Have 1999 chevy cavalier and will not start no spark new ing modular crank sensor cam sensor and still will not start

What about your ignition module? I can't tell if you just replaced coils or ignition module included? Also, before buying anything, check voltage and ground for ignition module. Pink wire is voltage, black wire is ground.

The crank sensor sends ac signal to ignition module, the module converts signal to dc, something the computer can handle, then sends rpm signal to computer.

run the fault codes and check for cam/crank sensors. check operation of immobiliser. check fob key battery
check for ING fuse or fusible link near battery

thats corret replace crank postion sensor and cam postion senosr as they both cause hard start and no start situations the cam sensor is very easy to change crank sensor needs to have harmonic balancer pulluy removed and then remove sensor and reinstall new sensor easy but you need a removal tool and install tool for that pully can be rented at autozone its free its just a depostit i hope it helps


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I would say it may be the cam sensor. Test the wires to the sensor while cranking and see if it is getting power. You can always try unpluging it and cranking. It may start for you. It could also be your ecm. The computer controls all of your ignitions.

What this sounds like is that you need a new ECU. I would recommend picking one up at a junk yard as that will save you some money.

does it produce fire does the gas pressure rise does the crank sensor and cam sensor work

The Crankshaft Position Sensor and the Ignition Control Module also control the spark. It depends on whether your vehicle is equipped with the 2.2L engine or the 2.4L engine as to where these components are located and what they look like.

Sounds like cam belt has snapped. If it broke while starting, could be cheap fix...new belt. Worst case: cylinder head off for overhaul...bent valves / pistons replaced.

Have you had the Starter Checked out?

check the crank sensor. no signal from the crank sensor causes a no spark condition. best way to check is to put a scanner on and check for rpms.
the crank sensor is differnt from the cam sensor