Question about 1990 Mercedes-Benz 190
Hard starting when engine cold. once it start it will keep running if you turn it off it will start right away
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Posted on Jan 02, 2017
SOURCE: hard start
have u done a fuel pump pressure leakdown test? if not do one, the fuel pressure must stay within 5 PSI of the pressure at engine shut down for 24 hours, if it leaks down u will get a hard start and long cranking times, I suspect this is the problem but do the test, u will need a fuel pressure test guage (avail from Kragen auto), the test port is on the tiop of th engine in the fuel supply rail to the fuel injectors, looks like a metal tire valve.
Posted on Jan 14, 2009
Check your fuel pump pressure. You can rent a fuel pressure gauge from autozone and check pressure coming from supply pump. I bet its weak. Hope this helps.
Posted on May 09, 2009
this problem is A/c system leaking.add enough freon R134A will solve the problem .but you must check where is leaking important.
Posted on Jul 15, 2009
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