Backfiring - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

Homer? · 05-09-2002, 17:33

My old mans V8 EF is missing and backfiring when it's cold. The only way to stop it is to give it a boot full. I suspect it's the TPS as it has a delay when you accelerate even when it's warmed up ie put your foot half way down, doesn't do any thing for a second or two and then the power kicks in. It seems like fuel is arriving a bit late.

Anyone had a similar problem or know what could be causing it?

Thanks

ebxr8240 · 05-09-2002, 17:49

Check temp senser,egr is working properly.Is it starting like it is NOT going to cold start,idle slow.Back fires through inlet as you start to take off part throttle,then clears when 3/4 throttle? I guess the engine temp senser.
Could be tps? Use a voltmeter[D.C/ V] to check that volage slowly rises eveny to 5v at full throttle.koeo ..
Make sure the plugs and leads/cap are in good nick if not complete combustion, the o2 sensers pick this as rich and it will make it run lean..

Another check the connections on harness behind inlet,take out check for corrosion? put back should be enough.hth..

Homer? · 05-09-2002, 18:25

It does idle low when it's cold but doesn't backfire at idle. It backfires when taking off unless you give it a bit of stick.

Could be the engine temp sensor I guess. This would cause it to be to lean and backfire through the inlet manifold.

Will check the other things later today.

Thanks

ebxr8240 · 05-09-2002, 18:48

Yep I guess it's like a carb motor with a stuffed accelerator pump.When you open the throttle it leans out real bad..