V6Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.
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I bought a 91 firebird with a fuel injected 3.1L in it. The car had been sitting for about a year. The car starts up for about 3-4 sec. then dies the idle is rough for those few sec's. I have replaced the fuel pump, fuel filter, MAP sensor, drained and changed the fuel, checked the fuel pressure it is at about 43, and it isnt throwing any codes. If you spray starter fluid in the intake it will stay running, but take it away and it dies. Any help on this would be greatly appreciated.
Inlet screens on the injectors are probably clogged with gummed fuel. I'd also change the plugs and wires and make sure no mice or anything chewed on the wiring.
Definitely sound like injectors. I have a set of 6 injectors that I tested with my ohm scale and came back good. One of the 6 is brand new (with receipt) 3 of them are original GM. If interested email me I'm getting rid of them CHEAP. yeargin@live.com. Most likely you will have only one or two that need replacing but worth while getting a whole set and keeping some spares.
Definitely sound like injectors. I have a set of 6 injectors that I tested with my ohm scale and came back good. One of the 6 is brand new (with receipt) 3 of them are original GM. If interested email me I'm getting rid of them CHEAP. yeargin@live.com. Most likely you will have only one or two that need replacing but worth while getting a whole set and keeping some spares.
How cheap? I just bought a set a couple of months ago with a rail that 5 out of the set seem to either be clogged or just FUBARed.
I have a similar problem but mine starts up fine and runs great, but when it warms up and i turn it off it wont start again.. it has a brand new fuel pump and filter, plug wires, distributor, rotor button, ignition coil, IAC vavle, and TPS, i had the ignition module tested at two different stores and both said its good, and now im out of ideas
I bought a 91 firebird with a fuel injected 3.1L in it. The car had been sitting for about a year. The car starts up for about 3-4 sec. then dies the idle is rough for those few sec's. I have replaced the fuel pump, fuel filter, MAP sensor, drained and changed the fuel, checked the fuel pressure it is at about 43, and it isnt throwing any codes. If you spray starter fluid in the intake it will stay running, but take it away and it dies. Any help on this would be greatly appreciated.
91's don't have a MAF sensor. I'm thinking some sort of vacuum leak. Either that, or, like I said above, the fuel injectors are gummed up and it's running VERY lean (which is BAD for the engine, BTW).
:edit: Now that I read through the other thread in the link above, it is possible that the pickup coil (yes, that is what it's called, and yes, it is a Hall-effect sensor) is going bad. These things are in excess of 15 years old now, and things do wear out. I think I'm going to have to do mine as well.
Reminds me of a saying there is in my missing Automotive Electrical and Electronics Systems textbook, and what a senior GM tech told me about 5 years ago: "No spark, no squirt. If you have no fuel delivery, check to see if you have spark."
Keep in mind that the ignition module is just a go-between for the ECM, the ignition coil, and the pickup coil. If the pickup coil is bad, the ignition module may seem to be bad because the ECM isn't receiving a reference pulse (which is why one of the steps in the "No Spark" flowchart is to check the signal from the PU coil). If the wire between the ignition coil and the dizzy is bad, the module won't receive power.
Next time the engine has this trouble, check to see if you have spark as well. If the PU coil is bad, you have 2 choices: Remove the dizzy and spend a day rebuilding it and replace the coil for $15, or replace the entire thing for $250.
__________________ Dan V.
Project Raven is on hold... She's a body shell with a rather large collection of parts. 1987 Pontiac Firebird, T-top, 1991 VIN T engine, getting MegaSquirted. 85 T-5 5-Speed manual trans. Hybrid 3100 V6 swap nearly complete, too much body work to do first . Restomod in progress. So many parts to replace, so little money .
Last edited by Maverick H1L; 10-02-2009 at 07:07 AM.
The car starts up for about 3-4 sec. then dies the idle is rough for those few sec's. If you spray starter fluid in the intake it will stay running, but take it away and it dies....
. Restomod in progress. So many parts to replace, so little money 
