Having problems with your BMW X7 Series ?

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

Posted / edited by AnonymousUser on : 22-01-2018

Answers :

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
Several parts at \015\012this symptom, on the same engine. Manifold Pressure Valve, Fuel Pump, \015\012Fuel Filter and Crankshaft sensor.

An diagnostic tip: remove the \015\012vacuum hose that connects to the regulator and if you notice trace of \015\012fuel in the lines, than replace the regulator. I would not have replaced\015\012 the regulator had it not been for this diagnostic method. So possibly also check \015\012valve or injectors and injector seals.

Hot starting problems can also be caused by cooling problems\015\012that allow your engine to run too hot (the pistons swell up and\015\012may scuff the cylinder walls), or excessive resistance in the\015\012starter motor that causes the engine to crank slowly. A starter\015\012"amp draw" test can be used to check the condition of\015\012your starter. Also, many starters have small "heat shields"\015\012to protect them from heat radiating from nearby exhaust pipes\015\012or manifolds. If the shield is missing, the starter may get too\015\012hot and bind up.

Hope helps.
Repair Help & Product Troubleshooting for BMW X7 Series

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