Standard FPR running rich on idle and cruise

[Weyro]

So ive went back to the standard FPR and my car is now idling at an afr of 11.4, its also at around 12-13 when crusing at 60mph.

Obviously this is way too rich, but the car is fine at WOT.

Ive checked everything i can think of, coolant sensor, map sensor, IAT sensor, TPS, O2 sensor.

I noticed that if i remove the VAC hose from the FPR it has no affect on the idle AFR, with my adjustable regulator, removing the vac pipe made it go rich.

Any ideas?

Cheers

Edited March 29, 2013 by Weyro

[morgey]

O2 sensor?

[Weyro]

yea tried it too, forgot to say

[rmsnoel]

Is your standard regulator stuck from sitting in your garage.maybe?

[Weyro]

It seems to raise fine which is weird, I'll try soaking it in wd40 for a while

[starletburkie]

Have U a updated fuel pump?

[5T4R7ET N/A]

That AFR you mentioned is for cold start up and driving so you could have a temperature sensor problem or sticking thermostat?

[Weyro]

yea i have a walbro

i replaced the temp sensor not long ago, how would i test for sticking thermostat?

cheers

[starletburkie]

what ecu have you? id to lean off my emu with a td fuel pump on idle was around 12.2 on idle

[Weyro]

just standard ecu

[5T4R7ET N/A]

yea i have a walbro

i replaced the temp sensor not long ago, how would i test for sticking thermostat?

cheers

just replace the thermostat, they are very cheap.