EP3 power loss

[aaaaron98]

After Driving my EP3 in the snow (not sure if this has any relevance) around a week ago, the EML came on after around 30 mins of driving. I experienced a slight misfire and loss of power.

I got home, unplugged battery etc. did the idle relearn and the car ran fine with no EML. I drove around 60 miles the next day faultlessly, but at the end of my journey the car was bogging down/hesitating and wanting to cutout under anything more than light throttle.

Problem has persisted for a week, and the car is barely driveable, as the bogging down and hesistating is so bad. It also idles badly.

Anyone experienced or know what the possible cause could be?

So far checked valve clearances, replaced O2 sensor, cleaned ICV and throttle, and the fuel filter/pump is no more than a year old.

[chrismc1977]

Dodgy spark plug?

Can you not read fault codes on an EP3?

[Vtec_Luke]

Tbh I’d say you need to get it on a code reader first otherwise your going to end up going round in circles and spending money on bits you don’t need to! On a side note I know the k20 loves a good clean spark plug due to the nature of the highly tuned engine. I recently done a track day and killed a plug on my friends ep3 but tbh the plug didn’t even look that bad but a new set of plugs and it was fine.
Good luck

[Sillyhatday]

I just changed plugs in mine. It certainly has more torque just at normal driving rpm. They were in ok condition, nothing horrendous. Be a good place to cover with this sort of issue.

[aaaaron98]

No fault codes were displayed. Issue turned out to be the fuel pump not delivering fuel consistently. The wiring was a bit of a hack job by the previous owner to install a different fuel pump, this was causing a hell of a alot of heat to build up in the wires, creating resistance etc.

New fuel pump assembly and relay to be safe solved the issue.

[Sillyhatday]

Nice one Great to hear what the problem was