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1996 Plymouth Neon WON'T START

Tiny
KRAHEL
  • MEMBER
  • 1996 PLYMOUTH NEON
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 120,000 MILES
I GET SPARK WHEN YOUM FIRST CRANK IT THEN IT GOES AWAY.I PUT A NEW CRANK SENSOR, CAM SENSOR, IGNITION SWITCH, WIRING HARNESS, PCM, COIL PACK, ON IT. FUEL PRESSURE IS 42 PSI. ALSO NEW SPARKPLUGS AND WIRES.
Wednesday, July 28th, 2010 AT 6:05 PM

8 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi KRAHEL, Welcome to 2carpros and TY for the donation

Inspect and test the ASD relay and the coil pack driver circuits back to the PCM.
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Wednesday, July 28th, 2010 AT 7:00 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Disconnect the wiring connector from the computer and the coil pack- check the wiring for an open or shorted wire if okay replace the computer
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Wednesday, July 28th, 2010 AT 7:24 PM
Tiny
KRAHEL
  • MEMBER
  • 4 POSTS
I DID PUT A NEW COMPUTER AND WIRING HARNESS ON. STILL THE SAME PROBLEM.I ALSO FORGOT TO TELL YOU THE COMPREESSION WAS IN SPECS.
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Wednesday, July 28th, 2010 AT 7:42 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Your fuel pressure should be 48psi yours is on the shy side-also check the available voltage on the coils
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Wednesday, July 28th, 2010 AT 9:32 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
Hi guys. Check for a sheared off dowel pin between the camshaft and its sprocket if this is a single cam engine.

Caradiodoc
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Thursday, July 29th, 2010 AT 1:37 AM
Tiny
KRAHEL
  • MEMBER
  • 4 POSTS
I AM GETTING VOLTAGE TO THE COILS, AND THE CAMSHAFT IS TURNING WHEN YOU CRANK THE ENGINE. THIS HAPPENED AFTER AFTER I PUT A NEW TIMING BELT ON IT. IT RAN FOR A LITTLE BIT THEN THIS HAPPENED.
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Thursday, July 29th, 2010 AT 10:24 PM
Tiny
KRAHEL
  • MEMBER
  • 4 POSTS
THE ONLY THING I DON'T KNOW ABOUT IS THE PRIMARY IGNITION IF THIS COULD BE A PROBLEM. ALSO HOW TO CHECK IT. THANK'S
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Thursday, July 29th, 2010 AT 10:28 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
Turning isn't the issue. It is real common for the dowel pin to shear and over time, the sprocket turns slightly on the camshaft. Since the camshaft position sensor is on the other end of the cam and not by the sprocket, the Engine Computer detects that as though the belt has jumped a tooth. At one tooth mismatch, the computer turns on the Check Engine light and sets a fault code for "cam and crank out of sync". At two teeth off, the computer shuts the engine down to protect it. At three teeth off, open valves will hit the pistons. This only applies to the single cam engine. I've never heard of it happening to the DOHC engine.

Caradiodoc
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Friday, July 30th, 2010 AT 1:15 AM

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