No Start Situation - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

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post #1 of 2 (permalink) Old Sep 15th, 02, 03:23 AM Thread Starter
Join Date: Sep 2001
Location: Canada
Posts: 13
My wifes's 88 Pontiac Tempest won't start. No spark and no gas getting to plugs. Also no computer codes stored. Any Ideas?

Thanks in advance
try'in hard is offline  
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post #2 of 2 (permalink) Old Sep 15th, 02, 06:20 AM
Senior Tech
Join Date: Mar 2002
Location: Austin, TX, USA
Posts: 5,277
<BLOCKQUOTE>quote:</font><HR>Originally posted by try'in hard:
My wifes's 88 Pontiac Tempest won't start. No spark and no gas getting to plugs. Also no computer codes stored. Any Ideas?

Thanks in advance

I don't know about your particular car, but here is a general problem that affects numerous vehicles. Some cars in the mid to late 80s started to use a crank-shaft and or cam-shaft position sensors. When you first turned the key, the fuel pump would run for a second to bring the fuel rails up to pressure then shut off. When you turned the key, the ECM would wait for pulses back from the position sensor(s) before energizing the ignition and turning the fuel pump / injectors on.

I saw this problem on my neighbor's jeep a few weeks ago. When he first turned the key on, we would hear a short buzz from the fuel pump as expected, but the fuel pump would not come on when the vehicle was cranked. We first though the fuel pump was bad. We then shorted the fuel pump relay to force it to run. When we cranked again, still it would not start. There was no spark from the ignition.

We dug out the service manual (chiltons) and looked for the position sensor diag procedure. The crank shaft sensor was shorted. There was one thing that the procedure didn't tell us. Both the crank and cam sensors were powered from the same computer circuit. Both sensors tested bad according to the procedure. We then disconnected one while testing the other and found the shorted crank sensor.

Hope that helps. Good luck.


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