exhaust poping noise

[pro gsr]

i keep getting a poping cross back fire out the back exhaust, just when i back off and slowing down. Idles & revs without the poping, back fire noise.

what could be causing this?

i bought a new coil MSD BLASTER 2, put it in the car connected all the wires right. & put a 10.0mm ignition lead on the distributor to the coil.

i also had changed the o2 oxegen sensor from a vr4 got a base plate made up.

could this be a timing problem?

any help would be appreciated. cheers fellaz

[Junkers]

Detonation in the exhuast manifold from running rich would cause the popping noise.

[Cookiemonster]

Generally caused by fuel overrun.

[Junkers]

Could a msd blaster 2 coil create a reasonably bigger spark than a standard starion coil? i.e. making the spark to ignite whatever is in the exhuast port

[honest_jim]

mine started popping back like you discribed after i got a S/S exhaust put on. I think the cars running abit rich, it smells it sometimes. Trouble is it just sounds so good!

[merlin]

exhaust popping on throttle overun is usually caused by air/fuel mixtures going to lean, typically leaner than 17.5:1 accompanied with to much ignition timing eg more than 30 degrees BTDC.

If you are running an aftermarket ecu this is easily rectified, if standard is likely to be a bit more tricky, but may be related to what manifold port the vac line to the distributor is being used.

[Junkers]

Considering the injectors would only be flowing at an idle rate when you use your engine to slow down, it would be fair to expect a lean mixture, not sure how the timing would go so far out though?

[ProZac]

Buggered vacum advance unit?

Every starion i've had has popped and boomed away while engine braking, i considered it part of their charm.

[SIR GSR]

Personally I like it too...

Adds to the tough sound of the tough car....

Gotta love it....Good for scaring innocent pedestrians at crossings LOL

[merlin]

blue tailpipe flame has an immediate affect on the cars behind you in the harbour tunnel rofl