Looking for some advice on troubleshooting an odd and troubling problem.. Getting ready for a Turbo Buick meet a few hours from home this weekend, and now thinking of leaving her home if this can't be diagnosed and fixed quickly.
She just flat quit on me twice while driving around town yesterday, Both times just cruising at about 40mph. Without warning of any kind, engine just stops. Happened to be looking at the Scanmaster at that moment and it appeared to lose all power. Display was all dashes. Check engine light comes on, I bump into neutral and coast to the side of the road. No malfuntion codes appearing on the Scanmaster and all other readings appear normal...maybe a little hot at 172 degrees?
Nothing obvious under the hood, battery connections are tight, etc..so I start her back up and drive a few more miles without any problem. A couple hours later, time to come home, same thing happens again. Stop, wait, start, go. This time as I'm pulling into the garage, I look down and see malfunction code 45 - running rich. I have a brand new O2 sensor replaced weeks ago, and fuel pressure at idle is 35 psi (where it has been for forever) Don't know if this is normal but I did notice that psi climbs to 40 as soon as the engine is turned off, then back down to 35 when you start up again. I can't see fuel pressure going down the road.
Does this sound familiar? Any ideas, suggestions? Only other thing I can think of is that I occasionally hear some light rattling noise just as I'm accelerating, then goes away. I've heard of folks having trouble with cracked manifolds, but I can't see any cracks. Would this cause a false rich mixture reading? Last thing, I swear I could smell a little something I haven't smelled before when getting out of the car...hard to describe...not pleasant, like something burning? No smoke or anyhting like that and it went away quickly, doesn't linger.
Thanks for any guidance - I have 48 hours!
She just flat quit on me twice while driving around town yesterday, Both times just cruising at about 40mph. Without warning of any kind, engine just stops. Happened to be looking at the Scanmaster at that moment and it appeared to lose all power. Display was all dashes. Check engine light comes on, I bump into neutral and coast to the side of the road. No malfuntion codes appearing on the Scanmaster and all other readings appear normal...maybe a little hot at 172 degrees?
Nothing obvious under the hood, battery connections are tight, etc..so I start her back up and drive a few more miles without any problem. A couple hours later, time to come home, same thing happens again. Stop, wait, start, go. This time as I'm pulling into the garage, I look down and see malfunction code 45 - running rich. I have a brand new O2 sensor replaced weeks ago, and fuel pressure at idle is 35 psi (where it has been for forever) Don't know if this is normal but I did notice that psi climbs to 40 as soon as the engine is turned off, then back down to 35 when you start up again. I can't see fuel pressure going down the road.
Does this sound familiar? Any ideas, suggestions? Only other thing I can think of is that I occasionally hear some light rattling noise just as I'm accelerating, then goes away. I've heard of folks having trouble with cracked manifolds, but I can't see any cracks. Would this cause a false rich mixture reading? Last thing, I swear I could smell a little something I haven't smelled before when getting out of the car...hard to describe...not pleasant, like something burning? No smoke or anyhting like that and it went away quickly, doesn't linger.
Thanks for any guidance - I have 48 hours!
