Didnt someone else just have a problem like this???? Wasnt his fix in the dist cam lobe gap?
Its electrical in nature, stay with that. to isolate what it is change known good parts with your known fouling parts. ie sparkplug to another cylinder, one piece at a time. then the wire,......then a known cap......
Even a "brand new" NOS part has 20-30 years of shelf life on it before you put it in, remember that. Its been shipped, dropped, weathered, and UPS'ed around the world before you even got it.
If you have a slave truck nearby try that, EVEN with those fully charged new Batteries you may have in there. You will get more spark, hotter, faster winding with a slave.
And if that doesnt work doing all the before mentioned items, ........shoot it like a lame horse!
Just kidding, it has to be something electrical, your talking spark right? trace back from the plug. its usally not mechanical in nature for these trucks that goes wrong.........its electrical problems.
Cliff Smith SSgt USMC Iraq
From: "Mil-Veh Co." <milveh@sbcglobal.net> To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org> Subject: Re: [MV] Out of ideas... M151 still misses Date: Fri, 4 Feb 2005 22:19:35 -0800 (PST) First, thanks for the fouling info., Joe, Cliff and anyone else who may still provide info. OK, just one more question and this is giving me fits, I'm still having a problem with a dead miss. Here is what I've done to correct a "no fire" in number 2 cylinder on the M151: 1. R/R spark plug with new plug, could see decent spark, but still no combustion. Plug smelled of gas, but not wet with gas. (also checked plug wires for firing order, Firing Order: 1-3-4-2 ) 2. Did compression check, 105 lbs...passable, all about 105 lbs while cranking. (new is about 135 lbs.) 3. R/R plug wire with new wire. 4. R/R dist. cap with new
cap. 5. Replace entire Prestolite electronic distributer with new unit and replaced all wires with new...getting desperate!!! Still missing on #2!! 6. Replaced spark plug again, just to double check. 7. Removed valve cover, observed engine running, rocker arms moved up and down smoothly and checked for ..... a. Broken valve spring b. Loose or broken push rod c. Proper lift on valves looking possible cam lobe damage. (all fine) 8. Checked to see if cam had somehow skipped time, engine was TDC on #1 when at the timing mark on crank pully..can't be cam timing. 9. Made sure batteries were fully charged and proper ground. No problems, they're new and wiring new, all tight and no corrosion anywhere. Everything seems fine, just noticed that the compression was a little low, but within range for an older engine. 10. I can't think of anything reasonable that it could be...now thinking its
something unreasonable... Considered a foreign object (mouse, bird, rag, etc.,) may have somehow entered the intake manifold during the carb rebuild and is not allowing combustable air into number 2 hole..but then I did get good compression, so is that likely???? I'm running out of ideas, good ones, bad ones, I've been over this engine a dozen times and can't find a thing wrong. If I can't figure out anything else, then I will pull the intake manifold and look into the head for some sort of obstruction. I mean, what's left to check, right? Arrrrrgggggh! Summary... can't be fire, has good fire and good plugs. Can't be a valve, ok compression. Timing is on. Firing order is right. 3 cyls run great, so can't be carb. ===Mil-Veh is a member-supported mailing list=== To unsubscribe, send e-mail to: <mil-veh-off@mil-veh.org> To switch to the DIGEST mode, send e-mail to <mil-veh-digest@mil-veh.org> To reach a human, contact <ack@mil-veh.org>