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Why won't the engine start if it fires up n rolls over

Tiny
TRAVETTE91
  • MEMBER
  • 1997 CHEVROLET CAVALIER
1997 cavalier fires up but won't start, it only starts when fuel is thrown in the throttle body. Car turns over good. Fuel regulator changed and fuel pump and fuel filter, wires checked and good fuel pump got primed up. Still nothing injectors are working.
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Thursday, June 14th, 2012 AT 4:40 PM

19 Replies

Tiny
SATURNTECH9
  • MECHANIC
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What is the exact fuel pressure?Also you checked the injectors for pluse with a noid light?
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Thursday, June 14th, 2012 AT 4:57 PM
Tiny
TRAVETTE91
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The fuel pressure is normal I placed a new fuel pressure regulator in the car and the pulse was checked all injectors are working
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Thursday, June 14th, 2012 AT 5:42 PM
Tiny
SATURNTECH9
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That makes no sense if you have good fuel pressure which is how much psi?Also the injectors are pulsing but wont start?But will start when spraying carb spray in the throttle body?
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Thursday, June 14th, 2012 AT 6:07 PM
Tiny
TRAVETTE91
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41-45 psi probably over looked one of the injectors? Cud it be a crank sensor problem?
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Thursday, June 14th, 2012 AT 6:30 PM
Tiny
SATURNTECH9
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If it was a crank sensor issue you wouldnt have spark and it wouldnt start even with carb spray.
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Thursday, June 14th, 2012 AT 6:41 PM
Tiny
TRAVETTE91
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So more than likely it's probably the injectors the pressure is good
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Thursday, June 14th, 2012 AT 6:42 PM
Tiny
TRAVETTE91
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  • 9 POSTS
Could it Also be the PCM?
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Thursday, June 14th, 2012 AT 6:43 PM
Tiny
SATURNTECH9
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So all the injectors are pulsing?You did check it with a noid light each harness and the pulses while cranking?Also what lead up to the no start?
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Thursday, June 14th, 2012 AT 6:49 PM
Tiny
TRAVETTE91
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  • 9 POSTS
I checked um wrong then will re-check. Firstly the car was runnin on 3 cyclinders which cause the catalytic converter to clogged. Changed the ignition coil pack and changed the fuel pressure regulator cause car was runnin rich in gas. It would stall and cut off n start right back up so I changed the fuel pump yesterday into a new one along with the fuel filter. Originally when cranked I couldn't hear the fuel pump cut on that's why I assumed it went. Car would take long to strt in the m
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Thursday, June 14th, 2012 AT 6:54 PM
Tiny
TRAVETTE91
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Checked the fuses and wiring with test light
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Thursday, June 14th, 2012 AT 6:56 PM
Tiny
SATURNTECH9
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So you didnt use a noid light and you dont know if there pulsing?
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Thursday, June 14th, 2012 AT 7:07 PM
Tiny
TRAVETTE91
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No I didnt, where can I find a noid light srry my dad told me they checked um but he didn't checked the actual pulse
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Thursday, June 14th, 2012 AT 7:10 PM
Tiny
CADIEMAN
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Did u check the injecter fuse for voltage and injecter for pulse.
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Thursday, June 14th, 2012 AT 7:10 PM
Tiny
TRAVETTE91
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We checked the injector fuse but not the pulse
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Thursday, June 14th, 2012 AT 7:12 PM
Tiny
CADIEMAN
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What about voltage at the fuse
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Thursday, June 14th, 2012 AT 7:32 PM
Tiny
TRAVETTE91
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No haven't checked that, is there a way to check it without the noid light, the people who own auto stores over here are retards they don't know what noid lights are
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Thursday, June 14th, 2012 AT 7:45 PM
Tiny
CADIEMAN
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All u need is a reg. Test light with a bulb they are cheap. If u dont know what it looks like goggle it.
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Thursday, June 14th, 2012 AT 8:03 PM
Tiny
SATURNTECH9
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I would use a computer safe test light if your going to test it with a test light. One side of the connector will have power key on engine off. The other side will be a pulsing ground while cranking. If you get a computer safe test light with two aligator clips one for power and one for ground it will tell you if you have power or ground and wont have to swap the aligator clip from power to ground when checking for power and the ground pulse.
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Thursday, June 14th, 2012 AT 8:15 PM
Tiny
CADIEMAN
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Just buy a dam test light and ck. For voltage at the fuse. Then youll have to do what saturntech9 said. All im trying to find out if voltage at a fuse im done ty for using 2car pros
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Friday, June 15th, 2012 AT 4:56 PM

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