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Hi there. I bought a 91' Volvo 740 NA with 146k on it about a month ago for $700. The kid who owned it had no idea what he had on his hands; it was MINT and he was selling it so low because the wipers didn't work and it had a stumble/miss that he was telling the prospective buyers was a TRANS MOUNT.... Well, I fixed the seized up wiper motor/trans and found that the miss/lope (trans mount...) was a leaking intake manifold gasket. Now, other than some piddly things that any normal 20+ year old car would need (basic maintenance) like the flame trap and fluids, I'm still getting an SES light at start-up for about 2 minutes. My codes are a 132 (batt voltage), a 221 (O2/Lambda), and a 233 (Idle valve). I've cleared the codes several times, but they keep coming back on immediately. When I entered KOEO self-test with my dia port all of the sensors/switches/valves click or open/close, my IAC is opening and closing AND my idle speed is very stable (600-700 rpm) through all ranges cold and hot and at start-up I get a slightly higher idle that comes down quickly but gradually. However, I am getting a little fuel in my oil. I checked for blow-by with the cap off and I have a slight vacuum with the cap off, which signals to me no internal problems. My FPR isn't leaking and I can pull a consistent vacuum on it and it holds very well. The line going to the FPR is good and if I pull it and put my finger over the hole I get decent vacuum as well off of the intake; I haven't gauged the vacuum yet, but I'm sure it's acceptable.
SO, where do I go from here? With the OBD system being so primitive I can usually get things right by using old-school mechanical intuition, BUT being that there is an OBD system, albeit a primitive and finicky European one, and not being able to communicate with it except for with blips on an LED I'm kind of stumped.
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