My 740 non turbo wagon kept stalling. My mechanic said he couldnt find a problem when hooked up to the machine. Said it might be bad gas. Fuel pressure was at 54 psi. After draining gas and puting in new gas. I still had the problem. I looked up codes found 223, Chiton's says its the signal to and from the idle valve,122 signal missing or faulty air temp sensor, which I take for the air mass sensor &132 low or high voltage. I drainied the battery abit bystarting it several times getting it home. Now should I clean these two or replace one at a time? HELP!

 

UPDATE! I replaced air temp. sensor. cleaned throttle body and idle valve with cleaner. new plug, air cleaner & fuel filter. A new crank sensor and dist. cap were replaced in May. I put in a fuel pressure regulator last summer. The car is still hard to start and most or the time when I open the throttle even a little bit, it dies. It does sometimes pop a little (slight backfire through intake not exhaust).
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My 740 turbo had hiccups too. Gremlins are hard to solve because they are never consistent. Try easiest solutions first. Put new air filter in. Next, try a new fuel injection relay (cheap at junkyards). Visit www.stepbystepvolvo.com for diagnosing no-starts and other hints.

 

New fault code. When I plugged the plug into number 6, got the code 144. No load signal from the fuel system. Is something unplugged or do I need a fuel control unit? Can someone help me out? I can't find anything unplugged or find fuel control unit.
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How old is the fuel pump relay?

 

Thanks tech. for the advise. The relay is original equipment 09-09-91. I resoldered the connections in the relay and that fault code is gone. However the 223 code for the idle valve is still there. Any other sugestions before I invest over $200 for the idle valve?
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