I got a MH Barina 91 mdl, just been reconditioned, runs but intermittantly backfiring through the inlet manifold, i have triple checked the valve timing but it seems ok. what would be the cause of this?
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backfiring is flame coming out the inlet manifold ,
timing , valve s are this problem area
check for correct firing order , loose ground wires , problem ignition control module , faulty coil/s could even be weak valve springs
big headed valves go in the inlet holes ( ones to the inlet manifold and little headed valves go in the exhaust ports
Measure the spring heights but they should be the same so they can go where ever
If you have large dia springs and small dia springs the little ones fit inside the larger ones to stop spring bounce at high rpms.
backfiring is ignition of the fuel mixture while an inlet valve is still open. Check firing order as there may be a HT lead crossed . If it backfires then the mixture is burnt in the inlet manifold so there is nothing left for the cylinders so it will stall. If you are running holley carby then check the power valve for a hole in the diaphram Check for vacuum leaks. check ignition timing is correct and not too far advanced. if the HT leads are touching each other this will induce a spark in the wrong cylinder --use lead spacers from an auto spares shop
the alternator runs on bushes pushed by springs a new regulator that has new bushes and springs should fix it as long as the armature isn't damaged i would ask the auto elec how much for a reconditioned alternator or if you don't trust auto elec try another auto elec, if they doth say same thing, they are right, your loyalty to your mechanic has cost you a small fortune already .auto electricians have more advanced tools for testing , hope this helps
No i think the box needs taking out and stripping and reconditioning ,these older vehicles are not computer controled but mechanical controlled ,so check the vacumn pipe from gearbox to the inlet manifold for deteroration