97 grand prix won't start

**HazeGP06** · 01-09-2013

Alright I've got a head scratcher here. A 97 grandprix gt was moved one morning and in the middle of the move died and would not start back up. I have good fuel pressure and injector pulse, both cam and crank sensors check out, a bunch of O2 codes, atleast half a tank of fuel, new plugs and wires, ICM and coils are good, no broken grounds all are clean, new battery and good alternator, and good compression in all 6 cylinders. When I crank the engine over it'll stumble a bit like it want's to start once in a while. If I cover the MAF/TB opening it seems to damn near run but just won't. I'm at a loss and any help would be greatly appreciated.

**blueguy** · 01-09-2013

Vacuum leak?

Bad MAF?

Unplug the MAF, try that.

**BillBoost37** · 01-09-2013

Agreed, try the maf first.

**HazeGP06** · 01-09-2013

Tried that to guys..

**blueguy** · 01-09-2013

Sprayed carb cleaner for a vac leak too?

**HazeGP06** · 01-09-2013

yes I did

**HazeGP06** · 01-09-2013

thinking maybe upper intake the brake booster connector is kinda loose but not broken anywhere

**blueguy** · 01-09-2013

Still sounds like a vac leak is killing it...and a big one.

Warped UIM/bad LIM gaskets?

**HazeGP06** · 01-09-2013

That's what I'm down to

**CTKGP09** · 01-09-2013

what are the o2 codes?

**blueguy** · 01-09-2013

If you haven't done those, I'd get a scanner than can read live fuel trims and swap those out.

**HazeGP06** · 01-09-2013

they were for the heater circuits mostly

**HazeGP06** · 01-09-2013

and slow response

**HazeGP06** · 01-09-2013

according to the owner the engine light was on for a while now

**CTKGP09** · 01-09-2013

might need to disconnect the battery and let it sit overnight to reset the PCM

**HazeGP06** · 01-09-2013

as far as the fuel trims go, doesn't the vehicle have to run to acurately see those?

**HazeGP06** · 01-09-2013

That has also been done. The first time I looked at the car the battery was unhooked all night.

**BillBoost37** · 01-09-2013

LOL, yes.

Take a look at the fuses. If the heater circuits are all dead, you likely have a dead fuse that is keeping something from working or getting power.

**HazeGP06** · 01-09-2013

Forgot to add that to the original post, but yes all fuses are good. That's why I'm at a loss. I've tried everything short of UIM/LIM.

**BillBoost37** · 01-09-2013

Pull an O2 connector apart and check for power and ground. IIRC you should have power at pink and purple. There's definately two powers in that connector. If you don't see one, I'm thinking something ...somewhere isn't giving you power.

Try this.. Pull out a plug, is it wet with fuel?