Hi everbody I have an 89 5.0 H.0 motor in a 76 bronco i was wondering about what the timing should advance to when the engine is reved up also have a problem with it back firing in the intake and wondering if I should use 12 or 14 deg instead of 10? would this cure my backfire
Well your air to fuel is off but from what is the question. Need to know everything about your motor. Are you running mass air is the conversion right, what maf if so and do the injectors match. Are you setting the timing correctly by pulling the spout conn. Is your fuel pressure at 38# at idle with vacuum line off. ETC. What mods if any...
most likely it is vacuum leak, but having timing set to low can also cause is. if it is back firing when idling its a vacuum leak but if it is back firing when on the throttle like cruising at a steady pace then it is timing.
The motor does not backfire at an idle it only does it when pressing on the throttle under load. Not sure how many pounds are flowing through the injectors at an idle will find out what it is and also what maf I have. It came out of a 88 lincoln car so i think it was a speed density motor to start with but i sent my comp off to be checked out with the new wiring harnes that i had to buy
I checked for a vaccum leak and I dont have one i did advance the timing to 12 and it backfires less than it did before so i tink im going to try 14 deg now and see what that does. Also how do you measure your maf? is it the inside diameter where the sensor is plugged in?
you might have a weak ignition or a bad valve seat, or something, but try replacing the spark plugs or checking them, the wires, and make sure everything is all connected right and in the correct order.
shoot, could simply be bad gas! Check all the plugs for temperature after its been running a few minutes (if one's colder than the others its not firing). Then pull the plugs n look em over if you've verified it's not just crappy gas.
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i pulled the plugs and all of them are white except #1 and #3 which have the new injectors the two plugs are black on the ceramic and white on the electrode so i swapped 1 and 5 injector to see if it follows or if it is in the wiring