HEllo ,I am trying to help my grand pa with his car he has a 94 camaroz28 and the car will turn over but not start. He says he can hear the fuel pump make a buzz noise,so he says he thinks it works, but not sure.I was going to buy him a diagnostic tool from kragen, but they told me that the tool only tests sensors.I thought we could plug in the tool into the computer female connector , and get a reading,but they said it wont tell me if i have a bad coil or ignition module. Please help.Thanks a million.

See if your engine has a crank shaft sensor and follow the diag procedure in the service manual to see if it is good. Then check the camshaft sensor which may very likely be the ignition pickup itself. There should be a diag procedure for it too.

The ECM will not turn on the fuel pump and ignition until it sees a couple of pulses from both of these sensors (provided yours has a crankshaft sensor). You'll get the initial 1 second of fuel pump buzz, but it won't do anything beyond that.

I forgot to mention that the engine cranks over but wont start. Thanks for theinfo,im looking up location for crankshaft and camshaft sensor to see if the car has it.Thanks for the help

The problem could be many things. Is there spark? My Wife's '94 had no spark and it was the ignition module.

TTFN
Mat

My Wife's '94 had no spark and it was the ignition module. Mat, that would the same thing as a cramshaft sensor. The difference between it and a typical ignition module is that the module is amplifying the pulse from the pickup and sending it to the computer. The computer sends a pulse back to the module which actually creates the spark. This is how the ECM is able to adjust the timing. If it doesn't get any pulses from the reluctor then the ECM won't send a spark pulse or turn on the fuel pump.

Thank you guys for all your help.We are looking into the ignition module issue. We pulled a plug and checked for spark while grounding the plug we saw no spark, which leads me to the igniton module.I hope. Thanks a million for all your help.

Check the oil pressure sending unit. I know if it does not sense oil pressure, no fuel goes to the injectors; not sure about spark. LOL graemlins/clonk.gif

check to see if ya got spark... 94 Z's have whats called opti-spark which kinda famous for crapin out... if ya got a service manual see what it says about diagnosing it...