cranks but wont start

**Gboy** · 09-24-2015

Got 99 Grand prix cranks but wont start. checked ignition spark at the ignition modules or whatever they are called. Got spark from all six wire plugs, am assuming that means crank sensor good? since getting spark. Check fuel pressure 45-50 psi when cranking. Checked compression all around 150. Replaced pcv valve and pressure sensor on top of it. Sounds like it backfires when cranking over at times. Any suggestion on what going on. checked codes not throwing anything to reader.

**Scottydoggs** · 09-24-2015

ever do a tune up? has it been slowly taking a crap on ya? or was it perfect yesterday and dead today?

**Gboy** · 09-24-2015

Took crap starting to wonder if upper intake
Is leaking just not enough to hydro lock.

**Bronco Boy** · 09-25-2015

Originally Posted by Gboy

Took crap starting to wonder if upper intake
Is leaking just not enough to hydro lock.

If hydrolocked, there would be no crank.

**Gboy** · 09-25-2015

That's why I said not enough to hydrolock

**Scottydoggs** · 09-25-2015

pull the plugs, see if they are wet with coolant.

**Bronco Boy** · 09-25-2015

Originally Posted by Gboy

That's why I said not enough to hydrolock

My bad. Apparently I didn't read the "not" part. Carry on. LOL

**ericspecullaas** · 09-25-2015

your plugs are wet either from coolant or fuel. also whats the compression like? what were the last 5 things done to the engine?

**BillBoost37** · 09-26-2015

If you pull the TB 3 10mm. Look right in and see if it's soaked

**Gboy** · 10-06-2015

Ok found coolant in intake so replaced upper and lower intake gaskets. Do I need to replace plugs they aren't that old? Did notice some of plugs were loose. Don't know if it was from extra pressure in cylinders when motor was still running and trying to hydrolock. Still can't get it to start. Everything else looks good. Haven't checked timing yet.