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The intermittent cold start problem with my 1995 850 turbo progressed over a period of about a year. Started with an occassional initial stumble and rough running when started and then moved very recently to hitting on two or three cylinders and then dying. In the latest stages it would run for 1-2 seconds and then die.
Symptoms: Had to be left cold over night for the problem to occur. Would not run and die on repeated attempts unless the key was switched all the way off and then on. If left in position II and then turned over: nothing, no fire in the hole. It would eventually start, after 3, 5, 8, 20 attempts and then run fine. And restart fine and endlessly when warm.
My guess: a fuel pressure problem, felt like a loss of “prime” in the fuel injection system. Did not feel electrical. I was wrong apparently.
Actions: Cleaned all the grounds, replaced the ECT sensor ($50) [thought the ECU didn’t know it was “cold”], checked every connection I could find, took the fuel pressure relay out and cleaned it. Gave up and took it to the dealer at my wifes’ insistence (no sense of adventure). Dealer had it for two weeks, every time they fiddled with something it would start and then the same problem would occur the next morning. YOU HAD to let it sit overnight. They replaced a fuel sensor (not the relay), resoldered the fuel relay, replaced the fuel pump and FINALLY replaced the fuel pressure relay with a new one. PROBLEM SOLVED, so far... I was getting pretty pissed because I could have played replace-the-part with every thing in the fuel delivery system. Very tricky to diagnose, mechanic said he rarely saw a bad relay in an 850, although now that they are getting older its more common. Thanks to Erwin and russb for their help. Hope this helps someone else. Replace the relay, it’s going to die anyway.
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