740 TURBO WGN choking out

mfarrell2222 · Post by **mfarrell2222** » 13 Feb 2012, 16:47

My 740 turbo wagon started choking out today while I was driving in to work. I thought maybe my gas was frozen because my tank was low and it has been freezing at night. I nursed it to a filling station and filled it up. No change nursing it back home. It sat all day and no better at 4pm. In fact, it was worse. It is acting as thought the choke is stuck. Don't even know if that's possible. It would idle, but choke out when throttle was applied. I haven't run the on-board diagnostic yet. Anyone have a suggestion?

mfarrell2222 · Post by **mfarrell2222** » 13 Feb 2012, 22:34

Also, now that I think about it, the heat stopped working two days ago. Related?

mfarrell2222 · Post by **mfarrell2222** » 20 Feb 2012, 21:18

Took the fuel filter out and blew it out with compressed air. Took it for a drive and everything seems to be fine. Must've sucked up some junk when the fuel tank was low. Changed my thermostat, but still no heat. If it was my heater core I would expect the typical coolant dump, but none so far. All fuses are good. No idea.

mfarrell2222 · Post by **mfarrell2222** » 28 Feb 2012, 23:04

Not running fine anymore. I was suspecting the Catalytic converter, but I assume that a bad cat doesn't work ok part of the time. Now I'm starting to wonder if the front fuel pump isn't going out. Also, took out the heater gizmo on the fire wall and bypassed it. Still no heat. WAA?

Post by **billofdurham** » 29 Feb 2012, 11:43

Run the on-board diagnostic. It is the first place to start with diagnosis.

I would suspect the in-tank pump before the main as it is a priming pump for the main which can function, albeit poorly, on its own with a low fuel level. This would give you a reasonable idle but poor performance.

Also, took out the heater gizmo on the fire wall and bypassed it

Does this mean you are feeding hot water directly into the heater? If so this would indicate a blocked heater core.

Bill.