Garage Support: Ford Focus 1.4 Duratec 2002 - Backfire through inlet manifold

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Ford Focus 1.4 Duratec 2002 - Backfire through inlet manifold Archived Message
Posted by Joe McGeoghan on March 17, 2007, 1:22 pm
This car arrived as a non-start. Would crank then backfire extremely strongly - you'd think the intake manifold would be in pieces.

I renewed the crank position sensor as a matter of course - most likely culprit and a common, easy and inexpensive job. No better.

Misfire DTC stored.

Found spark plugs, leads and surrounding area absolutely red-rusty. Removed and renewed seized plugs, renewed leads and coil pack.

Engine now runs, idles briefly @ 3,000 RPM, then settles to a rough/surging idle, backfiring very loudly and regularly through inlet manifold.

Throttle pedal has no effect on engine speed.

I have checked cam timing carefully - correct.

I'm not too keen on scoping waveforms at the moment for fear of doing damage by running the engine for more than a few seconds.

Would the cam sensor cause such a problem (disconnecting makes no difference).

TIA.

Regards,

Joe

Message Thread:

Ford Focus 1.4 Duratec 2002 - Backfire through inlet manifold - Joe McGeoghan March 17, 2007, 1:22 pm
replies - peter Cooper March 17, 2007, 1:41 pm
replies - Paul Foster March 17, 2007, 4:29 pm
replies - Joe McGeoghan March 18, 2007, 7:49 am
replies - ray ferreday March 18, 2007, 8:34 am
replies - Joe McGeoghan March 19, 2007, 7:27 am
replies - Paul Foster March 19, 2007, 4:38 pm
replies - Joe McGeoghan March 22, 2007, 11:07 am
replies - john smithson March 22, 2007, 11:55 am
replies - Joe McGeoghan March 22, 2007, 12:00 pm
fixed - UKAT5290 March 22, 2007, 6:03 pm
replies - Paul Foster March 22, 2007, 7:00 pm
replies - Joe McGeoghan March 23, 2007, 7:55 am