Northstar Engines and System Technical Discussion Discussion, 97eldo Need Help in Cadillac Engine Discussion; HAVE 97 ELDO WITH 47,000 MILES ON IT. ENGINE GOT SLOWER AND SLOWER TO START WITH FIRST BACKFIRE, THEN RAN ...
HAVE 97 ELDO WITH 47,000 MILES ON IT. ENGINE GOT SLOWER AND SLOWER TO START WITH FIRST BACKFIRE, THEN RAN BEAUTIFUL. HAD BIG BACKFIRE AND NOW ENGINE WILL NOT START BUT BACKFIRES. COULD THIS BE A BAD CRANKSHAFT POSITION SENSOR. APPRECIATE ANY HELP ON THIS PROBLEM.
Check the fuel pressure regulator. Pull the vacuum hose off the regulator (that small canister shaped device on the fuel rail) and turn on the key to energize the fuel pump. Watch the vacuum nipple for any sign of fuel seeping from it...??
Are you sure you have fuel pressure. You might put a gauge on the shraeder valve fitting on the fuel rail and check the fuel pressure while cranking.