Car keeps cutting out (Not VATS)

**2002 ceta** · 02-18-2015, 04:31 PM

I've done this bypass and it worked great, I've got an 02 trans am , I was driving it home today and it cut off ,pulled over and it just turns over but doesn't fire up. No code is on no check engine light. Thought maybe my resistors came out but its fine, the security light isn't on and if I take it out it doesn't do nothing so I ruled that out. Could this be a crank sensor or can sensor? I'm pulling my hair out here. The car only has 53000 miles on it and very well taking care of, need some help on this

**pajeff02** · 02-18-2015, 05:09 PM

Engine needs fuel, air and spark. Start with the basics -- does it have fuel pressure at the rail?

**2002 ceta** · 02-18-2015, 05:18 PM

Yes plenty of fuel , fuel rail is pressurized ,air is good but no spark, I disconnected the battery to reset the system and the car fired up and ran for a min then cut off, then it just turns over but doesn't fire up, weird .

**pajeff02** · 02-18-2015, 05:30 PM

VATS shouldn't shut the car down after it is running like that. You can undo your bypass and just try it (unless the system was having an issue and you had to bypass it). Any recent work done to the car?

**2002 ceta** · 02-18-2015, 05:36 PM

I had to bypass the vats due to a broken wire on the key cylinder, no work has been done to the car, its bone stock,

**pajeff02** · 02-18-2015, 05:40 PM

A bad sensor will generally trip the SES. I take it you can hear the fuel pump engage when you energize the ignition? You have checked fuses? Swapped relays around for any of the critical engine systems? Eyeballed the underhood wiring and sensor connections?

**2002 ceta** · 02-18-2015, 05:53 PM

Yes I can hear the fuel pump, checked the fuse panel in the car but not the relays or fuse under the hood, checked most of the connection and all seems good, no loose connection or frayed wires. I'll swap around relays tomorrow and get back with u .

**2002 ceta** · 02-19-2015, 02:14 PM

Just got home, turned the key car fired up ran for 2-3 mins shut off now just turns over. So i checked all fuses ,swapped relays and still nothing, so for giggles I plugged in my obdll tester and p0335 comes up , no light is on but code reads, now I called GM and they said that the sensor can or crank wouldn't make it not start just run crappy. Going to pull a plug when wife gets here and c for sure if its not sparking . any thoughts

**2002 ceta** · 02-19-2015, 03:10 PM

No spark , testing it the old way against the block.

**pajeff02** · 02-19-2015, 05:30 PM

Crank sensor is on the passenger side of the block above the starter. If it is throwing a code something isn't happy there. I would have to check my manual to see what the symptoms are -- certainly intermittent by what you are experiencing. Stock manifolds or headers?

**2002 ceta** · 02-19-2015, 05:38 PM

Stock manifolds,

**0rion** · 02-19-2015, 08:29 PM

this needs it's own thread.....not vats related.

**pajeff02** · 02-20-2015, 03:25 AM

Good point.

Ed - wire insulation tends to get melted and things short out around long tubes if things are not properly routed and tied off. That is why I asked... If you are working on the car this weekend, I can grab my books and we can walk through some pinpoint testing perhaps...

**2002 ceta** · 02-20-2015, 03:29 AM

That would be awesome ,I started another thread under crank shaft position sensor. I really appreciate your help.

**pajeff02** · 02-21-2015, 05:02 AM

I'll be out in the garage later and will check in from time to time today if you want to run over some stuff in the service manual as far as pinpoint diagnostics. Is your email address in your profile valid?

**2002 ceta** · 02-21-2015, 05:08 AM

I put the crank shaft sensor in yesterday and and it seem to be running fine, going to drive it around today and hopefully all is well. Thanks for all your help ,I'll keep u posted, and yes its a good email.