TX-SleeperC5

iTrader: (2)

As the title says. Got everything put together last night. Turns out I was a little off on the distributor setting. I backed all the plug wires up 1 position counter clock wise and she wants to fire but won't stay running. It backfires through the throttle body.

Am I still off on the timing / distributor set ?
Do I need to reset the #1 piston the firing position and re-drop the distributor ?

Trying to get this thing fired up today so I can get it to the exhaust shop tomorrow.

Any and all help would be greatly appreciated !

antares57

iTrader: (8)

Check this out and see if it applies.

https://www.thirdgen.org/forums/tech...tbi-after.html

NCC-2569

iTrader: (1)

So your engine was apart?
Have you installed the distributor the correct way around?
I've heard of people installing it 180° reversed and producing these symptoms.

TX-SleeperC5

iTrader: (2)

doesn't help... I put the #1 cylinder at firing position and the dist is pointing pretty darn close the firing position. I'm at a loss here.

TX-SleeperC5

iTrader: (2)

Correct, the motor was out for a complete rebuild. Not sure what you mean by "the correct way around". The distributor itself is installed correctly from what I remember. I'm thinking I may be a tooth or something.....

TX-SleeperC5

iTrader: (2)

Probably due to the car not staying on or the distributor being off but I just pulled the #1 and #3 plugs and they're soaked in gas....

TX-SleeperC5

iTrader: (2)

Set the engine to TDC, reset the distributor and I get the same thing.... Snort, cough, spit and it wont stay on !! This thing is driving me crazy !! I've NEVER had this much trouble starting a new engine !

Barlow8869

iTrader: (1)

did you plug the injector wires onto the wrong bank by chance?

OrangeBird

iTrader: (1)

Right , TDC of #1 .....

BUT !!!

There are TWO (2) TDCs in each firing event . Are you timing it on TDC of the COMPRESSION stroke , or TDC of the EXHAUST stroke ?

Cause only if it's timed to TDC of the compression stroke will it start .......

TX-SleeperC5

iTrader: (2)

Nope.... injector harness is pretty much set as to which one is right and which one is left...

TX-SleeperC5

iTrader: (2)

Yes. Pulled the #1 plug, put my finger in the hole and had my son bump the motor over until air is being pushed out of the cylinder.

NCC-2569

iTrader: (1)

I meant the distributor being installed with the sockets facing to the engine front instead of the firewall, for example.
That would be a 180° turn and cause all sorts of stuff.

TX-SleeperC5

iTrader: (2)

At the moment the distributor is installed with the electrical connections facing in the 2 o'clock position. Which more or less where they were when we disassembled the motor.

TX-SleeperC5

iTrader: (2)

On another note, and this is odd.... when the #1 valve were adjusted to have some of the lash removed, we cranked over the motor to find TDC and I was getting NO compression (air pushing out of the cylinder) what so ever !

Anyone have an idea or answer for that ??

ploegi

Adjust the valves too tight?

TX-SleeperC5

iTrader: (2)

Could be right... I loosened them up and seems to be okay.

TX-SleeperC5

iTrader: (2)

Any other ideas as to why she's not firing up and staying on ??
I'm still thinking its a timing issue but just can't wrap my head around it. Can't figure out where I went wrong....

91 rally sport

iTrader: (2)

a bad icm will make them pop. also u may want to invest in new lock nets for the rocker arms had the same problem with my 91 tbi

TX-SleeperC5

iTrader: (2)

ICM ??

Barlow8869

iTrader: (1)

icm - ignition control module

91 rally sport

iTrader: (2)

It the thing under dist cap it has two plug openings on it

TX-SleeperC5

iTrader: (2)

I may just have to drop this thing off at my local Chevy dealership with a friend of mine.....

TX-SleeperC5

iTrader: (2)

Okay so here's the latest update........

Got most of the problems figured out, timing, valve lash and so forth.
Now I can get the car to start, run and idle under throttle.. but she still won't stay on under her own power.

Do I have to have the computer retuned ?
Only difference from stock is a set of headers and an LT4 hot cam with 1.5 roller rockers.

And suggestions, comments ?

TX-SleeperC5

iTrader: (2)

no one huh...... wow.....

91 rally sport

iTrader: (2)

Maybe a vacuum leak somewhere. Do u hear a hissing noise at idle?

TX-SleeperC5

iTrader: (2)

been running the car open header. Will get the car back tomorrow and we'll see where we go from there. found someone locally that my have to re-tune the computer to the new cam.

TX-SleeperC5

iTrader: (2)

SHE LIVES !!!!!!!!!!!!!!!
Looks like we got her all sorted out !!
I'm thinking I may have to buy a computer chip if we can't get the car to idle on its own.

Any of you guys have any chip recommendations ??

Oh and this cam sounds SWEET !!