My son's 89 740 with the B234F starts hard when cold. It'll crank for 3-5 seconds, start, idle roughly for 3-5 seconds, then smooth out and run fine. Once warm all is good when restarting, but if she cools down, the same rough stuff happens again. Where and what should I be looking at?
Thanks and happy New Year to all.
Dave

Last Fall, my '91 Regina wouldn't start well when the temp was below freezing and not at all when it was really cold (like zero and below). I can't explain the mechanism, but when I replaced my fuel pressure regulator, the cold start problem disappeared. I replaced my FPR because there was gas in the vacuum line coming off the front of it. I hadn't expected to get my cold start fixed in the bargain.

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Andy in St. Paul, '91 745 Regina 198K mi, '89 244 142K, '87 245 RIP

Stuck Fuel Pump Regulator resulted in no start at 0 F even after repeated tries to start days later at 50 F. Removed FPR, confirmed gas flow, tapped a few times on wood and replaced w/ easy start & smooth idle. Obviously ordered a new one. I believe this same valve left us stranded in VT at -10 F in earlier years for a tow & tune-up for $800.

Bob
1988,740 GLE, 245K

And where is the Fuel Pump Regulator located?
Thanks for the tip. I never would have thought of this item!
Dave

It's right up front on top connected to fuel injector rail (metallic cylindrical w/three connections - vacuum, injector rail & fuel return). Two bolts to remove - twist & pull to dislodge fuel rail o'ring. Mine provided too much pressure (too rich) for start-up at 0 F twice in its 245K life. They apparently become stuck at low temperature. First occassion was at ~ 100K & second at 245K. I knew it was too rich when engine started upon removal!