![]() I think the problem is head flow vs cam and exhaust on the 2.6. I'll bet it works better that way than with a high flow and header. Funny but I've never run it with a stock exhaust. 1 tooth advanced and the header will glow in short order. I got mine running good with the Delta and high flow exhaust. My experience is they are hyper sensitive to timing. Too big a pipe on the 2.6 will cause lost torque down low and popping exhaust. When 1st started and driving down the hill using 2nd gear for braking Red Beans burbles and pops. Is this your setup? I thought you were now 100% stock?Ī cam and a big exhaust contribute to the popping. Possible answer #3: Could it be that this is the way it is with a Delta 260 Cam, header and bigger exhaust? Add to that the 1/2 tooth of valve timing and a little "burble & pop" becomes inevitable? ![]() I can relatively easily fix the half tooth issue, but can a half tooth cause this issue? If I pull a vacuum hose, I hear a change right away. Besides if I had vacuum leak, I'd expect other issues with getting the it to idle, etc., but it runs & idles fine at 12 BTDC with no fiddling. So, I'd be really shocked and annoyed if that was the source. I was pretty careful doing the intake manifold. FPR, Charcoal can, Brake booster.that's all I can think of off the top of my head. Also I really don't have that much vacuum stuff on the truck. However, the O2 is actually only looking at 2 cylinders. Possible answer #1: I have a vacuum leak somewhere, but the fact that the O2 looks good makes me wonder. I think this is OK, but the previous motor didn't do this after a throttle blip (I think). This is what I usually see when engine breaking. The one thing that is new: When the RPMs come back down after a throttle blip, the O2 reads - which means "off the charts" lean. Richens out a lot when I stomp the gas pedal. Leans out a little bit when the load gets really low. I don't remember which one.Īir fuel Mixture: Via the wideband O2 it appears to be where it should be during operation: Right around 14.7 when putting around under small load. Valve Timing: I have an AMC head so I am either a half tooth advanced or retarded. No air injection tubes and the bosses on the head welded AND capped with pipe plugs. ![]() Should have a really good seal on the head. This type of backfire is usually too much air in the exhaust from an exhaust leak, a misfunctioning emissions air injector, vacuum leak, or a generally too lean condition in the motor (I think).Įxhaust: Calmini header with the flange ground flat. ![]() The motor is also in general a little "burbly" when on and off the throttle at low speeds. The backfire happes when the RPMS drop suddenly or I am heavily engine braking. My rebuilt 2.6 is backfiring in the exhaust. ![]()
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