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Unread 04-16-2012, 06:43 AM   #1
DrG123
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1981 CJ7 
 
Join Date: Apr 2012
Posts: 9
Need advise on knocking and stuttering!

OK, so I'm driving in this morning after letting the old girl warm up. She is an 81 cj7 with a 4 banger.
After about 15 minutes at 55 mph, she starts loudly knocking and stuttering like she's not getting enough gas. I pull over, and it all goes away. The rest of the drive in she's perfectly happy.
I turn her off, and after 15 minutes she won't start. Starter is engaging, just won't turn over (as in no fuel)?
Oil pressure is good, temp is good. Oil level is fine. Put in new fuel filter 2 months ago.
What ya think? Water in the tank? Has new plugs as well.
Any help will be greatly appreciated!
Also has new thermostat.

Michael

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Unread 04-16-2012, 09:58 AM   #2
DrG123
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1981 CJ7 
 
Join Date: Apr 2012
Posts: 9
Update, pulled the fuel filter, soaked with gas, changed it. Added sea foam.
Still won't start!
Interestingly, there is motor oil in the air cleaner assembly, probably from the breather which goes from the manifold cover to the air intake.
Hoping for some help here!
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Unread 04-16-2012, 03:12 PM   #3
pman
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1988 YJ Wrangler 
 
Join Date: Aug 2005
Location: Charleston, SC
Posts: 1,267
Have you confirmed that you have fuel and spark? Not intimately familiar with the 4 but checking for fuel to the carb and fire to the coil and plugs will get you going in the right direction.
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Unread 04-16-2012, 08:08 PM   #4
DrG123
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1981 CJ7 
 
Join Date: Apr 2012
Posts: 9
Thanx. Plugs are getting juice, but no vacuum through the carb!
No milk in the oil or radiator, no white smoke out the back.
I'm thinking timing chain!
The horror. The horror! LOL
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Unread 04-16-2012, 09:21 PM   #5
CoAce
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1977 CJ7 
 
Join Date: Aug 2011
Location: Canon City, Colorado
Posts: 325
Easy to find out....IF you know what timing was at.

Turn engine to TDC compression 0+old timing.
With that set pop the dizzy cap and see where the rotor sits.
Lined up with #1 plug wire?

You could even use 0 just to see if it's close.
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