Ok I replaced plugs, wires, cap and rotor. Fuel pressure held pressure for 30 min at rail so no fuel problem. Jeep runs ok after starting. Hard starting occurs no matter hot/cold or when. It does eventually start every time. Thinking coil, CPS or ECU. Could run a little smoother but most folks would think it runs fine. What is the most probable thing to check next. Also jeep is 91 and only has 50K and did a lot of sitting along the way.

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Unread 05-12-2014, 07:51 AM   #2
Delawdude
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1993 YJ Wrangler 
 
Join Date: Mar 2014
Location: , Delaware
Posts: 375
How long has it been sitting--- could be bad gas if it's been sitting a long time. Drain (syphon) and add new.

May also want to check your timing--read this thread
http://www.jeepforum.com/forum/f12/timing-4-0l-508405/
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Unread 05-12-2014, 08:39 AM   #3
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,947
Always start with codes. Check your fault codes and post what you get:
http://www.jeepforum.com/forum/f12/h...codes-1257145/

Last tune up?

Dont guess, troubleshoot. Fuel or spark. Its holding pressure but it is possible that its still a fuel issue. Try some starting fluid and see if it cranks. Check your spark and see if it is blue.
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Unread 05-12-2014, 11:17 AM   #4
Old4X
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1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 4,932
Quote:
Originally Posted by Que89YJ View Post
Always start with codes. Check your fault codes and post what you get:
http://www.jeepforum.com/forum/f12/h...codes-1257145/

Last tune up?

Dont guess, troubleshoot. Fuel or spark. Its holding pressure but it is possible that its still a fuel issue. Try some starting fluid and see if it cranks. Check your spark and see if it is blue.
You really need a proper spark tester with today's ignitions. Only about 6 bucks at the auto parts store and is calibrated to quickly ID a weak spark vs a strong spark.

Also a proper fuel pressure gauge. It may hold pressure, but how much pressure?
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