740GL Rough Idle Stalling

USARUSH · Post by **USARUSH** » 30 May 2012, 22:26

Hello And Good Day All,
I have a 1990 740gl with the regina system in it.. The Car starts, a little hard at times, and upon firing it idles really rough.. After warming up the idle wanders from about 500-1500 continuously.. It drives okay at speed, but often stalls at lights.. I get codes 321 221 121 from port 2 .....what should I do ???

Thanks in Advance for Your Consideration.
RUSH

USARUSH · Post by **USARUSH** » 31 May 2012, 19:11

Took it to a pal of mine who restores old Chevys.. He cleaned the MAP sensor and went over my hoses , some of which were disconnected... Like Magic she purred like a kitten... The only thing is the check engine light is still on.... I checked bank 2 and still got 321 and 221 .... It runs like a dream... Should I still change the radio suppression relay and O2 sensors??

Post by **billofdurham** » 01 Jun 2012, 12:42

Welcome to Matthew's Volvo Site.

Have you erased the codes since your friend worked on it?

3-2-1 is the cold start valve and 2-2-1 is Lambda operation, otherwise known as O2 sensor. This could have been thrown up by the MAP sensor or hoses off.

Bill.