Nklobe

Hi everyone!
This is my first post but i have been lurking on these boards for some time now and thanks for all the help already!

But now im stumped!
I have a 91 V6 3.1l that wont start!
Before i explain how it behaves i will list the things i have checked and/or changed

Battery: new
MAP sensor : new
Injectors: new
Spark plugs: new
Sparkplug wires: new
Rotor: new
Distributor: new
Fuel-filter: new
All fuses: changed
cleaned all the ground-points i could find
MotorOil: new
EGR: new
IAC: new
FIlled with new gas

I bought a ALDL-reader so if you need som info from that just ask for it!

I noticed yesterday that there was petrol in the motor oil so i changed it. I read that if you crank with petrol in the cylinders that can happen...

I got the engine to run a week ago when i changed all the sparkplugs. Is it possible that i wrecked the new sparkplugs already?

Last summer i had problems with the car just dying so i took the injectors out and realized three of them were bad so i changed all 6 just to be sure.

OK! Now for the weird behavior!
I can crank no problem but the engine does not start, it just sporadicly putts as if only one cylinder works.
This seems to be completely random the only time i know it will putt is if i wait for a few minutes and try to start it, at that time it putts 1 to 2 times then just cranks...
I tried to start it with starter spray but that backfired (literary...)
I took the spark plugs out and one of them was dry sooty, the other ones where sooty and wet with what smelled like petrol.

I have done other stuff but i cant remember them now...

Thanks for all the help, past and future!

Jacobaxeman

Nklobe

Well the security lamp starts and turns off just as it should...

I have the official GM repair handbook and i used that to put the ignition cables in the correct place both in the engine and distribution.

Jacobaxeman

I think it's your key. When I got a my 91 RS it wouldn't start would just crank away. I changed the ignition cylinder & key and it started.

maroe624

Check your firing order and your timing as well. Sounds like a timing issue.

Nklobe

Thanks for the tips!
Is there anyway to check the ignition cylinder?
Can i measure it in some way?

Is there a way to check timing without having the car running but just cranking?
Can i do that with a timing light?

broke91firebird

I agree with maroe624, check your timing. usually(not always) backfires are timing issues. if your timing is correct, Burn the end of a plug clean/ get a new plug and test to see if you get a good strong spark. If not, it could be the coil being bad or the sensor under the rotor on the distributor(cant remember the name).

Tuned Performance

iTrader: (92)

Here’s some vats information Incase you don’t have injector pulse.
https://www.thirdgen.org/VATS/

midias

Triple check the plug wires on the distributor. Reminds me of when I had them all off by one position

Nklobe

I got it running!
Thanks for all the help!
Out of all the things you said the solution was broke91firebird:s tip to "Burn the spark plugs" Ive never heard about that before so i looked it up and did it!
I tried to clean the plugs with different solutions before but that just made it worse i guess...
Ive had problems with the car dying before so i will still check the VATS Thanks for the tip Jacobaxeman and Tuned Performance