What causes a ERST running EFi to pop and sometimes even back fire when pulling away from a standstill ?

it seems to only do it when warmed up, or sitting a traffic lights etc... not when cold...

as i lift the clutch and go to pull away normally, it hesitates and judders, and you can hear the exhaust pop occasionally or if really bad it backfires ?

is this due to leads arc-ing with each other, or a worn rotor arm and dizzy cap ?

its fu*king annoying, everytime i am in town, it kangaroos from a standstill

 

What EFI are you running? Most modern systems will no longer have a rotor arm or dizzy.

The reason is most likely to be a too rich mixtue - the causes of this could be almost anything, from a warn cam lobe, to dodgy injector, wrong plug gap,bad set up...it could even be a sticking or leaking valve. Best to get it checked over by a pro - with the EFI there's not much you can do at home.

 

efi from a FRST

its a 2.1 zvh.... running L8 cosworth management...

someone said the TPS, could that be it ?

 

Right so it's the EFI injection manifold, but running Cosworth management? Who mapped it? What injectors? I don't think anyone here will be able to provide you with an answer - best go back to the tuner that installed the system and get them to take a look. Any sensor which is either no longer working or not properly calibrated or compatible with the system could cause such problems. It could even be a fault in the ECU itself.

 

yes cosworth management L8 from 4x4 sapphire...

green injectors (803 ?)...

ony had the car 1 month, didnt seem to do it when first got it...

any ideas on the TPS, just put brand new plugs in it (PP8s) and genuine leads

 

Wrong plug gap? You could swap the TPS easily enough so it's worth a try.

 

yeah someone just said the exact same thing, it could be wrong plug gap

something as simple as that

the plugs are ment for a big turbo escort cosworth, so i bet the gap is incorrect for an RS turbo ZVH, so i need to re-gap them

 

where can i find out how to correctly gap my motorcraft AGPR12 PP8 spark plugs ?

thanks

 

would a phase sensor covered in oil cause this problem ?

took the dizzy apart, and saw the phase sensor switch/plug was saturated in oil...

rotor arm and cap were fine.... just wet through phase sensor etc....