Help advice needed

[phantom wedge]

Hi boys long time no hear, took wedge out today running perfect for about hour,then no reason it stopped popping and banging and trying to cut out/hunting and losing rev`s but pulling away no probs.sorry guys no popping/banging on overrun.nice to see you are still out there and hope to see you all at BBWF 2010, any HELP! Please Crawford.

[honestjohntoo]

phantom wedge said:

running perfect for about hour,then no reason it stopped popping and banging and trying to cut out/hunting and losing rev`s but pulling away no probs.

The pop'n'bang syndrome is usually caused by insufficient air getting into the plenum on overrun, so one assumes you have the overrun valve screwed right in to encourage that.

Now all of a sudden you have no pop'n'bang so one might guess that some rogue air has found a portal to gain entry. Maybe the overrun valve got jammed open - tee he, but unlikely - or another air leak occurred (in desperation to stop the damaging effect of detonations in the exhaust system ).

Lots of stuff about finding and eliminating air leaks here

On the other hand, the hunting syndrome has its basic cause rooted in an over-rich mixture, usually - but in your case I suspect it isn't truly hunting (as in surging with no driver pedal input), its just simply misbehaving, as would happen if you have a rogue air leak, so that is where to start looking.

[phantom wedge]

Thanks for info, the exhaust dose smell rich when i arrived home and parked inthe garage any help, could it AFM playing up its 2am afm/lucus power risitor.

[rev-erend]

I would start with a basic wire check - check the plug to the ECU and AFM are still attached OK. Ckeck for any chaffed and cracked wires. Also check the throttle pot wires. Easy checks to do .. no equipment necessary.

[phantom wedge]

ok i will check in the morning thanks rev.