1999 Dodge Neon

Tiny
IRMAINTENANCE
  • MEMBER
  • 1999 DODGE NEON
Electrical problem
1999 Dodge Neon 4 cyl Front Wheel Drive Automatic

I REPLACED THE HEAD GASKET THREE WEEKS AGO. SINCE I PUT IT BACK TOGETHER 2 INJECTORS DON'T WORK, I REPLACED THEM THINKING THEY WERE BAD, BUT THEY STILL DON'T WORK. I THOUGHT THEY GOT THERE SIGNAL FROM THE PCM? OR DO THEY GET A SEPRATE SIGNAL FROM THE CRANK OR CAM SENSOR? THANKS, IVAN FAVREAU
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Thursday, April 23rd, 2009 AT 11:34 AM

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Tiny
CARADIODOC
  • EXPERT
So what's the symptoms? If the engine doesn't start, did you check for spark or just get hung up on the injector issue?

If the timing belt is off by one tooth, the "Check Engine" light will be on. If it's off by two teeth, the computer will shut the engine down by turning off the Automatic Shutdown relay. The ASD relay feeds battery voltage to the coils, injectors, and fuel pump or pump relay. If the belt is off by three teeth, the pistons will hit the valves.

If the timing belt is installed correctly, and the engine still doesn't start, remove the camshaft sprocket and inspect the dowel pin. When they break, the camshaft slips a little on the sprocket. Even though the sprocket is in time, the cam, and the cam sensor on the other end of the cam, are both late, just as if the timing belt was off. The common symptom of this problem is a spark every now and then and only the two center injectors fire intermittently.

Caradiodoc
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Friday, April 24th, 2009 AT 12:53 AM
Tiny
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My 1999 neon will start, but it only run on 2 cylinders. I have checked the fuel psi, the spark is good, and the compression is good on all 4. I have been doing this sort of thing since I was ten, this one tells me that it is the pcm, but before I get one I was looking for a second opinion. I have double checked the timming. But if it was off, like you said the autoshut off relay would be tripped. It runs good even though it is only running on 2cyl. Thanks ivan
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Friday, April 24th, 2009 AT 7:07 AM
Tiny
CARADIODOC
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There are protection circuits built into the pcm that turn off the drivers to prevent overloading them from excessive current. I've never run into two dead injectors at once, but you might try unplugging one dead injector to see if the other one will come to life. I don't think you have to stop the engine and restart it.

Caradiodoc
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Friday, April 24th, 2009 AT 12:12 PM

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