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Unread 03-13-2007, 08:00 AM   #1
ElvisV04290
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1990 YJ Wrangler 
 
Join Date: Mar 2006
Location: Macomb, Illinois
Posts: 1,329
Is mt timing the problem?

OK, so I installed my Weber like many of you know a few weeks ago, and I have been having a small problem. I have some hesitation on moderate to hard acceleration, and I'm thinking its the timing. I have replaced ALL the vacuum lines and have made sure they are connected correctly. The entire ignition system is new and double checked for loose connections. Plugs are 4 months old and clean. fuel pressure is 3psi (what Weber says it should be) and the fuel lines are clear and unkinked. I have a new fuel filter. The accelerator pump is working fine. Sometimes the engine has no problem when I put my foot to the floor, and other times I get a pop and a long hesitation, then the motor picks up very fast. I was thinking this is because the computer is no longer hooked up to the electronic feedback from the Carter; And because of this the computer is changing the timing on me cause it doesn't know whats going on. I know a nutter bypass would fix the computer problem but I want to be sure it my timing causing the problem, regardless if the computer is changing it or not. thanks guys.

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1990 YJ, Colorado Red with 'Laredo' markings, 4.2L, TF999, NP231, Valvoline Syn fluids, Weber 32/36, Nutter Bypass, Dana 30/35, 16" Electric Fan, Optima Yellow Top, 140amp alt., K&N Air Filter, Cherry Bomb muffler, SRC Front Bumper, CH&F Shackles, KC 100w Daylighters, Homemade Lightbar, Rear Aux lights, Cobra CB/PA/WX, 102" Whip Ant., 400 watt power inverter, 2 fire extinguishers, Mobile Internet & WiFi equipped.
Daily Driver since April 23rd, 2003

Northern Illinois Extreme Jeep Club Member www.extremejeepclub.com
Weber 32/36 Install -> http://www.jeepforum.com/forum/f12/weber-32-36-install-write-up-382309/
Early YJ Club Member #37
For anyone with a 4.2L --> http://groups.jeepforum.com/258s_Unite
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Unread 03-13-2007, 08:04 AM   #2
lah2420
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1995 YJ Wrangler 
 
Join Date: Mar 2006
Location: , Arkansas
Posts: 853
I speak from experience------Do the bypass. The computer is screwing with your timing.
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Unread 03-13-2007, 08:12 AM   #3
ElvisV04290
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1990 YJ Wrangler 
 
Join Date: Mar 2006
Location: Macomb, Illinois
Posts: 1,329
That's what I was thinking, I was going to do it no matter what, I just need to get a timing light. It will hit 70 here in Chicago, maybe I'll get to it today.
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1990 YJ, Colorado Red with 'Laredo' markings, 4.2L, TF999, NP231, Valvoline Syn fluids, Weber 32/36, Nutter Bypass, Dana 30/35, 16" Electric Fan, Optima Yellow Top, 140amp alt., K&N Air Filter, Cherry Bomb muffler, SRC Front Bumper, CH&F Shackles, KC 100w Daylighters, Homemade Lightbar, Rear Aux lights, Cobra CB/PA/WX, 102" Whip Ant., 400 watt power inverter, 2 fire extinguishers, Mobile Internet & WiFi equipped.
Daily Driver since April 23rd, 2003

Northern Illinois Extreme Jeep Club Member www.extremejeepclub.com
Weber 32/36 Install -> http://www.jeepforum.com/forum/showthread.php?t=382309
Early YJ Club Member #37
For anyone with a 4.2L --> http://groups.jeepforum.com/258s_Unite
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Unread 03-13-2007, 11:53 AM   #4
lah2420
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1995 YJ Wrangler 
 
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Location: , Arkansas
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You're as warm there today as it is in the South where I am. Enjoy while you can.
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Unread 03-13-2007, 09:54 PM   #5
timatoe
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1990 YJ Wrangler 
 
Join Date: Aug 2006
Location: Grass Valley California
Posts: 13,693
Do the bypass and the just unplug the computer until you can get all the wires pulled. Get a timing light, I got one from Autozone for $39 it's a pretty good unit. I definately agree the ECU is screwing with you.
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