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viking4041 2/23/2011
1997 Oldsmobile Regency Base 6 Cyl 3.8L - Engine
why does my car have trouble starting in the morning
77,435 miles. Replaced fuel relay switch,egr valve, cold air coolant sensor, tune-up, fuel injectors cleaned. When the vehicle is cold it will crank but not start. While cranking it runs the battery down. Some times while trying to start the engine will back fire. Sometimes the vehicle would start in the morning and no problems the rest of the day. But the problem would happen again.
2 Answers
    have you fuel system pressure tested also you mention it backfire :
    misfiring cylinder possibly due to fouled spark plug, ignition timing incorrect (leads swapped around). The reason for the backfire is unburnt fuel accumulates in the very hot exhaust system and ignites there
  • HouseCallAuto
    HouseCallAuto 2/23/2011
    Cracked upper intake manifolds are very common on this engine. This situation can also give you the backfire you mentioned. The reason is that some of the cylinders are getting coolant in them while the car is parked. It would depend on the size of the crack / opening as to whether you will have either a no start or a hard start cold. This theory can be verified by a good mechanic checking the car and mention about checking the upper intake manifold for a coolant breach by the EGR tube. There CAN be other causes for a no start when cold. Verify fuel pressure is at specification. check the fuel pressure regulator for leakage into the vacuum hose. And of course, check for any fault codes that might have set.

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