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repost with codes and you will recieve the help you want... the systems monitered by the light are all directly related to a running engine. turning over slowly could be battery or starter (cold weather does affect battery charges).
Pinion gear solenoid is damaged on the starter/ not disengaging when key returns to RUN position,
OR YOUR STEERING WHEEL KEY SWITCH IS DAMAGED AND THE CONTACTS FOR THE START POSITION ARE DAMAGED AND SHORTING IN THE start position.
OR the starter solenoid in the engine compartment not on the starter. (see botton re:contractors truck)__
Could be dry metal and burring ie freezing up stuck . a product called ACS 50 or corrosion block by lear inc. is great for all electrical components. lightly spray in the key hole then gently turn key in all directions to lube it up. this may fix the glitch if it's in the key switch assy.. if not check the starter by disconnecting wires "as you need to to r and r it. but hot wire it by jumping the contacts for the START Mode. if it spins and stops when you unHotwire it when engine running, it looks like KEY SWITCH problem. BEFORE RIPPING INTO STEERING ASSY TAKE THE STARTER OFF AND TAKE IT TO THE PARTS STORE TO TEST IT. Its the lesser of two dismantles. these are events I have experienced dozen years ago and this year on a contractors truck. He had to go under the hood to jump the starter solenoid I ACS'd key asy and it resolved his problem.. so its a start to debug and resolve. can't think of another at this time. good luck. greg
I had this exact symptom on my 1984 533i. I spent months diagnosing everything but the computer. It was the computer that failed. Actually only part of the circuitry failed and is probably repairable. When the car is cranking it would run. I set up a wire harness that allowed me to shut off the starter motor while I was holding the key in the starter motor position. The car ran just fine. The 533, 633 and 733 all use the computer ending with 008. DO NOT slap in any other computer unless you actually know what you are doing. I tried. And you risk damaging good components, like the donor computer and the injectors.
your starter,solenoid or ignition is no good. but my first choice,i think your solenoid is shorted because when you hook up the battery,it cranks but does not start.that means your ignition switch is still working.
the starter should be replaced. The solenoid is kikcing the pinion out but there is no contact being made to turn the starter motor. I have the exact same truck and before i changed the starter used the old starter tap trick. Tap the starter casing with a hammer and it should start turning again. hope this was helpful for you. Good luck.
My bet is that you have an open the fuel pump run circuit or the vacuum switch. Most GMs have a vacuum switch to 'see' the engine running and reduce pressure by cutting voltage. However, if your car has a turbo or supercharger, they use a relay that 'flips' to a resistive line which then cuts the power level to the pump. Get a good model-specific diagram and check it out.