1999 4.0 #2 misfire
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Three Wheeling
Joined: Dec 2012
Posts: 79
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1999 4.0 #2 misfire
Hi everyone. Just finished the rebuild on my Discovery 2 and I have a misfire on the number 2 cylinder. When I bought the truck, the other owner added liquid glass to try and seal the bad head gasket. It did not seal it and I bought the truck. With the engine disassembled, I noticed that the top of the piston was covered with the silica, as well as the tip of the fuel injector. After the assembly with new top hats and all other major components, there is a miss fire on #2.
I suspect that the injector is clogged beyond use. Things I checked.
Compression reading at 135 psi warm crank.
No coloring on plug tip at all.
Plug does not look wet.
Checked the injector plug to make sure its seated.
No fuel mist with a quick start/ plug out and grounded.
Not sure if the O2 sensors are bad from the prior owner running it with a blown HG on the same side. Any ideas on why number 2 won't fire.
MAK
I suspect that the injector is clogged beyond use. Things I checked.
Compression reading at 135 psi warm crank.
No coloring on plug tip at all.
Plug does not look wet.
Checked the injector plug to make sure its seated.
No fuel mist with a quick start/ plug out and grounded.
Not sure if the O2 sensors are bad from the prior owner running it with a blown HG on the same side. Any ideas on why number 2 won't fire.
MAK
Rock Crawling
Joined: Oct 2011
Posts: 480
Likes: 11
Recheck your spark plug wiring.
Make sure you did no roll the intake gasket at #2 cyl.
Check your reluctor ring and make sure you did not bend or break off
the tabs at/around the torque converter bolts.
Swap #2 injector with #4 and see if the misfire follows the injector.
Cheers
Make sure you did no roll the intake gasket at #2 cyl.
Check your reluctor ring and make sure you did not bend or break off
the tabs at/around the torque converter bolts.
Swap #2 injector with #4 and see if the misfire follows the injector.
Cheers
Last edited by threalassmikeg; Feb 20, 2013 at 07:10 PM.
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Three Wheeling
Joined: Dec 2012
Posts: 79
Likes: 0
Mike,
Not sure about the tabs on the torque converter. I have looked in the manual and am wondering what the tabs are for. The signal is generated from the CPS and the cut groove in the flywheel. Is there a signal generated from the tabs? From what I see, my flywheel groove is machined or cast with no tabs. Bosch system on it.
When I have time, I will check the coils and install a good serviced injector while the manifold is off.
MAK
Not sure about the tabs on the torque converter. I have looked in the manual and am wondering what the tabs are for. The signal is generated from the CPS and the cut groove in the flywheel. Is there a signal generated from the tabs? From what I see, my flywheel groove is machined or cast with no tabs. Bosch system on it.
When I have time, I will check the coils and install a good serviced injector while the manifold is off.
MAK
Last edited by racerxnet; Feb 20, 2013 at 09:41 PM.
Super Moderator
Joined: Jan 2011
Posts: 16,322
Likes: 88
From: Savannah Georgia
Got +12 volts at the injector plug on one side? Positive is common to all the injectors, and the Bosch ECU grounds them individually to operate. Wires do get damaged sometimes. It will be the orange and black wire that is on each injector, fed by fuse 1 (all injectors, so must be OK) under hood. I believe yellow with white is the ground side of number 2, which runs off to the ECU. Injector coil is 14.5 ohms, will vary a little with temp.
Last edited by Savannah Buzz; Feb 21, 2013 at 08:30 AM.
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