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Stumbling/hot no-start problem. When '88 735i gets warm it won't start until engine cools down(20-25 minutes?) Engine turns over but wont run, it acts like the timing is off(piffs and sputters and acts like its flooded?) After it cools down, it'll start but runs rough like it's got a couple fouled plugs!? Any ideas? I need some help PLEASE!!!! Thank You, Scott

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  • Scott Tonne
    Scott Tonne Jun 01, 2010

    The car is not driven much and has been running fine until the last 2 times.

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Hello Scott. Begin by changing all of the plugs, and the fuel filter. Regarding the fact that it won't start when hot, look in the yellow pages under autoelectric shops. These shops have the diagnostic tools to check out your car's systems to see what is going on differently when hot, compared to when cold, to get to the bottom of your troubles. Joe

Posted on Jun 01, 2010

  • Scott Tonne
    Scott Tonne Jun 01, 2010

    DuuuuH!!!!!!!!! Expert my ***!!!!! I need someone that's had the same problem with their 735i, and how they fixed the problem!?

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Several parts at this symptom, on the same engine. Manifold Pressure Valve, Fuel Pump, Fuel Filter and Crankshaft sensor.

An diagnostic tip: remove the vacuum hose that connects to the regulator and if you notice trace of fuel in the lines, than replace the regulator. I would not have replaced the regulator had it not been for this diagnostic method. So possibly also check valve or injectors and injector seals.

Hot starting problems can also be caused by cooling problems that allow your engine to run too hot (the pistons swell up and may scuff the cylinder walls), or excessive resistance in the starter motor that causes the engine to crank slowly. A starter "amp draw" test can be used to check the condition of your starter. Also, many starters have small "heat shields" to protect them from heat radiating from nearby exhaust pipes or manifolds. If the shield is missing, the starter may get too hot and bind up.

Hope helps.

Posted on Jun 01, 2010

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