already did a search, couldn't find what I need.

First off, it's an L98 with a zz4 cam, stock fuel pressure regulator and LT1 injectors ( 24#) . Noticed the drivers side header glowing red. Not just one primary, but all four. I was tuning the car in the driveway and had the engine running between 1200-1500 rpm. when I saw the red glow. Checked the timing and it was at 8* advance. I kinda ruled out timing, fuel mixture, and the normal causes b/c it was all 4 primary tubes, but only on one bank. Going to check for vaccuum leaks tomorrow. Is there a way that that side of the fuel rail is restricted? :lala:

 

Have you checked for voltage supply to the injectors? I would see to much of a possiblity for just one side to be clogged, but it has happend before. Since it is the one bank, it sounds like it would be the wiring harness for the 1-3-5-7 injectors. After you check for vaccum, let us know what you find.

 

glowing headers means you are running too rich and the excess fuel in bringing in the primeries.... which sounds about right running 24# injectors on a computer that thinks it has 22s... dont know why only one side tho??

 

what is the possibility of it running too rich and fuel burning in the primaries? This happens to be the side with the cold start injector. Could it be stuck open and adding extra fuel?

 

Running slightly retarded ignition will also cause your exhaust gas temps to sky rocket. What happens is the fuel doesn't get burned in the chamber but instead finds itself burning in the exhaust port. Running too rich does this too. It's amazing what kind of damage you can do without proper tuning. Personally I've always had mechanical issues and without the eprom tuning around such issues I'm SURE I would be doing a rebuild right now.
It's odd that only one bank is doing this. I'd also check the cats if it's dual or the y-pipe. Make certain that isn't your problem before you go digging into the messy side of things.

 

I had that problem after I installed my 350.. turned out to be the timing was way off. .

 

my ignition timing is set at 8* advance right now. Too much?

 

My car does this too. It happens almost instantly when you are setting the timing. If you are setting the timing correctly by disconnecting the wire that comes out of the harness by the A/C there is no advance, and this severly retarded timing causes the exhaust temps to skyrocket. Unfortunately, there is no way around it, so set your timing quickly, shut it off, reconnect the advance wire, and clear the code. By the way, both headers glow, but the left side glows more, I have no idea why. They'll cool off pretty quick once the advance is back in there.

 

the EST wire has been plugged in the whole time, except for when I set the timing initially. That was last week though.

 

If I understand you correctly, with the EST wire plugged in, you're only reading 8 degrees with your timing light? I know my scanner usually shows about 20 degrees advance at idle(it's always changing a few degrees either way), but that gives something in the mid twenties when you add the six degrees base timing at idle. If you're only showing 8 degrees at idle it seems like you have basicly no advance since I'm showing up in the mid twenties. That will certainly make the headers glow.

 

unplug the est wire, set the timing to 6-8 degrees, then plug the wire back in? Then the timing at idle will be advanced to around 20 degrees?

 

if the cold start injector was struck, it wouldnt make only one side glow.... the gas from the cold start injector goes up into the upper manifold and gets "evenly" distributed

 

NastyL98: yes, as long as you clear the code that disconnecting the EST wire will set. If you disconnect the EST wire, set your timing at 6-8 degrees, and reconnect the wire there will still be NO advance until you clear the code with a scanner or by unplugging the battery. Then restart the car and you should see more than 6-8 degrees at the same rpm you set your timing at, hopefully somewhere around 1000 rpms. If you rev the engine lightly, you should get more advance. Hope it works for you!

 

Understood. Thank you very much, I will go give it a shot after work tonight.

 

You're welcome and let us know what happens.

 

Yeppirs, was just going to mention that.

Tony, what are you using as far as a prom goes??

 

if his car is a 90 (in his sig) he shouldnt have a cold start injector

 

Yeah, but his car was originally an LO3.

 

Yeppers. It used to be an L03 car, put in an '88 L98
BTW Eric, I've still got the stock prom in there. Need to get a custom one burned somewhere.....

 

ok, i thought i missed something

 

...and it runs, eh? My car ran like crapola with 24's on a stock prom. EW.

 

It runs ok. It's driveable. Doesn't like to idle too well though.