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2.6L frustrating misfire #1077245 03/18/15 03:30 PM
Joined: Apr 2006
Posts: 3,606
Mad_Scientist Offline OP
Roll Me Over
*****
Hi all,

Long time no post. I hope you are all well!

The Mikuni carb had been molested over the years and the second barrel actuator stopped working. So I fitted a weber 32/36 and the thing went like a rocket! However, while tuning it a misfire developed and I am struggling to fix it.

When the misfire started I went to check the plugs/wires and cylinder #2 wire feel apart (only a few months old). With the wire off the engine ran the same. I replaced the plugs, wires, cap, rotor with no difference. I then played with the timing and replaced the fuel filter...nope. I am getting spark to all cylinders, verified with my timing light. May be I need to check cylinder compression?

Stuff I am not sure about;

1. when I tired to set the idle mixture, turning the screw counterclockwise does result in an idle drop. Turning is fully clockwise does not. I think I had it running rich because when driving with the engine hot, fuel was igniting in the carb <img src="/forums/images/graemlins/scared.gif" alt="" /> Not sure what to do there. I have not fitted a fuel pressure regulator yet (no dieseling). I do have one. May be that will help?

2. The secondary coil resistance is 10.5 kohms. That seemed low compared to the FSM, which says 14.5-19.5. However, coils at auto parts stores say 8.9kohms. What coils do folk use?

3. to set the timing correctly I have to retard the dizzy fully. That can't be right? timing chain issue?

Thanks all <img src="/forums/images/graemlins/kewl.gif" alt="" />


'97 Montero 'LSR' - 4.6 gears & factory rear locker, 33" Procomp muds on 15x8 steelies, 50mm coil spacers, T-bar crank, Airlift, sans rear sway, 50mm rear frame & fuel tank lift, Aisins, ARB front bumper + 10k lb winch, 50mm DIY body lift, rock sliders, cut rear quarter panels...
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Re: 2.6L frustrating misfire [Re: Mad_Scientist] #1077246 03/19/15 03:38 PM
Joined: Feb 2010
Posts: 64
leadheavy52 Offline
Getting the Wheeling Fever
I had a similar issues with an the 2.6 in my '88. I tried everything. New plugs, wires, coil and timing. Adjusted the carb and it still misfired. What it turned out to be was a broken cam cap on the top of the head. It wasn't allowing the valves proper operation as it cammed over. Simple fix was to replace the cap. I lucked out that there was no real damage to the camshaft. Your problem may not be related, but it's worth a check.


1988 SWB Montero - 2.6L - 5-speed
Weber Carb
(Coming Soon) Rugged Ridge AVM Hubs
Re: 2.6L frustrating misfire [Re: leadheavy52] #1077247 03/20/15 05:38 PM
Joined: Apr 2006
Posts: 3,606
Mad_Scientist Offline OP
Roll Me Over
*****
Thanks! I will check that out <img src="/forums/images/graemlins/kewl.gif" alt="" />


'97 Montero 'LSR' - 4.6 gears & factory rear locker, 33" Procomp muds on 15x8 steelies, 50mm coil spacers, T-bar crank, Airlift, sans rear sway, 50mm rear frame & fuel tank lift, Aisins, ARB front bumper + 10k lb winch, 50mm DIY body lift, rock sliders, cut rear quarter panels...







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