Just bought an STi RA, when she's warm she drives superbly but i went to use it tonight and it took ages to get start. When i eventually got it running it miss fired, popped and back fired until it was warm, then it ran without fault..........any ideas?
Dave.

 

Coolant temp sensor might be faulty. Use the procedure in the manual to test it.
Spark plugs could also be fouled causing same problem.

 

Could also be a 'lazy' lambda

 

what year is ur car??

i had the same problem with my 1993 wrx with the phase 1 engine (the one with the individual coil packs) and it was just a dodgy coil pack

 

As did I on my 1995 import.

However the difference being, his problem goes away when the engine is warm. Mine didn't. The coil pack was knackered, so it ran like that constantly. Not just when it was cold.

 

Coolant Temp Sensor would be my choice. It's also the cheapest thing to try.

Phil

 

Thanks guys, all thoughts much appreciated!! I left the car overnight then started it this afternoon, instantly started albeit a little on the lumpy side. The weather was pretty mild today so i'll get the coolant sensor changed and hope for the best
Dave.
ps....she's a '95 version 2 STi RA.

 

Check the fault codes before doing anything!

 

Yup, check the fault codes.

But if you need to get a coolant temp sensor the part number is 22630AA041.

 

Good point, i'll check the codes first, many thanks for the part number