- Location
- Hartsville, South Carolina
Just a thought but it might be blowing the spark out.... did you test the plugs or use a spark tester? Did you do a wet test?
Ghost said:Just a thought but it might be blowing the spark out.... did you test the plugs or use a spark tester? Did you do a wet test?
Krapola said:Plugs have been tested...All six spark when energized....Wet test? Not familiar with the term...Please explain....
Krapola said:It's got a damb Carb....Can't be that hard for at least a single pop in the chanmber...One weird thing though(maybe only weird to me), while cranking this engine, fuel blows out the top of the carb...WTF???
Well, whatever the problem is, I know it is going to be f-ing stupid...
Krapola said:PS: Grizzley, didn't mean to piss ya off....Im a bit frustrated answering the same quesitons over and over...
Grizzley said:OK, that's just wrong. The only reason I can think of that you have positive pressure in the manifold is the cam and crank aren't timed and intakes are open on compression stroke, maybe only the start of it, but enough to cause an updraft.
You didn't piss me off, just flash backs to my 84 and the hassle i had with that thing. Just a question that i don't think has been asked. I went through and reread from the beginning and I noticed that you said the timing is within 2*. Don't get upset, but how do you know?
Ghost said:Compresion wet test.... sorry should have been more specific. I know you pposted your compresion and it looked good but i had a 84 4 popper that would not run on the #1. Everything was fine like you say never could figure out what was wrong. Ended up dropping a 94 MPI 2.5 in its place and cannot keep the jeep together! The mighty 4 popper has a tendacy to break shiat when the skinny pedal is in play!
Krapola said:Yep, got yer point...Maybe I should toss the V6 2.8 for the 3.4 eh?
BigDadys94xj said:Another thought to throw in here. How can you check for proper timing when the engine isnt running? Yes you can find out if you have spark through the wires with a timing light and you will get some sort of timing reading while cranking the engine but you can not check for proper ignition timing just by cranking the engine over. if it is backfiriing through the carb when cranking you have a SERIOUS timing issue! If this is to complicated for your current mechanical skills then take it to a tech who knows what he/she is doing. I would also bet if you talked to a trained Jeep tech (or even a GM tech that has been around long enough to have worked on a few 2.8's) I am sure that they could point you in the right direction . Without a doubt in my mind it is a timing issue and nothing else! Either the distrubutor and wires are out of time or your cam is out of time. I have worked on a bunch of 2.8's and they have been known to strech the timing chain to the point where the cam may jump a tooth or 2 . Just enough to really screw things up. Another thing to try is to take everthing back apart that you installed and start over from the beginning and see if maybe you missed something (I know you think it cant be but it does happen). Good Luck!